大情字井地区青一段沉积微相分布特征

Distribution of Sedimentary Microfacies of First Section of Qingshankou Formation in Daqingzijing Area

根据松辽盆地南部大情字井地区的单井相、剖面相分析,在青山口组一段沉积时期,湖水继续扩张,自下而上湖水到青一段沉积末期扩张到最大。在本区青一段主要发育分流河道、分流间湾、水下分支河道、河道间、河口坝和席状砂等沉积微相类型。其中河口坝砂岩在青山口组内广泛发育,是最重要的储层微相类型。

Based on the analysis of single well facies and section facies,the lake went on expanding during Qingshankou Formation deposition and expanded to the max from bottom to top in the end of the first section of deposition period.In this area,the first section of Qingshankou formation mainly developed sedimentary microfacies of distributary channel,interdistributory bay,underwater branch channel,interchannel,mouth bar and sand sheet,in which the mouth bar sand developed most widely in the first section of Qingshankou formation.It is the most important type of reservoir microfacies.