Formation of layered fracture and outburst during gas hydrate dissociation

• Published in: Journal of Petroleum Science and Engineering
• Main Authors: 张旭辉, 鲁晓兵, 李清平, Zhang, XH (reprint author), Chinese Acad Sci, Inst Mech, Lab Hydrodynam & Ocean Engn, Beijing 100190, Peoples R China
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2011
• Subjects: Hydrate Dissociation; Excess Pore Pressure; Dissociation Zone; Layered Fracture; Outburst; Methane Hydrate; Slope; Sediments; Norway; Slide; Engineering; Geology; Energy & Fuels; Petroleum; 一类; mud; translation; sedimentary deposits; sedimente; sediments (francais); silts; sediment; sedimentary materials (geological); quaternary sediments; spitsbergen; 平移; 滑塌; Methane hydrate; Spitsbergen
• Online Access: http://dspace.imech.ac.cn/handle/311007/45036; https://doi.org/10.1016/j.petrol.2011.01.013

Hydrate dissociation in marine sediments may cause large hazards. Two types of new hazard phenomena, outburst and layered fracture, are observed in laboratory experiments and the initiation mechanism is discussed. Experiments are carried out in a two-dimensional rectangular box and a one-dimensional cylinder, respectively. It is shown that layered fracture and outburst can appear after hydrate dissociation and are related closely to dissociation speed, permeability, strength of hydrate-bearing sediment and over-layered stratum. Outburst often occurs at low permeability, high strength of over layered stratum and high pore pressure, while layered fracture is just on the contrary. (C) 2011 Elsevier B.V. All rights reserved.