川中广安须家河气藏气、水分布

doi:10.11743/ogg20090610

Abstract

Abstract:

The gas reservoirs in the Xujiahe Formation,Guang'an area,central Sichuan Basin,are porous-litho-logic tight gas reservoirs.Production test data of 78 wells in the area were analyzed and the following conclusions were obtained.Pore throats in these reservoirs form the main carrier system during the pooling process,and the migration,accumulation and distribution of gas and water is controlled by the physical properties and heteroge-neity of these reservoirs.Gas accumulation is affected by the structures during the later reformation of these reservoirs,and the relatively low amplitude of the structures causes the poor gas-water differentiation,thus water production is common in the gas wells there.The gas reservoirs can be divided into three zones(primary gas zone,secondary gas zone,and gas-water zone) according to the gas and water distribution.Three patterns of gas and water distribution are correspondingly proposed,namely highly permeable zone pattern,single sandbody pattern and micro-fracture-controlling pattern.

Key words: water-gas differentiation, pooling process, porous-lithologic tight gas reservoir, Xujiahe Formation, central Sichuan Basin

CLC Number:

TE122

Fan Ru, Shao Hui, Jia Ailin, He Dongbo, Zhang Xuelei, Deng Shenghui, Wei Yunsheng, Ji Lidan, Cheng Taotao. Gas and water distribution in gas reservoirs of the Xujiahe Formation,Guang'an area,the central Sichuan Basin[J]. Oil & Gas Geology, 2009, 30(6): 732-739.

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Gas and water distribution in gas reservoirs of the Xujiahe Formation,Guang'an area,the central Sichuan Basin

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