变质岩潜山油藏开发特征研究  

Study on Development Features of the Metamorphic Rock Buried Hill Reservoir

作　　者：邢淑霞[1] 

机构地区：[1]中国石油辽河油田公司勘探开发研究院,辽宁盘锦124010

出　　处：《中外能源》2016年第4期45-49,共5页Sino-Global Energy

基　　金：中国石油天然气股份有限公司重大科技专项"辽河油田原油千万吨持续稳产关键技术研究"(项目编号:2012E-3005)资助

摘　　要：辽河油田兴古7块属于裂缝型块状底水变质岩潜山油藏。油藏多发育中高角度裂缝,具有地层古老、潜山内幕构造复杂、岩性多样、含油幅度大、油层巨厚等地质特征,开发特点为平面上满块含油,纵向分段见油;非均质性强,产能差异大;油藏天然能量不充足,注水难受效;水平井开发效果好;纵叠平错三维井网设计合理,有效发挥重力驱油作用,适用于注气立体开发。运用数值模拟方法,分析该块油藏外在开发指标特征与内在渗流机理的联系,预测各项技术指标后,发现各阶段产量递减率、地层压力、气油比、含水等技术指标变化存在明显节点。依据指标变化节点,将立体开发划分为弹性驱阶段、重力驱阶段、气驱见效阶段、注气突破阶段、注气突破后期五个开发阶段,解决了变质岩潜山油藏立体开发阶段划分的瓶颈问题。该研究对变质岩潜山油藏的立体开发具有理论指导意义。Xinggu7 block of Liaohe oilfield is a fractured massive buried hill reservoir of metamorphic rocks with bottom water.Middle-high angle fractures were developed mainly in the oil reservoir.The oil reservoir has the geological features such as ancient strata,complex structure inside buried hill,various lithology,large range of oil bearing and giant thick oil layers and so on.The oil reservoir has the development features as follows：being full of oil on plane,oil distributed in vertical intervals;strong heterogeneity,large difference of productivity;insufficient natural energy and no water injection effect;good effect of the development by the horizontal wells.The design of vertical stack and horizontal staggered three-dimensional well pattern is reasonable,which can effectively play the role of gravity drive and is suitable for tridimensional development for gas injection.Based on the numerical simulation method,the relationship between external development indexes and internal flow mechanism of the oil reservoir was analyzed.After each technical index was predicted,there was a significant change in the rate of production decline,formation pressure,gas oil ratio,water cut and so on in each stage.According to the index change node,the tridimensional development was divided into five stages： elastic drive stage,gravity drive stage,effective gas drive stage,gas injection breakthrough stage and late stage of gas injection breakthrough.It solved the bottleneck problem of the division of tridimensional development stage in the metamorphic rock buried hill reservoir.The research provides theoretical guidance for the tridimensional de-velopment in the metamorphic rock buried hill reservoir.

关 键 词：潜山油藏 立体开发 数值模拟 阶段划分 开发指标界定 注气 

分 类 号：TE34[石油与天然气工程—油气田开发工程]