DOI: 10.1306/07271514224
Scopus记录号: 2-s2.0-84961588684
论文题名: Exhumation charge: The last gasp of a petroleum source rock and implications for unconventional shah resources
作者: English J.M. ; English K.L. ; Corcoran D.V. ; Toussaint F.
刊名: AAPG Bulletin
ISSN: 0149-1433
EISSN: 1558-9163
出版年: 2016
发表日期: 2016
卷: 100, 期: 1 起始页码: 1
结束页码: 16
语种: 英语
Scopus关键词: Kerogen
; Oil shale
; Petroleum deposits
; Rocks
; Sedimentology
; Settling tanks
; Shale
; Gas storage capacity
; Organic-rich source rock
; Petroleum exploration
; Petroleum generation
; Petroleum resources
; Pressure reduction
; Reservoir formation
; Volumetric expansion
; Petroleum prospecting
; Bacteria (microorganisms)
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Petroleum (oil and gas) forms from the bacterial or thermal breakdown of kerogen during progressive burial in sedimentary basins. During times of petroleum generation, kerogens in organic-rich source rocks expel petroleum to form a fluid phase in the pore system, capable of migrating under hydrodynamic and buoyancy forces to ultimately escape to the surface or accumulate within petroleum traps in the subsurface. The relative timing of petroleum charge and trap formation is a vital component in the accumulation of petroleum deposits. Exhumed basins have been historically viewed as higher-risk targets for conventional petroleum exploration because of, inter alia, the switch-off of petroleum generation in the source rock at the commencement of cooling during exhumation. However, even at the switch-off point, the source rock may retain a significant volume of petroleum sorbed in kerogen and within its pore system. Herein we demonstrate that if the source rock is exhumed to shallower depths after peak burial, pore pressure reduction and the associated volumetric expansion of the petroleum - particularly of the gaseous - phase in the pore system will result in the discharge of additional petroleum into the adjacent carrier bed or reservoir formations. Because most onshore sedimentary basins are characterized by major exhumation events at some point in their history, this represents an additional and underappreciated mechanism for a late-stage petroleum charge in exhumed sedimentary basins. The modeling also indicates that both the initial, pre-exhumation, total gas storage capacity and the exhumation gas charge are likely to be volumetrically more significant for gas-bearing source rocks that have been exposed to higher initial pressures and lower thermal gradients. The concepts presented here also have implications for petroleum resources retained within unconventional shale reservoirs because high-graded shale plays may be associated with systems where the magnitude or rate of relative overpressure dissipation has limited exhumation charge from the unconventional to conventional reservoirs within the basin. Copyright © 2016. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961588684&doi=10.1306%2f07271514224&partnerID=40&md5=69328632bf69c3e923f0580f4e4e4edc
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13004
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:
English J.M.,English K.L.,Corcoran D.V.,et al. Exhumation charge: The last gasp of a petroleum source rock and implications for unconventional shah resources[J]. AAPG Bulletin,2016-01-01,100(1)