Ramp-type bioherm is geologically characterized by lateral migration,small size and discrete distribution.The fine bioherm description is of high difficulty and the benefit development of bioherm gas reservoirs can be...Ramp-type bioherm is geologically characterized by lateral migration,small size and discrete distribution.The fine bioherm description is of high difficulty and the benefit development of bioherm gas reservoirs can be hardly realized.To solve these difficulties,this paper put forward a new bioherm identification method based on well-seismic combination after cognizing the geological characteristics of ramp-type bioherms deeply.And this new method plays a successful role in guiding the drilling ofWell Y012-X16 in the mode of“two bioherms in one well”in the Damaoping Block of eastern Sichuan Basin.High-yield industrial gas flow of 113.65×10^(4)m^(3)/d is obtained during the test and great new progress is achieved in the exploration of bioherm gas reservoirs.And the following research results were obtained.First,the degree of slope at the marginal platform slope of ramp-type bioherm is only 2°-4°.The migration and evolution laws of bioherms are mainly controlled by the change of paleogeomorphology and sea level.As a result,small bioherms of multiple rows and multiple periods are formed and the gas-water contact of ramp-type bioherm gas reservoir is not united,presenting the characteristics of“one bioherm,one reservoir”.The gas bearing property is good at the top of the bioherm.The overall gas bearing property is poorer in the early bioherm of the second member of Upper Permian Changxing Formation and better in the late bioherm of the third member of Changxing Formation.Second,a new bioherm identification method with“double-high”integrated seismic processing technology,data driven“box-shaped volume”perspective technology,remaining thickness method based sedimentary paleogeomorphology restoration technology and three-dimensional visualization technology as the core is developed innovatively,which provides the fine description of ramp-type small bioherms in the three dimensional space.Third,based on the application of the new bioherm identification method,the distribution detail of the bioherms in the Damaoping Block is clarified,the development mode of“two bioherms in onewell”for long horizontal sections is established and a PetroChina's new record of bioherm reservoir drilling length is set up in Well Y012-X16,which launches a new means to the benefit development of small bioherm group.Fourth,it is predicted that a number of bioherm development areas can be newly increased in the Damaoping Block,which can provide the supplement productivity of 100×10^(4)m^(3)/d for the development of gas reservoirs,so their natural gas exploration and development potential is huge.In conclusion,the fine description technologies for ramp-type small bioherms are conducive to the identification of ramp-type small bioherm group and the efficient exploration and development of bioherm gas reservoirs in the Sichuan Basin.展开更多
The latest researches reveal that studies on unconventional clastic oil reservoirs in China generally lag far behind those in other countries in respect of content and methodology.This study presents the definition an...The latest researches reveal that studies on unconventional clastic oil reservoirs in China generally lag far behind those in other countries in respect of content and methodology.This study presents the definition and classification of unconventional oil reservoirs and analyzes the problems in the fine description of unconventional oil reservoirs.The key content of the fine description of unconventional oil reservoirs is summarized from four aspects:fine fracture characterization based on fine structure interpretation,reservoir architecture characterization based on sedimentary facies,characteristics of nanoscale microscopic pore structure of reservoir,and evaluation of source rock and“sweet spot zone”.Finally,this study suggests that development of fine description of unconventional clastic oil reservoirs in the future should focus on rock brittleness analysis and fracture modeling,geophysical characterization of unconventional clastic oil reservoirs,fluid description of tight reservoirs,and physical/numerical simulation experiments of unconventional oil reservoirs.展开更多
Through specific investigation and investigation and demonstration, it can be seen that Liaohe Oilfield is a typical compound oil and gas field. In the specific development process, it presents relatively obvious char...Through specific investigation and investigation and demonstration, it can be seen that Liaohe Oilfield is a typical compound oil and gas field. In the specific development process, it presents relatively obvious characteristics such as high development difficulty, large contradiction, further in-depth exploration and better and more detailed reservoir description. In the specific development process, for Liaohe Oilfield, more accurate and effective description should be made and more rich experience should be accumulated. Only in this way can a better description and practical application effect be achieved, thus providing the necessary guarantee for the refined development and sustainable development of Liaohe Oilfield. Based on this situation, this paper focuses on the cognition of refined reservoir description in Liaohe Oilfield and the corresponding practical strategies.展开更多
