TYPES AND STRUCTURAL CHARACTERISTICS OF BRINK SAGS IN FAULTED BASIN
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摘要: 断陷盆地中的断陷构造层往往是由众多断块组成,在伸展掀斜过程中,每个块体都是一个相对独立的沉降和沉积单元。由于各个块体所处的构造位置、边界断层走向、以及演化过程中的运动学特点不同,有些块体在整个断陷过程中长期继承性掀斜沉降,成为主力生油气中心的主体凹陷;有些块体在断陷演化过程中被边缘化,表现为沉降幅度较小或剥蚀量较大。根据成因和所起的构造作用,可以将边缘凹陷分为4种类型,即废弃型、调节型、过渡型和改造型。Abstract: The faulted structural strata are usually constituted by numerous fault-blocks in faulted basin.In the extending process,each faultblock is a comparatively independent sedimentary and subsidence center.In the process of rift-subsidence evolvement,some fault-blocks succession rift and subside for a long period,becoming the host sags of the primary oil source center,and the others show the less range of subsidence or strong denudation,becoming the brink sags,all these just because of the difference in structure position,boundary fault strike,and dynamics characteristics.According to the formation and the function in structural activity,the brink sags can be divided into abandoned-type,adjusted-type,transitional-type,and reconstructed-type.
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Key words:
- structural characteristics /
- genetic type /
- brink sag /
- faulted basin /
- the Bohai Bay Basin
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