宝力格油田巴19断块开发中后期沉积微相研究  

Study on sedimentary microfacies at the medium——later development stages at Ba19 block in Baolige oilfield

作　　者：梁官忠 李海燕[2] 

机构地区：[1]中国石油华北油田公司二连石油勘探开发公司,内蒙古锡林浩特026017 [2]中国石油大学北京资源与信息学院

出　　处：《石油地质与工程》2008年第5期51-54,57,共5页Petroleum Geology and Engineering

基　　金：国家973项目重大基础研究前期研究专项(2002CCA00700)

摘　　要：重新认识处于开发中后期油藏的沉积环境、沉积微相及其特征,建立准确的储集层模型,对于查明剩余油分布和挖掘剩余油潜力、提高采收率具有重要的现实意义。综合运用岩心观察、岩相分析、测井相分析等手段,对宝力格油田巴19断块阿四段Ⅱ油组沉积微相进行了系统研究。结果表明:该区阿四段为一套辫状河直接入湖形成的扇三角洲沉积,主要发育水下分流河道、河口坝、远砂坝、前缘席状砂、水下分流河道间及前扇三角洲泥6个微相,水下分流河道和河口坝砂体为储集层骨架砂体。对研究区主力小层沉积微相的时空展布特征进行了分析,讨论了沉积微相与含油性的关系,认为油气聚集受沉积微相的控制。水下分流河道的储集性能最好。河口坝次之。远砂坝和前缘席状砂较差,为油田开发方案的调整和动态分析提供了可靠的地质依据。For a reservoir at the medium-later development stage,a fine study on microfacies is crucial for establishing a proper reservoir model,ascertaining the distribution of re- maining oil and improving oil recovery rate.Through core observation,lithofacies analysis and log facies analysis,the sedimentary microfacies ofⅡoil-bearing strata,the 4th member of Aershan Formation,Ba19 block,Baolige oilfield, were studied systematically.Results suggests that the 4th member of Aershan Formation at the interest area is com- posed of fan delta deposit resulting from the braided river flowed directly into the lake,and it is further divided into 6 microfacies as subaqueous distributary channel,mouth bar, distal bar,front sheet sand,subaqueous distributary channel bay and front fan delta mud.The subaqueous distributary channel deposit and mouth bar deposit are the main reser- voirs.The evolution and the distribution of microfacies in main oil-bearing horizons have been studied.The investiga- tion on relationship between microfacies and oil-bearing in- dicates that the oil and gas accumulation is subject to micro- facies.As of the storage and preservation ability,the suba- queous distributary channel is the best,the mouth bar sec- ond,and the distal bar and front sheet sand body the worst. The results provide a geological foundation for the adjust- ment of reservoir development scheme and the dynamic anal- ysis.

关 键 词：沉积微相 扇三角洲 储集层 测井相 巴19断块 

分 类 号：TE111.3[石油与天然气工程—油气勘探]