Petroleum Science > 2019(1 ) :44-57 DOI:
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 Open Access
文章信息
作者：Guanyinqiao Formation, Sichuan Basin, Mudstone, Laminated mudstone, Water condition
作者单位：Lei Yang, Bo Ran, Yu-Yue Han, Shu-Gen Liu, Yue-Hao Ye, Christopher Xiao, Wei Sun, Di Yang, Guo-Dong Xia and Shi-Yu WangSchool of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China,University of Houston, 4800 Calhoun Rd, Houston, TX 77004, USA,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China and Research Institute of Yanchang Petroleum (Group) Co. Ltd, Xi’an 710075, Shaanxi, China
收稿日期：
出版日期：2018-05-31 00:00:00.0
引用方式：
文章摘要
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.
英文关键词
-
Guanyinqiao Formation, Sichuan Basin, Mudstone, Laminated mudstone, Water condition