The enrichment model of organic matter in the coastal detention environment： Case study of the Qiongzhusi Formation in the Gecun section of Ebian in southwestern Sichuan Basin
Received date: 2021-07-05
Revised date: 2021-09-13
Online published: 2022-04-22
Supported by
The National Science and Technology Major Project of China(2017ZX05036003-007)
The Qiongzhusi Formation in the Upper Yangtze area is one of the key formations for shale gas exploration in the Sichuan Basin， China. At present， the research on the organic matter enrichment of the fine-grained sedimentary rocks of the Qiongzhusi Formation focuses on the deep-water shelf environment in the Mianyang-Changning elongated trough. There are few studies on the organic matter enrichment in the coastal shallow water environment in southwestern Sichuan Basin. This study takes the Gecun section of Ebian as an example. Through section and thin section observation， X-ray diffraction analysis， organic geochemical test， element geochemical analysis， etc.， the ancient sedimentary environment in the area was restored and the main controlling factors of organic matter enrichment in the study area were explored. The results of the study show that organic-rich mud shale is developed in the Qiongzhusi Formation in Ebian area， and the enrichment of organic matter is the result of the coordinated effect of paleo-climate， paleo-productivity and oxygen reduction properties of the water. The key reason of the enrichment of organic matter is the change of paleo-water depth. The warmer climate and the rise of paleo-water depth during the late deposition period of Qiongzhusi Formation promoted the prosperity of organisms and the increase of ancient productivity. Paleo-water depth changes have successively led to the formation of water stratification and the formation of detaining environments， which further improved the reducibility of sedimentary water bodies. Research suggests that the late deposition period of Qiongzhusi Formation in southwestern Sichuan is conducive to the enrichment of organic matter， the organic-rich mud shale section in the riparian facies retention environment developed during the paleo-water depth rise and fall. Based on these studies， the organic matter enrichment model in the riparian environment was established.
Yilin LI , Meiyan FU , Hucheng DENG , Sibing LIU , Wang XU , Dong WU . The enrichment model of organic matter in the coastal detention environment： Case study of the Qiongzhusi Formation in the Gecun section of Ebian in southwestern Sichuan Basin[J]. Natural Gas Geoscience, 2022 , 33(4) : 588 -604 . DOI: 10.11764/j.issn.1672-1926.2021.10.003
感谢三位匿名审稿专家的意见和认真指导！同时也感谢四川省煤田地质局科源测试中心提供的实验条件！
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