Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (4): 970-981.doi: 10.13278/j.cnki.jjuese.20180148

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Evaluation of Hydrocarbon Generation and Geochemical Characteristics of Coal-Measure Source Rocks,Zhongkouzi Basin in Beishan Area

Niu Haiqing1, Han Xiaofeng2, Xiao Bo3, Wei Jianshe2, Zhang Huiyuan2, Wang Baowen2   

  1. 1. Department of Geology, Northwest University, Xi'an 710069, China;
    2. Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China;
    3. No.5 Recovery Plant, Changqing Oilfield Company, CNPC, Xi'an 710200, China
  • Received:2018-06-07 Online:2019-07-26 Published:2019-07-26
  • Supported by:
    Supported by National Natural Science Foundation of China (41330315) and Geological Survey Project of China Geolo-gical Survey (DD20189612, DD20190092)

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Abstract: The Jurassic system of Beishan basin group at the junction of Gansu and Inner Mongolia is a new potential field for oil and gas exploration in Northwest China. On the basis of systematic sample collection,the characteristics of organic matter and biomarker of the Jurassic source rocks in Zhongkouzi basin were analyzed in detail by means of testing technology and geochemical analysis. The results show that the kerogen type of the Jurassic source rocks in the middle mouth basin is mainly typeⅡ1-Ⅱ2, and the source material of hydrocarbon generation is mainly terrestrial plants, containing a small amount of algae and aquatic organisms. It is mainly formed in a weak oxidation-weak reduction sedimentary environment with moderate oxygen content, such as swamps or transgressive lakes in delta plain. According to the evaluation criteria of hydrocarbon generation potential, most of the Jurassic dark mudstones in Heizhangfang sag belong to the source rocks with poor or medium hydrocarbon generating potential. The hydrocarbon generating potential of the dark mudstones in Nanquan sag is medium or high,better than that in Heizhangfang sag. Based on the analytical data in Zhongkouzi basin and the discussion on sedimentary environment and sources of organic matter, the evaluation criteria for hydrocarbon generation potential of source rocks in coal measures are established. This study can provide a comparative reference for the study of the Jurassic sedimentary paleo-environment and resource potential in Northwest China.

Key words: coal-measure source rocks, geochemistry, biological marker compound, hydrocarbon generation potential, Jurassic, Zhongkouzi basin

CLC Number: 

  • P618.13
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