The Sinian Dengying Formation gas reservoir in the Anyue gas field of the Sichuan Basin is an ultra-deep ancient dolomite karst gas reservoir,whose development is of high difficulty,for the reservoir is thin and scatt...The Sinian Dengying Formation gas reservoir in the Anyue gas field of the Sichuan Basin is an ultra-deep ancient dolomite karst gas reservoir,whose development is of high difficulty,for the reservoir is thin and scattered with strong heterogeneity and is overall characterized by low porosity and low permeability.In order to provide support for the large-scale productivity construction of the gas reservoir of the fourth member of Dengying Formation(Deng 4 Member)in the marginal platform belt of the Anyue gas field,this paper carries out multi-discipline comprehensive researches on the technical bottlenecks based on the geological characteristics of the gas reservoir.In addition,the targeted key technologies for the efficient development of gas reservoirs were developed in the mode of“simultaneous research,application and improvement”.And the following research results are obtained.First,based on the modeling technology of fracturedevuggy dolomite karst reservoirs,accurate modeling of karst reservoirs is realized.Late actual drilling results show that the model's coincidence rate is increased from 63.0% to 90.7% and the“transparency”of gas reservoirs is achieved.Second,based on the reserve mobility evaluation technology of lowporosity and highly-heterogeneous karst reservoirs,the recovery factors of different reservoirs are determined.And consequently,the lower limit of well-controlled reserves and radius for the efficient development of different reservoirs are obtained and type Ⅰ and Ⅱ reservoirs are selected as the main development targets.Third,based on the development optimization design technology of highly-heterogeneous karst gas reservoirs,it is recommended to apply highly-deviated wells(the maximum deviation angle of 75°-84°)in the situations with multiple reservoirs crossed and superimposed.If type Ⅰ and Ⅱ reservoirs are developed intensively,it is recommended to adopt horizontal well drilling with a horizontal section of 800-1100 m.What's more,the reasonable well spacing in type Ⅰ and Ⅱ reservoirs shall be 1.6-3.3 km and 0.9-1.4 km,respectively.Fourth,based on the distinguished drilling technology of highly-deviated wells/horizontal wells in deep carbonate rocks,the fault complexity ratio is decreased from 20.7% to 4.9%,so safe and fast drilling and completion of highly-deviated wells/horizontal wells is realized and well control risks are diminished.What's more,the drilling rates of type Ⅰ and Ⅱ reservoirs are increased from 24.2% to 87.3%,indicating an effective improvement of reservoir drilling rates.Fifth,based on the open-hole segmented accurate acid fracturing technology of highly-deviated and horizontal wells,the difficulty in the highly-heterogeneous reservoir stimulation by horizontal well drilling is solved by conducting the differentiated acid fracturing process of“one segment,one strategy”.Based on the application of these innovative development technologies in the Deng 4 Member gas reservoir in the marginal platform belt of the Anyue gas field,the annual natural gas production capacity and cumulative natural gas production by the end of December 2020 are 60×10^(8) m^(3) and 103×10^(8) m^(3),respectively.In this way,the Sinian Dengying Formation gas reservoir of the Anyue gas field,the economic benefit of which is close to the marginal benefit,becomes the main force of conventional natural gas production increase.展开更多
Objective Bitumen is generally associated with oil and gas, which was originally used as an indicator of hydrocarbon reservoirs. With the progress of organic geochemical measuring and testing techniques, bitumen, esp...Objective Bitumen is generally associated with oil and gas, which was originally used as an indicator of hydrocarbon reservoirs. With the progress of organic geochemical measuring and testing techniques, bitumen, especially solid bitumen sampled from reservoirs, has been proved to be closely related to the evolution of hydrocarbon reservoirs. The Sinian cores collected from the Anyue gas field contain abundant pores, vugs and fractures, which are filled with a mass of solid bitumen of two epochs and dolomite in between. This work focused on the characteristics of different generations of bitumen and the genesis, in an effort to better understand the process of the Sinian gas accumulation in the Anyue gas field.展开更多
Using the meteorological data during 1971- 2013 and lemon growth and yield data during 2003- 2013 in Anyue,the suitability problem of lemon growth and correlation problem between meteorological factors and lemon growt...Using the meteorological data during 1971- 2013 and lemon growth and yield data during 2003- 2013 in Anyue,the suitability problem of lemon growth and correlation problem between meteorological factors and lemon growth in Anyue area were studied. According to relevance between the selected meteorological factors and yield of lemon,meteorological prediction model of lemon yield was established in Anyue,and the prediction accuracy was higher. The research had certain guiding significance for management work of lemon production in Anyue area.展开更多
