针对二连盆地大庙凹陷的构造发育格局以及油气高产富集规律认识不清的难题,利用沉积相研究以及测井地震联合反演的技术手段,研究了二连盆地大庙凹陷的构造发育格局、储层发育模式以及油气高产富集规律,明确了二连盆地大庙凹陷的资源潜力和有利目标区。研究结果表明: 大庙凹陷早期主要为冲积扇—扇三角洲—湖泊沉积体系,其中,冲积扇扇中的砂砾岩、远砂坝中的细砂岩及滨浅湖中的砂砾岩是良好储层发育段,半深湖—深湖泥岩是良好生油层发育段;二连盆地大庙凹陷有利油气富集区主要围绕富烃洼陷分布,并优选出二连盆地大庙凹陷阿尔善组、腾一段为有利勘探目标,预计资源量为150.44×104t,部署井位1口,预计产能可达10 t/d。研究成果对拓展二连盆地有利油气资源接替区具有重要意义。
In view of poor understanding of the tectonic development pattern and hydrocarbon accumulation law in Damiao Sag, Erlian Basin, the tectonic development pattern, reservoir development mode, and hydrocarbon accumulation law and high yield of Damiao Sag, Erlian Basin were studied based on the sedimentary facies study and logging-seismic joint inversion technology, so as to determine the resource potential and favorable target areas of Damiao Sag, Erlian Basin. The study results show that alluvial fan - fan delta - lake sedimentary system is mainly developed in the early stage of Damiao Sag; the glutenite in the alluvial fan, the fine sandstone in the remote distal bar and the glutenite in the shallow lake are developed with excellent reservoirs, and the semi-deep and deep lake mudstone is developed with good source beds; the favorable hydrocarbon accumulation is mainly distributed around hydrocarbon-rich sags, and Ai′ershan Formation and Member 1 of Tengge′er Formation are selected as the favorable exploration targets in Damiao Sag, Erlian Basin, with an estimated resource of 150.44×104t, one well deployed, and an expected production capacity of 10 t/d. The study results are of great significance for the development of replacement areas of favorable oil and gas resources in Erlian Basin.
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