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| An analysis of seismic attribute characteristics of terrestrial gas hydrate in Muli area |
| JIANG Chun-Xiang1, 2, LI Pei1, 2, WANG Xiao-Jiang1, 2, RONG Li-Xin1, 2, CHEN De-Yuan1, 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 Seismic exploration of natural gas hydrate in permafrost regions in land field is a new field of energy exploration by seismic methods.In order to study the seismic attributes of natural gas hydrate in land field,the authors used the methods of seismic reflection and synthetic seismogram analysis with high precision,and then analyzed the seismic recordings for seismic attributes.The results of experimental research show that the seismic reflection wave group formed by formation of natural gas hydrate has the characteristics of higher frequency and weaker amplitude,and the synthetic seismogram and measured seismic profile are consistent well with each other.In the fluid model,the slope of the curve is positive with the amplitude of reflected waves from the top interface of the reservoir varying with the incident angle,and the slope of the curve is negative in the bottom interface.In contrast,the curve characteristics of the consolidation skeleton model are just the opposite.On the sections of instantaneous amplitude and instantaneous frequency,the amplitudes of frequency properties of reflected waves from the hydrate formation are consistent with those of seismic profiles.On the instantaneous phase section,the phase of reflected waves in hydrate formation has no obvious change,which indicates that the instantaneous phase properties do not reflect hydrate.The corresponding frequency of reflected waves in the high value regions of the energy half-time section is relatively high,which indicates that the energy attenuation is relatively strong when the reflected waves pass through the hydrate formation with a high degree of fragmentation.In conclusion,the results of this study will provide technical support for the seismic exploration of natural gas hydrate in China's permafrost area.
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Received: 08 September 2017
Published: 20 December 2017
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