In the Anyue Gasfield,Sichuan Basin,the Lower Cambrian Longwangmiao Fm gas reservoir in Moxi Block has enormous natural gas reserves,and it is a typical three-high(high temperature,high pressure,and high flow rate)sou...In the Anyue Gasfield,Sichuan Basin,the Lower Cambrian Longwangmiao Fm gas reservoir in Moxi Block has enormous natural gas reserves,and it is a typical three-high(high temperature,high pressure,and high flow rate)sour gas field.Its ground engineering project(with the designed gas processing capacity of 60×10^(8)m^(2)/a)is characterized by high processing rate of each unit,complex process control,large construction load,restricted construction site and tight schedule.Based on the traditional engineering construction mode,however,it is difficult to complete the project design and construction within 16 months.In view of this,the design concept of unit large-scale modularization was introduced to implement“normalized design,scale purchase,factory-like prefabrication and modularized construction”and develop the modularization technology of large-scale surface engineering construction.This modularizationtechnology is performed as follows.First,the modularized units are laid out reasonably according to the technological process.Second,the layout of modularized units is usually super-imposed in the multi-layer framework.Third,those equipments with the same or similar operational modes,medium properties,functional characteristics and installation requirements are concentrated in the pattem of a module.Fourth,escape passageway is specially set up.Fifth,room for installation,maintenance and repair of large equipments is reserved.And sixth,transportation and hoisting requirements of modules are taken into consideration sufficiently.This technology is contributive to the improvement of design quality,effective shortening of design period,reduction of field working load,decrease of safety management risk of on-site installation,increase of production efficiency,conservation of land occupation and diminishment of construction investment.It plays a reference role in the modularized construction of surface engineering of similar large projects.展开更多
The Lower Cambrian Longwangmiao Fm,the 4th and 2nd members of the Sinian Dengying Fm are the three major gas layers in the Anyue Gas Field of the Sichuan Basin.Their main characteristics and genesis mechanism were inv...The Lower Cambrian Longwangmiao Fm,the 4th and 2nd members of the Sinian Dengying Fm are the three major gas layers in the Anyue Gas Field of the Sichuan Basin.Their main characteristics and genesis mechanism were investigated,and the following three findings were obtained.First,according to sedimentary microfacies,lithology and porosity,the Longwangmiao Fm is identified as fractured-vuggy dolomite reservoir of grain shoal facies,the 4th member of the Dengying Fm as fractured-vuggy(cavernous)dolomite reservoir of cyanobacteria mound beach facies,and the 2nd member of the Dengying Fm as fractured-vuggy dolomite reservoirs of cyanobacteria mound beach facies.Second,the Longwangmiao Fm is mainly grain dolomite,with dissolution pores and vugs as major reservoir space,at an average porosity of 4.24%and an average thickness of 36 m.The 4th member of the Dengying Fm made up of cyanobacteria dolomite has dissolution pores,vugs and caverns as major reservoir space with an average porosity of 3.22%and an average thickness of 70 m.The 2nd member of the Dengying Fm composed of cyanobacteria dolomite has fractures and vugs as major reservoir space with an average porosity of 3.34%and an average thickness of 80 m.Third,those reservoirs experienced multiple evolutionary stages including porosity development,hydrothermal mineral filling,asphalt filling etc.Penecontemporaneous dissolution and supergene karstification are the key factors controlling the formation of the reservoir space and the evolution models of the reservoirs were figured out.展开更多
The overall development of the top of the gas reservoir of the Dengying Formation,Upper Sinian in the Anyue Gas Field of the Sichuan Basin,has been deployed,and the inner Dengying Formation is the next potential succe...The overall development of the top of the gas reservoir of the Dengying Formation,Upper Sinian in the Anyue Gas Field of the Sichuan Basin,has been deployed,and the inner Dengying Formation is the next potential succession layer.However,the high-quality reservoirs of inner Dengying Formation are undeveloped and cannot be identified on the seismic profiles,which restricts its deepened understanding,exploration and development.In this paper,the logging and seismic response characteristics of high-quality reservoirs were analyzed using the mud logging and well logging data of the Anyue Gas Field,and a seismic response model for high-quality reservoir was established by means of seismic forward modeling.Then,the target processing was carried out for the problem of weak effective signals.Finally,the plane distribution of high-quality reservoirs of inner Dengying Formation and the favorable exploration areas were predicted.And the following research results were obtained.First,there are two types of high-quality reservoirs inside the Dengying Formation,i.e.,concentrated vug type and