Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (6): 27-36.doi: 10.12108/yxyqc.20180604

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Sensitivity of tight sandstone reservoir of Bashijiqike Formation in Keshen area, Tarim Basin

REN Dazhong1,2, ZHANG Hui3, ZHOU Ran4, WANG Qian4, HUANG Hai1,2, TANG Shenglan3, JIN Na4   

  1. 1. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi'an 710065, China;
    2. College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    3. Research Institute of Oil/gas Engineering, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    4. Drilling and Production Technology Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Xi'an 710021, China
  • Received:2018-04-12 Revised:2018-07-18 Online:2018-11-16 Published:2018-11-16

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Abstract: Natural productivity of tight sandstone reservoir is lower than that of conventional reservoir and improving the injection method of water flooding is able to enhance oil and gas production efficiently. Thus, the control of physicochemical index and injection parameters of fluid is vital for reasonable and effective reservoir development. Taking tight sandstone reservoir of Cretaceous Bashijiqike Formation in Keshen area of Tarim Basin as an example, the data of casting thin slices, scanning electron microscope, X-ray diffraction and high-pressure mercury injection test were used to conduct reservoir classification based on pore structure. Typical samples were selected to carry out sensitivity evaluation experiments, and the factors affecting the sensitivity of different types of reservoirs were analyzed. The results show that the reservoirs can be divided into three types according to the types of pore assemblages:residual intergranular pores, dissolved pores and microfractures, and the effective reservoir space decreased in turn. The reservoirs have the characteristics of strong water sensitivity, velocity sensitivity and alkali sensitivity, medium-strong saline sensitivity and medium acid sensitivity. The sensitivity is closely related to the sensitivity of reservoir debris and clay minerals. Only samples with high contents of illite can enhance the velocity sensitivity and water sensitivity, alkali sensitivity is controlled by selective dissolution of quartz, and high content of zeolite is an important factor for improving reservoir acid sensitivity. Different types of reservoirs respond differently to the sensitivity. The sensitivity of residual intergranular reservoirs is less affected by pore structure. The throats of dissolved pore reservoirs and micro-fractured reservoirs are more likely to be filled, resulting in a significant decrease in seepage capacity. The research results can provide reference for the effective development of tight sandstone reservoirs.

Key words: tight sandstone, pore structure, reservoir sensitivity, Bashijiqike Formation, Tarim Basin

CLC Number: 

  • TE122.2
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