Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 95-106.doi: 10.12108/yxyqc.20210509

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Identification and distribution characteristics of coal-bearing source rocks in Pingbei area,Xihu Sag

ZHAO Jing1,2, HUANG Zhilong1,2, LIU Chunfeng3, LI Tianjun1,2, JIANG Yiming3, TAN Sizhe3, HUANG Jun3, GUO Xiaobo4   

  1. 1. School of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Shanghai Branch of CNOOC Limited, Shanghai 200030, China;
    4. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China
  • Received:2020-11-16 Revised:2021-03-28 Online:2021-10-01 Published:2021-09-30

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Abstract: The coal-bearing source rocks of Pinghu Formation in Pingbei area, Xihu Sag, have three kinds of lithology:coal, carbonaceous mudstone and mudstone. In order to clarify the development and distribution characteristics of various coal-bearing source rocks, and determine the key factors for the development of high-quality source rocks, through the analysis of geochemical characteristics and the evaluation of effective source rocks of coal-bearing source rocks in Pingbei area, the lithologic logging identification model was established. Combined with the prediction results of lithology distribution and TOC content of mudstone, the development characteristics and distribution law of coal-bearing source rocks in study area were clarified. The results show that:the coal and carbonaceous mudstone of Pinghu Formation are high quality source rocks, and the mudstone with w(TOC) >1.0% are effective source rocks. Organic matter types of coal-bearing source rocks are mainly Ⅱ-Ⅲ types, generally reaching low maturity to maturity stage. The distribution of coal-bearing source rocks is obviously controlled by Paleo water depth. Transgression occurred in the middle part of sedimentary period of Pinghu Formation, is conducive to the development of coal-bearing source rocks. The sedimentary centers of coal are mostly distributed in the depression between uplifts;besides, the carbonaceous mudstone and coal have symbiotic relationship. The effective mudstone thickens with the increase of water depth. The Paleotopography and the active rate of growth faults in Pingbei area affect the local water bodies, which are the key factors for the development of high-quality coal-bearing source rocks. The research results have guiding significance for hydrocarbon generation potential evaluation and favorable area prediction in Pingbei area, Xihu Sag.

Key words: coal-bearing source rocks, identification and distribution, Pinghu Formation, Xihu Sag

CLC Number: 

  • TE112.11
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