In the Jiaoshiba block of the Fuling shale gas field,the employed reserves and recovery factor by primary well pattern are low,no obvious barrier is found in the development layer series,and layered development is dif...In the Jiaoshiba block of the Fuling shale gas field,the employed reserves and recovery factor by primary well pattern are low,no obvious barrier is found in the development layer series,and layered development is difficult.Based on the understanding of the main factors controlling shale gas enrichment and high production,the theory and technology of shale gas three-dimensional development,such as fine description and modeling of shale gas reservoir,optimization of three-dimensional development strategy,highly efficient drilling with dense well pattern,precision fracturing and real-time control,are discussed.Three-dimensional development refers to the application of optimal and fast drilling and volume fracturing technologies,depending upon the sedimentary characteristics,reservoir characteristics and sweet spot distribution of shale gas,to form"artificial gas reservoir"in a multidimensional space,so as to maximize the employed reserves,recovery factor and yield rate of shale gas development.In the research on shale gas three-dimensional development,the geological+engineering sweet spot description is fundamental,the collaborative optimization of natural fractures and artificial fractures is critical,and the improvement of speed and efficiency in drilling and fracturing engineering is the guarantee.Through the implementation of three-dimensional development,the overall recovery factor in the Jiaoshiba block has increased from 12.6%to 23.3%,providing an important support for the continuous and stable production of the Fuling shale gas field.展开更多
In recent years,deep marine carbonate gas reservoirs have become an important field in increasing conventional gas reserves and production in the Sichuan Basin.Due to complex hydrocarbon accumulation conditions,great ...In recent years,deep marine carbonate gas reservoirs have become an important field in increasing conventional gas reserves and production in the Sichuan Basin.Due to complex hydrocarbon accumulation conditions,great burial depth and complicate gas-water relation,however,this type of gas reservoirs faces huge challenges to realize efficient development.In this paper,the development history of deep marine carbonate gas reservoirs in the Sichuan Basin was analyzed.Then,based on such development characteristics and practices,special technologies were summarized.Finally,the research direction for the coming years was pointed out.And the following research results were obtained.First,the reserves of the deep marine carbonate gas reservoirs in the Sichuan Basin vary greatly in scales and types.The reservoirs are of poor quality and strong heterogeneity with active edge and bottom water.The raw gas generally contains acidic gas.What's more,most development wells are located in mountainous areas,and drilled formations are complicated in vertical distribution.Second,special technologies have been formed in the Sichuan Basin,including the fine description technology for strong-heterogeneity gas reservoirs in deep low-gentle structures,the optimized water control technology for the water-bearing gas reservoirs with developed small-scale fractures and vugs,drilling,completion and stimulation engineering technologies for deep complex gas wells,and the support technology for clean and safe development of sulfur-bearing gas reservoirs,so as to provide support for the efficient productivity construction and optimized development of giant marine carbonate reservoirs in the Sichuan Basin.Third,as the development of the carbonate gas reservoirs in the Sichuan Basin begins to convert into the gas reservoirs in ultra-deep complex structures,the next direction of technological research is the fine structure description and thin reservoir prediction technique,across-scale numerical simulation technique,drilling and completion and gas production engineering technique for deep marine carbonate gas reservoirs.It is concluded that these special technologies for the efficient development of deep marine carbonate gas reservoirs provides powerful support for PetroChina Southwest Company to build up giant gas fields with the reserves of tens of billions of cubic meters and realize the leaping growth of gas production.The research results can provide valuable technical reference for the development of deep marine carbonate gas reservoirs at home and abroad.展开更多
基金Project supported by the National Major Science and Technology Project“Demonstrative project of large carbonate gas field development in Sichuan Basin”(No.2016ZX05052)PetroChina Major Science and Technology Project“Research and application of key technology for a productivity of 30 billion cubic meters in Southwest Oil and Gas Field”(No.2016E-06).