independent cave type.Vertically,the independent cave reservoirs are mainly distributed within 100 m above the mudstone floor of the third Member of Dengying Formation.Horizontally,karst zones are developed along the bed.Laterally,they are scattered and beaded.And the scale is small.Second,seismic response of high-quality reservoirs inside the carbonate rocks is characterized by single-peak concealed“beaded”reflection,whose peak energy is relatively weak and can be easily covered by the noise of seismic data.Third,deep-seated weak signal recovery and processing technology can be used to deal with the weak seismic response of high-quality cave reservoirs,improve the amplitude preservation and S/N ratio of seismic data,and obtain the beaded reflections on seismic profiles so as to realize effective identification of high-quality cave reservoirs.In conclusion,the deep-seated weak signal recovery and processing technology is proved to be operable because the achieved results conform to the drilling data and the seismic forward modeling conclusions.In addition,high-quality cave reservoirs are developed at the bottom of the fourth Member of Dengying Formation,and they are locally distributed in a large scale.Therefore,it's one of the favorable succession layers for the following natural gas exploration and development of the Anyue Gas Field.展开更多
In recent years,the Sichuan Basin has been the most potential hydrocarbon-bearing basin in China thanks to the great exploration and development breakthroughs of deep large integral carbonate gas reservoirs and shale ...In recent years,the Sichuan Basin has been the most potential hydrocarbon-bearing basin in China thanks to the great exploration and development breakthroughs of deep large integral carbonate gas reservoirs and shale gas in this basin.The Anyue Gas Field located in central Sichuan Basin is not only the largest carbonate gas reservoir,but the most important supergiant gas field discovered in China in recent years.However,it faces a series of major difficulties,e.g.,low reservoir porosity,low permeability,low gas well productivity,thin and vertically and laterally disperse gas layer,strong heterogeneity,quite low structural amplitude and complicated gasewater relationship,which bring great challenges to the rapid conversion of natural gas reserves to production.In this regard,technical researches have been carried out continuously.As a result,many key technologies have been innovatively integrated and great breakthroughs have been realized in many aspects.First,fine development technologies for supergiant,ancient and complex carbonate gas reservoirs are developed innovatively,“transparent gas reservoir”is constructed and the technologies for cultivating high-yield wells are established.By virtue of these technologies,all development wells in the gas reservoir of Lower Cambrian Longwangmiao Formation reach the target of high yield and the single-well gas production rate of the gas reservoir of Lower Sinian Dengying Formation is increased significantly,which provides support for the long-term high production and stable production of Anyue Gas Field.Second,good and fast construction technologies for large-scale gas fields are innovatively integrated.Based on this,the safety of gas wells is under control in the whole life cycle,quality engineering is built up efficiently within 3 years,green mining areas are forged and large-scale safe and clean gas fields are built up efficiently.Third,intelligent control technologies for the development of supergiant gas fields are innovatively integrated.By means of these technologies,internet of everything,depth perception and automatic production are realized.The intelligent technologies of new generation are fused,including AR,VR,robot and unmanned aerial vehicle(UAV).A new intelligent management mode for gas field development is set up,and an intelligent gas field is built up.Fourth,optimization technologies for the overall development of supergiant gas fields are innovatively development,so as to improve the development effects of strong-heterogeneity gas reservoirs and ensure the long-term stable production of supergiant water-bearing gas reservoirs.The research results can be used as reference for the efficient development of similar domestic and foreign gas fields.展开更多
In Anyue dialect,the meaning of the word“che”is very rich.It can be used as a verb to express the meaning of“argument,”“discussion,”“tearing,”“receiving,”“cutting,”“picking,”“opening,”“buying,”and“p...In Anyue dialect,the meaning of the word“che”is very rich.It can be used as a verb to express the meaning of“argument,”“discussion,”“tearing,”“receiving,”“cutting,”“picking,”“opening,”“buying,”and“pulling.”It can also be used as an adjective to express the meaning of“immoral,”“unreliable,”and“naughty.”This article describes the semantics and usage of“che”in Anyue dialect as well as the usage of special phrases with“che”in other areas of southwest Mandarin.Finally,this article analyzes the semantic evolution of“che”and constructs a semantic evolution diagram.展开更多
