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Sedimentary Environment and Accumulation Pattern of Organic Matter in Wufeng-Longmaxi Formations in the Southwestern Sichuan, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第05期
Page:
1227-1245
Research Field:
庆贺汤中立院士从事地质工作七十周年专辑
Publishing date:

Info

Title:
Sedimentary Environment and Accumulation Pattern of Organic Matter in Wufeng-Longmaxi Formations in the Southwestern Sichuan, China
Author(s):
CAO Guang-yao1; 2;  LIU Yu1; 2; 3*;  ZHOU Xiao-lin4; 5; 6;  LI Yuan-chun1; 2
(1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. International Center for Sedimentary Geochemistry and Biogeochemistry Research, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 3. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 4. Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China; 5. Key Laboratory of Sedimentary Basin and Oil and Gas Resources of Ministry of Natural Resources, Chengdu 610081, Sichuan, China; 6. Sedimentary Geology Research Center, China Geological Survey, Chengdu 610081, Sichuan, China)
Keywords:
paleo-ocean;  sedimentary environment;  black shale;  Wufeng Formation;  Longmaxi Formation;  redox condition;  organic matter accumulation;  Sichuan
PACS:
P595; P618.13
DOI:
10.19814/j.jese.2022.11040
Abstract:
In order to find the evolution characteristic of sedimentary environment and main controlling factors of organic matter in Wufeng-Longmaxi Formations organic-rich shale in the southwestern Sichuan, the vertical variations of total organic carbon(TOC), and contents of major and trace elements in Wufeng-Longmaxi Formations in well YD1 were obtained by element geochemistry and organic geochemistry; and the paleo-environment evolution characteristic and organic matter accumulation mechanism of Wufeng-Longmaxi Formations were discussed. The results show that TOC of Longmaxi Formation with the average of 4.50% is higher than that of Wufeng Formation with the average of 1.26%. The geochemical indices(V/Cr, Corg/P, Mo content and Mo/TOC)indicate that the sedimentary environment of Wufeng-Longmaxi Formation is in a moderate to strong limitation, and the seawater undergoes from oxic-suboxic(the averages of V/Cr, Corg/P and Mo content of Wufeng Formation are 3.39, 138.16 and 4.28×10-6)to anoxic sulfide(the averages of V/Cr, Corg/P and Mo content of Longmaxi Formation are 6.71, 249.38 and 61.49×10-6). The paleoproductivity indices((Ni+Cu)/Al and contents of Ni and Babio)indicate that Wufeng-Longmaxi Formations have relatively high productivity levels, which is mainly attributed to the input of rich nutrients caused by frequent volcanic activities and the development of upwelling in the same period. According to the correlation analysis of TOC with continental input indices, redox indices and paleoproductivity indices, it is found that the organic matter accumulation of Wufeng and Longmaxi Formations are controlled by the redox conditions; organic preservation of Wufeng Formation is suppressed by oxic-suboxic condition; intense anoxic condition and high productivity contribute to the high organic matter content, making Longmaxi Formation conducive to shale gas development.

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Last Update: 2023-10-15