The Distribution and Main Controlling Factors of High-quality Shale in Longmaxi Formation in Southern Sichuan-Eastern Sichuan Region
Sichuan Basin is rich in marine shale gas resources.From Paleozoic to Cenozoic,the basin has experi-enced multiple tectonic movements,forming complex structural styles and variable sedimentary environments,featu-ring with uneven distribution of shale gas resources.In order to clarify the distribution law of high-quality shale,taking the Longmaxi Formation shale in southern Sichuan-eastern Sichuan Region as an example,comprehensive analyses including whole-rock X-ray diffraction,geochemical testing,basin simulation,and drilling and logging data analysis were conducted.The distribution law and main controlling factors of high-quality shale were discussed from the perspectives of sedimentation,reservoir formation,and structure,and favorable areas for shale gas explora-tion and development were delineated.The results show that high-quality shale in the southern Sichuan-eastern Si-chuan Region is mainly distributed in the semi-deepwater to deepwater continental shelf facies;an Ro value of 2.5％to 3.5％is conducive to the development of high-quality shale;and fold structures play a significant control-ling role in the enrichment and distribution of shale gas.The research results can provide theoretical basis for shale exploration and development in southern Sichuan-eastern Sichuan Region.
shalemain controlling factorssedimentary environmentreservoir distributionLongmaxi Formationsouthern Sichuan-eastern Sichuan Region
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