DOI: 10.1306/11021110158
Scopus记录号: 2-s2.0-84862728875
论文题名: Paleohydrogeological and thermal events recorded by fluid inclusions and stable isotopes of diagenetic minerals in Lower Cretaceous sandstones, offshore Nova Scotia, Canada
作者: Karim A. ; Hanley J.J. ; Pe-Piper G. ; Piper D.J.W.
刊名: AAPG Bulletin
ISSN: 0149-1766
EISSN: 1558-9496
出版年: 2012
发表日期: 2012
卷: 96, 期: 6 起始页码: 1147
结束页码: 1169
语种: 英语
Scopus关键词: Apatite fission tracks
; Aqueous inclusions
; Authigenic
; Carbonate cement
; Deep basin
; Diagenetics
; Early Cretaceous
; Event-based
; Fission track
; Fluid inclusion
; Gas reservoir
; Geothermal gradients
; High temperature
; High-salinity fluids
; Highest temperature
; Hydrocarbon migration
; Jurassic
; Late cretaceous
; Liquid hydrocarbons
; Lower Cretaceous
; Mesozoic
; Negative values
; Nova Scotia
; Sandstone samples
; Stable isotopes
; Thermal events
; Thermochronology
; Trapping temperature
; Carbonate minerals
; Carbonation
; Cements
; Hydrocarbons
; Isotopes
; Mineralogy
; Phosphate minerals
; Quartz
; Salinity measurement
; Sodium chloride
; Sandstone
; authigenic mineral
; carbonate group
; Cretaceous
; deformation
; diagenesis
; fluid inclusion
; gas field
; geothermal system
; hydrocarbon entrapment
; hydrocarbon migration
; hydrogeology
; isotopic composition
; limestone
; paleohydrology
; sandstone
; stable isotope
; temperature profile
; thermochronology
; two-dimensional modeling
; volcanism
; Canada
; Nova Scotia
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Upper Jurassic-Lower Cretaceous sandstones of the Scotian Basin, offshore eastern Canada, are important gas reservoirs. Previous studies of fluid inclusions in Jurassic limestones and apatite thermochronology of Cretaceous sandstones have suggested a late Mesozoic thermal event. Fluid inclusions in different authigenic cements were analyzed to determine the temperature and composition of basinal fluid at the time of precipitation and the timing of hydrocarbon migration and entrapment. Fifty-one sandstone samples were analyzed for stable isotope composition (δ18 O and δ13 C) of carbonate cements. Trapping temperatures for primary aqueous inclusions hosted in quartz overgrowths (89-175°C) and in late carbonate cements (138-173°C] are higher than predicted by twodimensional modeling from burial alone based on postrift geothermal gradients. These inclusions contain high-salinity fluids (mostly 19-22 wt. % NaCl equivalent). Second, predominantly aqueous inclusions have much lower salinities (5.2-6.7 wt. % NaCl equivalent), and some contain liquid hydrocarbons. Late Fe-calcite cement in Hauterivian sandstone shows negative values of δ13 CVPDB (-13.17 to -9.2%o), whereas cements in deeper and shallower sandstones have higher S C values. These data indicate that high-temperature, high-salinity fluids preceded hydrocarbon migration. The oldest and youngest rocks studied show less effect of high temperatures than do rocks that were buried to depths of at least 2 km (1.2 mi) after 135 Ma and before 100 Ma. Both fluid inclusions and δ13 C of carbonate cement suggest that highest temperatures were achieved during burial at 115 to 105 Ma. This Early Cretaceous thermal event had a geothermal gradient of at least 55°C/km. It is earlier than the previously reported event based on apatite fission tracks but is consistent with the fission track data. The event is synchronous with regional evidence of volcanism, and its peak coincides with rapid salt-tectonic deformation in the deep basin. Hydrocarbon charge to the outershelf wells occurred after this thermal event and thus not before the Late Cretaceous. Copyright ©2012. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84862728875&doi=10.1306%2f11021110158&partnerID=40&md5=9a911cc547f44b5d0a5026b12e351616
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13336
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:
Karim A.,Hanley J.J.,Pe-Piper G.,et al. Paleohydrogeological and thermal events recorded by fluid inclusions and stable isotopes of diagenetic minerals in Lower Cretaceous sandstones, offshore Nova Scotia, Canada[J]. AAPG Bulletin,2012-01-01,96(6)