水驱油藏优势渗流通道识别及其效果分析  

Identification of Dominant Seepage Channels in Water-flooded Reservoirs and Analysis of Their Effects

作　　者：张庆宇 鞠斌山[1,2] ZHANG Qingyu;JU Binshan(School of Energy resource,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]非常规天然气能源地质评价与开发工程重点实验室,北京100083

出　　处：《现代地质》2024年第6期1523-1531,共9页Geoscience

基　　金：国家科技重大专项(2017ZX05009-005)。

摘　　要：油藏中优势渗流通道的存在及其分布,显著影响着油藏开发对策与开发效果。本文综合运用多相渗流和储层地质理论,建立表征注采井间小层连通性及识别优势渗流通道存在的方法。基于小层对比法、地质建模法和示踪剂法,详细解剖某油田一个代表性井组的砂体连通性和优势渗流通道的发育特征。研究结果表明:在研究区实例井组的注采井间,三种方法得到的储层连通率差异较大,其中精度较高的示踪剂法确定的连通率为40%;并在重点解剖小层中识别出三条优势渗流通道,依据示踪剂见剂速度与回采率,对三条优势渗流通道的发育程度进行了分级。对比实际监测结果,小层对比分析法得到的连通率明显偏高,地质建模法与示踪剂法得到的连通率比较接近,两种方法得到的连通率均受到开发小层的储层沉积与相变规律、非均质性及实测资料精细度的影响。示踪剂法识别优势渗流通道效果最佳,比地质建模法的识别精度提高了25%。The existence and distribution of dominant seepage channels in reservoirs significantly affect reservoir development countermeasures and development effects.This paper uses multiphase seepage and reservoir geology theory to establish a method to characterize the connectivity of sub-layers between injection and production wells and identify the existence of dominant seepage channels.Based on the sub-layer comparison method,geological modeling method and tracer method,the sand body connectivity and the development characteristics of dominant seepage channels of a representative well group in an oil field are dissected in detail.The research results show that among the injection-production wells in the example well group in the study area,the reservoir connectivity rates obtained by the three methods are quite different.Among them,the connectivity rate determined by the tracer method with higher accuracy is 40%,and three dominant seepage channels are identified in the key anatomical layers.The development degrees of the three dominant seepage channels are graded according to the tracer seepage rate and recovery rate.Compared with the actual monitoring results,the connectivity rate obtained by the comparative analysis of the sub-layer is obviously high,and the connectivity rate obtained by the geological modeling method and the tracer method is relatively close,and the connectivity rate obtained by the two methods is affected by the reservoir sedimentation and facies transformation law,heterogeneity and the fineness of the measured data of the developed sub-layer.The tracer method has the best effect in identifying the dominant seepage channel,and the identification accuracy is 25%higher than that of the geological modeling method.

关 键 词：优势渗流通道 井间连通性 示踪剂 小层对比 油藏建模 

分 类 号：P618.1[天文地球—矿床学]