INFLUENCE FACTORS AND RISK ASSESSMENT FOR SEABED LANDSLIDES INDUCED BY NATURAL GAS HYDRATE DECOMPOSITION

TANG Changrui; XU Xiugang; SUN Bingcai; JIANG Ruijing

doi:10.16028/j.1009-2722.2021.021

2021 Vol. 37, No. 5

Article Contents

Article navigation > Marine Geology Frontiers > 2021 > 37(5): 14-21

Next Article Previous Article

TANG Changrui, XU Xiugang, SUN Bingcai, JIANG Ruijing. INFLUENCE FACTORS AND RISK ASSESSMENT FOR SEABED LANDSLIDES INDUCED BY NATURAL GAS HYDRATE DECOMPOSITION[J]. Marine Geology Frontiers, 2021, 37(5): 14-21. doi: 10.16028/j.1009-2722.2021.021

Citation:

TANG Changrui, XU Xiugang, SUN Bingcai, JIANG Ruijing. INFLUENCE FACTORS AND RISK ASSESSMENT FOR SEABED LANDSLIDES INDUCED BY NATURAL GAS HYDRATE DECOMPOSITION[J]. Marine Geology Frontiers, 2021, 37(5): 14-21. doi: 10.16028/j.1009-2722.2021.021

INFLUENCE FACTORS AND RISK ASSESSMENT FOR SEABED LANDSLIDES INDUCED BY NATURAL GAS HYDRATE DECOMPOSITION

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China
3.
China Petroleum Group Safety and Environmental Protection Technology Research Institute Co. Ltd., Beijing 102206, China

More Information

Corresponding author: XU Xiugang, xxg@ouc.edu.cn

Received Date: 02 January 2021

Publish Date: 20 May 2021

Abstract

Abstract

Natural gas hydrate mainly occurs in the seabed sediments under low temperature and high pressure. When temperature or pressure changes, the stability of gas hydrate will be damaged, and geological disasters, such as submarine landslide and sediment collapse triggered, which will cause severe damage to offshore platforms and submarine cables. In this paper, based on the seismic data acquired from the submarine continental slope in northern South China Sea, actual reservoir property parameters and corresponding mechanical model parameters are acquired with the improved geomechanical model. Effective formation stress is calculated with the equilibrium equation of pore pressure. Upon the basis, the numerical simulation of submarine landslide induced by the decomposition of natural gas hydrate is made. Then, using the strength reduction method, the mechanical response of hydrate reservoir change caused by initial hydrate decomposition amount and total hydrate decomposition amount is calculated. Upon the correspondent safety factor distribution diagrams, we made a preliminary analysis of undersea landslide caused by hydrate decomposition. The results provide a guidance for prevention of primary or secondary environmental geohazards in the future exploitation of gas hydrate.
- natural gas hydrate /
- geophysical parameter /
- submarine landslide /
- numerical simulation /
- northern South China Sea

FullText(HTML)

References

[1]	LI S,XU X,ZHENG R,et al. Experimental investigation on dissociation driving force of methane hydrate in porous media[J]. Fuel,2015,160(15):117-122. Google Scholar
[2]	GUPTA S,DEUSNER C,HAECKEL M,et al. Testing a thermo-chemo-hydro-geomechanical model for gas hydrate-bearing sediments using triaxial compression laboratory experiments[J]. Geochemistry Geophysics Geosystems,2017,18(9):3419-3437. doi: 10.1002/2017GC006901 CrossRef Google Scholar
[3]	SULTAN N,COCHONAT P,FOUCHER J P,et al. Effect of gas hydrates melting on seafloor slope instability[J]. Marine Geology,2004,213(1/4):379-401. Google Scholar
[4]	杨晓云. 天然气水合物与海底滑坡研究[D]. 青岛: 中国石油大学(华东), 2010. Google Scholar
[5]	刘锋. 南海北部陆坡水合物分解引起海底不稳定性的定量分析[D]. 青岛: 中国石油大学(华东), 2010. Google Scholar
[6]	周丹. 天然气水合物分解对海底结构物稳定性影响的研究[D]. 大连: 大连理工大学, 2012. Google Scholar
[7]	马云. 南海北部陆坡区海底滑坡特征及触发机制研究[D]. 青岛: 中国海洋大学, 2014. Google Scholar
[8]	GUPTA S,WOHLMUTH B,HELMIG R. Multi-rate time stepping schemes for hydro-geomechanical model for subsurface methane hydrate reservoirs[J]. Advances in Water Resources,2015,91:78-87. Google Scholar
[9]	LU L,Zhang X H,LU X B. Numerical study on the stratum's responses due to natural gas hydrate dissociation[J]. Ships and Offshore Structures,2017,12(6):775-780. doi: 10.1080/17445302.2016.1241366 CrossRef Google Scholar
[10]	刘洋. 利用地震资料估算孔隙度和饱和度的一种新方法[J]. 石油学报,2005(2):61-64. doi: 10.3321/j.issn:0253-2697.2005.02.013 CrossRef Google Scholar
[11]	GROZIC J L H, KVALSTAD T J. Effect of gas on deepwater marine sediments[C]//Proceedings of XVth International Conference on Soil Mechanic and Geotechnical Engineering, Istanbul, 2001:27-31. Google Scholar
[12]	NIXON M F. Influence of gas hydrates on submarine slope stability[M].Department of Civil Engineering, University of Calagary, Alberta, 2005. Google Scholar
[13]	格劳尔等. 地震岩性学[M]. 北京: 石油工业出版社, 1987. Google Scholar
[14]	WROTH C P. Correlations of some engineering properties of soil[C]//Acta Informatica: Proceedings of the International Conference on the Behaviour of Offshore Structures. London, 1979:28-31. Google Scholar
[15]	张旭辉,王淑云,李清平,等. 天然气水合物沉积物力学性质的试验研究[J]. 岩土力学,2010,31(10):3069-3074. doi: 10.3969/j.issn.1000-7598.2010.10.007 CrossRef Google Scholar
[16]	石要红,张旭辉,鲁晓兵,等. 南海水合物黏土沉积物力学特性试验模拟研究[J]. 力学学报,2015,47(3):521-528. Google Scholar