吴起—定边地区长8储层油气富集规律研究

发布时间：2018-09-11 11:52

【摘要】：吴起—定边地区位于鄂尔多斯盆地中部,长8是该区近年来发现的重点含油层系之一,本文综合运用层序地层学、地球化学、沉积学、储层地质学及成藏动力学等石油地质多学科的理论和方法,对吴起-定边地区长8储层分布特征、构造特征、沉积储层特征、油藏主控因素及石油富集规律进行了系统研究,搞清了长8层石油成藏主控制因素,认为研究区油藏富集除了受烃源岩分布范围控制外,圈闭条件及运移条件是成藏的关键:①发育的烃源岩为长8储层石油成藏提供了充足的油源条件,同时控制了油气的富集范围;②三角洲前缘相带发育的水下分流河道、河口坝、远砂坝,横向上连通差,纵向上可叠加连片,为油气的富集提供了丰富的储层,同时又是形成岩性、物性圈闭的有利区带;③研究区长8储层油藏类型以上生下储型为主;过剩压力是促使油气运移的动力,临近高压的低压漏斗区是油气运移的指向部位。明确了研究区长8储层的勘探潜力,揭示了研究区长8油气富集规律。
[Abstract]:Wuqi-Dingbian area is located in the middle of Ordos basin. Chang8 is one of the key oil-bearing strata discovered in this area in recent years. In this paper, sequence stratigraphy, geochemistry and sedimentology are used synthetically. Based on the theories and methods of multi-disciplinary petroleum geology, such as reservoir geology and reservoir dynamics, the distribution characteristics, structural characteristics, sedimentary reservoir characteristics, reservoir control factors and petroleum enrichment law of Chang8 reservoir in Wuqi-Dingbian area are systematically studied. The main controlling factors of oil reservoir formation in Chang 8 layer are clarified. It is considered that the reservoir enrichment in the study area is not only controlled by the distribution range of hydrocarbon source rock, but also controlled by the source rock distribution range. The trap and migration conditions are the key to reservoir formation. The source rocks developed at 1: 1 provide sufficient oil source conditions for oil accumulation in Chang 8 reservoir, and control the enrichment range of oil and gas, the subaqueous distributary channel developed along the delta front facies belt. Estuarine dam, far sand dam, poor transversal connection, and vertical superposition can provide abundant reservoir for oil and gas enrichment, and are favorable zones for forming lithologic and physical traps. The excess pressure is the driving force to promote oil and gas migration, and the low pressure funnel area near high pressure is the direction of oil and gas migration. The exploration potential of Chang 8 reservoir in the study area is defined, and the oil and gas enrichment law of Chang 8 reservoir in the study area is revealed.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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