Seismic Wave Numerical Simulation in Seafloor Cold Seepage Plume Flow With Bubbly Liquid Acoustic Equation

Abstract

Summary Seafloor bubble plume in cold seepage is closely related to the distribution of natural gas hydrates, and they can indicate the boundary of the hydrate stable zone, which is an important area of energy exploration in the future. At present, the seismic response of cold seepage plume flow is mainly carried out by numerical simulation. However, the acoustic velocity model with the bubble medium and the random medium theory cannot universally describe the physical properties of the cold seepage, and acoustic wave equation adopted in previous methods is not applicable for the accurate seismic wave numerical simulation. In order to accurately simulate the seismic response and analyze the seismic response characteristics of seafloor cold seepages, the Keller-Miksis bubble vibration model is proposed to describe the motion state of bubbles under the action of acoustic wave. Considering the interaction between bubbles, the new process of cold seepage bubble model is established. On this basis, bubbly liquid acoustic wave equation is introduced into the seismic wave numerical simulation in seafloor cold seepage. The numerical results indicate that the new equation can simulate the cold seepage plume flow in precise term.