缝洞型油藏剩余油类型及其动用方式研究

Study on Remaining Oil Types and Production Modes of Fracture-vuggy Reservoirs

塔河油田缝洞型油藏已进入中高含水开发阶段,受构造断裂和多期岩溶缝洞控制,储层非均质性强、井洞关系差异大,导致对剩余油的分布模式认识不清。针对上述问题,基于地震静态资料、钻完井资料和生产动态资料,开展了储层定量化研究,结果显示剩余油分布受重力分异作用、渗流阻力屏蔽和井间压差差异影响,基于岩溶地质特征、缝洞关系综合分析,提出了利于矿场挖潜的剩余油分布模式,制定了以注气、堵水、酸压为主的挖潜思路。

The fracture-vape reservoir in Tahe Oilfield has entered the development stage of middle and high water cut.It is controlled by structural faults and multi-stage karst fracture-vape.The reservoir heterogeneity is strong and the relationship between well and vape is different,which leads to the unclear understanding of the distribution pattern of remaining oil.To solve the above problems,a quantitative reservoir research was carried out based on seismic static data,drilling and completion data and production dynamic data.The results showed that the distribution of remaining oil was affected by gravity differentiation,seepage resistance shielding and the difference of pressure difference between wells.Based on comprehensive analysis of karst geological characteristics and fracture hole relationships,a distribution model of remaining oil that is conducive to mining potential has been proposed,and targeted ideas for tapping potential have been developed,focusing on gas injection,water plugging,and acid fracturing.This research has great significance for improving oil recovery in Tahe Oilfield.