Quantitative estimation of bubble volume fraction of submarine seep plumes by modeling seismic oceanography data  

作　　者：Tonggang HAN Jiangxin CHEN Leonardo AZEVEDO Bingshou HE Huaning XU Rui YANG 

机构地区：[1]Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 266100,China [2]Key Laboratory of Gas Hydrate,Ministry of Natural Resources,Qingdao Institute of Marine Geology,Qingdao 266071,China [3]Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China [4]CERENA,DECivil,Instituto Superior Técnico,Universidade de Lisboa,Av.Rovisco Pais,Lisbon 1049-001,Portugal

出　　处：《Journal of Oceanology and Limnology》2023年第2期673-686,共14页海洋湖沼学报（英文）

基　　金：Supported by the Natural Science Foundation of Shandong Province(No.ZR2022MD074);the Laboratory for Marine Mineral Resources;Qingdao National Laboratory for Marine Science and Technology(No.MMRKF201810);the National Natural Science Foundation of China(No.41606077);the National Key R&D Program of China:HighPrecision Characterization Technology of Gas Hydrate Reservoir(No.2017YFC0307406-03);supported by the Shandong Province Taishan Scholar Construction Project。

摘　　要：Submarine seep plumes are a natural phenomenon in which different types of gases migrate through deep or shallow subsurface sediments and leak into seawater in pressure gradient.When detected using acoustic data,the leaked gases frequently exhibit a flame-like structure.We numerically modelled the relationship between the seismic response characteristic and bubble volume fraction to establish the bubble volume fraction in the submarine seep plume.Results show that our models are able to invert and predict the bubble volume fraction from field seismic oceanography data,by which synthetic seismic sections in different dominant frequencies could be numerically simulated,seismic attribute sections(e.g.,instantaneous amplitude,instantaneous frequency,and instantaneous phase)extracted,and the correlation between the seismic attributes and bubble volume fraction be quantitatively determined with functional equations.The instantaneous amplitude is positively correlated with bubble volume fraction,while the instantaneous frequency and bubble volume fraction are negatively correlated.In addition,information entropy is introduced as a proxy to quantify the relationship between the instantaneous phase and bubble volume fraction.As the bubble volume fraction increases,the information entropy of the instantaneous phase increases rapidly at the beginning,followed by a slight upward trend,and finally stabilizes.Therefore,under optimal noise conditions,the bubble volume fraction of submarine seep plumes can be inverted and predicted based on seismic response characteristics in terms of seismic attributes.

关 键 词：seismic oceanography submarine seep plumes bubble volume fraction seismic response characteristics seismic attribute analysis quantitative analysis 

分 类 号：P618.13[天文地球—矿床学] P631.46[天文地球—地质学]