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为了探讨马克兰增生楔天然气水合物的主控因素,对收集的大量文献资料进行了整理和分析,发现马克兰增生楔由西到东、由南往北逆冲断裂的活动性具有逐渐减弱的趋势,BSR的振幅和连续性同样具有逐渐减弱的趋势,因此,马克兰增生楔BSR的产状主要受断裂构造的影响。马克兰增生楔沉积厚度大,SMI界面浅,水合物样品具有气泡结构以及BSR之下存在较厚的游离气表明,该区天然气水合物的气源充足。同时,低角度的北向俯冲造就的E—W向平行排列的南向逆冲断层以及小型正断层等为天然气向上运移提供了通道。由此可知,构造作用是马克兰增生楔天然气水合物的主控因素。
In order to investigate the main controlling factors of the Pleistocene wedge gas hydrate in the Mackay, a large amount of literatures were collected and analyzed. It is found that the activity of the Mackenzie wedge from west to east and thrust from south to north is gradually weakened In the trend, the amplitude and continuity of BSR also tend to decrease gradually. Therefore, the occurrence of BSR in the Markland accretion wedge is mainly affected by the fault structure. The thickening of the Markland accretion wedge, the shallow SMI interface, the bubble structure of the hydrate samples and the presence of thick free gas beneath the BSR suggest that the source of gas hydrate in this area is abundant. At the same time, the low-angle northward subduction of the E-W provides parallel channels of southward thrust and small normal faults for the upward migration of natural gas. It can be seen that the tectonic action is the main controlling factor of the Marklanian accretionary wedge gas hydrate.