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| Extraction technology of seismic detection signal in land permafrost area: A case study of Halahu area in Qinghai |
| YUE Hang-Yu1, 2, ZHANG Kai1, 2, WANG Xiao-Jiang1, 2, WANG Kai1, 2, 3, ZHANG Bao-Wei1, 2, JIANG Chun-Xiang1, 2, LI Jin-Li1, 2 |
1.Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China;
2.National Modern Geological Exploration Technology Research Center,Langfang 065000,China;
3.College of GeoExploration Science and Technology,Jilin University,Changchun 130026,China |
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Abstract The natural gas hydrate in land permafrost of Halahu area in Qinghai is shallowly buried,and seismic effective signal is often submerged by the noise.Reflection signal related to the formation and hydrate can be effectively separated from the complex seismic wave,which is the foundation of seismic detailed interpretation and gas hydrate prediction.In this paper,the field data in Hahahu area are firstly analyzed,and the type and characteristics of the noise are summarized.Then,signal extraction flow is made.Some targeted technologies,such as noise attenuation,amplitude compensation,deconvolution and stack,are used for the pre-stack gathers so as to effectively suppress all kinds of noise and keep the reflected signal to the greatest extent.Seismic resolution,S/N ratio and fidelity of the results are enhanced,which help a lot for the seismic interpretation and gas hydrate prediction.
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Received: 08 September 2017
Published: 20 December 2017
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