Exploration of the Sinian-Lower Paleozoic formations in the Sichuan Basin starts from the 1950s,and is tortuous and complex.To summarize the exploration experiences is of great significance of reference for exploratio...Exploration of the Sinian-Lower Paleozoic formations in the Sichuan Basin starts from the 1950s,and is tortuous and complex.To summarize the exploration experiences is of great significance of reference for exploration of oil and gas in deep carbonate rocks of the Sichuan Basin.Gas accumulation in the Anyue oversize gasfield is chiefly controlled by the Deyang-Anyue intra-platform rift and central Sichuan paleouplift.The intra-platform rift controls the scale hydrocarbon generation center and effective hydrocarbon plays.The Anyue gasfield is characterized by near-source hydrocarbon accumulation.The marginal zone of intra-platform rift and high part of the paleouplift control the scale distribution of favorable facies belts of reservoir development,and overlapped by paleokarstic reformation,the reservoirs are widely distributed.The intra-platform rift and paleouplift jointly control formation of the scale traps and hydrocarbon enrichment.Gas reservoir features and major controlling factors for hydrocarbon accumulation have some differences in the main play strata,such as Longwangmiao Formation,and Member 4 and Member 2 of Dengying Formation.The gas reservoir in the Longwangmiao Formation is a lithologic gas reservoir under the tectonic setting,and the inherited paleouplift is a key for reservoir formation and hydrocarbon accumulation.The gas reservoir in the Member 4 of Dengying Formation is mainly controlled by large structural-stratigraphic composite traps,and the gas reservoir in the Member 2 of Dengying Formation is the structural trap.Distribution of the large gasfields in the Dengying Formation is controlled by the intra-platform rift,near-source hydrocarbon-reservoir configuration controlled by the ancient erosion plane and stratigraphic sealing in the updip direction.For exploration and development of the Anyue gasfield,four series of technologies are developed,namely,reservoir seismic fine description technology,well logging fine evaluation technology of gas layers,fast drilling technology of complex strata,and stimulation technology for high temperature and high pressure gas layers.Technical progresses provide powerful guarantee for efficient exploration and development of the oversize gasfields.展开更多
For safe and efficient development of the sour gas reservoirs of the Cambrian Longwangmiao Fm in the Anyue Gas Field,the Sichuan Basin,and reduction of safety barrier failures and annulus abnormal pressure which are c...For safe and efficient development of the sour gas reservoirs of the Cambrian Longwangmiao Fm in the Anyue Gas Field,the Sichuan Basin,and reduction of safety barrier failures and annulus abnormal pressure which are caused by erosion,corrosion,thread leakage and improper well completion operations,a series of studies and field tests were mainly carried out,including optimization of well completion modes,experimental evaluation and optimization of string materials,sealing performance evaluation of string threads,structural optimization design of downhole pipe strings and erosion resistance evaluation of pipe strings,after the technical difficulties related with the well completion in this reservoir were analyzed.And consequently,a set of complete well completion technologies suitable for HTHP(high temperature and high pressure)and highflowrate gas wells with acidic media was developed as follows.First,optimize well completion modes,pipe string materials and thread types.Second,prepare optimized string structures for different production allocation conditions.And third,formulate well completion process and quality control measures for vertical and inclined wells.Field application results show that the erosion of high-flowrate production on pipe strings and downhole tools and the effect of perforation on the sealing performance of production packers were reduced effectively,well completion quality was improved,and annulus abnormal pressure during the late production was reduced.This research provides a reference for the development of similar gasfields.展开更多
At a refrigerated warehouse in the Jinghe International Rail-Road Intermodal Logistics Park in Bortala Mongolian Autonomous Prefecture in north Xinjiang Uygur Autonomous Region,pallets of golden lemons were stacked hi...At a refrigerated warehouse in the Jinghe International Rail-Road Intermodal Logistics Park in Bortala Mongolian Autonomous Prefecture in north Xinjiang Uygur Autonomous Region,pallets of golden lemons were stacked high,reaching toward the ceiling.Freshly arriving from Anyue,a county in the southwestern province of Sichuan,known as China5s 4iemon capitalthey were undergoing a final sorting before their journey to Almaty,Kazakhstan.What made this shipment remarkable wasn^just the produce;it was the speed of the journey west:Within 24 hours of leaving this logistics hub,the lemons would reach the supermarkets of Central Asia.展开更多
基金Project supported by the National Science and Technology Major Project“Demonstration Project of Giant Carbonate Gas Field Development in Sichuan Basin”(No.2016ZX05052)the PetroChina Major Technology Special Project“Research and Application of Key Technology for Large-scale Efficient Development of the Fourth Member of Dengying Formation in Central Sichuan”(No.:2016E-0606).
