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2012•Journal of Henan Polytechnic UniversityRequires access

Geochemical characteristics of carboniferous source rock in Qaidam Basin

Jiang Shengguo

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Abstract

Carboniferous dark mudstone,limestone,coal and carbonaceous mudstone are well developed in Qaidam Basin.Based on the substantial regional geological surveys,studies of the outcrops and geochemical analysis of the organic matter,it indicates that Carboniferous source rocks are mainly dominated by dark mudstone and limestone.The total organic carbon content(TOC) of dark mudstone is between 0.13% and 3.25%,and averagely 1.14%.The organic matter of dark mudstone is mainly of Ⅲ type,and partly II type,which belongs to middle-good source rocks.The TOC content of limestone is between 0.02% and 0.88%,and averagely 0.23%.The organic matter of limestone is mainly of Ⅱtype,which belongs to poor-middle source rocks.Carboniferous source rocks are totally in the maturity and over-maturity stages according to the analyses about vitrinite reflectance(Ro),maximum pyrolysis temperature and biomarkers.In the areas that near the piedmont such as Lianhua Mt.and Dulan,etc,the source rocks occur dynamic metamorphism and have higher thermal evolution stage because of the regional tectonism,and source rocks are in the stage of dry gas generation.However,the vitrinite reflectance(Ro) and maximum pyrolysis temperature of source rocks is medium in the intra-basin areas such as Shihuigou,Chengqianggou,wanggaxiu and Zabusagaxiu,etc,and source rocks are in a peak time of hydrocarbon generation and expulsion.The organic matter source of limestone in the south margin is marine lower hydrobiont.The overall evaluations of carboniferous source rocks show that carboniferous in the area has good prospect for petroleum exploration.Probably,it is the fourth-largest petroleum system following the Eogene period,Jurassic period and Cretaceous period.Especially the Shihuigou area of Delingha Fault-Depression,which is in the Keluke structure,trap is complete,and the area locates in the dominant directional zone of hydrocarbon migration so that it can become the main target for further exploration in Qaidam Basin.

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What this paper is about

Carboniferous dark mudstone,limestone,coal and carbonaceous mudstone are well developed in Qaidam Basin.Based on the substantial regional geological surveys,studies of the outcrops and geochemical analysis of the organic matter,it indicates that Carboniferous source rocks are mainly dominated by dark mudstone and limestone.The total organic carbon content(TOC) of dark mudstone is between 0.13% and 3.25%,and averagely 1.14%.The organic matter of dark mudstone is mainly of Ⅲ type,and partly II type,which belongs to middle-good source rocks.The TOC content of limestone is between 0.02% and 0.88%,and averagely 0.23%.The organic matter of limestone is mainly of Ⅱtype,which belongs to poor-middle source rocks.Carboniferous source rocks are totally in the maturity and over-maturity stages according to the analyses about vitrinite reflectance(Ro),maximum pyrolysis temperature and biomarkers.In the areas that near the piedmont such as Lianhua Mt.and Dulan,etc,the source rocks occur dynamic metamorphism and have higher thermal evolution stage because of the regional tectonism,and source rocks are in the stage of dry gas generation.However,the vitrinite reflectance(Ro) and maximum pyrolysis temperature of source rocks is medium in the intra-basin areas such as Shihuigou,Chengqianggou,wanggaxiu and Zabusagaxiu,etc,and source rocks are in a peak time of hydrocarbon generation and expulsion.The organic matter source of limestone in the south margin is marine lower hydrobiont.The overall evaluations of carboniferous source rocks show that carboniferous in the area has good prospect for petroleum exploration.Probably,it is the fourth-largest petroleum system following the Eogene period,Jurassic period and Cretaceous period.Especially the Shihuigou area of Delingha Fault-Depression,which is in the Keluke structure,trap is complete,and the area locates in the dominant directional zone of hydrocarbon migration so that it can become the main target for further exploration in Qaidam Basin.

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Available abstract

Carboniferous dark mudstone,limestone,coal and carbonaceous mudstone are well developed in Qaidam Basin.Based on the substantial regional geological surveys,studies of the outcrops and geochemical analysis of the organic matter,it indicates that Carboniferous source rocks are mainly dominated by dark mudstone and limestone.The total organic carbon content(TOC) of dark mudstone is between 0.13% and 3.25%,and averagely 1.14%.The organic matter of dark mudstone is mainly of Ⅲ type,and partly II type,which belongs to middle-good source rocks.The TOC content of limestone is between 0.02% and 0.88%,and averagely 0.23%.The organic matter of limestone is mainly of Ⅱtype,which belongs to poor-middle source rocks.Carboniferous source rocks are totally in the maturity and over-maturity stages according to the analyses about vitrinite reflectance(Ro),maximum pyrolysis temperature and biomarkers.In the areas that near the piedmont such as Lianhua Mt.and Dulan,etc,the source rocks occur dynamic metamorphism and have higher thermal evolution stage because of the regional tectonism,and source rocks are in the stage of dry gas generation.However,the vitrinite reflectance(Ro) and maximum pyrolysis temperature of source rocks is medium in the intra-basin areas such as Shihuigou,Chengqianggou,wanggaxiu and Zabusagaxiu,etc,and source rocks are in a peak time of hydrocarbon generation and expulsion.The organic matter source of limestone in the south margin is marine lower hydrobiont.The overall evaluations of carboniferous source rocks show that carboniferous in the area has good prospect for petroleum exploration.Probably,it is the fourth-largest petroleum system following the Eogene period,Jurassic period and Cretaceous period.Especially the Shihuigou area of Delingha Fault-Depression,which is in the Keluke structure,trap is complete,and the area locates in the dominant directional zone of hydrocarbon migration so that it can become the main target for further exploration in Qaidam Basin.

Key concepts: Source rock, Geology, Carboniferous, Maturity (psychological), Geochemistry, Organic matter, Total organic carbon, Coal measures

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