羌塘盆地隆鄂尼—昂达尔错古油藏逆冲推覆构造隆升
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Thrust and Uplift of the Lung’erni Angdarco Paleo Oil Reservoirs in the Qiangtang Basin
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    摘要:

    沿隆鄂尼—昂达尔错古油藏发现大量逆冲推覆构造,如北雷错东西两侧、隆鄂尼西北侧、比洛错东南侧、鲁雄错东西两侧,侏罗系烃源岩及含油白云岩沿低角度缓倾斜断层自北向南逆冲推覆于上白垩统红层之上,昂达尔错西北侧中侏罗统含油碳酸盐岩和碎屑岩自北向南逆冲推覆于三叠系灰黑色碎屑岩之上,形成不同规模的逆冲岩席、逆冲岩片、飞来峰和构造窗。高分辨率二维地震反射剖面显示,隆鄂尼—昂达尔错古油藏深部发育多重逆冲推覆构造;比洛错中侏罗统含油白云岩沿顶部双重推覆构造自北向南运移7~11km和12~15km,分别形成隆鄂尼古油藏和德如日古油藏;下伏三叠系及石炭系—二叠系沿底部双重推覆构造自北向南发生大规模逆冲推覆,前锋被向北逆冲的反向断层切割错断。野外观测表明,隆鄂尼—昂达尔错古油藏与羌中隆起北侧油苗带之间发育大量侏罗系逆冲岩席和飞来峰;深地震反射剖面构造解释进一步揭示,三叠系和侏罗系海相烃源岩经历自北羌塘向南羌塘长距离逆冲推覆构造运动,自北向南逆冲推覆运动导致侏罗系烃源岩及中侏罗统含油白云岩构造隆升,形成昂达尔错、隆鄂尼、德如日等古油藏。隆鄂尼—昂达尔错古油藏逆冲推覆及构造隆升主要发生于晚白垩世—古近纪。

    Abstract:

    Regional thrust systems have been discovered along the Lung’erni Angdarco belt of paleo oil reservoirs in the southern Qiangtang Basin. The Jurassic oil bearing dolomite and marine hydrocarbon source rocks thrust southward along gentle dipping faults over the Upper Cretaceous red beds in the eastern and western Beileico, northwestern Lung’erni, southeastern Bilogco Lake and surrounding areas of the Luxungco Lake, and the Middle Jurassic oil bearing carbonate and clastic sedimentary rocks thrust southward over the Triassic dark clastic rocks in northwestern Angdarco Lake, which formed variety of thrust sheets, thrust slices, nappes and structural windows. High resolution 2D seismic reflection profile reveals duplex thrust systems at different depths occur in the Lung’erni Angdarco paleo oil reservoirs. The oil bearing dolomite of the Middle Jurassic Buqu Formation in Bilogco moved southward along the upper duplex thrust for about 7~11 km and 12~15 km, resulting in the formation of the Lung’erni and Deruri palaeo oil reservoirs. The underlying Triassic and Carboniferous Permian sheets thrust in a large scale from north to south along lower duplex thrust, with frontiers of the thrust offset by the northward thrust faults. Field observation indicates that many thrust sheets and nappes of Jurassic limestone and dolomite occur in the transition zone between the paleo oil reservoir belt in the south of Central Qiangtang Uplift and the oil seepage zone in the north of Central Qiangtang Uplift. The explanation for the deep seismic reflection profile further suggests that the Triassic and Jurassic marine hydrocarbon source rocks in the northern Qiangtang Basin thrust southward over the Central Qiangtang Uplift to form the Middle Jurassic oil bearing dolomite and paleo oil reservoirs in the Beileico and Luxungco Lakes, southern Qiangtang basin. It can be inferred that uplift of the oil bearing dolomite and Jurassic hydrocarbon source rocks caused by regional southward thrust in the Late Cretaceous Early Tertiary led to formation of the Lung’erni Angdarco paleo oil reservoirs.

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吴珍汉,刘志伟,赵珍,季长军,叶培盛.2016.羌塘盆地隆鄂尼—昂达尔错古油藏逆冲推覆构造隆升[J].地质学报,90(4):615-627.
WU Zhenhan, LIU Zhiwei, ZHAO Zhen, JI Changjun, YE Peisheng.2016. Thrust and Uplift of the Lung’erni Angdarco Paleo Oil Reservoirs in the Qiangtang Basin[J]. Acta Geologica Sinica,90(4):615-627.

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  • 在线发布日期: 2016-04-26
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