关键词: 隐蔽油气藏, 形成条件, 烃源岩, 储集层, 盖层, 柳屯洼陷

Abstract: Subtle reservoir means various reservoirs that are difficult to be recognized and discovered by current exploration techniques. Thin-bed sandbody with gravity flow characteristics are developed in Liutun sag of Dongpu IOepression. It's interbedded frequently with greyish black mudstone in vertical section, sandbody and saline rock linkup with each other laterally, which exists favorable conditions forming subtle reservoirs. Based on core data, log-grog data,seismic data and laboratory analysis data,the authors study the geology characteristics of Hu 96 and Hu 108 wells area in Liutun sag and point out the geological basis of forming subtle reservoir. Study shows that hydrocarbon source rocks in the area are very thick where fanning delta sand body,alluvial fan sand body and deep-water turbidite fan sand body are developed. Conditions of reservoir and cap rocks are good. Cap rock lateral seal is good. This area is a favorable area for forming subtle reservoirs.

Key words: subtle reservoir, forming condition hydrocarbon source rock, reservoir rock, cap rock, Liutun sag