文摘Ramp-type bioherm is geologically characterized by lateral migration,small size and discrete distribution.The fine bioherm description is of high difficulty and the benefit development of bioherm gas reservoirs can be hardly realized.To solve these difficulties,this paper put forward a new bioherm identification method based on well-seismic combination after cognizing the geological characteristics of ramp-type bioherms deeply.And this new method plays a successful role in guiding the drilling ofWell Y012-X16 in the mode of“two bioherms in one well”in the Damaoping Block of eastern Sichuan Basin.High-yield industrial gas flow of 113.65×10^(4)m^(3)/d is obtained during the test and great new progress is achieved in the exploration of bioherm gas reservoirs.And the following research results were obtained.First,the degree of slope at the marginal platform slope of ramp-type bioherm is only 2°-4°.The migration and evolution laws of bioherms are mainly controlled by the change of paleogeomorphology and sea level.As a result,small bioherms of multiple rows and multiple periods are formed and the gas-water contact of ramp-type bioherm gas reservoir is not united,presenting the characteristics of“one bioherm,one reservoir”.The gas bearing property is good at the top of the bioherm.The overall gas bearing property is poorer in the early bioherm of the second member of Upper Permian Changxing Formation and better in the late bioherm of the third member of Changxing Formation.Second,a new bioherm identification method with“double-high”integrated seismic processing technology,data driven“box-shaped volume”perspective technology,remaining thickness method based sedimentary paleogeomorphology restoration technology and three-dimensional visualization technology as the core is developed innovatively,which provides the fine description of ramp-type small bioherms in the three dimensional space.Third,based on the application of the new bioherm identification method,the distribution detail of the bioherms in the Damaoping Block is clarified,the development mode of“two bioherms in onewell”for long horizontal sections is established and a PetroChina's new record of bioherm reservoir drilling length is set up in Well Y012-X16,which launches a new means to the benefit development of small bioherm group.Fourth,it is predicted that a number of bioherm development areas can be newly increased in the Damaoping Block,which can provide the supplement productivity of 100×10^(4)m^(3)/d for the development of gas reservoirs,so their natural gas exploration and development potential is huge.In conclusion,the fine description technologies for ramp-type small bioherms are conducive to the identification of ramp-type small bioherm group and the efficient exploration and development of bioherm gas reservoirs in the Sichuan Basin.
文摘The latest researches reveal that studies on unconventional clastic oil reservoirs in China generally lag far behind those in other countries in respect of content and methodology.This study presents the definition and classification of unconventional oil reservoirs and analyzes the problems in the fine description of unconventional oil reservoirs.The key content of the fine description of unconventional oil reservoirs is summarized from four aspects:fine fracture characterization based on fine structure interpretation,reservoir architecture characterization based on sedimentary facies,characteristics of nanoscale microscopic pore structure of reservoir,and evaluation of source rock and“sweet spot zone”.Finally,this study suggests that development of fine description of unconventional clastic oil reservoirs in the future should focus on rock brittleness analysis and fracture modeling,geophysical characterization of unconventional clastic oil reservoirs,fluid description of tight reservoirs,and physical/numerical simulation experiments of unconventional oil reservoirs.
文摘Through specific investigation and investigation and demonstration, it can be seen that Liaohe Oilfield is a typical compound oil and gas field. In the specific development process, it presents relatively obvious characteristics such as high development difficulty, large contradiction, further in-depth exploration and better and more detailed reservoir description. In the specific development process, for Liaohe Oilfield, more accurate and effective description should be made and more rich experience should be accumulated. Only in this way can a better description and practical application effect be achieved, thus providing the necessary guarantee for the refined development and sustainable development of Liaohe Oilfield. Based on this situation, this paper focuses on the cognition of refined reservoir description in Liaohe Oilfield and the corresponding practical strategies.
