稠油热采储层渗流屏障特征--以辽河西部凹陷某试验区于楼油层为例

渗流屏障为储层系统内遮挡流体渗流的岩体。以辽河西部凹陷某试验区于楼油层为例, 综合地质、400口井测井资料、6口取芯井岩芯资料、10口典型井水分析资料等多种资料, 详细研究了目的层渗流屏障的分类、发育规律以及对稠油热采储层开发的影响。从成因角度将研究区目的层扇三角洲前缘储层渗流屏障划分为沉积渗流屏障、成岩渗流屏障和封闭性断层渗流屏障等3种类型, 其中沉积渗流屏障占主导地位。受沉积作用控制, 沉积渗流屏障大体呈北东南西向条带状展布, 主要位于水下分流河道间泥和水下分流河道间砂的位置。从北西向南东方向, 随着与物源区距离逐渐增加, 沉积物粒度逐渐变小, 渗流屏障的发育程度也逐渐增强。渗流屏障的存在使得蒸汽驱热采过程中蒸汽的推进路径复杂化, 并进一步降低了蒸汽驱的热效率和经济有效性。渗流屏障的存在对分层注汽等开发措施的实施也具有十分重要的影响。

Flow Barrier Characteristics of Thermal Recovery of Heavy Oil Reservoir: Taking Yulou oil-bearing sets in some experimental area in the south end of westward slope of West depression in Liaohe Basin as an example

Flow barrier was rock mass which keep out fluid flow inside of reservoir system. Taking Yulou oil-bearing sets in some experimental area in the south end of westward slope of West depression in Liaohe Basin as an example, flow barrier were studied on the base of combining geological data and 400 well data and six well data of cores and water analysis data of ten wells. Types and distribution characteristics and its effects to thermal recovery of heavy oil reservoir were studied in detail. Flow barrier in reservoir of fan delta front of the aimed stratum in the study area were carved up into three types of sedimentary flow barrier and diagenesis flow barrier and sealing fault flow barrier by cause, and sedimentary flow barrier took the leading role. Controlled by sedimentary process, sedimentary flow barrier distributed from north-west to south-east like stripped noodles. They mainly lined in areas of underwater distributary channels and channel mouth bars. With distances changed more and more far, sediments granularity became smaller and sedimentary flow barrier developed levels were strengthened. Steam paths in steam flooding were complicated because of the existence of flow barrier. In this process, thermal and economical efficiency were reduced. Flow barriers also had very important influence to layer steam injection and other development measures carried out.