Abstract
In hydrate-bearing sediments, the elastic wave attenuation characteristics depend on the elastic properties of the sediments themselves on the one hand, and on the other hand, they also depend on the hydrate occurrence state and hydrate saturation. Since the hydrate-bearing sediments always have high porosity, so they show significant porous medium characteristics. Based on the BISQ porous medium model which is the most widely used model to study the attenuation characteristics in the porous media, we focused on p-wave attenuation in hydrate-bearing sediments in Shenhu Area, South China Sea, especially in specific seismic frequency range, which lays a foundation for the identification of gas hydrates by using seismic wave attenuation in Shenhu Area, South China Sea. Our results depict that seismic wave attenuation is an effective attribute to identify gas hydrates.
Highlights
With the enhancement of exploration technology for gas hydrate resources, research on wave attenuation in hydratebearing sediments is being paid more and more attention
In Nankai Trough, central Japan, Matsushima [4] proved that elastic wave showed strong attenuation in hydrate-bearing sediments by logging data, in Blake Ridge and in the Makran Accretionary Prism, Arabian Sea, Wood et al [5] and Sain and Singh [6] obtained week attenuation of seismic wave in hydrate-bearing sediments by using seismic data
In this paper a detailed discussion has been made to explore the gas hydrate effects on rock properties and p-wave attenuation in hydrate-bearing sediments, especially in seismic frequency range, which lays a foundation for the identification of gas hydrates by using seismic wave attenuation in Shenhu Area, South China Sea
Summary
With the enhancement of exploration technology for gas hydrate resources, research on wave attenuation in hydratebearing sediments is being paid more and more attention. The most commonly used model to study elastic wave propagation in porous media is the BISQ model which combines the Biot flow and the squirt flow In this model, the relationship between wave attenuation and rock properties has been discussed in a macroscopic perspective. We have implemented BISQ porous medium model to study Shenhu Area, South China Sea. In this paper a detailed discussion has been made to explore the gas hydrate effects on rock properties and p-wave attenuation in hydrate-bearing sediments, especially in seismic frequency range, which lays a foundation for the identification of gas hydrates by using seismic wave attenuation in Shenhu Area, South China Sea. The actual application result shows that seismic wave attenuation is an effective attribute to identify gas hydrates
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