文摘The Sinian Dengying Formation gas reservoir in the Anyue gas field of the Sichuan Basin is an ultra-deep ancient dolomite karst gas reservoir,whose development is of high difficulty,for the reservoir is thin and scattered with strong heterogeneity and is overall characterized by low porosity and low permeability.In order to provide support for the large-scale productivity construction of the gas reservoir of the fourth member of Dengying Formation(Deng 4 Member)in the marginal platform belt of the Anyue gas field,this paper carries out multi-discipline comprehensive researches on the technical bottlenecks based on the geological characteristics of the gas reservoir.In addition,the targeted key technologies for the efficient development of gas reservoirs were developed in the mode of“simultaneous research,application and improvement”.And the following research results are obtained.First,based on the modeling technology of fracturedevuggy dolomite karst reservoirs,accurate modeling of karst reservoirs is realized.Late actual drilling results show that the model's coincidence rate is increased from 63.0% to 90.7% and the“transparency”of gas reservoirs is achieved.Second,based on the reserve mobility evaluation technology of lowporosity and highly-heterogeneous karst reservoirs,the recovery factors of different reservoirs are determined.And consequently,the lower limit of well-controlled reserves and radius for the efficient development of different reservoirs are obtained and type Ⅰ and Ⅱ reservoirs are selected as the main development targets.Third,based on the development optimization design technology of highly-heterogeneous karst gas reservoirs,it is recommended to apply highly-deviated wells(the maximum deviation angle of 75°-84°)in the situations with multiple reservoirs crossed and superimposed.If type Ⅰ and Ⅱ reservoirs are developed intensively,it is recommended to adopt horizontal well drilling with a horizontal section of 800-1100 m.What's more,the reasonable well spacing in type Ⅰ and Ⅱ reservoirs shall be 1.6-3.3 km and 0.9-1.4 km,respectively.Fourth,based on the distinguished drilling technology of highly-deviated wells/horizontal wells in deep carbonate rocks,the fault complexity ratio is decreased from 20.7% to 4.9%,so safe and fast drilling and completion of highly-deviated wells/horizontal wells is realized and well control risks are diminished.What's more,the drilling rates of type Ⅰ and Ⅱ reservoirs are increased from 24.2% to 87.3%,indicating an effective improvement of reservoir drilling rates.Fifth,based on the open-hole segmented accurate acid fracturing technology of highly-deviated and horizontal wells,the difficulty in the highly-heterogeneous reservoir stimulation by horizontal well drilling is solved by conducting the differentiated acid fracturing process of“one segment,one strategy”.Based on the application of these innovative development technologies in the Deng 4 Member gas reservoir in the marginal platform belt of the Anyue gas field,the annual natural gas production capacity and cumulative natural gas production by the end of December 2020 are 60×10^(8) m^(3) and 103×10^(8) m^(3),respectively.In this way,the Sinian Dengying Formation gas reservoir of the Anyue gas field,the economic benefit of which is close to the marginal benefit,becomes the main force of conventional natural gas production increase.
基金supported by the National Natural Science Foundation of China(grant No.41572133)National Key Basic Research and Development Project (grant No.2012CB214805)
文摘Objective Bitumen is generally associated with oil and gas, which was originally used as an indicator of hydrocarbon reservoirs. With the progress of organic geochemical measuring and testing techniques, bitumen, especially solid bitumen sampled from reservoirs, has been proved to be closely related to the evolution of hydrocarbon reservoirs. The Sinian cores collected from the Anyue gas field contain abundant pores, vugs and fractures, which are filled with a mass of solid bitumen of two epochs and dolomite in between. This work focused on the characteristics of different generations of bitumen and the genesis, in an effort to better understand the process of the Sinian gas accumulation in the Anyue gas field.
