Coupled carbon and sulfur isotope behaviors and other geochemical perspectives into marine methane seepage

LIU Lihua; FU Shaoying; ZHANG Mei; GUAN Hongxiang; WU Nengyou

doi:10.1007/s13131-017-0998-y

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Article Navigation > Acta Oceanologica Sinica > 2017 > 36(6): 12-22

LIU Lihua, FU Shaoying, ZHANG Mei, GUAN Hongxiang, WU Nengyou. Coupled carbon and sulfur isotope behaviors and other geochemical perspectives into marine methane seepage[J]. Acta Oceanologica Sinica, 2017, 36(6): 12-22. doi: 10.1007/s13131-017-0998-y

Citation:

LIU Lihua, FU Shaoying, ZHANG Mei, GUAN Hongxiang, WU Nengyou. Coupled carbon and sulfur isotope behaviors and other geochemical perspectives into marine methane seepage[J]. Acta Oceanologica Sinica, 2017, 36(6): 12-22. doi: 10.1007/s13131-017-0998-y

Citation:

LIU Lihua, FU Shaoying, ZHANG Mei, GUAN Hongxiang, WU Nengyou. Coupled carbon and sulfur isotope behaviors and other geochemical perspectives into marine methane seepage[J]. Acta Oceanologica Sinica, 2017, 36(6): 12-22. doi: 10.1007/s13131-017-0998-y

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Coupled carbon and sulfur isotope behaviors and other geochemical perspectives into marine methane seepage

doi: 10.1007/s13131-017-0998-y

1.
Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Guangzhou Marine Geological Survey, Guangzhou 510760, China
3.
The Key Laboratory of Gas Hydrate of Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

Received Date: 2016-04-12
Rev Recd Date: 2016-09-27

Abstract

Abstract

Methane seepage is the signal of the deep hydrocarbon reservoir. The determination of seepage is significant to the exploration of petroleum, gas and gas hydrate. The seepage habits microbial and macrofaunal life which is fueled by the hydrocarbons, the metabolic byproducts facilitate the precipitation of authigenic minerals. The study of methane seepage is also important to understand the oceanographic condition and local ecosystem. The seepage could be active or quiescent at different times. The geophysical surveys and the geochemical determinations reveal the existence of seepage. Among these methods, only geochemical determination could expose message of the dormant seepages. The active seepage demonstrates high porewater methane concentration with rapid SO₄^2- depleted, low H₂S and dissolved inorganic carbon (DIC), higher rates of sulfate reduction (SR) and anaerobic oxidation of methane (AOM). The quiescent seepage typically develops authigenic carbonates with specific biomarkers, with extremely depleted ¹³C in gas, DIC and carbonates and with enriched ³⁴S sulfate and depleted ³⁴S pyrite. The origin of methane, minerals precipitation, the scenario of seepage and the possible method of immigration could be determined by the integration of solutes concentration, mineral composition and isotopic fractionation of carbon, sulfur. Numerical models with the integrated results provide useful insight into the nature and intensity of methane seepage occurring in the sediment and paleo-oceanographic conditions. Unfortunately, the intensive investigation of a specific area with dormant seep is still limit. Most seepage and modeling studies are site-specific and little attempt has been made to extrapolate the results to larger scales. Further research is thus needed to foster our understanding of the methane seepage.
- marine seepage,
- authigenic minerals,
- carbon isotopes,
- sulfur isotopes,
- numerical simulation

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References(103)

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