南沙海域曾母盆地构造样式特征及其与油气聚集和圈闭的关系
Typical structural styles and their relationships with hydrocarbon accumulation and traps in the Zengmu basin, Nansha sea area.
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摘要: 南沙海域曾母盆地发育各种类型的构造样式，本文研究与油气聚集和圈闭关系密切的典型构造样式。以盆地构造运动的力学性质为依据，将该盆地的构造样式分为三大类，即伸展构造、挤压构造和走滑构造。伸展构造样式有断块构造和箕状构造；挤压构造样式有褶皱构造、冲断构造和底辟构造；走滑构造样式有花状构造。各种构造样式特征分析结果表明．大部分构造样式可形成能够俘获、圈闭油气的局部构造，部分构造样式除了能形成圈闭以外，其中充填的沉积物还有利于油气的生成一由于这些构造样式的发育时间旱于烃源岩的生烃期和大规模的排烃期，因此极易俘获油气而成为有利的油气聚集带和有效的油气圈闭。Abstract: There are various structural styles in the Zengmu basin of the Nansha sea area. This paper discusses hydrocarbon accumulation and trap-related, typical structural styles. Three structural styles in the basin may be distinguished, i.e. extensional structural style (including fault block structure and listric structure), compressive structural style (including folds, thrusts and diapiric structure), and strike-slip structural style (including efflorescent structure), according to the mechanical properties of structural movements in the basin. Analysis of the characteristics of the typical structural styles indicates that local structures capable of capturing and trapping hydrocarbon can be formed in most structures of the structural styles, while sediments filling in a part of them are favorable for the formation of hydrocarbon besides that they can form traps. Because these structural styles formed earlier than the hydrocarbon-generating period of source rocks and period of large-scale hydrocarbon expulsion, they are very liable to capturing petroleum and become favorable petroleum accumulation zones and effective petroleum traps.
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