基金Supported by Government Science Research Item of Anyue County,China(2013-17)
文摘Using the meteorological data during 1971- 2013 and lemon growth and yield data during 2003- 2013 in Anyue,the suitability problem of lemon growth and correlation problem between meteorological factors and lemon growth in Anyue area were studied. According to relevance between the selected meteorological factors and yield of lemon,meteorological prediction model of lemon yield was established in Anyue,and the prediction accuracy was higher. The research had certain guiding significance for management work of lemon production in Anyue area.
文摘In the Anyue Gasfield,Sichuan Basin,the Lower Cambrian Longwangmiao Fm gas reservoir in Moxi Block has enormous natural gas reserves,and it is a typical three-high(high temperature,high pressure,and high flow rate)sour gas field.Its ground engineering project(with the designed gas processing capacity of 60×10^(8)m^(2)/a)is characterized by high processing rate of each unit,complex process control,large construction load,restricted construction site and tight schedule.Based on the traditional engineering construction mode,however,it is difficult to complete the project design and construction within 16 months.In view of this,the design concept of unit large-scale modularization was introduced to implement“normalized design,scale purchase,factory-like prefabrication and modularized construction”and develop the modularization technology of large-scale surface engineering construction.This modularizationtechnology is performed as follows.First,the modularized units are laid out reasonably according to the technological process.Second,the layout of modularized units is usually super-imposed in the multi-layer framework.Third,those equipments with the same or similar operational modes,medium properties,functional characteristics and installation requirements are concentrated in the pattem of a module.Fourth,escape passageway is specially set up.Fifth,room for installation,maintenance and repair of large equipments is reserved.And sixth,transportation and hoisting requirements of modules are taken into consideration sufficiently.This technology is contributive to the improvement of design quality,effective shortening of design period,reduction of field working load,decrease of safety management risk of on-site installation,increase of production efficiency,conservation of land occupation and diminishment of construction investment.It plays a reference role in the modularized construction of surface engineering of similar large projects.
基金National Science and Technology MajorProject(2011ZX05004-002)PetroChina Exploration and Production Major Project(2012ZD01-02-03)PetroChina Special Project(2014e-32).
文摘The Lower Cambrian Longwangmiao Fm,the 4th and 2nd members of the Sinian Dengying Fm are the three major gas layers in the Anyue Gas Field of the Sichuan Basin.Their main characteristics and genesis mechanism were investigated,and the following three findings were obtained.First,according to sedimentary microfacies,lithology and porosity,the Longwangmiao Fm is identified as fractured-vuggy dolomite reservoir of grain shoal facies,the 4th member of the Dengying Fm as fractured-vuggy(cavernous)dolomite reservoir of cyanobacteria mound beach facies,and the 2nd member of the Dengying Fm as fractured-vuggy dolomite reservoirs of cyanobacteria mound beach facies.Second,the Longwangmiao Fm is mainly grain dolomite,with dissolution pores and vugs as major reservoir space,at an average porosity of 4.24%and an average thickness of 36 m.The 4th member of the Dengying Fm made up of cyanobacteria dolomite has dissolution pores,vugs and caverns as major reservoir space with an average porosity of 3.22%and an average thickness of 70 m.The 2nd member of the Dengying Fm composed of cyanobacteria dolomite has fractures and vugs as major reservoir space with an average porosity of 3.34%and an average thickness of 80 m.Third,those reservoirs experienced multiple evolutionary stages including porosity development,hydrothermal mineral filling,asphalt filling etc.Penecontemporaneous dissolution and supergene karstification are the key factors controlling the formation of the reservoir space and the evolution models of the reservoirs were figured out.
