松辽盆地泰康地区青山口组沉积相及与油气分布关系研究

Sedimentary Facies and Oil-Gas Distribution Regularities of the Qingshankou Formation, Taikang Area, Songliao Basin

系统研究了松辽盆地泰康地区青山口组沉积相类型及沉积特征。对其中青一段与青二、三段的沉积相平面分布与垂向演化规律做了较深入的探讨。青山口组主要发育湖泊相与三角洲相2种沉积相类型,湖泊相包括2种亚相与4种微相,三角洲相包括2种亚相和2种微相。青一段以深湖、半深湖相泥岩沉积为特征,青二、三段以浅湖相与三角洲相砂泥岩互层为特征。区内青山口组主要存在3种类型的储层砂体,分别为三角洲前缘河口坝砂体、三角洲前缘远砂坝砂体和浅湖砂体,其中浅湖砂体是最好的含油砂体,浅湖砂体发育的优势区也即浅湖沉积亚相发育区是区内最重要的油气富集区,是今后油气勘探的有利地区。

The types of sedimentary facies and the sedimentary characteristics of the Qingshankou Formation in Taikang area of Songliao Basin are systematically analyzed, and the planar distribution of sedimentary facies and vertical evolution regularities in the 1 s, Member and 2^nd-3^rd Members of the Qingshankou Formation are studied in detail. The results show that Qingshankou Formation is mainly composed of lacustrine and delta facies. The lacustrine facies ineludes 2 types of sedimentary subfacies and 4 types of sedimentary microfacies. Delta facies includes 2 types of sedimentary subfacies and 2 types of sedimentary microfacies. The analysis of sedimentary evolution shows that the characteristics of the 1^st Member of the Qingshankou Formation are sediments of deep and semi-deep lacustrine mudstone, but the characteristics of the 2^nd-3^rd Member of the Qingshankou Formation are sediments of shallow lacustrine and lacustrine delta mudstone and sandstone. There are mainly 3 types of sandstone-bodies reservoirs in Qingshankou Formation. They are mouth bar sandstone-body, distal bar sandstone-body and lacustrine sandstonebody in turn. The lacustrine sandstone-body is the best sandstone-body for oil. The lacustrine subfacies area, where the lacustrine sandstone-body develops, is the most potential area for exploring oil in the future.