松辽盆地北部西斜坡萨尔图油层二砂组沉积微相研究

大量岩心、录井、测井、地震、分析化验资料表明，松辽盆地北部西斜坡萨尔图油层二砂组主要分布于研究区东部，平面上主要由三角洲相和湖泊相组成，三角洲相主要发育河口坝微相、远砂坝微相和下切谷充填沉积；湖泊相主要发育滨浅湖砂坝和滨浅湖混合滩微相。河口坝砂体规模较大，物性较好，是油气聚集的有利储层，下切谷充填沉积呈长宽带状、面积较大，东连齐家—古龙坳陷，西接富拉尔基滨岸砂坝，砂岩中普遍含油显示，是富拉尔基油藏重要的油气运移通道。

Microfacies study of No.2 sand beds group of Saertu servoirs in west clinoform region of north Songliao Basin

this article studies subtly the characteristics of sedimentary mocrofacies of No.2 sand beds group of Saertu servoirs in the west clinoform region of north Songliao Basin. In the course of research, this article applies synthetically the up to date theories and methods of sedimentography, and geophysics, with using cores, logging, well logging, seismics, analysis assay data and paleontology data. No.2 sand beds group of Saertu servoirs distributes mainly middle part and east part. It composes mostly of delta facies and lacustrine facies in plane. Delta facies are mainly composed of delta estuarine bars , distal end bars microfacies and filling of erosion valley. Lacustrine facies aremainly composed of shore-shallow lacustrine sand bars and shore-shallow lacustrine mixing beaches mocrofacies. The scale of delta estuarine bars are relatively larger, and their physical properties are comparatively good. Delta estuarine bars are favorable servoirs of oil and gas migrating and gathering. The distribution of filling of erosion valley presents long-wide banding and its area is relatively larger. It connects eastern Qijia-gulong sag and western shore sand bars in Fulaerji region. Sandstones contain generally oil. Filling of erosion valley is important oil-gas migrating channel of Fulaerji servoirs. No.2 sand beds group of Saertu servoirs is overlain by regional caprocks of Nenjiang formation and strata of Nenjiang formation form caprock sealing.