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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(1): 112-119
Dong Xiufang, Xiong Yongxu. ON THE TYPE OF THE YINING BASIN AND ITS SIGNIFICANCE OF PETROLEUM GEOLOGY[J]. PETROLEUM GEOLOGY & EXPERIMENT, 1995, 17(1): 17-25. doi: 10.11781/sysydz199501017
Citation: Zhang Hao, Chen Gang, Zhu Yushuang, Dang Yongchao, Chen Juan, Wang Hengli, Si Yang, Bai Chao, Li Xue. Quantitative characterization of microscopic pore throat structure in tight sandstone oil reservoirs:A case study of Chang7 reservoir in Xin'anbian oil field, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(1): 112-119. doi: 10.11781/sysydz201701112
shu

Quantitative characterization of microscopic pore throat structure in tight sandstone oil reservoirs:A case study of Chang7 reservoir in Xin'anbian oil field, Ordos Basin

doi: 10.11781/sysydz201701112
  • 1.

    State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an, Shaanxi 710069, China

  • 2. The 1 st Oil Production Factory, Changqing Oilfield Branch Company, PetroChina, Yan'an, Shaanxi 716000, China

  • 3. Research Institute of Exploration and Development, Changqing Oilfield Branch Company, PetroChina, Xi'an, Shaanxi 710069, China

  • 4. Chuanqing Drilling Engineering Company, Institute of Engineering Technology, PetroChina, Xi'an, Shaanxi 710018, China

  • Received Date: 2016-07-11
  • Rev Recd Date: 2016-11-28
  • Publish Date: 2017-01-28
    Abstract
  • The Chang7tight sandstone oil reservoir in the Xin'anbian oil field in the Ordos Basin has good potential for hydrocarbon exploration. However, the studies of microscopic pore throat structure were limited, which restricted tight oil exploration and long-term development. Size, shape and spatial distribution of pore throats in tight oil reservoirs were studied in this paper by using scanning electron microscope (SEM), casting thin section, high-pressure mercury injection and Nano-CT technologies. Pores in the Chang7tight oil reservoir in the Xin'anbian oil field were divided into three categories, namely intergranular pores, dissolution pores and microfractures. A large number of nanoscale pore throats developed in this area, which contributed to reservoir capacity and permeability. Pore throat distributions on capillary pressure curves of different samples showed that when threshold pressure is less than 1MPa, there are many micron-sized pores with a good connectivity and pore throats are large tubular and striped with throat diameters being in the range of 100-380nm. When the threshold pressure ranges from 1to 3MPa, there are many nanoscale pores with a good connectivity locally, intragranular dissolution pores are developed and pore throats are tube bundle and spherical shape with throat diameter being in the range of 75-250nm. When the threshold pressure is greater than 3MPa, small isolated spherical nanopores occur, leading to a poor vertical connectivity, only local micro-fracture development provides storage space, and throat diameter is concentrated in the range of 15-75nm.

     

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      沈阳化工大学材料科学与工程学院 沈阳 110142

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