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南肯尼斯油田是哈萨克斯坦南图尔盖盆地重要的油田之一,为典型的构造—岩性地层复合型油气藏,油气成藏受大型走滑断裂带影响,其油气成藏方面的研究对扩大该区勘探、开发规模及丰富走滑裂谷盆地油气成藏理论具有重要意义。基于南肯尼斯油田的石油地质特征分析,通过油气藏解剖,总结了其油气分布特征,认为白垩系下达乌尔组M-Ⅱ层的油气分布受构造和岩性双重因素控制,主要表现为3个特征:1在构造高部位存在气顶;2油层厚度受砂体厚度和物性控制;3油藏类型为构造和岩性地层复合型油气藏。侏罗系阿克沙布拉克组J-0-1层、J-0-2层内砂体横向连续性较差,平面上存在非均质性,油气分布以薄层透镜状为主。结合研究区构造演化和断裂发育特征,对影响不同层系油气成藏的主控因素进行了探讨,认为成藏主要受3个方面因素控制:1断层活动控制白垩系上、下达乌尔组成藏组合油气成藏;2储层岩性尖灭带控制岩性油气藏平面分布;3区域性不整合面控制侏罗系岩性地层油气藏垂向发育。
South Kenneth Oilfield is one of the important oilfields in South Turku Basin of Kazakhstan. It is a typical tectonic-lithostratigraphic complex oil and gas reservoir affected by large-scale strike-slip faults, and its research on hydrocarbon accumulation It is of great significance to expand the exploration and development scale and enrich the theory of hydrocarbon accumulation in strike-slip rift basins. Based on the analysis of petroleum geology in South Kenneth Field, the oil and gas distribution characteristics are summarized through the reservoir anatomy. It is concluded that the hydrocarbon distribution of the M-II layer in the Lower Wuer Formation in the Cretaceous is controlled by the dual factors of tectonics and lithology. The main features are 3 Features: 1 There is a gas cap at the top of the structure; 2 The thickness of the oil layer is controlled by the thickness and physical properties of the sand body; 3 The reservoir type is a composite reservoir of structural and lithologic strata. The J-0-1 and J-0-2 sand bodies in the Aksarabulak Formation in the Jurassic had poor horizontal continuity and heterogeneity in the plane, with the distribution of oil and gas being mainly lenticular. Based on the tectonic evolution and fracture development characteristics of the study area, the main controlling factors that affect the hydrocarbon accumulation in different strata are discussed. It is believed that the hydrocarbon accumulation is mainly controlled by three factors: (1) the fault activity controls the Upper Cretaceous and the Lower Dam Formation Combination of hydrocarbon accumulation; (2) lithologic pinch-out zone controls the lithology distribution of lithologic reservoirs; (3) regional unconformity controls the vertical development of Jurassic lithostratigraphic reservoirs.