Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 97-108.doi: 10.12108/yxyqc.20200609

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Tight oil accumulation conditions of the second member of Qiketai Formation in Shengbei sub-sag，Turpan-Hami Basin

FENG Yue1,2, HUANG Zhilong1,2, LI Tianjun1,2, ZHANG Hua3, LI Hongwei3, ZHOU Yadong3   

  1. 1. College of Geoscience, China University of Petroleum(Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Research Institute of Exploration and Development, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China
  • Received:2020-03-16 Revised:2020-03-30 Online:2020-12-01 Published:2020-10-30

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Abstract: In order to analyze the conditions and main controlling factors of tight oil accumulation of the second member of Qiketai Formation(J2 q2)in Shengbei sub-sag of Turpan-Hami Basin,and effectively promote the scale effect of tight oil exploration,core and thin section observation,scanning electron microscopy(SEM), high-pressure mercury injection and organic geochemistry analyses were carried out. The results show that:(1)The J2 q2 source rock is a set of low-mature high-quality source rocks,which deposited in a slightly reduced brackish lake environment,the average TOC of source rock is 1.78%,and the organic matter is mainly of type Ⅰ and type Ⅱ1.(2)A set of tight mixed rock reservoir was developed in the middle of the second member of Qiketai Formation,with porosity ranging from 2.6 to 7.7% and the permeability less than 1.0 mD. The overall performance was characterized by medium reservoir pore structure and connectivity. The cut-off pore-throat radius and lower limit of porosity are 50 nm and 2.6%,respectively,and the mobility of tight oil is relatively strong. (3)The distribution of high-quality source rocks,oil-source faults and favorable sedimentary facies belts control the tight oil accumulation,which has the characteristics of "self-source hydrocarbon supply,fault-fracture transportation and reservoir control of favorable facies belt". According to the reservoir controlling factors,two kinds of favorable areas for tight oil exploration can be divided. The research results have important guiding significance for promoting the exploration of tight oil in Shengbei sub-sag of the Turpan-Hami Basin.

Key words: tight oil, accumulation conditions, the second member of Qiketai Formation, Shengbei sub-sag, Turpan-Hami Basin

CLC Number: 

  • TE122.2
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