Depositional environments and mechanism of differential organic matter enrichment for shale of the Lower Jurassic Quse Formation in Qiangtang Basin,Tibet
ZHENG Mingyu1,2,3, MA Yiquan1,2,3, WEN Huaguo1,2,3
1 Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources,Chengdu University of Technology,Chengdu 610059,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 3 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China
Abstract：The Lower Jurassic Quse Formation in the Qiangtang Basin is an important source rock series in the basin. However,a systematic study on the mechanism of organic matter enrichment in this source rock is still lacking,which limits the understanding of the material basis of hydrocarbon accumulation in this area. In this paper,the 100-meter thick organic matter-rich shale of the Lower Jurassic Quse Formation in the Biluoqiao area of the South Qiangtang Depression is used as a study subject. we systematically investigated the the palaeoenvironmental and palaeoclimatic characteristics of shale at the time of deposition,analyzed the main controlling factors of the organic matter enrichment in the shale,and established models of differential organic matter enrichment in the shale of Quse Formation based on the integrated core,TOC,major and trace elements data. The results show that the shale can be divided into two intervals by the organic matter content which increased upward at both intervals. The lower interval(59~110 m)had a generally low organic matter content(the TOC contents range from 0.3% to 8.1%,with an average of 2.7%),and contained three thin organic matter-rich intervals. However,the organic matter content in the upper interval(0~59 m)was relatively high(the TOC contents range from 0.8% to 16%,with an average of 4.9%). The deposition of Quse Formation generally occurred in a humid environment,and was influenced by hydrothermal processes. The organic matter enrichment in the lower interval was mainly related to moderate terrestrial inputs,redox conditions and palaeoproductivity,and the organic matter enrichment in the upper interval was mainly controlled by redox conditions and palaeoproductivity. The difference in the organic matter enrichment mechanism between the upper and lower intervals of the Quse Formation may be closely related to the driving forces of palaeoclimate and sea level changes.
ZHENG Mingyu,MA Yiquan,WEN Huaguo. Depositional environments and mechanism of differential organic matter enrichment for shale of the Lower Jurassic Quse Formation in Qiangtang Basin,Tibet[J]. JOPC, 2024, 26(5): 1127-1139.
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