Deep natural gas is an important field and direction for oil and gas exploration and development in the Banqiao depression.The geochemical characteristics of the Paleogene Shahejie Formation source rocks in the Banqia...Deep natural gas is an important field and direction for oil and gas exploration and development in the Banqiao depression.The geochemical characteristics of the Paleogene Shahejie Formation source rocks in the Banqiao Sag were investigated based on pyrolysis,Total Organic Carbon(TOC),chloroform bitumen A,vitrinite reflectance,saturated hydrocarbon gas chromatographyemass spectrometry,and maceral determination.The results showed that the Es_(3) source rocks of the Paleogene Shahejie Formation were generally of better quality than the Es_(1) source rocks.Regarding the Es_(1) source rocks,the abundance of organic matter was variable,with mixed types and low maturity.The source rocks were formed in a saline-water reductive environment.Regarding the Es_(3) source rocks,the abundance of organic matter was relatively high,meaning that they were of mediumehigh quality,with mixed types of,yet highly mature,organic matter.The hydrocarbon generation environment was oxidative,and the source rocks were mainly deposited in fresh water with localized salinization.The main hydrocarbon-generating components of organic matter in the Shahejie Formation were amorphous humic components formed by intensive microbial modification of lower planktonic algae and terrestrial higher plants.Aquatic organisms were the main sources of organic matter,with localized mixing of higher-plant organic matter.The organic matter derived from these higher plant debris sources provided beneficial conditions for the generation of natural gas.At present,the Shasan source rock is at the peak of hydrocarbon generation.Under deep conditions,the maturity of organic matter increases,and organic matter rich in terrestrial higher plants can make a significant contribution to the generation of natural gas,especially shale gas.展开更多
China is lack of bromine and potassium seriously.Oilfield brines is the headline goal of bromine and potassium resources exploration.Applicants grab 24oilfield brines samples from various wells of Ordovician
1 Introduction Shale formations bear abundant mineral resource and*unconventional petroleum resource,and the unconventional petroleum resource that contain in the shale formation should be integrated and researched.
1 Introduction The conflict between resources and the environment has been increasingly outstanding as the population,economy and society around the globe have developed rapidly since the 21st century.An important cha...1 Introduction The conflict between resources and the environment has been increasingly outstanding as the population,economy and society around the globe have developed rapidly since the 21st century.An important challenge that the human展开更多
According to the Geological settings and the distributed laws of ore bodies and previous research re- suits, combining with latest theories and new methods of geological prospecting, the authors proposed prospec- ting...According to the Geological settings and the distributed laws of ore bodies and previous research re- suits, combining with latest theories and new methods of geological prospecting, the authors proposed prospec- ting thoughts for substituted resources in Laozuoshan gold deposit. After ore prospecting in two years, nine new blind ore bodies were found, among which four ore bodies contain 4218. 1 kg inferred intrinsic economic re- sources （ 333 ）, and mitigate the crisis situation of mine reserves. At the same time, lots of significant geophysi- cal and geochemical anomalies were found in the peripheral, which provide a basis for further prospecting.展开更多
The presence of shale gas has been confirmed in almost every marine shale distribution area in North America.Formation conditions of shale gas in China are the most favorable for marine,organic-rich shale as well.But ...The presence of shale gas has been confirmed in almost every marine shale distribution area in North America.Formation conditions of shale gas in China are the most favorable for marine,organic-rich shale as well.But there has been little research focusing on shale gas in Qiangtang Basin,Qinghai-Tibet Plateau,where a lot of Mesozoic marine shale formations developed.Based on the survey results of petroleum geology and comprehensive test analysis data for Qinghai-Tibet Plateau,for the first time,this paper discusses characteristics of sedimentary development,thickness distribution,geochemistry,reservoir and burial depth of organic-rich shale,and geological conditions for shale gas formation in Qiangtang Basin.There are four sets of marine shale strata in Qiangtang Basin including Upper Triassic Xiaochaka Formation （T3x）,Middle Jurassic Buqu Formation （J2b）,Xiali Formation （J2x） and Upper Jurassic Suowa Formation （J3s）,the sedimentary types of which are mainly bathyal-basin facies,open platform-platform margin slope facies,lagoon and tidal-fiat facies,as well as delta facies.By comparing it with the indicators of gas shale in the main U.S.basins,it was found that the four marine shale formations in Qiangtang Basin constitute a multi-layer distribution of organic-rich shale,featuring a high degree of thickness and low abundance of organic matter,high thermal evolution maturity,many kinds of brittle minerals,an equivalent content of quartz and clay minerals,a high content of feldspar and low porosity,which provide basic conditions for an accumulation of shale gas resources.Xiaochaka Formation shale is widely distributed,with big thickness and the best gas generating indicators.It is the main gas source layer.Xiali Formation shale is of intermediate thickness and coverage area,with relatively good gas generating indicators and moderate gas formation potential.Buqu Formation shale and Suowa Formation shale are of relatively large thickness,and covering a small area,with poor gas generating indicators,and limited gas formation potential.The shale gas geological resources and technically recoverable resources were estimated by using geologic analogy method,and the prospective areas and potentially favorable areas for Mesozoic marine shale gas in Qiangtang Basin are forecast and analyzed.It is relatively favorable in a tectonic setting and indication of oil and gas,shale maturity,sedimentary thickness and gypsum-salt beds,and in terms of mineral association for shale gas accumulation.But the challenge lies in overcoming the harsh natural conditions which contributes to great difficulties in ground engineering and exploration,and high exploration costs.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.U20A2093).
