四川盆地剑阁地区须家河组致密砾岩储层裂缝特征及对天然气产能的影响

doi:10.11743/ogg20200305

Abstract

Abstract: Natural fractures are important storage space and main seepage channels in tight conglomerate reservoirs,which function to influence the accumulation,enrichment and single-well productivity of tight gas.An integration of analogous outcrop,core,thin section,well log and production data,is applied to the study on the types and characteristics of natural fractures in the tight conglomerate reservoir of the Upper Triassic Xujiahe Formation in Jian'ge area,Sichuan Basin,and then the influence analysis of natural fractures on tight gas productivity.Trans-gravel,intra-gravel and gravel-edge fractures are developed in the tight conglomerate reservoirs.In terms of geological origin,trans-gravel fractures are tectonic fractures; intra-gravel fractures include tectonic,tectonic-diagenetic and parent-rock fractures; and gravel-edge fractures are tectonic-diagenetic fractures.Among others,trans-gravel fractures are the largest in areal density,porosity and permeability,followed by intra-gravel fractures and gravel-edge ones.Thus,the trans-gravel fractures are more contributive to the formation of the tight conglomerate reservoirs,and the most conducive to natural gas enrichment with high yield.The degree of fracture development is positively correlated with gas production:the greater the fracture density is,the greater the tight gas productivity could be.Under the present-day in-situ stress trending towards the nearly east-west (EW) to NWW-SEE direction,the contributions made by fractures of diverse directions are differential on the tight gas productivity.The nearly EW-trending fractures feature bigger apertures and good connectivity,being the most favorable area for tight gas production,followed by nearly NS- and NW-SE-trending fractures,and then the NE-SW-trending ones.

Key words: productivity, natural fracture, tight conglomerate reservoir, Xujiahe Formation, Jian'ge area, Sichuan Basin

CLC Number:

TE122.2

Lyu Wenya, Miao Fengbin, Zhang Benjian, Zeng Qi, Xu Xiang, Ji Min. Fracture characteristics and their influence on natural gas production: A case study of the tight conglomerate reservoir in the Upper Triassic Xujiahe Formation in Jian'ge area,Sichuan Basin[J]. Oil & Gas Geology, 2020, 41(3): 484-491,557.

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Fracture characteristics and their influence on natural gas production: A case study of the tight conglomerate reservoir in the Upper Triassic Xujiahe Formation in Jian'ge area,Sichuan Basin

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