Abstract: The Jizhong Depression is one of the hydrocarbon-rich depressions in Bohai Bay Fault Basin and has a great potential of residual hydrocarbon resources because of the low-degree exploration of stratigraphic and lithologic reservoirs.The analyses on reservoir-forming conditions and hydrocarbon distribution of the stratigraphic and lithologic reservoirs in this area suggest that this depression is characterized by three sets of regional source rocks,seven depositional systems,multi-phase structural movement and depositional break,as well as several angular unconformities.Those properties offer the favorable geological condition for forming the stratigraphic and lithologic reservoirs.Based on the origin and geometry of traps,the Paleogene stratigraphic and lithologic reservoirs in Jizhong Depression were divided into three types of lithologic reservoir,stratigraphic reservoir and compound reservoir.The stratigraphic and lithologic reservoirs concentrated in the trough belt and middle-lower part of slope and distributed around the source trough.The favorable play and exploration direction were predicted by comprehensive analysis method and proved by drilling.Four full-scale stratigraphic and lithologic reservoirs were founded.The distinct exploration benefits were obtained.

Key words: Jizhong Depression, Paleogene, depositional system, stratigraphic and lithologic reservoir, reservoir-forming condition, exploration direction

摘要： 冀中坳陷是渤海湾断陷盆地中的富油气坳陷之一,其地层岩性油藏勘探程度较低,剩余油气资源勘探潜力较大。对冀中坳陷古近系成藏条件的研究表明,该坳陷发育3套区域性烃源岩、7种沉积体系、多期构造运动及多次沉积间断,为地层岩性油藏的形成提供了有利的地质条件。按照圈闭成因及其几何形态,将冀中坳陷古近系发育的地层岩性油藏划分为岩性油藏、地层油藏和复合油藏3种类型。地层岩性油藏主要富集在沉积洼槽带和斜坡带中低部位,并围绕生油洼槽呈环带状分布。根据冀中坳陷古近系地层岩性油藏成藏特征及分布规律,运用综合分析方法预测出了其有利勘探区带和方向,经钻探新发现了4个整装规模储量的地层岩性油藏,勘探效益显著。

关键词: 冀中坳陷, 古近系, 沉积体系, 地层岩性油藏, 成藏条件, 勘探方向