Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 106-112.doi: 10.3969/j.issn.1673-8926.2017.05.012

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Fractal characteristics of tight sandstone reservoir using mercury intrusion capillary pressure:a case of tight sandstone reservoir in Jizhong Depression

GE Xiaobo1,2, LI Jijun1, LU Shuangfang1, CHEN Fangwen1, YANG Dexiang3, WANG Quan3   

  1. 1. Unconventional Oil & Gas and Renewable Energy Research Institute, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China;
    3. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2017-01-20 Revised:2017-03-06 Online:2017-09-21 Published:2017-09-21

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Abstract: To evaluate the type of tight sandstone reservoir and provide theoretical basis for the exploration and development of tight oil and gas,the fractal theory,mercury intrusion capillary pressure analyses,as well as reservoir physical properties,were used to discuss the pore structure characteristics of tight sandstone reservoir in Jizhong Depression,by analyzing 11 tight sandstone samples. The results show that an evaluation method for fracture(>10 μm,in diameter),macropores(1-10 μm),mesopores(0.1-1.0 μm)and micropores(< 0.1 μm)within tight sandstone reservoir was established by mercury intrusion curves. This method was verified using fractal geometry theory. Based on the above classification,the volume contents of pores and fractures were estimated by mercury intrusion curves. Morever,three types(Ⅰ,Ⅱ and Ⅲ)of tight sandstone reservoir in Jizhong Depression were analyzed based on the distribution of pore volume,porosity,permeability,displacement pressure and mercury withdrawal efficiency. Type I tight sandstone reservoir is characterized by abundant micropores and rarely open fractures,which leads to a low permeability. Type Ⅱ tight sandstone reservoir has high open fractures but a few micropores. Type Ⅲ tight sandstone reservoir not only has abundant micropores but also has high open fractures. Two main parameters obtained from the mercury porosimetry analysis, the mercury withdrawal efficiency and permeability,reflect the totally minable potential and production rate of tight oil and gas,respectively. The more the micropores develop,the higher the mercury withdrawl efficiency is,and the simpler and more homogeneous the pore structure is. The flowing capacity is controlled by fractures and macropores. Therefore,the type Ⅲ tight sandstone reservoir in Jizhong Depression is the most appropriate to exploit.

Key words: sedimentary facies, dissolution zone, favorable reservoirs, Cretaceous Xiagou Formation, Ya'erxia area

CLC Number: 

  • TE122
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