文献类型：期刊文献

英文题名：Continuous Characterization of Water-Column Velocity in Cold Seep Plumes Using Pre-Stack Allied Elastic Impedance Inversion

作者：Li, Canping[1];Ma, Miantao[1];Wang, Rui[1];Zhang, Hairong[1];Liu, Yilin[1];Chang, Liang[2];Liang, Jinqiang[3];Chen, Fengying[1];Bao, Binghuang[1]

机构：[1]Guangdong Ocean Univ, Sch Elect & Informat Engn, Zhanjiang 524088, Peoples R China;[2]PetroChina, Jilin Oilfield Co, Res Inst Geophys Explorat, Songyuan 138000, Peoples R China;[3]Natl Engn Res Ctr Gas Hydrate Explorat & Dev, Guangzhou 511458, Peoples R China

年份：2026

卷号：14

期号：18

外文期刊名：JOURNAL OF MARINE SCIENCE AND ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001891312700001)、、EI(收录号：20263921561953)、Scopus(收录号：2-s2.0-105051700182)、WOS

基金：This research is financially supported by Guangdong Basic and Applied Basic Research Foundation, grant number 2023A1515012041, the Zhanjiang Marine Young Talent Innovation Program, grant number 2025R02101, and the supported by program for scientific research start-up funds of Guangdong Ocean University, grant number 06032112311.

语种：英文

外文关键词：cold seep plume; water-column velocity; allied elastic impedance (AEI); pre-stack inversion; bubble scattering

外文摘要：Bubbles in submarine cold-seep plumes cause strong scattering, attenuation, and poor continuity in water-column seismic responses, hindering continuous two-dimensional characterization of acoustic properties. Using multichannel seismic data from the Shenhu area, northern South China Sea, this study proposes a conductivity-temperature-depth (CTD)-constrained, layer-wise two-angle allied elastic impedance (AEI) inversion method to reconstruct water-column velocity. Based on the scattering-equivalent AEI theory, a two-angle equation is derived for layer-wise estimation of water-column velocity, thereby providing a theoretical basis for the subsequent inversion. A relative-amplitude-preserving workflow mitigates bubble-induced attenuation and random scattering, while pre-stack time migration produces common reflection point (CRP) angle gathers. Coherent scattered energy after imaging is parameterized by the local scattering half-angle. Small-angle and large-angle gathers are selected according to effective angular coverage for AEI inversion. CTD-derived seawater velocity and density provide AEI constraints, and the normalized two-angle AEI equation yields a continuous velocity section. Results show velocities of 1460-1560 m/s, with pronounced vertical stratification, relatively weak lateral variation, and agreement between inverted and CTD-derived velocity trends. Within the 0-1800 ms water-column time window, the root-mean-square difference between the inverted and CTD-derived velocities is 18.19 m/s. Combining the lateral continuity of multichannel seismic data with high-accuracy CTD-derived physical-property constraints enables continuous two-dimensional velocity reconstruction in bubble-scattering water columns and offers a new approach for observing cold-seep velocity structure and geophysically characterizing bubble-plume activity.