子北油田长6油组砂体分布及相带展布

根据５０多口井的单井相分析及数百幅粒度参数图件的编制分析，认为子北油田长６油组砂体主要属三角洲平原分流河道沉积．在此基础上，编制了长１６、长２６、长３６等主要产油层的砂体分布和相带展布图，初步确定了各砂层沉积时的古河道位置及南部玉家湾与北部南沟岔２个区块的相类型与相带展布特点，认为长３６～长１６沉积时，北部的南沟岔地区以发育富砂的低弯度河和曲流河型分支河道沉积为主，而玉家湾地区则发育较多的水下三角洲平原微相类型，砂体发育程度和储层物性前者总体优于后者．

Distribution of Sand Bodies and Lithofacies Belts of Chang 6 Oil bearing Formation in Zibei Oilfield,Eerduosi Basin

Based on the synthetic analysis of sedimentary facies of 50 wells and hundreds of grain size distribution figures,it can be concluded that the sand bodies of chang 6 oil bearing formation are mainly distributary channel deposits of delta plain facies.And by making distribution maps of the sand bodies and lithofacies,it is found that there exist two types of channel deposits in Nangoucha area (north part of the oilfield):the sand rich low sinuosity channels and mixed load meandering streams.It is held that this area belongs to the upper or subaerial delta plain.But in Yujiawan area(south part of the oilfield)lower or subaqueous delta plain deposits are more developed,which are characterized by the existence of mud rich low sinuosity channel sand bodies and other microfacies.As a result,the reservoir rocks are better in the north area than in the south.