FEATURES OF MIGRATION SYSTEM IN XIHU SAG AND ITS CONTROL ON HYDROCARBON ACCUMULATION
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摘要: 输导体系是东海西湖凹陷油气勘探研究中的重要内容之一。断裂、砂岩层和不整合面作为西湖凹陷输导体系的基本要素,共同构成了盆地各成藏单元流体纵、横向运移的复杂输导网络系统。根据断裂、砂岩层、不整合面等输导要素在空间和时间上的组合关系,总结出顺向断层阶梯型、反转断层丘型、调节断层"Y"型和"T"型4种典型输导体系样式。输导体系对油气成藏的控制作用主要表现为:输导体系类型及分布样式决定着油气藏层位的分布;输导体系组成地质要素控制着油气藏类型的分布。Abstract: The migration system, as one of the key research targets in oil and gas exploration, has been studied in the Xihu Sag, the East China Sea Shelf Basin. Fault, sandstone and unconformity, the basic types of migration system in the Xihu Sag, always work together vertically and laterally to form the migration network for a hydrocarbon accumulation. According to the spatial and temporal relations of the basic elements of fault, sandstone and unconformity, 4 kinds of migration system are recognized in the Xihu Sag. They are the terrace-like migration system along a forward fault; dome-like migration system along a reversed fault, "Y"-type and "T"-type of migration systems along an adjustment fault. The migration system is a controlling factor on hydrocarbon accumulation. Firstly, it will decide the distribution patterns of hydrocarbon accumulation strata. Secondly, the geological factors of the migration system will control over the distribution pattern of hydrocarbon accumulations.
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Key words:
- Xihu Sag /
- migration system /
- reservoir /
- East China Sea shelf
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