川中广安须家河气藏气、水分布

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

樊茹 邵辉 贾爱林 何东博 张学磊 邓胜徽 位云生 季丽丹 陈涛涛

Fan Ru Shao Hui Jia Ailin He Dongbo Zhang Xuelei Deng Shenghui Wei Yunsheng Ji Lidan Cheng Taotao

川中广安须家河气藏为孔隙-岩性型致密气藏。根据78口试采井数据分析,认为储层的孔喉构成了成藏过程中主要的疏导体系,储层物性及非均质性控制气、水的运聚和分布;构造在气藏后期改造中影响天然气的聚集,较低的构造幅度致使气、水分异差,气井普遍产水。气藏内可划分出富气区、次富气区及气、水同产区3类气水分布区,相应地提出高渗透带、单砂体及微构造控制的3种气、水分布模式。

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.

10.11743/ogg20090610