地震海洋学技术对海底冷渗漏的初步研究

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Chen Jiangxin, Song Hai-bin, Guan Yongxian, Yang Sheng-xiong, Bai Yang, Geng Ming‐Hui
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引用次数: 6

摘要

海底冷渗漏广泛分布于全球大陆边缘海域。在这项研究中,我们采用传统的多通道地震反射(地震海洋学)方法对海底附近的水柱进行成像,以检测冷渗漏。在分析流体逸出构造的基础上,对其发育位置、地震反射特征及冷渗漏特征进行了描述和讨论。水柱的地震反射很弱;因此,对海底上下地震剖面采用两种不同的处理顺序:(1)几何定义、直接波衰减和振幅恢复、高通滤波、共中点分选、等速(海水声速)叠加,部分剖面采用叠后FK滤波;(2)数据质量控制、幅度恢复、6~100 Hz带通滤波器、多次衰减、反褶积、速度分析、正常移出校正、共同中点叠加、叠后噪声衰减、4~70 Hz带通滤波器和FX偏移。经过处理的部分然后在仔细调整颜色比例后沿着海底组装在一起。分析表明,活跃的冷渗漏主要呈现羽状、帚状和/或不规则形状,这些形状在水柱中具有微弱和混乱的地震反射。地震反射振幅有时增强;这可能是由于泥浆或颗粒在水柱中的悬浮。冷渗流活动通常与流体逸出构造有关,包括泥底辟、管道、断层、裂缝、气体烟囱、海底麻坑和泥火山。这表明流体从深层向浅层运移,流体在海底渗漏或逸出,形成了广泛的冷渗活动。本文的所有结果均来自对水柱和地层地震剖面的综合解释;然而,需要进一步的实地研究、理论模拟和实验来证实这些结论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A PRELIMINARY STUDY OF SUBMARINE COLD SEEPS BY SEISMIC OCEANOGRAPHY TECHNIQUES
Submarine cold seeps are widely distributed in the continental margin seas around the world. In this study, we apply a conventional multichannel seismic reflection (seismic oceanography) method to image the water column near the seafloor in order to detect cold seeps. In addition to analyzing the fluid escape structures, we also describe and discuss the development positions, seismic reflection characteristics as well as features of the cold seeps. The seismic reflection from the water column is very weak; therefore, the seismic sections above and below the seafloor are processed in two different sequences as follows:(1) geometry definition, direct wave attenuation and amplitude recovery, high-pass filter, common midpoint sorting, constant velocity (seawater sound velocity) stack, and post-stack FK filter in some sections; and (2) data quality control, amplitude recovery, 6~100 Hz bandpass filter, multiple attenuation, deconvolution, velocity analysis, normal move-out correction, common midpoint stack, post-stack noise attenuation, 4~70 Hz bandpass filter, and FX migration. The processed sections are then assembled together along the seafloor after carefully adjusting the color scale. The analysis shows that active cold seeps primarily present plume, broom, and/or irregular shapes that have weak and chaotic seismic reflections in the water column. The seismic reflection amplitude is enhanced at times; this could be attributed to the suspension of mud or particles in the water column. Cold seepage activities are typically associated with fluid escape structures, including mud diapirs, pipes, faults, fractures, gas chimneys, seabed pockmarks, and mud volcanoes. This indicates fluid migration from deep to shallow strata, fluid seepage or escape at the seafloor, as well as the formation of widespread cold seep activities. All the results herein are derived from a comprehensive interpretation of the seismic sections of the water columns and strata; however, further field studies, theoretical simulations, and experiments are required to confirm these conclusions.
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
期刊介绍:
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