DOI: 10.1306/06171413126
Scopus记录号: 2-s2.0-84919360852
论文题名: Failure of cap-rock seals as determined from mechanical stratigraphy, stress history, and tensile-failure analysis of exhumed analogs
作者: Petrie E.S. ; Evans J.P. ; Bauer S.J.
刊名: AAPG Bulletin
ISSN: 0149-1560
EISSN: 1558-9290
出版年: 2014
发表日期: 2014
卷: 98, 期: 11 起始页码: 2365
结束页码: 2390
语种: 英语
Scopus关键词: Failure analysis
; Flow of fluids
; Fracture testing
; Geochronology
; Lithology
; Low permeability reservoirs
; Mechanical properties
; Metamorphic rocks
; Petroleum reservoir engineering
; Rock mechanics
; Rocks
; Stratigraphy
; Stresses
; Tensile strength
; Calcareous shales
; Differential stress
; Fluid-flow pathways
; Hydrocarbon production
; Mechanical properties controls
; Mechanical stratigraphy
; Sandstone reservoirs
; Unconventional reservoirs
; Fracture
; burial (geology)
; calcareous soil
; cap rock
; exhumation
; failure analysis
; fluid flow
; fracture network
; lithostratigraphy
; Mesozoic
; outcrop
; Paleozoic
; sealing
; stress analysis
; tensile stress
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: The sedimentologic and tectonic histories of clastic cap rocks and their inherent mechanical properties control the nature of permeable fractures within them. The migration of fluid through mm- to cm-scale fracture networks can result in focused fluid flow allowing hydrocarbon production from unconventional reservoirs or compromising the seal integrity of fluid traps. To understand the nature and distribution of subsurface fluid-flow pathways through fracture networks in cap-rock seals we examine four exhumed Paleozoic and Mesozoic seal analogs in Utah. We combine these outcrop analyses with subsidence analysis, paleoloading histories, and rock-strength testing data in modified Mohr-Coulomb-Griffith analyses to evaluate the effects of differential stress and rock type on fracture mode. Relative to the underlying sandstone reservoirs, all four seal types are low-permeability, heterolithic sequences that show mineralized hydraulic-extension fractures, extensional-shear fractures, and shear fractures. Burial-history models suggest that the cap-rock seal analogs reached a maximum burial depth >4 km (2.5 mi) and experienced a lithostatic load of up to 110 MPa (15,954 psi). Median tensile strength from indirect mechanical tests ranges from 2.3 MPa (334 psi) in siltstone to 11.5 MPa (1668 psi) in calcareous shale. Analysis of the pore-fluid factor (λv = Pf/σv) through time shows changes in the expected failure mode (extensional shear or hydraulic extension), and that failure mode depends on a combination of mechanical rock properties and differential stress. As expected with increasing lithostatic load, the amount of overpressure that is required to induce failure increases but is also lithology dependent. Copyright © 2014. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84919360852&doi=10.1306%2f06171413126&partnerID=40&md5=152044811d6097865b1a2b34264549a3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13131
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:
Petrie E.S.,Evans J.P.,Bauer S.J.. Failure of cap-rock seals as determined from mechanical stratigraphy, stress history, and tensile-failure analysis of exhumed analogs[J]. AAPG Bulletin,2014-01-01,98(11)