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Alternative TitleGas hydrate occurrence in subsurface near the Dongsha area at northern South China Sea inferred from the pore water geochemistry of shallow sediments
丛晓荣1; 曹运诚2; 苏正1; 陈多福1,2
Source Publication地球化学
Other AbstractGas hydrate is a potential clean energy resource,but no economic and efficient predication method for marine gas hydrate has been set up yet.The pore water geochemistry data of shallow sediments can be used to trace gas hydrate occurrence in subsurface and might provide a low-cost and efficient way for the preliminary stage of marine gas hydrate investigation.The methane flux has reached the sulfate-methane transition zone and possible occurrences of gas hydrates are simulated using the profiles of sulfate,dissolved inorganic carbon,and calcium and magnesium ions in pore water from cored sediments at sites D-5,D-8and D-F in the Dongsha area,northeastern South China Sea in this study.The calculations show that methane fluxes towards the seafloor at D-5,D-8and D-F are11.97?10-3mol/(m2·a),5.98?10-3mol/(m2·a)and26.45?10-3mol/(m2·a),respectively.And only when the geothermal gradients are less than0.058℃/m,0.020℃/m and0.149℃/m for sites D-5,D-8and D-F,the gas hydrate will occur and the top occurring depths of gas hydrate are calculated to be170-197mbsf,378-386mbsf and79-98mbsf,respectively.Our study also shows that the influence of methane flux on the top occurrence of gas hydrate is significant,but the impact of temperature is slight.By considering the depth of bottom simulation reflector occurring on seismic profiles in the study area,the gas hydrate might only occur at sites D-5and D-F.
Keyword孔隙水地球化学 天然气水合物模拟 南海北部 pore water geochemistry gas hydrate simulation northern South China Sea
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Document Type期刊论文
Corresponding Author曹运诚
First Author Affilication天然气水合物
Recommended Citation
GB/T 7714
丛晓荣,曹运诚,苏正,等. 南海北部东沙海域浅层沉积物孔隙水地球化学示踪深部水合物发育特征[J]. 地球化学,2017,46(3):292-300.
APA 丛晓荣,曹运诚,苏正,&陈多福.(2017).南海北部东沙海域浅层沉积物孔隙水地球化学示踪深部水合物发育特征.地球化学,46(3),292-300.
MLA 丛晓荣,et al."南海北部东沙海域浅层沉积物孔隙水地球化学示踪深部水合物发育特征".地球化学 46.3(2017):292-300.
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