摘要:
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。
Abstract:
A large number of documents and references are reviewed for revealing the main controlling factors of gas hydrate accumulation in the Makran accretionary wedge. It is found that the activity of thrust faults in the Makran accretionary wedge is gradually weakened from west to east and from south to north, together with the weakening of the amplitude and continuity of BSR. The occurrence of BSR is obviously controlled by faults. The Makran accretionary wedge is characterized by large thickness, shallow SMI interface, bubble structure of hydrate samples and thick free gas under BSR, indicating that there is sufficient gas source for gas hydrate to form. At the same time, the northward Arabia Plate Subduction at a low angle created a series of E-W aligned and parallel thrust faults and some small normal faults, that may provide migration pathways for deeper natural gas to move upwards. It is then concluded that tectonic action and fault activities are the main controlling factors for gas hydrate to accumulate in the Makran accretionary wedge
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