Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 124-133.doi: 10.12108/yxyqc.20190214

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Multi-scale discrete fracture modeling technology for carbonate reservoir of Longwangmiao Formation in Moxi area and its application

WANG Bei1,2, LIU Xiangjun1, SIMA Liqiang1, XU Wei2, LI Qian2, LIANG Han2   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China
  • Received:2018-09-19 Revised:2018-11-25 Online:2019-03-21 Published:2019-03-21

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Abstract: In fractured-cavern carbonate gas reservoirs with highly deviated wells and horizontal wells as the main development wells,it is difficult to obtain the fracture occurrence at different spatial locations of well points,and the precise description of fractures is inaccurate,which all influence the characterization of seepage channels in gas reservoirs and restrict the scientific and balanced development of edge water gas reservoir. Taking carbonate reservoir of Longwangmiao Formation in Moxi area as an example,based on qualitative identification of fractures in highly deviated wells and horizontal wells,the data of core photos,FMI imaging logging,prestack seismic anisotropic fracture prediction and discontinuity detection,dynamic monitoring,were used to quantitatively characterize the fracture occurrence,opening,density and porosity. Then combined with the obtained fracture parameters,a multi-scale unstructured grid discrete fracture model was establish to determine the regional distribution of high and low permeability gas reservoir,dominant water invasion channels and water invasion patterns. The results show that the large-scale and small-scale fractures are well developed in the discrete fracture model of gas reservoir in Longwangmiao Formation,and the high permeability zones are widely distributed in the form of continuous flakes. There are nine high permeability channels with edge water invasion developed in four directions around the gas reservoir,in which there are two types of water invasion:water channeling along fractures and uniformly advancing along dissolved cavities. This method and research results have reference significance for theoretical and technical research of the same super-large overpressure deep carbonate gas reservoirs, such as fine description of the fractures,characterization of the dominant channel of water invasion and establishment of water invasion model.

Key words: highly deviated wells and horizontal wells, fracture identification, DFM fracture modeling, distribution of high and low permeability zones, water invasion dominant channel, water invasion pattern, Sichuan Basin

CLC Number: 

  • TE319
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