Study on the Relationship Between Spectral Characteristics of Seismic Wave Field and Gas Content of Plume in Cold Seepage

doi:10.19657/j.geoscience.1000-8527.2021.145

Abstract

Abstract:

To study the seismic response characteristics of plume and inversion of gas content in plume, we used the single- and multi-channel seismic data in seismic migration profile of the actual plume to firstly analyze the time-domain seismic waveform characteristics and the seismic wave field spectral characteristics. The plume time-domain waveform shows scattering features and wide spectrum, showing the characteristics of scattering wave with more forks. Gas content was inversed through the existing relation model of gas content and amplitude attribute, and the plume seismic spectral parameters were extracted. Finally, the correlation between the plume seismic spectral parameters and gas content was analyzed. The results show that the gas content variation would change each of the spectral parameter, and all the spectral parameters (except dominant bandwidth) are positively correlated with the gas content, and the correlation curves of total energy and limited bandwidth energy have the best fitting. Distribution of the dominant frequency and the maximum amplitude spectrum is scattered, but the fitting results still show a positive correlation trend. Negative correlation is presented between the dominant bandwidth and the gas content. The time-domain waveform characteristics, seismic wave field spectral characteristics, and the relationship between seismic signal spectral parameters and plume gas content strengthens the foundation for seismic detection and gas content inversion of plume.

Key words: cold seepage, plume, seismic spectral analysis, gas content, correlation analysis

CLC Number:

LIU Yilin, LI Canping, GOU Limin, WANG Hongtao, ZENG Xianjun, CHEN Fengying, GUO Zihao, TIAN Xinyu. Study on the Relationship Between Spectral Characteristics of Seismic Wave Field and Gas Content of Plume in Cold Seepage[J]. Geoscience, 2022, 36(01): 172-181.

Figures/Tables 7

Fig.1 Geographic location of the Qiongdongnan Basin and seismic survey area (black rectangle) (after reference[35])

Fig.2 Seismic migration profile of bubble plume in the survey area of South China Sea (data provided by Liu Xuewei (CUGB))

Fig.3 Seismic signal and spectra of the CDP2550 and CDP2750 trace

Fig.4 Correlations between spectral parameters and gas content of the seismic signal from the 100th trace

Fig.5 Correlations between spectral parameters and gas content of the seismic signal from the 200th trace

Fig.6 3D-time domain waveform (a) and 3D-spectra (b) of plume_42 module

Fig.7 Correlations between spectral parameters and gas content of seismic signals for each module

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