摘要
川西低渗致密气藏具有多层系叠置的特点,大量气井是通过压裂改造后多层合采,测试也通常采用多层混合测试的方式。由于多层存在各小层静态特征差异及渗流特征的表现形式,在资料的解释时具有多解性。为提高测试资料的利用率,本文充分利用气藏地质认识、测录井数据及生产动态资料,分析了大量多层混合测试资料,并归纳提出了多层混合测试资料解释方法:①"产气层+差气层"或有一层产能贡献主要是措施改造层的两层混合测试时,可简化成单层资料处理;测试地层数大于或等于3时,如储层物性相近且属于同一气藏,可按渗透率高低将多层划分为2层,即简化为双渗模型处理;③当各测试层相隔100m以上且物性差异不大,有单层测试或生产测井资料等提供产能劈分依据时,可选用多层模型分层解释。
Tight gas reservoir with low permeability in western Sichuan is characterized by stacked multilayer system, commingled multilayer production after fracturing in a large number of gas wells, and muhilayer mixedtest commonly used.The data has ambiguity at interpretation for the differences on the static characteristics of sublayers and the manifestation of flow characteristics.In order to improve the utilization of test data,well test interpretation method has been summarized in this paper after a large number of multilayer test data was an- alyzed based on geological knowledge,logging data and dynamic data.If gas pay and poor gas-bearing forma- tion or two layers that one has main productivity contributed by improved layer test together,it can be treat- ed as single layer data.When tested formations are more than or equal to 3,muhiple layers can be divided into two layers according to the permeability in the same gas reservoir with similar physical properties.That is to say,it can be simplified into dual-permeability model.When the distance is more than 100m and few differences on physical properties exist among testing layers ,stratified interpretation may be done by muhilayer model based on production dividing by the data of single layer test and production logging data.
出处
《中外能源》
CAS
2010年第4期58-60,共3页
Sino-Global Energy
关键词
川西气田
低渗致密气藏
多层混合测试
试井分析
western Sichuan gas field
tight gas reservoir with low permeability
multilayer test
well test analysis
