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Sedimentary environment controls on the accumulation of organic matter in the Upper Ordovician Wufeng–Lower Silurian Longmaxi mudstones in the Southeastern Sichuan Basin of China

查看全文 作　　者：Lei [1]Yang;Bo [2]Ran;Yu-Yue [2]Han;Shu-Gen [2]Liu;Yue-Hao [2]Ye;Christopher [3]Xiao;Wei [2]Sun;Di [2]Yang;Guo-Dong [2]Xia;Shi-Yu [4]Wang 高影响力作者 机构地区：[1]School of Earth Sciences and Resources, China University of Geosciences;[2]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology;[3]University of Houston;[4]Research Institute of Yanchang Petroleum (Group) Co.Ltd高影响力机构 出　　处：《Petroleum Science》索引2019年第16卷第1期,共14页高影响力期刊 基　　金：supported by the Science and Technology Support Program of Sichuan Province(No.15ZC1390);National Natural Science Foundation of China(No.41102064) 摘　　要：The Upper Ordovician–Lower Silurian mudstones(including the Wufeng, Guanyinqiao and Longmaxi Formations) in the Sichuan Basin are some of the most important shale gas plays in China. In order to enhance our understanding of the process of formation of organic carbon up to 10%, optical, microscopy and geochemical methods have been used to investigate the petrographic and geochemical characteristics of the formation. Firstly, three mudstone lithofacies were identified based on a wide variety of mudstone laminations. These are:(a) indistinctly laminated mudstone;(b) parallellaminated mudstone; and(c) nonparallel-laminated mudstone. Then, combining with the evidence from depocenter migration, Th/U ratios and total organic carbon, the abundant organo-minerallic fabrics suggest that organic carbon was preferentially deposited and preserved in anoxic, low energy and stagnant water conditions during deposition of the Wufeng and Longmaxi Formations. On the contrary, the Guanyinqiao Formation with poor organic carbon was deposited in oxic and high-energy water conditions. 关 键 词：Guanyinqiao Formation SICHUAN Basin MUDSTONE LAMINATED MUDSTONE Water condition
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