摘要:
俄罗斯萨哈林3号V区块位于东萨哈林-鄂霍茨克盆地中南部,是中俄第一个油气勘探合作项目,主要勘探层系中新统发育海相三角洲沉积体系,沉积相以三角洲前缘、前三角洲以及浅海相为主,构造演化主要经历了晚白垩世-古近纪的裂谷期、渐新世中晚期-上新世早期的转换拉伸期和早上新世以后-近代的转换拉伸期3个阶段,形成了近南北走向、东西分带的"两隆三凹"的构造格局.烃源岩以达耶-胡林组硅质页岩、威宁组和奥科贝凯组暗色泥岩为主,有机质丰度高,生烃能力强.中新统两套储盖组合为油气的聚集和保存提供了有利条件.圈闭类型以断层控制的背斜和断背斜为主.研究表明,油气的生成、运移、储盖组合、圈闭形成、保存条件等成藏配置关系合理,油气主要富集于两个构造带上,分别是维尼背斜构造带和南阿雅什构造带.
Abstract:
Block V,located in the south-central of East Sakhalin-Okhotsk basin in Russia,has one major Eocene deltaic sedimentary systems.The main sedimentary facies include delta front,prodelta plain and shallow marine facies.Block V experienced three main tectonic evolution phases including the rifting,transformation tensile,and inversion.The tectonic framework of the Block V is characterized by NS-trending and EW-zoning"two uplifts and three depressions".The quality marine source rocks in Block V are dominated by the Dae-Khurye formation siliceous shale in Oligocene,Uyni-Dagi formation dark shale in Lower Miocene and Okobykai-Nutovian Forma-tion dark shale in Middle Miocene.They feature in high organic abundance and strong hydrocarbon potential.Moreover,two reservoir-seal cap combinations in Miocene provide favorable conditions for effective hydrocar-bon accumulation and preservation.The main trap style in Block V is anticline trap controlled by faults.Study of thermal evolution of source rocks indicates that the timing of hydrocarbon generation,migration,trap formation and reservoir--seal cap combination is rational.The potential plays of Block V mainly occur in two structural belts including Veni anticline belt and South-Ayash anticline belt.
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