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沙坪场气田石炭系气藏是西南油气田分公司重庆气矿继五百梯、龙门石炭系气藏之后的又一重要发现 ,它是川气东输工程的骨干气田 ,探明储量近 4 0 0× 10 8m3 ,属大储量气田。据 2 0 0 1年 5月完成的开发方案 ,沙坪场石炭系气藏的生产规模为 13× 10 8m3 /a ,推荐的开发方案能否顺利实施 ,对整个东输工程和该气田的开发至关重要。然而 ,气藏局部出现的边水活跃现象不容忽视 ,在试采期间 ,天东 90井投产仅 17d就开始产地层水 ,且水量迅速增至 98.76m3 /d ,该井见水突然、产水量大 ,在川东石炭系气藏中实属罕见。文章通过剖析沙坪场气田石炭系气藏出水特征 ,结合气藏动、静态研究 ,再借鉴川东其它有水气藏的分析研究成果 ,认为沙坪场石炭系气藏天东 90井出现的早期出水属边水沿裂缝水窜 ,天东 90井附近产层存在大、中裂缝 ,水侵方向来自东翼的沙③号断层 ,但边水能量有限。

Formation Water Characteristics of Carbonic Gas Reservoir in Shapingchang Gas Field

??Carbonic gas reservoir in Shapingchang gas field is another important finding after Wubeiti and Longmen carbonic gas reservoirs by Chongqing gas mine of PCL Southwest Branch.It is the main gas field for gas transmission eastward from Sichuan.Its proved reserves reach to about 400×10⁸m³.According to the development program made in May,2001,the production of Shapingchang carbonic gas reservoir will be 13×10⁸m³/a.It is very important for the gas transmission eastward engineering and the gas field development whether or not the program can be fulfilled smoothly.So,the active edge water appeared in a part of the gas reservoir should not be ignored.During the production test,the formation water appeared at the 17th day after Well Tiandong 90 was put into production.And its flow rate increased to 98.76m³/d rapidly. It is a rare case for East Sichuan carbonic gas reservoirs to produce water so suddenly and so much.Based on the produced water characteristics,integrating the dynamic and static states study of the gas reservoir,and comparing the study results of the other water-bearing gas reservoirs in East Sichuan,the article believes the early produced water from Well Tiandong 90 belongs to water channeling of edge water along faults.There are large-medium size faults in the pay-zone near Well Tiandong 90.Water invasion comes from Sha 3 fault at east wing.But the energy of the edge water is limited.