东道海子凹陷双重孔隙介质储层产量主控因素与产能预测

Main Controlling Factors and Productivity Prediction of Dual-porosity Medium Reservoirs in Dongdaohaizi Sag

为了明确东道海子凹陷双重孔隙介质储层产量的主控因素并制定产能预测方案,综合利用钻井取心、薄片鉴定、常规测井、成像测井和生产试油等资料,开展了储层基质参数和裂缝参数与米产液量的配置关系研究。在此基础上,采用相关性分析法和敏感参数分析法,构建了基质综合指数f_(1)和裂缝有效性指数f_(2),并建立了基于f_(1)和f_(2)指数的产能预测气泡图版。结果显示:研究区产量受基质和裂缝共同控制。渗透率、砾石含量、黏土含量和平均毛管半径为产量的基质主控因素,裂缝宽度和裂缝走向与最大水平主应力方向夹角为产量的裂缝主控因素,且裂缝对产能的控制作用强于基质;基于f_(1)、f_(2)指数的产能预测气泡图版与米产液量关系较好,将研究区储层产液能力较明显的区分为高产、中产和低产。经9井15层试油结果验证,预测图版的符合率达93.3%,这为研究区老井复查和新井产能预测提供了依据。

In order to clarify the main controlling factors of dual porous medium reservoir production in Dongdaohaizi Sag and formulate the productivity prediction scheme,the configuration relationship between reservoir matrix parameters,fracture parameters and meter liquid production was studied by comprehensively using the data of drilling coring,thin section identification,conventional logging,imaging logging and production test.On this basis,the matrix comprehensive index f_(1) and fracture effectiveness index f_(2) were constructed by using correlation analysis method and sensitive parameter analysis method,and the productivity prediction bubble chart based on f_(1) and f_(2) index was established.The results show that the yield in the study area is jointly controlled by matrix and fracture.Permeability,gravel content,clay content and average capillary radius are the matrix main controlling factors of production,fracture width and the angle between fracture strike and the direction of maximum horizontal principal stress are the main controlling factors of production,and the control effect of fracture on productivity is stronger than that of matrix.The productivity prediction bubble chart based on f_(1) and f_(2) indexes has a good relationship with the liquid production per meter.The liquid production capacity of the reservoir in the study area is obviously divided into high production,middle production and low production.Verified by the oil test results of 15 layers of well 9,the coincidence rate of the prediction chart is 93.3%,which provides a basis for the recheck of old wells and the productivity prediction of new wells in the study area.