Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 69-75.doi: 10.3969/j.issn.1673-8926.2017.06.009

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Logging identification of effective source rocks in salt-lake facies in western Qaidam Basin

LI Yanli1, WANG Jiangong1,2, SHI Yajun1, ZHANG Ping1, XU Li1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Key Laboratory of Reservoir Characterization, CNPC, Lanzhou 730020, China
  • Received:2017-04-11 Revised:2017-05-22 Online:2017-11-21 Published:2017-11-21

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Abstract: In recent years,a big salt-lake facies self-generation and self-storage reservoir was discovered firstly in upper Xiaganchaigou Formation(E32)in western Yingxiong Mountain of southwestern Qaidam Basin. In order to clear hydrocarbon accumulation mechanism and effectively estimate resources,it is very important to identify and evaluate effective hydrocarbon source rock in salt-lake facies. Based on core observation, geochemical analysis, logging correlation of typical wells,an overlap method of natural gamma ray-resistivity logging curve was established to identify hydrocarbon source rocks and to determine the lithology of hydrocarbon source rock based on geochemical parameters calibration. The logging qualitative and quantitative identification standards in the saltlake facies were determined and applied in Hongshi Depression. The salt-lake facies source rocks in the western Qaidam Basin have strong heterogeneity,only calcareous mudstone with high gamma and high resistivity is effective hydrocarbon source rock. It is simple,effective and accurate to identify source rocks by natural gammaresistivity overlap method. It is of great significance for rapid evaluation and exploration deployment of oil and gas resources in complex lithologic area.

Key words: multi-completion, variable wellbore-rate, model fitting, hydrops nodes selection, critical liquid carrying flow rate, Xihu Sag in the East China Sea

CLC Number: 

  • TE132.2
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