摘要
松辽盆地西部超覆带,目前已发现并已圈定出控制储量面积的油藏,主要是砂岩上倾尖灭油藏。该类型油藏的砂体,在松辽盆地平缓东倾的西部斜坡上呈南北向条带状展布。砂岩条带沿上倾方向相变为泥岩,形成南北向展布的泥质岩条带。泥质岩条带象一道屏障,起到了阻止油气继续向西运移的遮挡作用。在泥质岩分布带的东侧形成了地层圈闭,使油气聚集在砂岩的上倾部位,形成了砂岩上倾尖灭油气藏。在西部超覆带地区应以寻找砂岩上倾尖灭油气藏为主,同时注意岩性圈闭与微幅度构造圈闭相结合的油气藏则是最有意义的。
The oil reservoirs, discovered and idenfied by delineation currently, in the western overlapping region in Songliao Basin, are mainly up-dip pinch-out sandstone reservoirs. These reservoirs which exhibit a bolt in shape extend in a north-south ward direction on the western slop which is sloped gently toward east. Sandstone strips change grodually to shale in the up-dip direction so that north-southward shale strips are formed. Shale strips, acting as barriers, stop the westward migration of oil and gas to form stratigraphic traps, east of these strips. Thus, oil and gas accumulate in the up-dip part of sandstone to form pinch-out reservoirs. In this region such up-dip pinch-out reservoir should be the main projects for petroleum exploration. In addition, those reservoirs formed due to a combination of stratigraphy and microclosure is another project to be explored.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1989年第4期9-13,共5页
Petroleum Exploration and Development
