Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 83-95.doi: 10.12108/yxyqc.20190210

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Characteristics and controlling factors of organic matter enrichment of Lower Carboniferous black rock series deposited in inter-platform region,Southern Guizhou Depression

DING Jianghui1,2,3, ZHANG Jinchuan1,2, LI Xingqi1,2, LANG Yue1,2, ZHENG Yuyan1,2, XU Longfei1,2   

  1. 1. School of Energy and Resources, China University of Geosciences, Beijing 100083, China;
    2. Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Land and Resources, Beijing 100083, China;
    3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
  • Received:2018-10-26 Revised:2018-12-25 Online:2019-03-21 Published:2019-03-21

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Abstract: Organic matter is well developed in the Lower Carboniferous black rock series deposited in an interplatform region,Southern Guizhou Depression. In order to clarify the characteristics and controlling factors of organic matter enrichment in such a setting,a case study was carried out from a newly-cut roadside outcrop,by conducting total organic carbon (TOC) test,argon ion polishing-scanning electron microscopy (SEM) analysis, major and trace element tests. The results show that:(1) TOC contents of the investigated samples of Datang Formation in Southern Guizhou Depression range from 0.90% to 2.83%,with an average of 1.45%,displaying cyclic fluctuations being in accordance with the stratigraphic cycle. (2) Both the relatively low U,V and Mo concentrations and framboidal pyrite diameter mostly more than 5 μm,together with EFU-EFMo covariations and multiple redox-sensitive indicators such as U/Th, V/Cr and Ni/Co,indicate an oxic and/or dysoxic water environment in Southern Guizhou Depression during the Early Carboniferous period,which is usually considered unfavorable for organic matter accumulation and preservation. Because the water depth in the inter-platform region is relatively shallow,some organisms cannot be oxidized or degraded through rapid burial,further promoting organic matter enrichment. (3) There is no obvious correlation between TOC and U/Th, V/Cr and Ni/Co. Of the aspects that might affect organic matter enrichment,including redox conditions,paleoproductivity,and terrigenous clastic input,the paleoproductivity seems to be the dominant controlling factor. This is strongly supported by the positive correlation between Mo and TOC contents. Also,terrigenous clastic inputs have a certain dilution effect on the organic matter content. (4) The organic matter enrichment in Southern Guizhou Depression arose dominantly from increased organic carbon export with enhanced nutrient fluxes owning to the regional sea level rising during the Early Carboniferous period. The research results would provide guidance for the study of organic matter enrichment patterns and shale gas accumulation conditions in the marine-continental transitional coal-bearing strata and medium and small-sized coal-bearing basins.

Key words: organic matter, redox conditions, paleoproductivity, Datang Formation, inter-platform region, Southern Guizhou Depression

CLC Number: 

  • TE122.2
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