志丹油田旦八区长3油层组沉积微相研究

通过对志丹油田旦八区大量岩心的观察及90多口井的单井沉积相、剖面相、平面相的分析研究，认为该区长3油组为一套三角洲平原沉积，可见到分流河道、天然堤和河漫沼泽三个微相．对研究区沉积微相展布特征进行了研究．结果表明，有利储集体为分流河道砂体，受沉积微相展布控制。

Study on Sedimentary Microfacies of Chang 3 oil-Bearing Strata in Danba of Zhidan Oilfield

According to a lot of the core observations and the analyses of single well sedimentary facies, profile facies and plane facies of over 90 wells in the study area, it is held that Chang 3 oil--bearing strata is a delta plain. Three subfacies of delta plain distributary channel.natural levee and swamp are found. The sedimentary microfacies in this area are studied in detail,and it is shown that the oil reserving ability of distributary channel is the best, that is controlled by the sedimentary microfacies.