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勘探证实,松辽盆地北部西部斜坡区已发现的富拉尔基油田、江桥油田、二站-阿拉新油气田、白音诺勒油气田和平洋油气田超出有效烃源岩的展布范围,距离生油凹陷30～100km,成藏要素一直是制约该区油气勘探的核心问题。本文以构造地质学、沉积地质学和石油地质学等理论为指导,开展了松辽盆地北部西部斜坡区构造特征、沉积特征、典型油气藏解剖研究。深入剖析了研究区油气成藏的主控因素,表明已发现的油气主要富集在四个鼻状构造带和超覆带上,储集砂体为三角洲前缘的分流河道砂体、河口坝、远砂坝和席状砂,指出该区油气成藏和富集程度受构造和沉积砂体类型双重控制。典型油气藏解剖表明,该区油气藏类型丰富,主要发育微幅度构造油藏、岩性-构造油藏、构造-岩性及岩性上倾尖灭等油气藏类型。结合构造、断裂、沉积及油气运移等因素,建立了研究区油气成藏模式,指出不整合面、断层和砂体是油气输导通道,为今后该区油气勘探指明了方向。
Exploration confirmed that the Fulaerji Oilfield, Jiangqiao Oilfield, Erzha-Allaxin Oilfield, Baiyinleule Oil and Gas Field and the Pingyang Oil and Gas Field that have been found in the western slope of the northern Songliao Basin have exceeded the distribution range of available source rocks, Oil depressions 30 ~ 100km, reservoir forming factors have been restricting the area of oil and gas exploration of the core issues. Guided by the theories of tectonics geology, sedimentary geology and petroleum geology, this paper carried out the study on the tectonic and sedimentary characteristics of the western slopes of the northern Songliao Basin and the typical reservoir research. In-depth analysis of the major controlling factors of hydrocarbon accumulation in the study area shows that the discovered oil and gas are mainly concentrated in four nose-shaped structural belt and overlying belt, and the reservoir sand body is distributary channel sand body in the delta front. The estuary dam , The far sand bar and the sand-like sand, pointing out that the degree of hydrocarbon accumulation and enrichment in this area is controlled by the type of structural and sedimentary sand bodies. The typical reservoir shows that there are abundant types of oil and gas reservoirs in the area, mainly developing micro-amplitude structural reservoirs, lithologic-structural reservoirs, tectono-lithology and uplifting lithologic types. Based on such factors as tectonics, faults, sedimentation and hydrocarbon migration, the hydrocarbon accumulation pattern in the study area is established. It is pointed out that the unconformity, faults and sand bodies are the channels for oil and gas transportation, pointing out the direction for future oil and gas exploration in this area.