Clayey-Silty Sediments Containing Gas Hydrate in South China Sea: Geophysical and Geomechanical Results

DOI

10.2991/978-94-6463-606-2_50How to use a DOI?

Keywords

Gas hydrates; clayey silts; South China Sea; Geophysical properties; Geomechanical properties

Abstract

Huge gas hydrate reserves exist worldwide, and over 90% of them occur in fine-grained reservoirs with poor permeability, such as the hydrate reservoir in the South China Sea (SCS). This type of hydrate reservoir is characterized by non-diagenesis and weak cementation, and hydrate exploitation is prone to trigger reservoir settlement and deformation. Therefore, the key to achieving the safe exploitation of hydrate resources is to conduct in-depth research into the geophysical and geomechanical features of hydrate-bearing sediments (HBSs) in the SCS. Based on this, the geophysical and geomechanical characteristics of the hydrate reservoirs in the Shenhu area of the SCS were thoroughly researched in this work. For the geophysical properties of HBSs, the host sediments of SCS belong to well-graded clayey silts, with particles arranged in a layered configuration face-to-face. Its principal mineral components include quartz, plagioclase, calcite and some clay minerals. For the geomechanical properties of HBSs, the strength, stiffness and volumetric strain of HBSs of SCS increase with effective confining pressure (ECP) under drained conditions. When the pore water is not emptied, the extra pressure is positive, demonstrating substantial shear contraction, and the fitting failure line is unaffected by the ECP. The aforementioned research contents can serve as a guide for future constitutive model and numerical simulation development on hydrate reservoir stability of SCS.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Shi Shen
AU  - Rui Qin
AU  - Haihong Chen
AU  - Ting Huang
AU  - Yang Ge
AU  - Xin Lv
AU  - Huiyong Liang
PY  - 2024
DA  - 2024/12/24
TI  - Clayey-Silty Sediments Containing Gas Hydrate in South China Sea: Geophysical and Geomechanical Results
BT  - Proceedings of the 2024 6th International Conference on Civil Engineering, Environment Resources and Energy Materials (CCESEM 2024)
PB  - Atlantis Press
SP  - 475
EP  - 490
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-606-2_50
DO  - 10.2991/978-94-6463-606-2_50
ID  - Shen2024
ER  -