Improved Detectivity for Detecting Gas Hydrates Using the Weighted Differential Fields of the Marine Controlled-Source Electromagnetic Data
Improved Detectivity for Detecting Gas Hydrates Using the Weighted Differential Fields of the Marine Controlled-Source Electromagnetic Data
复制标题
利用海洋受控源电磁数据的加权差分场提高天然气水合物的探测能力
DOI：
10.3390/jmse10020161
复制
发表时间：
2022-01
影响因子：
2.9
通讯作者：
Ying Liu
中科院分区：
文献类型：
--
作者：
Gang Li;Fugui Tang;Chun-Feng Li;Wen Lei;Ying Liu
天然气水合物被视为一种新的能源，但它也可能是主要的温室气体之一，因为它的解离可能会向大气中释放甲烷。此外，随着天然气开采后地质构造的稳定，天然气水合物的大量解离也可能给海上基础设施带来严重的危险。因此，在钻探和开采天然气水合物之前，有必要对其及其对环境的影响进行调查。天然气水合物勘探通常采用地球物理地震反射资料。利用地震反射资料中的模拟海底反射体(BSR)可以有效地识别天然气水合物。然而，BSR仅用于识别水合物的底边界，很难估计其在水合物稳定带内的空间分布和饱和度。海洋可控源电磁(CSEM)数据适合于探测天然气水合物，因为在天然气水合物或游离气的存在下，海底的电阻率显著增加。在这项研究中，应用加权差分场方法来提高识别天然气水合物的探测率。数值试验表明，电磁场的差异可以有效地抑制浅海大气电波。因此，提高了有和没有天然气水合物目标的模型之间的场比所给出的探测率。
Gas hydrate is seen as a kind of new energy resources, yet it may also be one of the main greenhouse gases as its dissociation may release methane into the atmosphere. Furthermore, a severe hazard to offshore infrastructures may also be introduced by extensive gas hydrate dissociation associated with the stability of the geological structures after gas production. Therefore, it is essential to investigate the gas hydrate as well as its environmental impacts before drilling and extracting it. The geophysical seismic reflection data is usually used for exploring the gas hydrate. The gas hydrate can be effectively identified by the bottom simulating reflectors (BSRs) on seismic reflection data. However, the BSR is only for identifying the bottom boundary and it is difficult to estimate its space distribution and saturation within the hydrate stability zone. The marine controlled-source electromagnetic (CSEM) data is suitable for detecting the gas hydrate as the resistivity of the seafloor increases significantly in the presence of gas hydrate or free gas. In this study, a weighted differential-field method is applied to improve the detectivity for identifying the gas hydrate. Numerical tests show that the difference of the EM fields can effectively suppress the airwaves in shallow waters. Therefore, the detectivity given by the field ratio between the models with and without the gas hydrate target is enhanced.
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DOI：
--
发表时间：
2017-11
期刊：
--
影响因子：
--
作者：
Timo Zander
通讯作者：
Timo Zander
DOI：
--
发表时间：
1988
期刊：
--
影响因子：
--
作者：
M. Hovland;A. Judd
通讯作者：
M. Hovland;A. Judd
DOI：
10.1007/978-3-319-57852-1
发表时间：
2018
期刊：
Submarine Geomorphology
影响因子：
--
作者：
通讯作者：
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完美匹配层在三维海洋受控源电磁建模中的应用
DOI：
10.1093/gji/ggx382
发表时间：
2018
期刊：
Geophyscial Journal International
影响因子：
--
作者：
Gang Li;Yuguo Li;Bo Han;Zhan Liu
通讯作者：
Zhan Liu
影响因子：
3.7
作者：
Bedanta K. Goswami;K. Weitemeyer;S. Bünz;T. Minshull;G. Westbrook;S. Ker;M. Sinha
通讯作者：
Bedanta K. Goswami;K. Weitemeyer;S. Bünz;T. Minshull;G. Westbrook;S. Ker;M. Sinha