文摘Deep natural gas is an important field and direction for oil and gas exploration and development in the Banqiao depression.The geochemical characteristics of the Paleogene Shahejie Formation source rocks in the Banqiao Sag were investigated based on pyrolysis,Total Organic Carbon(TOC),chloroform bitumen A,vitrinite reflectance,saturated hydrocarbon gas chromatographyemass spectrometry,and maceral determination.The results showed that the Es_(3) source rocks of the Paleogene Shahejie Formation were generally of better quality than the Es_(1) source rocks.Regarding the Es_(1) source rocks,the abundance of organic matter was variable,with mixed types and low maturity.The source rocks were formed in a saline-water reductive environment.Regarding the Es_(3) source rocks,the abundance of organic matter was relatively high,meaning that they were of mediumehigh quality,with mixed types of,yet highly mature,organic matter.The hydrocarbon generation environment was oxidative,and the source rocks were mainly deposited in fresh water with localized salinization.The main hydrocarbon-generating components of organic matter in the Shahejie Formation were amorphous humic components formed by intensive microbial modification of lower planktonic algae and terrestrial higher plants.Aquatic organisms were the main sources of organic matter,with localized mixing of higher-plant organic matter.The organic matter derived from these higher plant debris sources provided beneficial conditions for the generation of natural gas.At present,the Shasan source rock is at the peak of hydrocarbon generation.Under deep conditions,the maturity of organic matter increases,and organic matter rich in terrestrial higher plants can make a significant contribution to the generation of natural gas,especially shale gas.
基金supported by Geological survey project (Project Number: 12120113078500)
文摘China is lack of bromine and potassium seriously.Oilfield brines is the headline goal of bromine and potassium resources exploration.Applicants grab 24oilfield brines samples from various wells of Ordovician
基金supported by funding the National Basic Research Program of China (973 Program) and the grant number is 2014CB239000
文摘1 Introduction Shale formations bear abundant mineral resource and*unconventional petroleum resource,and the unconventional petroleum resource that contain in the shale formation should be integrated and researched.
文摘1 Introduction The conflict between resources and the environment has been increasingly outstanding as the population,economy and society around the globe have developed rapidly since the 21st century.An important challenge that the human
文摘According to the Geological settings and the distributed laws of ore bodies and previous research re- suits, combining with latest theories and new methods of geological prospecting, the authors proposed prospec- ting thoughts for substituted resources in Laozuoshan gold deposit. After ore prospecting in two years, nine new blind ore bodies were found, among which four ore bodies contain 4218. 1 kg inferred intrinsic economic re- sources （ 333 ）, and mitigate the crisis situation of mine reserves. At the same time, lots of significant geophysi- cal and geochemical anomalies were found in the peripheral, which provide a basis for further prospecting.
基金co-funded by National Science and Technology Major Special Project (Grant No.2011ZX05018-001 and 2011ZX05028-002)PetroChina Co. Ltd. Project (Grant No.2011D-5002-02, 2014E-050202)
文摘The presence of shale gas has been confirmed in almost every marine shale distribution area in North America.Formation conditions of shale gas in China are the most favorable for marine,organic-rich shale as well.But there has been little research focusing on shale gas in Qiangtang Basin,Qinghai-Tibet Plateau,where a lot of Mesozoic marine shale formations developed.Based on the survey results of petroleum geology and comprehensive test analysis data for Qinghai-Tibet Plateau,for the first time,this paper discusses characteristics of sedimentary development,thickness distribution,geochemistry,reservoir and burial depth of organic-rich shale,and geological conditions for shale gas formation in Qiangtang Basin.There are four sets of marine shale strata in Qiangtang Basin including Upper Triassic Xiaochaka Formation （T3x）,Middle Jurassic Buqu Formation （J2b）,Xiali Formation （J2x） and Upper Jurassic Suowa Formation （J3s）,the sedimentary types of which are mainly bathyal-basin facies,open platform-platform margin slope facies,lagoon and tidal-fiat facies,as well as delta facies.By comparing it with the indicators of gas shale in the main U.S.basins,it was found that the four marine shale formations in Qiangtang Basin constitute a multi-layer distribution of organic-rich shale,featuring a high degree of thickness and low abundance of organic matter,high thermal evolution maturity,many kinds of brittle minerals,an equivalent content of quartz and clay minerals,a high content of feldspar and low porosity,which provide basic conditions for an accumulation of shale gas resources.Xiaochaka Formation shale is widely distributed,with big thickness and the best gas generating indicators.It is the main gas source layer.Xiali Formation shale is of intermediate thickness and coverage area,with relatively good gas generating indicators and moderate gas formation potential.Buqu Formation shale and Suowa Formation shale are of relatively large thickness,and covering a small area,with poor gas generating indicators,and limited gas formation potential.The shale gas geological resources and technically recoverable resources were estimated by using geologic analogy method,and the prospective areas and potentially favorable areas for Mesozoic marine shale gas in Qiangtang Basin are forecast and analyzed.It is relatively favorable in a tectonic setting and indication of oil and gas,shale maturity,sedimentary thickness and gypsum-salt beds,and in terms of mineral association for shale gas accumulation.But the challenge lies in overcoming the harsh natural conditions which contributes to great difficulties in ground engineering and exploration,and high exploration costs.
