en.Wedoany.com Reported - A research team from the Guangzhou Marine Geological Survey published a paper in the Chinese Journal of Geophysics, systematically revealing the enrichment patterns and reservoir control mechanisms of natural gas hydrates and free gas using seismic-electromagnetic joint exploration technology. This provides key technical support for high-precision exploration and efficient development of natural gas hydrates in China's sea areas.
Seismic exploration of natural gas hydrates has limitations in identifying hydrate boundaries, gas migration pathways, and quantitatively evaluating saturation. Marine controlled-source electromagnetic (CSEM) methods are sensitive to high-resistivity anomalies and can effectively compensate for the shortcomings of seismic methods.
Based on high-quality electromagnetic field data and high-resolution 3D seismic data collected from the natural gas hydrate production test area in the South China Sea, the research team conducted joint inversion and interpretation studies of marine CSEM and multi-channel seismic data. The results show that the natural gas hydrate and free gas saturation obtained by the joint inversion method has a small mean error compared with logging-derived results. Furthermore, the study suggests that the fault system controls the vertical migration of thermogenic gas, directly determining the spatial distribution of natural gas hydrates and free gas.
This study is the first to systematically achieve collaborative interpretation of low-frequency and high-frequency marine CSEM, seismic, and logging methods in the Shenhu area, effectively compensating for the limitations of traditional seismic methods in identifying hydrate boundaries, gas migration pathways, and quantitatively evaluating saturation. It enhances the understanding of natural gas hydrate system accumulation mechanisms and improves the accuracy of resource assessment.
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