The research on the possibilities of detecting gas hydrates by the world community in the 20^th – 21^st centuries

The relevance of gas hydrates studying is defined to their potential role as an alternative energy source and an important element in the research of climate change. The main purpose of this literature review is to systematize existing methods for detecting gas hydrates, as well as to analyze their effectiveness and applicability in various conditions. The research objectives include the assessment of modern technologies such as seismic sensing, geophysical methods, chemical analysis of samples, the use of remote sensing data, and various modeling options. A number of publications based on such databases as GoogleScholar, GeoRef, and ResearchGate on methods for detecting gas hydrates, with an emphasis on their technological aspects and practical applications were found. The used methods include comparative analysis, meta-analysis of data, and evaluation of field research results. As a result, it was revealed that the most effective methods are represented by combinations of geophysical methods that allow to increase the accuracy of localization gas hydrates localization. Moreover, remote sensing methods are becoming more popular as an effective tool for identifying sources of methane emissions, usually associated with hydrate deposits. The main findings show that despite the advances in gas hydrate detection, there is a need in developing more sensitive and cost-effective technologies. The prospects for further research include the integration of new sensor technologies and modelling to improve the accuracy of predictions of gas hydrate deposits. The areas of future researches may cover both theoretical aspects and practical implementation of new methods in the field.

1. Liu L, Ryu B, Sun Zh et al. Monitoring and research on environmental impacts related to marine natural gas hydrates: Review and future perspective. Elsevier. Journal of Natural Gas Science and Engineering. 2019;65:82-107. Available from: https://www.sciencedirect.com/science/article/abs/pii/S1875510019300459;

2. Collett TS, Lee MW, Agena WF et al, Permafrost-associated natural gas hydrate occurrences on the Alaska North Slope. Elsevier. Marine and Petroleum Geology. 2011;8:279-294. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0264817209002177;

3. Uchida T, Dallimore S, Mikami J. Occurrences of Natural Gas Hydrates beneath the Permafrost Zone in Mackenzie Delta. Annals New York Academy of Science. 2006:1021-1033. Available from: https://nyaspubs.onlinelibrary.wiley.com/doi/abs/10.1111/j.1749-6632.2000.tb06857.x;

4. Weitemeyer KA, Constable S. A marine electromagnetic survey to detect gas hydrate at Hydrate Ridge, Oregon. Geophysical Journal International. 2011; 187: 45-62. Available from: https://academic.oup.com/gji/article/187/1/45/563620;

5. Klapp StA, Murshed MM, Pape Th et al. Mixed gas hydrate structures at the Chapopote Knoll, southern Gulf of Mexico. Elsevier. Earth and Planetary Science Letters. 2010;299:207-217. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0012821X10005625;

6. Horozal S, Bahk J-J, Urgeles R et al. Mapping gas hydrate and fluid flow indicators and modeling gas hydrate stability zone (GHSZ) in the Ulleung Basin, East (Japan) Sea: Potential linkage between the occurrence of mass failures and gas hydrate dissociation. Elsevier. Marine and Petroleum Geology. 2018;80:171-191. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0264817216304305;

7. GuoK, Fan Sh, Wang Y et al. Physical and chemical characteristics analysis of hydrate samples from northern South China sea. Elsevier. Journal of Natural Gas Science and Engineering. 2020;1-10. Available from: https://www.sciencedirect.com/science/article/abs/pii/S1875510020303309;

8. Wei J, Fang Y, Lu H et al. Distribution and characteristics of natural gas hydrates in the Shenhu Sea Area, South China Sea. Elsevier. Marine and Petroleum Geology. 2018;98:622-628. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0264817218303064;

9. Jinxing D, Yunyan N, Shipeng H et al. Genetic types of gas hydrates in China. Online English edition of the Chinese language journal. Petroleum exploration and Development. 2017;44(6):887-898. Available from: https://www.sciencedirect.com/science/article/pii/S1876380417301015;

10. Schwalenberg K, Haeckel M, Poort J et al. Evaluation of gas hydrate deposits in an active seep area using marine controlled source electromagnetics: Results from Opouawe Bank, Hikurangi Margin, New Zealand. Elsevier. Marine Geology. 2010;272:79-88. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0025322709001819;

11. Attias E, Weitemeyer K, Holz S et al. High-resolution resistivity imaging of marine gas hydrate structures by combined inversion of CSEM towed and oceanbottom receiver data. Geophysical Journal International. 2018; 133. Available from: https://academic.oup.com/gji/article/214/3/1701/5034952;

12. Vanneste M, Batist M De, Golmshtok A et al. Multi-frequency seismic study of gas hydrate-bearing sediments in Lake Baikal, Siberia. Elsevier. International Journal of Marine Geology, Geochemistry and geophysics. 2001;172:1-21. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0025322700001171

13. Vanneste M, Poort J, Batist MDe et al. Atypical heat-flow near gas hydrate irregularities and cold seeps in the Baikal Rift Zone. Elsevier. Marine and Petroleum Geology. 2003;19:1257-1274. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0264817203000199

14. Khlystov OM, Poort J, Mazzini A et al. Shallow-rooted mud volcanism in Lake Baikal. Elsevier. Marine and Petroleum Geology. 2019;102:580-589. Available from: https://www.sciencedirect.com/science/article/abs/pii/S0264817219300054

15. Khlystov OM. The results of the search and study of Baikal gas hydrates. 2017; (in Russia)

16. Leon R, Somoza L, Gimenez-Moreno CJ et al. A predictive numerical model for potential mapping of the gas hydrate stability zone in the Gulf of Cadiz. Elsevier. Marine and Petroleum Geology. 2009;26:1564-1579. Available from: https://www.sciencedirect.com/science/article/abs/pii/S026481720900021X

17. Kret K, Tsuji T, Chhun Ch et al. Distributions of gas hydrate and free gas accumulations associated with upward fluid flow in the Sanriku-Oki forearc basin, northeast Japan. Elsevier. Marine and Petroleum Geology. 2020;116:1-15. Available from: https://www.sciencedirect.com/science/article/abs/pii/S026481722030088X

18. Gerivani H, Gerivani B et al. Potential map of gas hydrate formation in Caspian Sea based on physicochemical stability evaluation of methane hydrate. Marine Georesources & Geotechnology. 2017;35(1):136-142. Available from: https://www.tandfonline.com/doi/abs/10.1080/1064119X.2015.1118581

19. Engram M, Anthony KW, Meyer FJ et al, Synthetic aperture radar (SAR) backscatter response from methane ebullition bubbles trapped by thermokarst lake ice. Canadian Journal of Remote Sensing. 2012;38(6):667-682. Available from: M. Engram, K. W. Anthony, F. J. Meyer et al, Synthetic aperture radar (SAR) backscatter response from methane ebullition bubbles trapped by thermokarst lake ice

20. Lindgren PR, Grosse G, Walter Anthony KM et al. Detection and spatiotemporal analysis of methane ebullition on thermokarst lake ice using highresolution optical aerial imagery. Biogeosciences. 2016; 3: 27-44. Available from: https://bg.copernicus.org/articles/13/27/2016/