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| Seismic wave field features and potential analysis of mineralization of gas hydrate in Halahu permafrost zone |
| WANG Xiao-Jiang1, 2, ZHANG Kai1, 2, LI Pei1, 2, JIANG Chun-Xiang1, 2, RONG Li-Xin1, 2 |
1.National Modern Geological Exploration Technology Research Center,Langfang 065000,China;
2.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China |
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Abstract Halahu depression in the south of Qilian Mountain is a key region in gas hydrate exploration.The results of seismic exploration show that the shallow lateral velocity reversion discloses that the frozen zone is well developed,and seismic reflection section and three-instantaneous information reveal that Halahu Depression is a composite basin:After the Indosinian orogenic eruption and the Himalayan movement,the Late Paleozoic-Mesozoic residual basin which was developed on the crystalline base of the Caledonian phase further formed as a foreland basin deep in the south and shallow in the north,with the deposition of Cenozoic loose sediments about 300~1200 m in thickness.Under the influence of complex tectonic movement,the strata were severely damaged;in addition,the quality of hydrocarbons source rock was also poor,the formation time of the permafrost was too late to preserve natural gas because the early faults could lead to gas escaping and regional cap layer was nonexistent.In summary,applying hydrate mineralization theory,the authors consider that the metallogenic potential is poor.
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Received: 08 September 2017
Published: 20 December 2017
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