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库车前陆盆地乌什凹陷东部依拉克凝析气藏和神木1油藏为构造—岩性油气藏,白垩系舒善河组储层沉积相及物性变化快,油气水关系复杂,储层物性和含油性控制因素不清。根据常规储层物性分析、基于高压压汞和氮气吸附的微观孔喉分析和储层定量荧光对含油性的定量分析结果,对储层物性和含油性的主控因素进行了分析。研究表明:储层沉积相、岩性是控制储层物性的关键因素,沉积相上以扇三角洲前缘河口坝微相、分流河道微相和辫状河三角洲前缘分流河道微相的储层物性最好,岩性上以位于扇三角洲前缘亚相的粗、中砂岩储层物性最好。研究区本地无烃源岩,油气从东部的塔拉克地区经不整合面—断裂输导体系组合长距离运移至乌什地区,储层含油性一方面受沟通油气源的断裂控制,油气主要聚集在断裂附近的局部高部位;另一方面受储层物性的控制,在油气藏内部同一砂组范围内储层物性控制了含油性差异。往研究区东部即油气来源的方向,寻找有利的构造—岩性圈闭是该区下一步的勘探方向,加强目的层构造图和砂体沉积相的精细刻画是该区勘探开发研究的关键。
In the Kuqa foreland basin, the Ilak Condensate Gas Reservoir and the Shenmu-1 Reservoir in the eastern Wushi Sag are structural-lithologic reservoirs. The sedimentary facies and physical properties of the Cretaceous Shujianhe Formation are rapidly changing. The relationship between hydrocarbon and water is complex, Oily control factors unclear. Based on the analysis of physical properties of conventional reservoirs, the quantitative analysis of oil content based on microscopic pore-throat analysis by high-pressure mercury intrusion and nitrogen adsorption and quantitative fluorescence of reservoir, the main controlling factors of reservoir physical properties and oil-containing properties were analyzed. The results show that: reservoir sedimentary facies and lithology are the key factors controlling reservoir physical properties. Sedimentary facies are characterized by fan delta front mouth ridge mouth microfacies, distributary channel microfacies and braided delta front distributary channel microfacies The physical property is the best. The lithology is characterized by coarse and medium sandstone reservoirs in the subfacies of fan delta front. In the study area, there is no source rock locally. Hydrocarbons migrate long distances to the Wushi area from the Talaq area in the east through the combination of unconformity-fault systems. The oil-bearing property of the reservoir is controlled by the fracture of the communication oil and gas source on the one hand, Which accumulates in the local high part near the fault. On the other hand, it is controlled by reservoir physical properties, and reservoir physical properties within the same sand group within the reservoir control the oil-bearing difference. Looking toward the source of oil and gas in the eastern part of the study area, searching for favorable tectonic-lithologic traps is the exploration direction in the next step. It is the key to the exploration and development in this area to strengthen the tectonic map of the target layer and the fine characterization of sandstone sedimentary facies.