Analysis on Sedimentary Systems and Hydrocarbon Accumulation of Palaeogene, Chengbei Sag
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摘要: 为了研究渤海湾盆地埕北凹陷的勘探前景和油气成藏规律，基于埕北凹陷古近系隐蔽油气藏的勘探实践，探讨了三个问题：埕北凹陷沉积演化史和沉积体系类型；沉积相分类和特征；油藏类型与成藏模式。通过对勘探地质资料的研究，得出了以下结果：埕北凹陷古近系经历了湖盆断陷早期、断陷扩张深陷期、断陷盆地萎缩期、湖盆断陷晚期四个阶段；埕北凹陷古近系发育了近岸水下扇沉积相、滩坝沉积相、扇三角洲沉积相、浊积扇沉积相、三角洲沉积相等五类主要的沉积相；古近系可分为陡坡带成藏体系和缓坡带成藏体系，油藏类型主要包括上倾尖灭油气藏、断块油气藏以及超覆不整合油气藏。以上结论表明埕北凹陷油气成藏明显受到沉积特征控制，油气易在上倾尖灭砂岩和不整合处成藏。Abstract: In order to study the exploring foreground and hydrocarbon accumulation rules of the Chengbei sag, Bohai Bay Basin, based on the exploring practice of Palaeogene subtle reservoir, the following topics are discussed in this research: the sedimentary evolution history and sedimentary system types of Chengbei Sag; sedimentary facies demarcation and characteristics; reservoir types and accumulation pattern. The conclusions were drawn from the study on the exploring and geological data of Chengbei Sag: The sedimentary evolution history shows that Chengbei Sag experienced four stages: lake basin prerift period, rift spreading period, rift contracting period, and lake basin postrift period; Five types sedimentary facies grows in Palaeogene of Chengbei Sag: nearshore subaqueous fan, beachbars, fandelta, deepwater turbidite fan, and delta; The Palaeogene reservoir can be divided into two accumulation systems: northern abrupt slope and southern gentle slope. The Palaeogene reservoir can be divided into three types: updip pinchout sandstone reservoir, fault block reservoir, and overlap unconformity reservoir. These results show the influence of the sedimentary characteristics to the hydrocarbon accumulation. Hydrocarbon will accumulate easily in the updip pinchout sandstone and overlap unconformity area.
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Key words:
- sedimentary systems /
- sedimentary facies /
- hydrocarbon accumulation /
- Chengbei Sag
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