孤岛油田中二中区馆陶组上段第三砂层组沉积微相研究

/ SEDIMENTARY FACIES OF THE THIRD SANDS GROUP IN UPPER MEMBER OF GUANTAO FORMATION IN MIDDLE PART OF MIDDLE 2 DISTRICT OF GUDAO OILFIELD

根据岩心观察结果，并综合利用测井资料数字处理成果、粒度分析、铸体薄片、电镜分析等资料，对孤岛油田中二中区馆陶组上段第三砂层组沉积微相进行了系统研究。该油田研究层段属曲流河沉积，又可将其细分为４种亚相（河道亚相、河道边缘亚相、泛滥平原亚相及废弃河道亚相）和７种微相（河道砂坝微相、河道充填微相、天然堤微相、决口扇微相、河漫滩地微相、河漫洼地微相和废弃河道微相）。根据砂层划分结果，对其中４个砂层的沉积微相平面展布特征全面地进行了分析，为储层非均质性研究、油田开发方案调整和动态分析提供了可靠的地质依据。

The types and distribution of the micro facies of the third sands group in upper member of Guantao formation at middle part of the middle 2 district in Gudao oilfield were studied by using log data and the digital processing achievements, size analyses, cast sections and SEM. This district belongs to meander river sediment, and it is further divided into 4 sub facieses of river channel, embankment, flood plain and abandoned channel sub facies, and into 7 micro facieses of sand bar, channel filling,natural barries, burseting fan, low ling land, flood land and abandoned channel micro facies. On the basis of sands dividing, the sedimentary facieses distribution of 4 sand beds at plane are analyzed. The results can provide a geological foundation for the research of heterogeneity and adjusting production of oilfield development.