基金Supported by the Sinopec Science and Technology Project(P22183).
文摘In the Jiaoshiba block of the Fuling shale gas field,the employed reserves and recovery factor by primary well pattern are low,no obvious barrier is found in the development layer series,and layered development is difficult.Based on the understanding of the main factors controlling shale gas enrichment and high production,the theory and technology of shale gas three-dimensional development,such as fine description and modeling of shale gas reservoir,optimization of three-dimensional development strategy,highly efficient drilling with dense well pattern,precision fracturing and real-time control,are discussed.Three-dimensional development refers to the application of optimal and fast drilling and volume fracturing technologies,depending upon the sedimentary characteristics,reservoir characteristics and sweet spot distribution of shale gas,to form"artificial gas reservoir"in a multidimensional space,so as to maximize the employed reserves,recovery factor and yield rate of shale gas development.In the research on shale gas three-dimensional development,the geological+engineering sweet spot description is fundamental,the collaborative optimization of natural fractures and artificial fractures is critical,and the improvement of speed and efficiency in drilling and fracturing engineering is the guarantee.Through the implementation of three-dimensional development,the overall recovery factor in the Jiaoshiba block has increased from 12.6%to 23.3%,providing an important support for the continuous and stable production of the Fuling shale gas field.
基金Project supported by the National Major Science and Technology Project“Demonstration Project of Development of Large Carbonate Gas Fields in the Sichuan Basin”(No.:2016ZX05052)Scientific Research and Technological Development Project of PetroChina Company Limited“Research and Application of Key Technologies for 30 Bcm-level Gas Production in the Southwest Oil&Gas Field”(No.:2016E-06).
文摘In recent years,deep marine carbonate gas reservoirs have become an important field in increasing conventional gas reserves and production in the Sichuan Basin.Due to complex hydrocarbon accumulation conditions,great burial depth and complicate gas-water relation,however,this type of gas reservoirs faces huge challenges to realize efficient development.In this paper,the development history of deep marine carbonate gas reservoirs in the Sichuan Basin was analyzed.Then,based on such development characteristics and practices,special technologies were summarized.Finally,the research direction for the coming years was pointed out.And the following research results were obtained.First,the reserves of the deep marine carbonate gas reservoirs in the Sichuan Basin vary greatly in scales and types.The reservoirs are of poor quality and strong heterogeneity with active edge and bottom water.The raw gas generally contains acidic gas.What's more,most development wells are located in mountainous areas,and drilled formations are complicated in vertical distribution.Second,special technologies have been formed in the Sichuan Basin,including the fine description technology for strong-heterogeneity gas reservoirs in deep low-gentle structures,the optimized water control technology for the water-bearing gas reservoirs with developed small-scale fractures and vugs,drilling,completion and stimulation engineering technologies for deep complex gas wells,and the support technology for clean and safe development of sulfur-bearing gas reservoirs,so as to provide support for the efficient productivity construction and optimized development of giant marine carbonate reservoirs in the Sichuan Basin.Third,as the development of the carbonate gas reservoirs in the Sichuan Basin begins to convert into the gas reservoirs in ultra-deep complex structures,the next direction of technological research is the fine structure description and thin reservoir prediction technique,across-scale numerical simulation technique,drilling and completion and gas production engineering technique for deep marine carbonate gas reservoirs.It is concluded that these special technologies for the efficient development of deep marine carbonate gas reservoirs provides powerful support for PetroChina Southwest Company to build up giant gas fields with the reserves of tens of billions of cubic meters and realize the leaping growth of gas production.The research results can provide valuable technical reference for the development of deep marine carbonate gas reservoirs at home and abroad.
