北部湾盆地涠西南凹陷A油田储层沉积微相精细研究  

Fine study on the sedimentary microfacies of the reservoirs in Oilfield A of the Weixi’nan Sag,Beibuwan Basin

作　　者：朱金起 郇金来 陈奎 郭增强 李亚男 ZHU Jinqi;HUAN Jinlai;CHEN Kui;GUO Zengqiang;LI Yanan(Zhanjiang Branch Company,CNOOC(China)Co.,Ltd.,Zhanjiang 524057,Guangdong,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《石油地质与工程》2025年第2期52-58,共7页Petroleum Geology and Engineering

基　　金：中海油十四五重大科技项目“海上双高-双特高水驱油田提高采收率油藏关键技术”(KJGG2021-05013)。

摘　　要：北部湾盆地涠西南凹陷古近系陆相断陷湖盆沉积微相平面变化快、纵向非均质性强,油田开发井低产低效,剩余油挖潜难度大。以A油田渐新统涠洲组三段为研究对象,通过总结区域岩石相、测井相、地震相综合特征,识别出水下分流河道、河口坝、席状砂、水下分流间湾、滨浅湖泥等多种沉积微相;总结不同沉积微相的特征,建立了辫状河三角洲前缘及滨浅湖沉积微相识别图版;结合连井相、平面相等研究,精细刻画了沉积微相垂向及平面展布,为油田后期精细调整奠定了基础。The sedimentary microfacies of the Paleogene continental faulted lacustrine basin in the Weixinan Sag of the Beibuwan Basin change rapidly in the plane and exhibit strong vertical heterogeneity,resulting in low productivity and efficiency of oilfield development wells,and great difficulty in tapping the remaining oil potential.Selecting the third member of the Weizhou Formation in the Oligocene of Oilfield A as the research object,by summarizing the comprehensive characteristics of regional rock facies,logging facies,and seismic facies,multiple sedimentary microfacies such as underwater distributary channels,river mouth dams,sheet sands,underwater distributary bays,and shore shallow lacustine mud were identified.Through summarizing the characteristics of different sedimentary microfacies,identification charts for the sedimentary microfacies of the braided river delta front and shore-shallow lacustine were established.Combined with the studies of well-to-well correlation facies and planar facies,the vertical and planar distribution of sedimentary microfacies is finely characterized,laying a basis for the fine adjustment in the later stage.

关 键 词：涠西南凹陷 北部湾盆地 地震相 测井相 沉积微相 

分 类 号：TE111.3[石油与天然气工程—油气勘探]