| 羌塘盆地逆冲推覆构造特征及油气资源效应 |
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| 引用本文： | 季长军,吴珍汉,刘志伟,赵珍.羌塘盆地逆冲推覆构造特征及油气资源效应[J].地质力学学报,2019,25(S1):66-71. |
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| 作者姓名： | 季长军 吴珍汉 刘志伟 赵珍 |
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| 作者单位： | 中国地质科学院地质力学研究所, 北京 100081;国土资源部古地磁与古构造重建重点实验室, 北京 100081;中国地质科学院页岩油气调查评价重点实验室, 北京 100081,中国地质科学院, 北京 100037,中国地质科学院, 北京 100037,中国地质科学院, 北京 100037 |
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| 基金项目： | 中国地质调查局地质调查项目（DD20160161） |
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| 摘 要： | 羌塘盆地南羌塘坳陷地表古油藏作为了解盆地石油地质条件的良好窗口，经过多年来对古油藏详细解剖，通过详细的地表构造填图、二维地震和地质浅钻综合揭示了盆地存在大量的逆冲推覆构造。古油藏为盆地自北向南逆冲推覆至地表的大型构造岩席，主要表现为中生代海相地层推覆至晚白垩—中新世湖湘红层之上，古油藏含油层位是中侏罗布曲组砂糖状含油白云岩。针对古油藏石油地质条件解剖表明逆冲推覆构造虽然破坏了上坪油气藏，但是该构造活动不但能够使地层增厚利于有效烃源岩二次生烃，并对下坪地层有效遮挡封盖，同时构造活动有利于优质白云岩储集层和构造圈闭的形成，为二次成藏创造了良好的生储盖时空匹配关系，有利于逆冲推覆型油气藏的形成。
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| 关 键 词： | 逆冲推覆构造 古油藏 含油白云岩 侏罗系 羌塘盆地 青藏高原 |
STRUCTURAL FEATURES OF THRUST NAPPES IN THE QIANGTANG BASIN AND HYDROCARBON RESOURCES EFFECT |
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| JI Changjun,WU Zhenhan,LIU Zhiwei and ZHAO Zhen.STRUCTURAL FEATURES OF THRUST NAPPES IN THE QIANGTANG BASIN AND HYDROCARBON RESOURCES EFFECT[J].Journal of Geomechanics,2019,25(S1):66-71. |
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| Authors: | JI Changjun WU Zhenhan LIU Zhiwei and ZHAO Zhen |
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| Institution: | Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China;Key Lab of Shale Oil and Gas Geological Survey,Chinese Academy of Geological Sciences,Beijing 100081, China,Chinese Academy of Geological Sciences, Beijing 100037, China,Chinese Academy of Geological Sciences, Beijing 100037, China and Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | As a good chance to understand the petroleum geological conditions of the basin, the paleo-oil reservoir in the south Qiangtang depression of the Qiangtang basin has been researched in detail for many years, and a large number of thrust nappe structures are revealed through detailed structural mapping, 2D seismic and geological shallow drilling. The paleo-oil reservoir is a large tectonic bed where the basin overthrust to the surface from north to south. It is mainly menifested in Mesozoic Marine strata overlying the late cretaceous-miocene lacustrine red beds, and the middle Jurassic oil-bearing dolomite is the main high quality reservoir of the paleo-oil reservoir. Analysis of the petroleum geological conditions of the paleo-oil reservoirs show that although thrust nappe structure destroys hanging wall anticline reservoirs, it makes stratum thickening, beneficial to the secondary hydrocarbon generation in effective source rocks and the effective shield and seal for the footwall flat. At the same time, it is conducive to the formation of high-quality dolomite reservoirs and structural traps, creating a good spatial-temporal matching relationship between generation, reservoir and cover for secondary accumulation, and contributing to the formation of thrust nappe type reservoirs. |
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| Keywords: | thrust nappe structure paleo-oil reservoir oil-bearing dolomite Jurassic Qiangtang basin Tibetan plateau |
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