柴达木盆地西部古近系生烃凹陷的边界效应与油气聚集模式

发布时间：2018-01-14 07:35

本文关键词：柴达木盆地西部古近系生烃凹陷的边界效应与油气聚集模式　出处：《石油学报》2017年11期 　论文类型：期刊论文

【摘要】：柴达木盆地西部发育NW和NNW两组方向的古近系生烃凹陷,生烃凹陷内部充填了厚层、软弱、富含有机质的膏、盐和泥质沉积物,而生烃凹陷外侧则是坚硬的基底和较粗的砂质沉积物,两者构成显著的力学强度对比。在新近纪至第四纪挤压作用下,这种的显著力学强度对比引发了生烃凹陷内外不同的构造变形行为,并在地表形成截然不同的构造地貌,称之为生烃凹陷的"边界效应"现象,是识别和判定生烃凹陷的重要依据。英雄岭是柴西地区规模最大、油气最富集的新生代构造带,崛起于NW向生烃凹陷之上;柴西北区块则位于该生烃凹陷北侧,软弱的膏、盐和泥质沉积物或不发育,或显著减薄,因而形成南翼山、大风山和尖顶山等一系列长轴形构造带。此外,英雄岭西段的滑脱构造变形强烈,而英雄岭东段则转变为基底卷入式构造,可能暗示古近系生烃凹陷的充填成分自西向东发生了变化。生烃凹陷边界效应控制的油气聚集主要分布于3类位置:第1类是沿着生烃凹陷边缘,近源聚集于边界效应引起的构造高部位;第2类是生烃凹陷外侧,源外聚集于三角洲、滨浅湖向半深湖过渡区域的构造和岩性圈闭;第3类是生烃凹陷内部,源内聚集于古近系内幕的构造和岩性圈闭。因此,柴西地区应采取"满凹控藏、3种类型、分带聚集"的思路,针对上述3类位置实施整体评价和勘探部署。
[Abstract]:NW and NNW two group development direction of Western Qaidam Basin in the Paleogene hydrocarbon generating sag, hydrocarbon generation sag filled with thick, soft, organic rich cream, salt and mud sediments, and the hydrocarbon generating sag is hard outside basement and coarse sandy sediments, mechanical strength constitute a significant contrast between the two in the Neogene to Quaternary. Under compression, the mechanical strength of the contrast significantly raised the hydrocarbon generation sag both in different deformation behaviors and different tectonic landforms formed on the surface, called the hydrocarbon generation depression "edge effect", is an important basis for the identification and determination of hydrocarbon generation depression. The hero the ridge is the largest in Western Qaidam basin, the oil and gas enrichment of Cenozoic tectonic belt, the rise in NW to hydrocarbon generation depression; northwest of Qaidam block is located in the north of the source sag, soft paste, salt and mud sediment or development, or a significant reduction, Thus the formation of Nanyishan and Jiandingshan Dafengshan, a series of long axis tectonic belt. In addition, the western part of the decollement Yingxiongling strongly deformed, while Yingxiongling East into the basement involved structure, may suggest that the Paleogene West filling ingredient source sag changed to the East. The oil and gas source sag the boundary effect control gathered mainly distributed in 3 types of position: first is along the hydrocarbon generating sag edge, near source accumulation high position of the structure caused by the boundary effect; the second category is the hydrocarbon generation depression outside source gathered in the Delta, shallow lake and semi deep lake to the transition structure and lithologic traps in the area; the third category is the hydrocarbon generating sag, structural and lithologic traps in source gathered in the Paleogene inside. Therefore, the western Qaidam region should adopt the "sag reservoirs, 3 types of zoning aggregation" ideas, according to the above 3 position to implement the overall evaluation and exploration deployment.

【作者单位】：中国石油勘探开发研究院;中国石油青海油田公司勘探开发研究院;中国石油集团东方地球物理勘探有限责任公司研究院地质研究中心;
【基金】：国家自然科学基金项目(No.41172173,No.41472176) 中国石油天然气股份有限公司重大科技专项(2016E-0101)资助
【分类号】：P618.13
【正文快照】： (1.PetroChina Research Institute of Petroleum Exploration and Development,Beijing100083,China;2.Research Instituteof Petroleum Exploration and Development,PetroChina Qinghai Oilfield Company,Gansu Dunhuang736202,China;3.Geological Research Center,BGP INC

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