Influence of Himalayan Orogeny on Oil & Gas Forming in Kuqa Depression, Tarim Basin
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摘要: 喜马拉雅运动是指新生代以来的构造运动, 是塔里木盆地库车坳陷构造及其圈闭形成的主要动力, 对库车坳陷油气成藏起重要的作用.喜马拉雅运动强烈的构造挤压作用造成的快速沉降和埋藏促使油气开始生成; 喜马拉雅运动产生的大量裂缝是致密低渗透储集层的主要渗流通道和有效的储集空间, 对改善储集性能有重要的作用; 喜马拉雅运动不仅形成了油气运移的通道和油气聚集的场所, 而且还是油气运移的主要驱动力, 控制了油气藏成排成带的分布规律; 喜马拉雅晚期产生的断层和构造抬升作用, 是该区天然气散失和盐上次生油气藏形成的主要因素.Abstract: Himalayan orogeny refers to the tectonic movement from Cenozoic, and it is the main power responsible for the formation of depressions and traps. Therefore, it plays an important role in oil and gas forming in Kuqa depression, Tarim basin. Rapid sedimentation and embedding by violent tectonic extrusion of Himalayan orogeny caused oil and gas to form. A lot of fractures formed by the orogeny are the main seepage and the valid storage space to improve the capability of low-permeability reservoir. Fault related with fold formed in the early Himalayan orogeny and ended in its late stage is the most favorable structural trap. Himalayan orogeny not only formed migration passage and accumulation location of oil and gas in Kuqa depression, but also was the main power for oil and gas migration. Meanwhile, it controlled oil and gas pool to be distributed in rows and zones. Faults and tectonic uplift in the late stage of Himalayan orogeny are the main factors on gas dissipating and the secondary oil and gas pool forming above salt layer in Eogene.
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Key words:
- Himalayan orogeny /
- oil and gas forming /
- Kuqa depression /
- Tarim basin
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图 2 库车坳陷不同层位岩心裂缝密度统计
Fig. 2. Fracture density counted by cores in different strata in Kuqa depression
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