DOI: 10.1016/j.tecto.2020.228351
论文题名: Mechanical control on patterns of overburden deformation induced by dyke-fed sandstone intrusions: Insights from numerical experiments
作者: Meng Q. ; Hodgetts D.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 777 语种: 英语
中文关键词: Conical
; Differential compaction
; Forced fold
; Fracture
; Sandstone intrusion
英文关键词: Compaction
; Deformation
; Fracture
; Mechanical properties
; Numerical methods
; Numerical models
; Sandstone
; Conical
; Deformation pattern
; Differential compaction
; Forced fold
; Hydrocarbon reservoir
; Numerical experiments
; Opening mode fracture
; Sandstone intrusions
; Sediments
; compaction
; deformation
; discrete element method
; fold
; fracture zone
; igneous intrusion
; induced response
; numerical method
; overburden
; sandstone
; tensile stress
英文摘要: Conical sandstone intrusions, as a distinct type of hydrocarbon reservoir, remain poorly understood regarding their emplacement mechanics. Here, we report a numerical modelling study of conical sandstone intrusions using the two-dimensional discrete element method. We built numerical models that contain bonded elastic particles with predefined mechanical properties in an open box as the overburden. A thin tube filled with unbonded particles, and connected to the upper box, was used to model the feeder dyke. The dynamic behavior of the assembly was enabled by the displacement of a driving wall that defines the lower boundary of the feeder dyke. The results show that the model composed of soft materials produced a pair of conical, opening-mode fractures in the host sediments as the result of tensile stress concentrations in the fracture tip zones. The overburden deformation was largely localised within the sediments adjacent to the sandbody, and without the formation of a forced fold and significant uplift of the surface. In contrast, the model composed of stiffer materials produced conical fractures that have closed lower segments and opening upper segments with a reverse sense of shear. The intrusion also caused a forced fold in the overburden, with a vertical opening-mode fracture generated in the fold hinge. The modelling results demonstrate that dyke-fed sand intrusions can significantly distort the local stress field and the overburden can be subjected to fracturing and/or folding due to differential compaction during gradual inflation of the intrusive sandbody. Importantly, deformation patterns of the overburden in response to sandstone intrusion largely depend on mechanical properties of the host sediments. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170662
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, United Kingdom
Recommended Citation:
Meng Q.,Hodgetts D.. Mechanical control on patterns of overburden deformation induced by dyke-fed sandstone intrusions: Insights from numerical experiments[J]. Tectonophysics,2020-01-01,777