致密砂岩气层压裂后产能测井定量预测  

Productivity Logging Quantitative Forecasting Method for Gas Yield in Post-frac Tight Sandstone Reservoir

作　　者：陈烈[1,2] 郭冀宁 刘财广 王媛媛[3] CHEN Lie;GUO Jining;LIU Caiguang;WANG Yuanyuan(Key Laboratory of Exploration Technologies for Oil and Gas Resources of Education Ministry, Yangtze University,Wuhan,Hubei 430100,China;Geophysics and Oil Resource Institute, Yangtze University,Wuhan,Hubei 430100,China;PetroChina XinJiang OilField Company Heavy oil Development Company,Kelamayi,Xinjiang 834000,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]长江大学地球物理与石油资源学院,湖北武汉430100 [3]中国石油新疆油田分公司重油开发公司,新疆克拉玛依834000

出　　处：《中国锰业》2019年第2期71-76,共6页China Manganese Industry

基　　金：湖北省自然科学基金(2013CFB396)

摘　　要：针对鄂尔多斯盆地X地区石盒子组致密砂岩气层压裂后产能测井预测问题,首先研究储层品质对压裂后产能的影响,在渗流力学理论与毛管理论的基础上,可以确定储层压裂后每米产气量与有效流动孔隙度存在指数关系,并且确定计算有效流动孔隙度的T_2截止值为33 ms;然后依据阵列声波测井资料求得储层测井脆性指数(动态脆性指数),结合测试资料确定了岩石可压裂性的测井脆性指数下限为55%;最后,建立储层压裂后每米产气量测井定量预测模型。将压裂后产能测井定量预测模型应用于鄂尔多斯盆地X地区石盒子组致密砂岩气层的产能预测,预测结果与测试结果符合很好,相对误差均在10%以内,为相同地质区块的致密气藏压裂后产能测井定量预测提供一种思路。Aiming at the prediction of the post-frac productivity logging of tight sandstone gas reservoirs in Shixianzi Formation in X area of Ordos Basin,the paper has made a study of the effect of reservoir quality on the post-frac productivity. Based on seepage mechanics theory and capillary theory,we can find that there is an exponential relationship between fractured meters of gas production and effective flow porosity. The cut-off value of T2 for the calculation of effective flow porosity is determined to be 33 ms. According to the array acoustic logging data,the reservoir logging brittleness index (dynamic brittleness index) is obtained. Also,the lower limit of the logging brittleness index of the rock fracturing is determined to be 55%. Finally,the logging quantitative prediction model of fractured gas production per meter is established. The model is applied to forecasting the post-frac productivity in Shihezi formation in X area of Ordos basin,including the forecast result. The relative error is less than 10%,as provides an idea for the quantitative prediction of productivity logging after fracturing of tight gas reservoirs in the same geological block.

关 键 词：致密砂岩 压裂后产能 测井定量预测 有效流动孔隙度 脆性指数 

分 类 号：P631.8[天文地球—地质矿产勘探]