Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 108-116.doi: 10.3969/j.issn.1673-8926.2017.04.013

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Log calculation method of geochemical parameters of lacustrine shale and its application:a case of lower Es3 in Bonan subsag,Zhanhua Sag

YAN Jianping1,2, LIANG Qiang1,3, GENG Bin4, FENG Chunzhen5, KOU Xiaopan5, HU Yong5   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Sichuan Key Laboratory of Natural Gas Geology, Chengdu 610500, China;
    3. PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    5. Changqing Division of PetroChina Logging Company, Xi'an 718500, China
  • Received:2016-11-23 Revised:2017-02-03 Online:2017-07-21 Published:2017-07-21

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Abstract: The Geochemical index is an important parameter in the study of source rock and unconventional shale oil and gas, and it is of great significance for evaluating hydrocarbon potential of source rocks and reservoir effectiveness. The classic Passey formula was used to calculate the TOC content of lacustrine shale of the lower third member of Shahejie Formation(Es3)in Bonan subsag of Zhanhua Sag, but the error is larger. Through the analysis of the relationship between TOC and log response, it is found that TOC has a good correlation with tripo-rosity curve. The TOC calculation model was established on account of different lithologies(oil mudstone, mudstone and oil shale), and the calculation accuracy was obviously improved. The calculation models of pyrolysis hydrocarbon(S2), hydrogen index(HI)and maximum pyrolysis temperature(Tmax)were established indirectly by TOC and depth variables, and then the kerogen types and organic matter abundance were quantitatively evaluated by using the data of continuous HI, Tmax and TOC. Finally, combining with the information of mineral composition and physical properties obtained from well log data, the shale lithofacies were identified effectively, which is abundant of type Ⅰ and Ⅱ1 kerogen. This result provides a theoretical basis for the favorable reservoir prediction of lacustrine shale in Bonan subsag.

Key words: shallow-water meandering river delta, distributary channel, Jizhong Depression, the first member of Shahejie Formation, Zhaohuangzhuang-Suning area

CLC Number: 

  • TE132.2
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