Pore-Water Geochemical Gradients of Sulfate, Calcium, Magnesium, and Iodide Correlated With Underlying Gas Hydrate Potential: A Case Study of the Shenhu Area, South China Sea
Pore-Water Geochemical Gradients of Sulfate, Calcium, Magnesium, and Iodide Correlated With Underlying Gas Hydrate Potential: A Case Study of the Shenhu Area, South China Sea
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硫酸盐、钙、镁、碘化物孔隙水地球化学梯度与底层天然气水合物潜力的关系——以南海神狐海域为例
DOI：
10.3389/feart.2022.882207
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发表时间：
2022-07
影响因子：
2.9
通讯作者：
Pibo Su
中科院分区：
文献类型：
--
作者：
Xinyu Ai;Rihuan Zha;Yijun Lai;Tao Yang;Pibo Su
海洋沉积物孔隙水的地球化学剖面被认为是天然气水合物赋存的重要指标。在世界各地的天然气水合物地区，硫酸盐、钙、镁浓度随深度的降低主要是直接或间接由甲烷厌氧氧化（AOM）引起的。研究区普遍存在异常高的碘化物浓度梯度，反映出该区巨大的产甲烷潜力。因此，我们探讨了在区域天然气水合物形成勘探中使用硫酸盐、碘化物和自生碳酸盐沉淀梯度作为天然气水合物指示剂的可行性。我们在南海天然气水合物区使用硫酸盐、钙加镁和碘化物梯度测试了天然气水合物识别标准。研究区域探险的孔隙水梯度等值线图用于将关键梯度与底层天然气水合物的出现相关联。结果表明，指标等高线图所指示的最大潜在天然气水合物与GMGS1和GMGS3探险队的发现吻合较好。这意味着该地球化学方法在天然气水合物勘探中的潜在适用性。此外，我们还确定了南海一个有希望进行未来天然气水合物调查的区域。这是硫酸盐、钙加镁和碘化物梯度首次集体应用于天然气水合物地体，特别是南海大面积区域。我们相信这项研究成果将有利于未来天然气水合物的勘探，并会引起其他研究人员的极大兴趣。
Geochemical profiles in pore water of marine sediments have been considered as, important indicators of gas hydrate occurrence. In the gas hydrate area around the world, the decrease of sulfate, calcium, and magnesium concentrations with depth mainly results directly or indirectly from the anaerobic oxidation of methane (AOM). The ubiquitous abnormally high concentration gradients of iodide in the research area reflect the large methane-generating potential of the area. Thus, we explore the feasibility of using gradients of sulfate, iodide, and authigenic carbonate precipitation as indicators for gas hydrate in the regional exploration of gas hydrate formation. We test the criterion in the gas hydrate zone in the South China Sea (SCS) for the recognition of gas hydrate by using the gradients of sulfate, calcium plus magnesium, and iodide. Contour maps of pore-water gradients from expeditions in the study area are used to correlate the key gradients to underlying gas hydrate occurrence. The results show that the largest potential gas hydrate indicated by the contour maps of the indicators are well consistent with the discovery of GMGS1 and GMGS3 expedition. It implies the possible applicability of this geochemical method in gas hydrate exploration. Also, we identify a promising area in the South China Sea for future gas hydrate investigations. It is the first collective application of the gradients of sulfate, calcium plus magnesium, and iodide to a gas hydrate terrane, especially to a large area of the SCS. We believe that the result of this research will benefit the future exploration of gas hydrate and will arouse a lot of interest from other researchers.
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DOI：
10.1016/j.dsr2.2016.12.013
发表时间：
2017-08
影响因子：
3
作者：
C. Croguennec;L. Ruffine;B. Dennielou;F. Baudin;J. Caprais;V. Guyader;G. Bayon;C. Brandily;J. L. Bruchec;C. Bollinger;Y. Germain;L. Droz;N. Babonneau;C. Rabouille
通讯作者：
C. Croguennec;L. Ruffine;B. Dennielou;F. Baudin;J. Caprais;V. Guyader;G. Bayon;C. Brandily;J. L. Bruchec;C. Bollinger;Y. Germain;L. Droz;N. Babonneau;C. Rabouille
南海神狐海域声阻抗和电阻率测井天然气水合物饱和度
影响因子：
4.2
作者：
Xiujuan Wang;Shiguo Wu;Myung Lee;Yiqun Guo;Shengxiong Yang;Jinqiang Liang
通讯作者：
Jinqiang Liang
影响因子：
1.8
作者：
W. Shi
通讯作者：
W. Shi
DOI：
10.1002/cjg2.1151
发表时间：
2007-09
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
Song Hai-bin;Wu Shiguo;Jiang Wei-wei
通讯作者：
Song Hai-bin;Wu Shiguo;Jiang Wei-wei
影响因子：
12.1
作者：
R. Hesse
通讯作者：
R. Hesse