绥中36-1地区油气富集特征及成藏主控因素分析

SZ36-1地区已发现的油气藏平面上主要分布在辽西低凸起上,纵向上主要分布于东二下亚段。油气藏以构造油气藏为主,主要烃源岩层系为古近系沙河街组一段和三段,主要储层类型为三角洲砂体,东二下段上部区域性展布的泥岩构成盖层。油气藏以油为主,油藏多为常压下形成,油气成藏期较晚。采用油藏解剖和油气分布与成藏条件之间空间匹配关系研究的方法,对该区油气成藏的主控因素和模式进行了研究。研究表明:该区油气成藏的主控因素是断裂、储盖组合以及输导体系。油气藏横向分布主要受储层控制,而纵向分布主要受断裂控制。受断裂和凸起的影响,该区主要为凸起披覆背斜型成藏模式。

An Analysis of Main Controls and Accumulation Models in the SZ36-1 Hydrocarbon Reservoir

The hydrocarbon reservoirs which have been found in the SZ36-1 region are located on Liaoxi low uplift in lateral and in the lower section of the second member of Dongying Formation. The reservoirs found in this area is mainly structural type, the principleSsourceSrock is the first and the third member of the Shahejie Formation of Paleogene, the main reservoir type is delta sand body, the caprock is constituted by the regional distributed mudstone which located in the upper section of the second member of Dongying formation. Oil reservoirs are mostly in normal pressure and are possess characteristic of late hydrocarbon accumulation. Hydrocarbon accumulation is mainly controlled by fault reservoir-cap rock combination and petroleum migration pathways. Lateral distribution of hydrocarbon reservoirs is mostly controlled by reservoir rocks, while the vertical distribution is controlled by fault. Under the influence of the fault and the uplift , the main accumulation model of this region is drape-anticline type.