DOI: 10.1306/04111U0143
Scopus记录号: 2-s2.0-84857322937
论文题名: Geomechanical modeling of stresses adjacent to salt bodies: Part 2 - Poroelastoplasticity and coupled overpressures
作者: Nikolinakou M.A. ; Luo G. ; Hudec M.R. ; Flemings P.B.
刊名: AAPG Bulletin
ISSN: 0149-1802
EISSN: 1558-9532
出版年: 2012
发表日期: 2012
卷: 96, 期: 1 起始页码: 65
结束页码: 85
语种: 英语
Scopus关键词: Fully-coupled
; Geologic settings
; Geomechanical model
; Geomechanical modeling
; Insitu stress
; Over-pressures
; Poroelastic
; Pressure field
; Principal stress
; Stress perturbations
; Undrained
; Undrained analysis
; Anoxic sediments
; Geologic models
; Loading
; Sedimentology
; Pore pressure
; Coulomb criterion
; deformation
; dissipation
; elastoplasticity
; geomechanics
; hydrostatic pressure
; mudstone
; numerical model
; overpressure
; pore pressure
; sediment yield
; sphere
; tectonic setting
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: We use a fully coupled poroelastoplastic geomechanical model to study how stresses and pore pressures evolve in sediments bounding a spherical salt body. Drained analyses (pore pressures remain hydrostatic) demonstrate that sediments yield in response to loading by the salt, which leads to a redistribution of stresses and to deformations larger than predicted by poroelastic or solid Coulomb-plastic models. Undrained analyses (overpressures develop while no dissipation occurs) illustrate that salt loading induces pore pressures that extend kilometers away from the salt body. We also model the flow and consequent dissipation that occur in the sediments because of this undrained salt loading. We show that with time, the pressure field dissipates and expands. The dissipation process takes millions of years, which suggests that pore-pressure perturbations caused by salt loading should still be present in mudstones near many salt bodies. Under drained conditions, stress perturbations generate low minimum principal stresses above and below the salt, resulting in convergence of pore pressure and minimum principal stress at these locations. Such conditions are challenging to drill through. In undrained systems, sharp drops in pore pressure may occur above and below the salt, whereas both the pore pressure and the minimum principal stress rise next to the salt. In contrast to previous models that do not couple changes in stress to changes in pore pressure, the coupled approach presented here has the potential to predict in-situ stresses and pore pressures more accurately in a wide variety of geologic settings. Copyright ©; 2012. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84857322937&doi=10.1306%2f04111U0143&partnerID=40&md5=b87b303c3331e4fe10140466ef92101d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13372
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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Recommended Citation:
Nikolinakou M.A.,Luo G.,Hudec M.R.,et al. Geomechanical modeling of stresses adjacent to salt bodies: Part 2 - Poroelastoplasticity and coupled overpressures[J]. AAPG Bulletin,2012-01-01,96(1)