印度东部边缘Mahanadi近海天然气水合物和游离气的经验模式分解方法

IF 0.6 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Jitender Kumar, K. Sain
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引用次数: 0

摘要

经验模态分解(EMD)是一种有效的信号分析工具,它将数据分解成称为本征模态函数的单个模态,这些模态函数与对称和窄带波形相关,确保瞬时频率是平滑的和正的。然而,它的一些缺点阻碍了它的直接应用,即模式混合和分裂、混叠和端点伪影。为了克服这些问题,最近引入了两种变体,即集成EMD (EEMD)和完全集成EMD (CEEMD)。我们打算展示EMD在划定天然气水合物和含游离气沉积物带方面的应用。天然气水合物是一种冰状晶体物质,存在于沿外大陆边缘和永久冻土区的浅层沉积物中,被认为是世界未来可行的主要能源。海洋环境中的天然气水合物一般是通过地震剖面上的异常反射面来识别的,这种反射面称为海底模拟反射面。本研究以印度东部边缘Mahanadi盆地为例,表明EMD可以有效地用于天然气水合物和含气沉积物的区域划分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Empirical mode decomposition approach for delineating gas-hydrates and free gas in Mahanadi offshore, eastern Indian margin
Empirical mode decomposition (EMD) is an effective tool for signal analysis that splits the data into individual modes, called the intrinsic mode functions, which are associated with symmetric and narrow-band waveform ensuring that the instantaneous frequencies are smooth and positive. However, some negative features encumber its direct application namely the mode mixing and splitting, aliasing and endpoint artefacts. Two variants, ensemble EMD (EEMD) and complete ensemble EMD (CEEMD) have been recently introduced to overcome these problems. We intend to show the application of the EMD for demarcating the zones of gas-hydrates and free-gas bearing sediments. Gas-hydrates are ice-like crystalline substances that occur in shallow sediments along the outer continental margins and in the permafrost regions, and are considered as viable major future energy resources of the world. Gas-hydrates in marine environment are generally identified by an anomalous reflector, known as the bottom simulating reflector, on seismic section. The present study demonstrates that the EMD can be effectively utilised in demarcating the zones of gas-hydrates and free-gas bearing sediments with a field example in the Mahanadi basin of the eastern Indian margin.
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来源期刊
Exploration Geophysics
Exploration Geophysics 地学-地球化学与地球物理
CiteScore
2.30
自引率
0.00%
发文量
33
审稿时长
>12 weeks
期刊介绍: Exploration Geophysics is published on behalf of the Australian Society of Exploration Geophysicists (ASEG), Society of Exploration Geophysics of Japan (SEGJ), and Korean Society of Earth and Exploration Geophysicists (KSEG). The journal presents significant case histories, advances in data interpretation, and theoretical developments resulting from original research in exploration and applied geophysics. Papers that may have implications for field practice in Australia, even if they report work from other continents, will be welcome. ´Exploration and applied geophysics´ will be interpreted broadly by the editors, so that geotechnical and environmental studies are by no means precluded. Papers are expected to be of a high standard. Exploration Geophysics uses an international pool of reviewers drawn from industry and academic authorities as selected by the editorial panel. The journal provides a common meeting ground for geophysicists active in either field studies or basic research.
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