大庆油田北部河流相储层沉积微相与水淹特征

大庆油田北部发育砂质辫状河道、曲流河道、高弯度分流河道和低弯度分流河道等砂体类型。以井间可对比的单一河流沉积物为研究单元 ,从河流相储层成因特征入手 ,应用油田开发后期密井网资料开展各类河流砂体细分微相研究。重点阐述了各类砂体的规模、宽厚比、发育的主要微相、物性特征及层内非均质特点。应用不同时期密闭取心检查井资料、测井水淹解释、生产动态测试资料 ,结合不同砂体和微相的非均质特点研究了不同微相的水淹变化特征。研究结果表明 ,不同阶段各类砂体层内及平面水淹变化特征不同 ,高含水后期剩余油主要分布于河间薄层砂、部分决口水道和废弃河道微相中 ,低弯度分流河道砂体中剩余油相对发育

MICROFACIES AND WATER FLOODED CHARACTERISTICS OF FLUVIAL RESERVOIR IN DAQING OILFIELD

In the northern part of Daqing Oilfield,fluvial channel sandbodies such as sandy braided channel,meander channel,high sinuosity channel and low sinuosity channel are developed.Based on the genetic characteristics of fluvial reservoir,guided by relative sedimentary knowledge,and with the help of density well pattern logging data,detailed microfacies study is conducted. This paper mainly focus on illustrating the heterogeneous characteristics of various kinds of sandbodies such as the dimension,ratio of width and thickness,developed microfacies and petrophysical properties.Using data from cored inspecting wells,water out logging interpretation and production performance,combined with different sandbody heterogeneity,the changing characteristics of water flooded are studied.The results show that at high water cut stages,remaining oil usually distributes in microfacies such as inter channel thin sand,abandoned channel and crevasse channel,which is relatively rich in low sinuosity channel sandbody.