Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (4): 947-958.doi: 10.13278/j.cnki.jjuese.20180049

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Pore Structure Characteristics and Storage-Seepage Capability of Multi-Type Reservoirs in Fracture-Cavity Carbonate Gas Reservoirs: A Case Study of Deng-4 Member in Gaoshiti-Moxi Area, Sichuan Basin

Wang Lu1,2, Yang Shenglai1,2, Peng Xian3, Liu Yicheng3, Xu Wei3, Deng Hui3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Exploration and Development Research Institute of Southwest Oil & Gas Field Company, PetroChina, Chengdu 610041, China
  • Received:2018-03-12 Published:2019-07-26
  • Supported by:
    Supported by National Science and Technology Major Projects of China (2016ZX05015-003) and State Key Basic Research and Development Program ("973" Program) of China (2015CB250900)

Abstract: In order to comprehensively characterize the pore structure and storage-seepage capability of multi-type reservoirs in fracture-cavity carbonate gas reservoirs, a series of test techniques were used to study the samples from the Deng 4 Member in Gaoshiti-Moxi block of Sichuan basin. At first, the lithology, physical property, storage space and throat of the reservoirs were qualitatively described by thin section and scanning electron microscope. Then, the reservoirs were classified according to the capillary pressure curves obtained by high pressure mercury injection. Finally, the two and three dimensional pore structure characteristics of three types of samples were quantitatively determined based on multi-scale CT scans. The study results show that:The storage space is composed of intergranular dissolved pores, intra-granular dissolved pores, inter-crystalline dissolved pores, solution cavities, solution fractures, and structural fractures; the throat type mainly contains necking throat, punctual throat, and control shape throat; the reservoirs can be classified to fracture-cavity type, cavity type, and pore type; in fracture-cavity-type reservoirs, large pores and cavities are developed, uniformly distributed, and connected well,and coarse throats are numerous, micro-fractures and dissolution cavities are beaded in series, which are connected with the isolated storage space and has the best storage and seepage capability; in cavity-type reservoirs multi-scale pores and cavities are developed with strong storage capability, throats are coarse but few and poorly connected with limited seepage capability; in pore-type reservoirs, small pores are developed and unevenly distributed, and most of the spaces are occupied by rock skeleton with few throats and poor connectivity, leading to weak storage-seepage capability.

Key words: pore structure characteristics, fracture-cavity carbonates, multi-type reservoirs, multi-scale CT scans, storage-seepage capability, Sichuan basin

CLC Number: 

  • P618.13
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