Research on Seismic Wave Attenuation in Gas Hydrates Layer Using Vertical Cable Seismic Data
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Vertical cable seismic (VCS) data are the most suitable seismic data for estimating the quality factor Q values of layers under the sea bottom by now. Here the quality factor Q values are estimated using the high-precision logarithmic spectrum ratio method for VCS data. The estimated Q values are applied to identify the layers with gas hydrates and free gas. From the results it can be seen that the Q value in layer with gas hydrates becomes larger and the Q value in layer with free gas becomes smaller than layers without gas hydrates or free gas. Additionally, the estimated Q values are used for inverse Q filtering processing to compensate the attenuated seismic signal’s high-frequency component. From the results it can be seen that the main frequency of seismic signal is improved and the frequency band is broadened, the resolution of the VCS data is improved effectively.
KeywordsGas hydrates vertical cable seismic (VCS) quality factor Q logarithmic spectrum ratio method (LSRM) inverse Q filtering
This research was funded by the national key research and development program of China (2017YFC0307405) and the China Geological Survey Project (Grant number 201100307).
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