王官屯油田G 104断块沉积微相研究

Study on sedimentary microfacies of G 104 fault block in Wangguantun Oilfield

为进一步查明砂体分布规律,开展了王官屯油田G104断块沉积微相研究。该断块孔一段枣Ⅲ、枣Ⅱ油层组属于冲积扇扇中辫状河沉积,枣Ⅲ油层组处于冲积扇发育鼎盛期,而枣Ⅱ油层组处于冲积扇发育衰败开始期,发育心滩、辫状河道与河漫滩等沉积微相。河道流向以北北东向为主,微相分布具有复合连片河道型、宽河道型、窄河道型共3种分布形式,辫状河道规模由枣Ⅲ至枣Ⅱ油层组向上逐渐变小,心滩从有到无,规模从大到小。

In order to further find out the sand-body distribution rules,the sedimentary microfacies study was made to G 104 fault block of Wangguantun Oilfield.Pay zones of Zao Ⅲ and Ⅱ in Kongyi segment of the fault block belong to middle alluvial fan braided river deposit,Zao Ⅲ pay zone is in the peak of alluvial fan,while Zao Ⅱpay zone is at the beginning of the decline of the alluvial fan,the channel bar,braided channel,valley flat and the other sedimentary microfacies were developed.The river mainly flows to the NNE.Microfacies distribution has three kinds of distribution patterns:composite contiguous channel-type,wide channel-type and narrow channel-type.Braided channel scale gradually becomes smaller upwards from Zao Ⅲ pay zone to Zao Ⅱpay zone,the channel bar is gradually reduced,its scale changes from the big to the small.