Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 152-162.doi: 10.12108/yxyqc.20220214

• PETROLEUM EXPLORATION • Previous Articles    

Lithofacies and sedimentary environment of shale of Permian Longtan Formation in eastern Sichuan Basin

XIAO Wei1, ZHANG Bing1, YAO Yongjun2, WANG Yan1, YANG Hongyu1, YANG Kai1   

  1. 1. Key Laboratory of Earth Exploration and Information Technology, Ministry of Education, Chengdu University ofTechnology, Chengdu 610059, China;
    2. Chongqing Gas Mine, PetroChina Southwest Oil & Gas FieldCompany, Chongqing 400000, China
  • Received:2021-10-08 Revised:2021-12-20 Online:2022-03-01 Published:2022-03-14

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Abstract: Permian Longtan Formation in eastern Sichuan Basin belongs to transitional-marine strata, with a broad shale gas exploration prospect. According to the mineralogical and petrological characteristics of shale in the study area, the lithofacies was divided, the paleosedimentary environment was reconstructed by using geochemical data, and the controlling factors of organic matter enrichment were discussed. On this basis, the coupling relationship among lithofacies, organic matter enrichment and sedimentary environment was established. The results show that:(1) The shale of Longtan Formation in eastern Sichuan Basin mainly develops four lithofacies:siliceous shale, clay siliceous mixed shale, clay calcareous mixed shale and calcareous siliceous mixed shale. The vertical distribution of lithofacies can be divided into early relatively clay rich stage and late relatively high siliceous content stage.(2) During the early stage of Longtan Formation, the sea level was low, it was mainly in oxidation-suboxidation environment. The average U/Th is 0.42, the average EFMo is 6.66, and the average V(/V+Ni) is 0.77. The paleoproductivity is low and the terrigenous input is large, and the siliceous source was terrigenous transport. During the late stage, the sea level continued to rise, it was mainly in reduction environment. The average U/Th is 5.96, the average EFMo is 148.01, and the average V(/V+Ni) is 0.79, with high paleoproductivity and little terrigenous input, and a large amount of biogenic silicon was enriched.(3) The organic matter enrichment in the sedimentary stage of Longtan Formation have obvious differences, it was jointly affected by terrigenous input and paleoproductivity in the early stage, and a large number of terrigenous higher plant debris were brought in, resulting in a high content of organic carbon. It was controlled by paleoproductivity in the late stage, and the supply of terrigenous debris was weaker than that in the early stage, with organic matter mostly from marine algae.

Key words: shale lithofacies, terrigenous clast, paleoproductivity, organic matter enrichment, Longtan Formation, Permian, eastern Sichuan Basin

CLC Number: 

  • TE122.1
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