Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (2): 9-14.doi: 10.3969/j.issn.1673-8926.2014.02.002

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Controlling factors for natural productivity of the second member of Toutunhe Formation in eastern Fukang slope, Junggar Basin

WEN Huaguo1， JIA Bin1， JIANG Yiqin2， JIN Jun2， QI Liqi2， LI Lulu2   

  1. 1. Institute of Sedimentary Geology， Chengdu University of Technology， Chengdu 610059， China； 2. Research Institute of Experiment and Detection， PetroChina Xinjiang Oilfield Company， Karamay 834000， Xinjiang， China
  • Online:2014-04-06 Published:2014-04-06

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Abstract:

The Toutunhe Formation in eastern Fukang slope is one of the most important exploration layers of lithologic traps for Xinjiang Oilfield Company. Most drilling oil production tests show that the reservoir of the second member of Toutunhe Formation is high yield oil layer. However, if they were reformed by fractures, the oil yield decreased rapidly, even cannot see any oil, which restricts the further exploration in reservoir to some extent. Therefore, it is of importance and urgency to analyze how the fracture can make natural productivity differently. Trough the comprehensive research of drilling, logging, lithology, oil production test and analysis assay data, this paper suggested that: sedimentary microfacies, contents of tuffaceous fragments, relative content of clay minerals, radius of pore throat, reservoir sensitivity and strata pressure are the key factors to control reservoir natural productivity of single well in Fudong slope. High content of illite and smectite mixed layer coating, which weakens the water sensitivity damage, the weak acid and velocity sensitivity, and the average radius of the pore throat, those are the main reasons caused the high productivity in the second member of Toutunhe Formation in eastern Fukang slope. This study will provide important theoretical foundation and production instruction for the further lithologic reservoir exploration of Toutunhe Formation in eastern Fukang slope.

Key words: lacustrine source rocks, microscopic characteristics, forming mechanism, Biyang Sag

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