单一辫流带内部构型单元解析  

Analysis of internal architecture unit of single braided flow zone

作　　者：邹拓[1] 王永凯 田昀[1] 陈璞[1] 杨宇华 冯国杰[1] Zou Tuo;Wang Yongkai;Tian Yun;Chen Pu;Yang Yuhua;Feng Guojie

机构地区：[1]中国石油大港油田分公司勘探开发研究院 [2]中国石油大港油田分公司资源评价处 [3]中国石油大港油田分公司对外合作项目部

出　　处：《录井工程》2019年第2期116-121,138,共7页Mud Logging Engineering

基　　金：中国石油天然气股份有限公司重大科技专项“大港油区大油气田勘探开发关键技术研究”(编号:2014E-0601)

摘　　要：为了加深对港西油田四区厚层辫状河储集层内剩余油的认识,更准确地评价储集层内剩余油开发效果,运用储集层构型理论和层次界面分析法,按级次分析了港西油田四区厚层辫状河储集层内辫流带、辫状河道构型要素。研究结果表明,该区发育单一辫流带,主水道沿北东物源方向分叉形成2条河道主流线,平均砂厚10.9 m,长宽比约2.3∶1;辫状河道包括心滩坝和辫状水道2种(主要4级构型单元),提出了夹层配位差异、注采效应差异、砂体高程差异、沉积厚度差异4种单一心滩坝识别方法,总结了3种辫状水道充填模式(分别为砂质、半泥质和泥质充填),该区以半泥质水道充填沉积为主。通过单一心滩坝和辫状水道识别,对4级构型要素进行平面组合分析可知,该区辫状河储集层平面呈现“宽坝窄河道”特征,心滩坝内部发育丰富落淤层,局部发育坝上沟道,且因半泥质和泥质充填河道,对流体渗流形成一定范围的隔挡。该研究结果为区内注采井网部署及射孔方案设计提供了参考,也为该区剩余油挖潜提供了有力支撑。To deepen the understanding of the remaining oil in the thick braided river reservoirs of Gangxi oilfield Ⅳ zone and evaluate the development effect of the remaining oil in the reservoir accurately,braided flow zone and braided channel architecture elements in the thick braided river reservoir of Gangxi oilfield Ⅳ zone were analyzed by grade on the basis of reservoir architecture theory and hierarchical interface analysis method. The results show that a single braided flow zone is developed in this area,and the main channel is bifurcated along the northeast source to form two main stream lines with an average sand thickness of 10.9 m and length-width ratio about 2.3∶1. The braided channel includes two types of channel bar and braided waterways(mainly four-stage architecture units). Four single channel bar identification methods are proposed,which are interlayer coordination difference,injection-production effect difference,sand body elevation difference and sedimentary thickness difference. Three types of braided waterway filling modes are summarized(sandy,semi-muddy and muddy filling). The study area is dominated by semi-muddy channel filling and deposition. Through the identification of single channel bar and braided waterway,the plane combination analysis of the four-stage architecture elements shows that the braided river reservoir plane in the study area presents the characteristics of wide dam and narrow river channel. The inner part of channel bar is rich in falling silt seams,and the channels on the dam are locally developed. Due to the semi-muddy and muddy filling of the river channel,a certain range of barriers are formed for fluid seepage. The research results provide reference for the deployment of injection-production well pattern and perforation scheme in the area,and also provide favorable support for tapping the potential of remaining oil in the area.

关 键 词：储集层构型 辫状河沉积 心滩坝 辫状水道 港西油田四区 

分 类 号：TE132.1[石油与天然气工程—油气勘探]