The event deposits from the Yanchangian lacustrine basin in the Ordos Basin
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摘要: 鄂尔多斯盆地延长期浊积岩、震积岩、凝灰岩等事件沉积垂向上均发育典型的沉积序列,可根据其沉积序列进行识别。其主要形成于长6期至长8期,平面上分布在盆地西南部的深湖区。从形成机制上看,构造运动触发了火山活动和强烈的地震。地震活动又触发(辫状河)三角洲前缘沉积物向深湖区移动,由牵引流转化为浊流。这几种事件沉积与油气聚集关系密切。浊积岩、震积岩具有一定的储集能力,构成深水区油气的主要储集体;而凝灰岩促进了优质烃源岩的形成,并加速其演化过程。Abstract: The turbidites, seismites and tuffs may be discriminated in terms of their vertical sedimentary sequences. The event deposits from the Yanchangian lacustrine basin in the Ordos Basin were initiated during the Chang-6 to Chang-8 stages. In a planar view, they are arranged in the deep-lake area in the southwestern part of the basin. The mechanisms for the formation of the event deposits have disclosed that the tectonic movements tend to give rise to the volcanic activities, followed by severe earthquakes. The earthquakes, in turn, may cause the braided delta front deposits to migrate toward the deep-lake area. All the event deposits outlined above are closely associated with hydrocarbon accumulation. The turbidites and seismites have certain reservoir potential, and thus may act as the main reservoir rocks in the deep-water areas. The tuffs may stimulate the formation and evolution of the excellent source rocks.
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Keywords:
- Ordos Basin /
- Yanchang Formation /
- event deposit /
- turbidity current /
- volcanic event /
- seismic event
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