Numerical simulation of bubble plumes in overlying water of gas hydrate in the cold seepage active region  

作　　者：LI CanPing LIU XueWei GOU LiMin WANG XiangChun YIN JunJie XIE ChengLiang 

机构地区：[1]Laboratory of Ocean Remote Sensing and Information Technology, Guangdong Ocean University [2]School of Geophysics and Information Technology, China University of Geosciences (Beijing) [3]School of Ocean Sciences, China University of Geosciences (Beijing) [4]China United Coalbed Methane National Engineering Research Center Limited Liability Company

出　　处：《Science China Earth Sciences》2013年第4期579-587,共9页中国科学（地球科学英文版）

基　　金：supported by National Basic Research Program of China(Grant No. 2009CB219505);Program for Science and Technology Development of Zhanjiang (Grant No. 2011C3107006);the Talents Introduction Special Project of Guangdong Ocean University (Grant No. 0812182)

摘　　要：To study the seismic responses produced by gas hydrate bubble plumes in the cold seepage active region, we constructed a plume water body model based on random medium theory and acoustic velocity model of bubble medium. The plume water body model was forward simulated by finite difference. Seismic records of single shot show the scattered waves produced by the plume. The scattered wave energy is strong where the plume exists. Where the scattered wave energy is stronger, the minimum of travel time is always above the plume, which has no relationship with the shot's position. Seismic records of shot gathers were processed by prestack time migration. The migration section shows that the scattered waves produced by plumes can be imaged distinctly with higher accuracy. These researches laid a foundation for further study on the seismic responses produced by plumes and provided a new approach for the identification of gas hydrate.To study the seismic responses produced by gas hydrate bubble plumes in the cold seepage active region, we constructed a plume water body model based on random medium theory and acoustic velocity model of bubble medium. The plume water body model was forward simulated by finite difference. Seismic records of single shot show the scattered waves produced by the plume. The scattered wave energy is strong where the plume exists. Where the scattered wave energy is stronger, the min- imum of travel time is always above the plume, which has no relationship with the shot＇s position. Seismic records of shot gathers were processed by prestack time migration. The migration section shows that the scattered waves produced by plumes can be imaged distinctly with higher accuracy. These researches laid a foundation for further study on the seismic responses produced by plumes and provided a new approach for the identification of gas hydrate.

关 键 词：gas hydrate PLUME cold seepage scattered wave numerical simulation 

分 类 号：P744.4[天文地球—海洋科学] TS262.5[轻工技术与工程—发酵工程]