鄂尔多斯盆地西南缘断缝体油藏开发特征与潜力  

Development characteristics and potential of fault-fracture reservoir in southwest margin of Ordos Basin

作　　者：何发岐[1,3] 李俊鹿 高一龙 吴锦伟[2] 白兴盈 高盾 HE Faqi;LI Junlu;GAO Yilong;WU Jinwei;BAI Xingying;GAO Dun(Sinopec North China Oil and Gas Company,Zhengzhou,Henan 450006,China;No.1 Oil Production Plant,Sinopec North China Oil and Gas Company,Xi’an,Shaanxi 710069,China;Sinopec Key Laboratory of Deep Coalbed Methane Exploration and Development,Beijing 100000,China)

机构地区：[1]中国石化华北油气分公司,河南郑州450006 [2]中国石化华北油气分公司采油一厂,陕西西安710069 [3]中国石化深层煤层气勘探开发重点实验室,北京100000

出　　处：《油气藏评价与开发》2024年第5期667-677,F0002,共12页Petroleum Reservoir Evaluation and Development

基　　金：中国石化重点课题“鄂南致密油效益开发关键技术研究与应用”(P23005)。

摘　　要：鄂尔多斯盆地西南缘广泛发育不同规模断层和裂缝,极大地改善了致密储层渗流能力,形成了基质储层低渗透背景下的优质油藏类型——断缝体油藏,同时也加剧了油藏的非均质性和产能的差异性,给油藏内幕结构精细刻画和产能控制因素研究带来挑战。充分运用断裂体系空间刻画、断裂分类分级和产能对比分析等方法,基于井-震-藏联合攻关进一步明确了断缝体油藏开发特征。建立了断缝体油藏“二元四区”模型,划分出断核破碎带、诱导裂缝带、微裂缝改造带、基质孔隙带等4个区带,其中断核破碎带是主要产量贡献单元。断层延伸长度越长、实钻构造位置越高,断核破碎带单井产能越高。诱导裂缝带距离断层越近,产能也越高。断缝体油井生产特征主要分为3个阶段:①断裂系统作为储集体的高产阶段;②断裂系统既作为储集体又同时发挥导流作用的储-导转化阶段;③裂缝主要发挥导流作用阶段。通过研究大幅提升了断缝体油藏高产井占比,同时对盆地西南缘中生界油藏高效滚动勘探开发部署具有重要的指导作用。The southwest margin of Ordos Basin has developed faults and fractures to varying scales,significantly enhancing the permeability of tight reservoirs and forming high-quality fault-fracture reservoirs against a backdrop of low permeability reservoir types.However,this also complicates the reservoir's homogeneity and the variability of its capacity,posing challenges for fine characterization of the reservoir's internal structure and for researching capacity control factors.To address these issues,the study employs spatial characterization of the fracture system,fracture classification,and capacity comparative analysis.Further,the development characteristics of the fault-fracture reservoir are defined through joint well-seismic and reservoir research.Key findings from this research include:1)Establishment of the“binary four zones”model for fault-fracture reservoirs,which divides the reservoir into four distinct zones:the core fracture zone,the induced fracture zone,the micro-fracture transformation zone,and the matrix pore zone.Among these,the core fracture zone is identified as the primary contributor to production yield.2)It is observed that the longer the fault extension length and the higher the solid drilling structure position,the higher the single well production capacity in the core fracture zone.The induced fracture zone's proximity to the fault correlates with higher production capacity,demonstrating the spatial impact of fault structures on reservoir productivity.3)The production characteristics of fracture wells are categorized into three stages:①the fracture system acts as the high yield stage;②the fracture system serves as the storage stage and plays the role of diversion;③the fracture's primarily function in diversion.This research significantly increases the proportion of high-yield wells in the fault-fracture reservoir,providing crucial insights for guiding efficient,ongoing exploration and development activities in the Mesozoic reservoirs on the southwest margin of the basin.This strateg

关 键 词：鄂尔多斯盆地西南缘 断缝体油藏 “二元四区”模型 开发特征 高产富集规律 

分 类 号：TE357[石油与天然气工程—油气田开发工程]