长春岭油田C107区块扶余油层密井网曲流河储层构型分析

以长春岭油田C107区块扶余油层为例,综合应用岩心、录井、动态及测试等资料,按层次分析的思路对曲流河储层进行了构型分析。在井上单河道砂体识别的基础上,采用相控对比方法进行了单河道砂体的井间对比。基于现代沉积,提出了"S"型、同向式、背向式和切割式4类点坝砂体的组合模式,结合点坝砂体厚度特征以及与其紧邻废弃河道分布特征,在研究区识别出8个点坝砂体,单个点坝砂体面积在0.02～0.16km2。综合录井、岩心和测井等资料,在单井侧积层识别的基础上,结合对子井分析法,计算出侧积层的倾角为5°左右,侧积体的宽度为25～70m,建立了点坝砂体内部构型定量模式。应用曲流河构型分析成果,指导了热采动态分析。

Architectural analysis of meandering river reservoirs in Fuyu oil layer,C107 block,Changchunling oil field

This is a case study of Fuyu oil layer in C107 block,Changchunling oil field,which analyzed the architecture of meandering river reservoirs by hierarchy method with the data of lithology,logging,dynamics and testing etc.Based on the identification of single channel sandbodies and modern meandering river pattern,inter-well correlations of these sandbodies were conducted by facies-dominated principle and four association models of point bars have been developed such as sigmoid,orthokinetic,antitropic,and dissected.In the study area,eight point bars with areas ranging from 0.02 km2 to 0.16 km2 were identified according to the thickness of point bars and characteristics of adjacent abandoned channels.Integrating the data of logging,core and wireline well log,identification of lateral accretions,and analysis of analogous wells,dip angle of lateral accretions was calculated to be about 5° and the width of lateral accretions was expected to range from 25 m to 70 m.Therefore,quantitative model for architecture of point bars was established by these parameters.The results of meandering river’s architectural analysis provide an insight into thermal production dynamics.