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科技导报  2015 

青海三露天井田天然气水合物成藏的构造控制作用

DOI: 10.3981/j.issn.1000-7857.2015.06.015, PP. 91-96

Keywords: 三露天井田,天然气水合物,构造控制,构造-岩性组合

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Abstract:

自2008年中国首次在青藏高原祁连山冻土区钻获天然气水合物实物样品,木里煤田三露天井田已成为研究热点地区之一,但对于天然气水合物形成及保存的控制因素及分布规律的研究尚浅,阻碍了资源的勘探与开发。通过对三露天井田天然气水合物钻孔实际资料的统计,分析了井田构造格局,提出了研究区天然气水合物的形成过程,综述了构造对其成藏的控制作用。结果表明1)天然气水合物是由烃类气体聚集成藏后随着青藏高原的快速隆起而抬升进入温压稳定带后形成水合物藏;2)研究区的构造分区分带性控制了天然气水合物在平面上的展布规律,构造运动决定了中侏罗煤系的沉降-生烃史和温压稳定带的形成,构造形态则可以为烃类气体的聚集提供通道、盖层及储存空间,而后期构造作用又会对前期形成的气藏及天然气水合物藏造成破坏。

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