鄂尔多斯盆地镇北油田长3油层组储层构型及剩余油精细表征  

Reservoir architecture and fine characterization of remaining oil of Chang 3 reservoir in Zhenbei oilfield,Ordos Basin

作　　者：张皓宇[1,2] 李茂[1] 康永梅[3] 吴泽民 王广 ZHANG Haoyu;LI Mao;KANG Yongmei;WU Zemin;WANG Guang(College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;Shaanxi Key Laboratory ofWell Stability and Fluid&Rock Mechanics in Oil and Gas Reservoirs,Xi’an Shiyou University,Xi’an 710065,China;No.11 Oil Production Plant,PetroChina Changqing Oilfield Company,Qingyang 745000,Gansu,China)

机构地区：[1]西安石油大学石油工程学院,西安710065 [2]陕西省油气井及储层渗流与岩石力学重点实验室·西安石油大学,西安710065 [3]中国石油长庆油田分公司第十一采油厂,甘肃庆阳745000

出　　处：《岩性油气藏》2021年第6期177-188,共12页Lithologic Reservoirs

基　　金：国家自然科学基金项目“陆相页岩井周天然裂隙力学活动性评价方法基础研究”(编号:51874239)资助。

摘　　要：镇北油田镇300井区长3油层组目前已进入特高含水期,层间非均质性强,吸水不均井占测试总井数的48%,为了提供建产方向,急需进一步刻画剩余油分布。利用经典的构型分析方法,结合具有沉积单元和渗流单元双重特性的复合砂体韵律特征和渗流规律,总结了研究区长3油层组4种垂向叠置样式、5种平面接触关系并明确测井识别标志。最后利用油藏数值模拟和生产动态结合的方法明确指出2种剩余油控制因素。研究结果表明:注采井网的不完善,是造成孤立式和分离式叠置关系单砂体剩余油的主要因素;切叠式单砂体剩余油主要集中在砂体顶部;间湾接触的单砂体易造成河道侧翼剩余油富集;得益于较好的连通性和较高的水驱效率,替代式和侧切式接触关系砂体不富集剩余油;对接式接触的单砂体连通关系复杂,单一的判别方式易造成注采不对应,进而形成局部剩余油。该研究成果能兼顾储层构型对油藏剩余油的控制作用和流动单元的渗流特性,可有效指导油藏注采井网部署,为油田后期注水开发方案的调整提供了新的思路。Chang 3 reservoir in well area Zhen 300 in Zhenbei oilfield has entered ultra-high water cut stage,with strong interlayer heterogeneity,and the wells with uneven water absorption accounted for 48%of the total number of tested wells.In order to provide direction for production,it is urgent to further characterize the remaining oil distribution.By using classic architecture analysis methods,combined with rhythm characteristics and seepage laws of composite sand bodies being with dual characteristics of sedimentary unit and seepage unit,four vertical superimposed styles and five plane contact relationships of Chang 3 reservoir in the study area were summarized,and logging identification marks were clearly defined.Two remaining oil controlling factors were clearly pointed out by using the combination of reservoir numerical simulation and production performance.The results show that the imperfect injection-production well pattern is the main factor causing the remaining oil in the isolated and separated superimposed single sand body.The remaining oil in the cutting and stacked single sand body is mainly concentrated at the top of the sand body.The single sand body contacted with the bay are likely to cause the enri chment of remaining oil in the flanks of the river channel.Due to the good connectivity and high water drive effi‐ciency,the alternative and side-cut contact sand bodies are not enriched with remaining oil.The connection rela‐tionship of butt-joint single sand body is complex,and a single discriminant method is easy to cause mismatch be‐tween injection and production,and then form local remaining oil.The research result takes into account the control effect of reservoir architecture on the remaining oil and the seepage characteristics of the flow units,so it can effe ctively guide the deployment of reservoir injection and production well pattern,and provide new ideas for the adjustment of the subsequent water injection development of the oilfield.

关 键 词：单砂体 储层构型 流动单元 油藏数值模拟 剩余油模型 

分 类 号：TE122[石油与天然气工程—油气勘探]