基金Project supported by the National Key R&D Program of China“Theory and Technology Integration of Deep Resource Exploration and Mining”(No.:2018YFC0603706)Scientific Research and Technology Development Project of CNPC“Field Test and Integration Matching of Major Geophysical Technology”(No.:2017D-3503)。
文摘The overall development of the top of the gas reservoir of the Dengying Formation,Upper Sinian in the Anyue Gas Field of the Sichuan Basin,has been deployed,and the inner Dengying Formation is the next potential succession layer.However,the high-quality reservoirs of inner Dengying Formation are undeveloped and cannot be identified on the seismic profiles,which restricts its deepened understanding,exploration and development.In this paper,the logging and seismic response characteristics of high-quality reservoirs were analyzed using the mud logging and well logging data of the Anyue Gas Field,and a seismic response model for high-quality reservoir was established by means of seismic forward modeling.Then,the target processing was carried out for the problem of weak effective signals.Finally,the plane distribution of high-quality reservoirs of inner Dengying Formation and the favorable exploration areas were predicted.And the following research results were obtained.First,there are two types of high-quality reservoirs inside the Dengying Formation,i.e.,concentrated vug type and independent cave type.Vertically,the independent cave reservoirs are mainly distributed within 100 m above the mudstone floor of the third Member of Dengying Formation.Horizontally,karst zones are developed along the bed.Laterally,they are scattered and beaded.And the scale is small.Second,seismic response of high-quality reservoirs inside the carbonate rocks is characterized by single-peak concealed“beaded”reflection,whose peak energy is relatively weak and can be easily covered by the noise of seismic data.Third,deep-seated weak signal recovery and processing technology can be used to deal with the weak seismic response of high-quality cave reservoirs,improve the amplitude preservation and S/N ratio of seismic data,and obtain the beaded reflections on seismic profiles so as to realize effective identification of high-quality cave reservoirs.In conclusion,the deep-seated weak signal recovery and processing technology is proved to be operable because the achieved results conform to the drilling data and the seismic forward modeling conclusions.In addition,high-quality cave reservoirs are developed at the bottom of the fourth Member of Dengying Formation,and they are locally distributed in a large scale.Therefore,it's one of the favorable succession layers for the following natural gas exploration and development of the Anyue Gas Field.
基金supported by the National Major Science and Technology Project“Demonstration Project of Developing Large-Scale Carbonate Gas Field in the Sichuan Basin”(No.:2016ZX05052)PetroChina Major Science and Technology Project“Research and Application of Key Techniques for Put on Production of 30 Billion Cubic Meters of Natural Gas in Southwest Oil and Gas Fields”(No.:2016E-06).
文摘In recent years,the Sichuan Basin has been the most potential hydrocarbon-bearing basin in China thanks to the great exploration and development breakthroughs of deep large integral carbonate gas reservoirs and shale gas in this basin.The Anyue Gas Field located in central Sichuan Basin is not only the largest carbonate gas reservoir,but the most important supergiant gas field discovered in China in recent years.However,it faces a series of major difficulties,e.g.,low reservoir porosity,low permeability,low gas well productivity,thin and vertically and laterally disperse gas layer,strong heterogeneity,quite low structural amplitude and complicated gasewater relationship,which bring great challenges to the rapid conversion of natural gas reserves to production.In this regard,technical researches have been carried out continuously.As a result,many key technologies have been innovatively integrated and great breakthroughs have been realized in many aspects.First,fine development technologies for supergiant,ancient and complex carbonate gas reservoirs are developed innovatively,“transparent gas reservoir”is constructed and the technologies for cultivating high-yield wells are established.By virtue of these technologies,all development wells in the gas reservoir of Lower Cambrian Longwangmiao Formation reach the target of high yield and the single-well gas production rate of the gas reservoir of Lower Sinian Dengying Formation is increased significantly,which provides support for the long-term high production and stable production of Anyue Gas Field.Second,good and fast construction technologies for large-scale gas fields are innovatively integrated.Based on this,the safety of gas wells is under control in the whole life cycle,quality engineering is built up efficiently within 3 years,green mining areas are forged and large-scale safe and clean gas fields are built up efficiently.Third,intelligent control technologies for the development of supergiant gas fields are innovatively integrated.By means of these technologies,internet of everything,depth perception and automatic production are realized.The intelligent technologies of new generation are fused,including AR,VR,robot and unmanned aerial vehicle(UAV).A new intelligent management mode for gas field development is set up,and an intelligent gas field is built up.Fourth,optimization technologies for the overall development of supergiant gas fields are innovatively development,so as to improve the development effects of strong-heterogeneity gas reservoirs and ensure the long-term stable production of supergiant water-bearing gas reservoirs.The research results can be used as reference for the efficient development of similar domestic and foreign gas fields.
文摘In Anyue dialect,the meaning of the word“che”is very rich.It can be used as a verb to express the meaning of“argument,”“discussion,”“tearing,”“receiving,”“cutting,”“picking,”“opening,”“buying,”and“pulling.”It can also be used as an adjective to express the meaning of“immoral,”“unreliable,”and“naughty.”This article describes the semantics and usage of“che”in Anyue dialect as well as the usage of special phrases with“che”in other areas of southwest Mandarin.Finally,this article analyzes the semantic evolution of“che”and constructs a semantic evolution diagram.
