摘要
内蒙古二连盆地东北部马尼特坳陷东部阿尔善构造带南部的阿南凹陷阿3断块自投入开发以来先后经历了断块的无水采油期、断块的低含水开发期、断块的中低含水期,目前为断块的高含水开发期,进入开发瓶颈期,开发矛盾突出。以阿3断块下白垩统的阿尔善组阿四段和腾格尔组腾一段为研究对象,开展沉积构造、粒度特征、和测井曲线电性特征等识别研究。结果表明:(1)阿尔善期发育近岸水下扇内扇、扇中亚相,至腾格尔组沉积末期发育滨浅湖亚相;(2)平面上受北部阿南大断层的影响,砂体多为北东—南西向展布,垂向上沉积过程中发育水进沉积体系域,水体自下而上逐渐变深,水域扩大;(3)由于相变导致的物性变化制约剩余油挖潜,在沉积相指导下,结合实际生产情况,寻找剩余油相对富集区域。研究区域构造背景、物源方向、时空演化基础上总结阿3断块近岸水下扇沉积模式,寻找优质储层为油田开发提供地质依据。
The A3 fault block in the southern part of the Alshan structural belt in the eastern part of the Manite depression in the northeastern part of the Erlian Basin,Inner Mongolia,has gone through a period of anhydrous oil recovery,low water content development,and medium low water content development since its development.Currently,it is a period of high water content development for the fault block,entering a bottleneck period of development,and the development contradiction is prominent.The study focuses on the identification of sedimentary structures,grain size characteristics,and electrical characteristics of logging curves in the fourth section of the Alshan formation and the first section of the Tengger formation in the Lower Cretaceous of the A3 Fault Block.The results indicate that:(1)During the Alxanian period,nearshore underwater fan inner fan and fan subfacies developed,and by the end of the Tengger formation sedimentation,shoreline shallow lake subfacies developed;(2)Affected by the northern Anan Fault on the plane,the sand bodies are mostly distributed in a northeast southwest direction.During the vertical sedimentation process,water enters the sedimentary system tract,and the water gradually deepens from bottom to top,expanding the water body;(3)Due to the physical property changes caused by phase change,the remaining oil potential is restricted.Under the guidance of sedimentary facies and combined with actual production conditions,the relatively enriched areas of remaining oil are searched.Based on the research of regional tectonic background,source direction,and spatiotemporal evolution,summarize the sedimentary model of the nearshore underwater fan in the A3 fault block,and search for high-quality reservoirs to provide geological basis for oilfield development.
作者
贾方
曾庆桥
王睿思
周贤
王秀伟
严梦颖
崔洁
贾博涵
JIA Fang;ZENG Qingqiao;WANG Ruisi;ZHOU Xian;WANG Xiuwei;YAN Mengying;CUI Jie;JIA Bohan(Exploration and Development Research institute of CNPC Huabei Oilfield Branch,Renqiu,Hebei 062552,China;China Petroleum Engineering&Construction Corporation Huabei Branch,Renqiu,Hebei 062552,China)
出处
《世界石油工业》
2024年第1期49-60,共12页
World Petroleum Industry
基金
中国石油科技基金项目“原油提高采收率重大开发试验”(2023YQX10407ZK)。
关键词
二连盆地
阿3断块
白垩统
近岸水下扇
滨浅湖
沉积相
Erlian Basin
A3 fault block
Cretaceous series
nearshore underwater fan
shore shallow lake
sedimentary facies
