低渗透储层测井分类和产能预测技术

依据储层特点和生产的需求,在流体性质识别的基础上,采用大量的测井和投产初期测试资料,利用统计学原理,提出储层参数厚度加权平均值概念,建立含油层测井储层参数与井投产产量之间关系,研究综合评价指数储层产能等级分类法,符合率达90.0%以上。在储层分类的基础上,分析储层产能的影响因素,利用平面径向稳态渗流原理,建立低孔隙度低渗透率储层压裂后产能预测模型及其参数计算方法,注重不同类别储层对井产能的贡献率,解决了低渗透储层压裂后投产产能测井预测难题,及其预测符合率达80.0%以上,形成低渗透储层产能预测技术。

Reservoir Classification and Productivity Forecasting Method for Low Prorosity and Permeability Reservoir with Log Data

Based on the identification of fluid properties,reservoir characteristics and production needs,we analyzed a mass of log data,test data in initial production and general theory of statistics,based on which proposed is the concept of reservoir thickness weighted average and established is relationship between reservoir parameters of oil-bearing formation and production rate.In this way,proposed is the classification of reservoir productivity-comprehensive evaluation index method,the forecasted productivity is 90% coincidence rate with the practical reservoir productivity.On the basis of reservoir classification,analyzed are the influencing factors on reservoir productivity.The theory of plane radial stable percolation is used to establish a model for post-frac low porosity & permeability reservoir productivity prediction and parameters algorithm,in which the contributions of different reservoirs to each well productivity are considered,and with which the productivity of the above post-frac reservoirs is successfully predicted,its forecasted productivity rate is up to 80%.The productivity prediction technology improves the log interpretation precision,and provides technical support for LWD data analyses,well-location distribution and adjustment,therefore,being less geologic risk for large well groups developments with lower cost and higher single well production.