基金The work was supported by the National Science and Technology Major Project of China(No.2016ZX05004005,2016ZX05007004).
文摘Exploration of the Sinian-Lower Paleozoic formations in the Sichuan Basin starts from the 1950s,and is tortuous and complex.To summarize the exploration experiences is of great significance of reference for exploration of oil and gas in deep carbonate rocks of the Sichuan Basin.Gas accumulation in the Anyue oversize gasfield is chiefly controlled by the Deyang-Anyue intra-platform rift and central Sichuan paleouplift.The intra-platform rift controls the scale hydrocarbon generation center and effective hydrocarbon plays.The Anyue gasfield is characterized by near-source hydrocarbon accumulation.The marginal zone of intra-platform rift and high part of the paleouplift control the scale distribution of favorable facies belts of reservoir development,and overlapped by paleokarstic reformation,the reservoirs are widely distributed.The intra-platform rift and paleouplift jointly control formation of the scale traps and hydrocarbon enrichment.Gas reservoir features and major controlling factors for hydrocarbon accumulation have some differences in the main play strata,such as Longwangmiao Formation,and Member 4 and Member 2 of Dengying Formation.The gas reservoir in the Longwangmiao Formation is a lithologic gas reservoir under the tectonic setting,and the inherited paleouplift is a key for reservoir formation and hydrocarbon accumulation.The gas reservoir in the Member 4 of Dengying Formation is mainly controlled by large structural-stratigraphic composite traps,and the gas reservoir in the Member 2 of Dengying Formation is the structural trap.Distribution of the large gasfields in the Dengying Formation is controlled by the intra-platform rift,near-source hydrocarbon-reservoir configuration controlled by the ancient erosion plane and stratigraphic sealing in the updip direction.For exploration and development of the Anyue gasfield,four series of technologies are developed,namely,reservoir seismic fine description technology,well logging fine evaluation technology of gas layers,fast drilling technology of complex strata,and stimulation technology for high temperature and high pressure gas layers.Technical progresses provide powerful guarantee for efficient exploration and development of the oversize gasfields.
基金Project supported by the National Manjor S&T Project“Development Demonstration Project of Large Carbonate Gas Field in Longgang Area,the Sichuan Basin”(No.2011ZX05047-02)Ph.D Station S&T Research Project of PetroChina Southwest Oil and Gas Field Company“Study on String Mechanics concerning to the Integrity of HTHP High-yield Gas Wells in the Longwangmiao Fm Reservoir”(No.20140305-11).
文摘For safe and efficient development of the sour gas reservoirs of the Cambrian Longwangmiao Fm in the Anyue Gas Field,the Sichuan Basin,and reduction of safety barrier failures and annulus abnormal pressure which are caused by erosion,corrosion,thread leakage and improper well completion operations,a series of studies and field tests were mainly carried out,including optimization of well completion modes,experimental evaluation and optimization of string materials,sealing performance evaluation of string threads,structural optimization design of downhole pipe strings and erosion resistance evaluation of pipe strings,after the technical difficulties related with the well completion in this reservoir were analyzed.And consequently,a set of complete well completion technologies suitable for HTHP(high temperature and high pressure)and highflowrate gas wells with acidic media was developed as follows.First,optimize well completion modes,pipe string materials and thread types.Second,prepare optimized string structures for different production allocation conditions.And third,formulate well completion process and quality control measures for vertical and inclined wells.Field application results show that the erosion of high-flowrate production on pipe strings and downhole tools and the effect of perforation on the sealing performance of production packers were reduced effectively,well completion quality was improved,and annulus abnormal pressure during the late production was reduced.This research provides a reference for the development of similar gasfields.
文摘At a refrigerated warehouse in the Jinghe International Rail-Road Intermodal Logistics Park in Bortala Mongolian Autonomous Prefecture in north Xinjiang Uygur Autonomous Region,pallets of golden lemons were stacked high,reaching toward the ceiling.Freshly arriving from Anyue,a county in the southwestern province of Sichuan,known as China5s 4iemon capitalthey were undergoing a final sorting before their journey to Almaty,Kazakhstan.What made this shipment remarkable wasn^just the produce;it was the speed of the journey west:Within 24 hours of leaving this logistics hub,the lemons would reach the supermarkets of Central Asia.
