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为研究冷泉活动区天然气水合物气泡羽状流产生的地震响应,通过含气泡介质声速模型及随机介质理论建立了羽状流水体模型.利用有限差分方法对模型进行了正演模拟,单炮地震记录上显示出羽状流产生的散射波,羽状流所在位置的散射波能量强,散射波能量较强部位旅行时极小值总是位于羽状流正上方,与激发点位置无关.炮集地震记录的叠前时间偏移剖面显示出羽状流的散射波能够清晰成像,且成像精度较高,这为进一步研究羽状流产生的地震响应奠定了基础,也为寻找天然气水合物提供了一条新的思路.
In order to study the seismic response of gas hydrate bubble plume in Lengquan active area, a plume flow body model was established by bubble medium velocity model and stochastic medium theory.The finite difference method was used to simulate the model, The record shows the scattered waves generated by the plume, the scattered wave energy at the location of the plume is strong, and the minimum value of the scattered waves with strong energy is always located just above the plume and has nothing to do with the location of the excitation point. The prestack time migration profile of the seismic record shows that the scattered waves of the plume can be clearly imaged and the imaging accuracy is high, which lays the foundation for further study on the seismic response generated by the plume and also provides a reference for finding gas hydrate New ideas.