西部凹陷东部陡坡带砂砾岩体成藏特征勘探精细化研究

发布时间：2018-11-05 09:03

【摘要】：该研究区块构造上位于辽河西部凹陷东部陡坡带的中北段及陈家洼陷区,构造面积166.2km2。先后发现了太古界潜山油层,下第三系沙河街组油层和东营组油层。其中,沙河街组油层是冷家油田的主力油层。钻井揭露的地层自下而上依次为:太古界,中生界,新生界下第三系房身泡组、沙河街组、东营组,上第三系馆陶组、明化镇组和第四系地层。冷家堡稠油藏的形成首先受控于陡坡带特定的构造背景控制下沉积相特征。该油田有两种沉积体系:陡坡型扇三角洲—滑塌浊积扇和轴向重力流水道沉积体系。冷家堡陡坡带深切断层较为发育,直接为油气提供垂向运移的条件。该构造带近源分布,又具有较好的油源条件,构造、沉积等多种要素的匹配,为该区油气的富集提供了保障。陡坡带深切断层控制下的扇三角洲沉积相决定的中厚-块状底水、中厚层边底水稠油藏发育模式。本区发育有源控成藏和断控成藏两种成藏模式,烃源岩分布和沉积相带控制了油气的富集程度,具有较大的勘探潜力。该区油层的发育特点是,以陈家断层为界,冷家西部洼陷带含油层系少,以沙三段油层发育为主,油层厚度薄;冷家断裂背斜带含油层系多,四套含油层系均有发育,而且油层厚度大,尤以沙三段油层最为发育。冷家堡陡坡带深切断层较为发育,直接为油气提供垂向运移的条件。该构造带近源分布,又具有较好的油源条件,构造、沉积等多种要素的匹配,为该区油气的富集提供了保障。
[Abstract]:The study block is structurally located in the central northern section of the eastern steep slope zone of the western Liaohe depression and the Chenjia depression with a structural area of 166.2 km2. Archean buried hill reservoir, Lower Tertiary Shahejie formation and Dongying formation have been discovered successively. Among them, Shahejie formation is the main reservoir of Lengjia Oilfield. The strata exposed by drilling are Archean Mesozoic Lower Tertiary Fangshenbao formation Shahejie formation Dongying formation Upper Tertiary Guantao formation Minghuazhen formation and Quaternary strata. The formation of Lengjiapu heavy oil reservoir is firstly controlled by the sedimentary facies characteristics under the specific tectonic background in the steep slope zone. There are two sedimentary systems in the oilfield: steep slope fan delta-sloughing turbidite fan and axial gravity flow channel sedimentary system. The deep faults in the Lengjiapu steep slope zone are relatively developed, which directly provide the conditions for the vertical migration of oil and gas. The structure belt is near source distribution and has better oil source conditions, structure, sedimentation and other elements matching, which provides a guarantee for the oil and gas enrichment in this area. The fan delta sedimentary facies controlled by deep fault in steep slope zone determine the development pattern of heavy oil reservoir with medium thick-block bottom water and middle thick bed edge bottom water. There are two types of pool-forming models in this area: active controlled reservoir formation and fault-controlled reservoir formation. The distribution of source rock and sedimentary facies zone control the degree of oil and gas enrichment and have great exploration potential. The characteristics of reservoir development in this area are as follows: the Chenjia fault is the boundary, the western Lengjia depression has less oil-bearing strata, and the oil layer of the third member of Shahejie formation is mainly developed, and the thickness of the reservoir is thin. There are many oil-bearing strata in Lengjia fault anticline zone, four sets of oil-bearing strata are developed, and the thickness of oil layer is large, especially in the third member of Shahejie formation. The deep faults in the Lengjiapu steep slope zone are relatively developed, which directly provide the conditions for the vertical migration of oil and gas. The structure belt is near source distribution and has better oil source conditions, structure, sedimentation and other elements matching, which provides a guarantee for the oil and gas enrichment in this area.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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