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| Experiment on high-resolution reflection seismic exploration technique for natural gas hydrate in Gemucuo area |
| LI Pei1, 2, JIANG Chun-Xiang1, 2, RONG Li-Xin1, 2, WANG Xiao-Jiang1, 2, LI Jin-Li1, 2 |
1.National Modern Geological Exploration Technology Research Center,Langfang 065000,China;
2.Institute of Geophysical and Geochemical exploration,Chinese Academy of Geological Sciences,Langfang 065000,China |
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Abstract Gemucuo area is located on the northern margin of the central uplift belt in Qiangtang basin.The results of regional geological survey of the area show that the area is a favorable area of gas hydrate formation.In order to detect the gas hydrate,the authors carried out high resolution seismic reflection detection test in the area.High quality original seismic data were obtained in the process of seismic data acquisition by using such means as the observation system of Intermediate excitation and bilateral symmetry and the receive mode of long spread and shot trace intervals as well as the excitation mode of large tonnage vibrator.In seismic data processing,according to the characteristics of permafrost area in the plateau,the authors conducted a large number of tests for parameters,and used a combination of various means of treatment and the reflection seismic time profiles,thus obtaining high signal-to-noise ratio.The seismic reflection wave group in the seismic time profiles clearly reflects the features of subsurface geological structure.The authors investigated and delineated the favorable target area for gas hydrate accumulation in Gemucuo.The test results show that the high resolution seismic reflection detection technology is a very effective means for detection of natural gas hydrate,and hence it can serve as a reference technology for the seismic exploration of natural gas hydrates in permafrost regions in plateau in future.
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Received: 08 September 2017
Published: 20 December 2017
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