杏北开发区薄差储层相渗特征研究

针对薄差储层注水开发认识不足的问题,通过收集相关现场相渗以及储层物性数据,筛选出具有薄差储层特征的相渗曲线40条,并利用统计学原理方法,对这些相渗数据进行处理及分析。结果表明,薄差储层相渗曲线的形态主要为水相凸型、水相凹型、水相直线型3种类型,根据薄差储层的渗透率分布范围,将其相渗曲线分成了10 mD以下、10~100 mD、100~200 mD和200 mD以上4个渗透率级别的相渗曲线,对其不同渗透率级别的典型相渗曲线进行分析,得出了薄差储层相渗特征总体呈现“双高双低”。通过分析不同开发阶段不同渗透率级别的薄差储层相渗曲线及其各特征参数,得出在长期注水条件下,不同渗透率级别的相渗曲线会产生不同的变化和影响,一边为相渗扩大型及有利影响,另一边为相渗缩小型及不利影响。

Phase Infiltration Characteristics of Thin and Poor Reservoir in Xingbei Development Zone

Aiming at the problem of insufficient understanding of thin and poor reservoir waterflooding development, 40 phase permeability curves with thin and poor reservoir characteristics are screened out by collecting relevant in⁃situ permeability and reservoir physical properties data, and these permeability data are processed and analyzed by using statistical principle and method. The results show that the permeability curves of thin⁃difference reservoirs are mainly of three types: convex, concave and straight⁃line. According to the permeability distribution range of thin and poor reservoirs, the permeability curves can be divided into four permeability levels: below 10 mD, 10~100 mD, 100~200 mD and above 200 mD. The typical permeability curves of the same permeability level are analyzed, and it is concluded that the permeability characteristics of thin and poor reservoirs generally present the characteristics of "double high and double bottom". By analyzing the permeability curves and their characteristic parameters of thin and poor reservoirs with different permeability grades in different development stages, it is concluded that the permeability curves of different permeability grades will have different changes and effects under long⁃term water injection conditions, on the one hand, the enlarged and beneficial effects of phase permeability, on the other hand, the reduced and adverse effects of phase permeability.