DOI: 10.1306/02191312162
Scopus记录号: 2-s2.0-84883578969
论文题名: Geothermal convection in South Atlantic subsalt lacustrine carbonates: Developing diagenesis and reservoir quality predictive concepts with reactive transport models
作者: Jones G.D. ; Xiao Y.
刊名: AAPG Bulletin
ISSN: 0149-1663
EISSN: 1558-9393
出版年: 2013
发表日期: 2013
卷: 97, 期: 8 起始页码: 1249
结束页码: 1271
语种: 英语
Scopus关键词: Carbonate reservoir
; Critical functions
; Dissolution rates
; Production scale
; Reactive transport models
; Reservoir permeability
; Reservoir quality
; Retrograde solubility
; Carbonates
; Deposition
; Dissolution
; Forecasting
; Groundwater
; Groundwater flow
; Petroleum reservoir engineering
; Petroleum reservoirs
; Sedimentology
; Subsalt strata
; carbonate
; convection
; data set
; diagenesis
; dissolution
; geothermal energy
; groundwater flow
; lacustrine deposit
; permeability
; reactive transport
; reservoir
; temperature gradient
; African Margin [Indian Ocean]
; Atlantic Ocean
; Atlantic Ocean (South)
; Brazil
; Indian Ocean
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Prolific hydrocarbon discoveries in the subsalt, commonly known as the "presalt," section of Brazil and the conjugate African margin have created a business imperative to predict reservoir quality in lacustrine carbonates. Geothermal convection is a style of groundwater flow known to occur in rift settings, which is capable of diagenetic modification of reservoir quality. We simulated variable density groundwater flow coupled with chemical reactions to evaluate the potential for diagenesis driven by convection in subsalt carbonates. Rates of calcite diagenesis are critically controlled by temperature gradient and fluid flux following the principles of retrograde solubility. Simulations predict that convection could operate in rift carbonates prior to salt deposition, but with rates of dissolution in the reservoir interval only on the order of 0.01 vol. %/m.y., which is too low to significantly modify reservoir quality. The exception is around permeable fault zones and/or unconformities where flow is focused and dissolution rates are amplified to 1 to 10 vol. %/m.y. and could locally modify reservoir quality. After salt deposition, simulations also predict convection with a critical function for salt rugosity. The greatest potential for dissolution at rates of 0.1 to 1 vol. %/m.y. occurs where salt welds, overlying permeable carbonates thin to 500 m (1640 ft) or less. With tens of million years residence times feasible, convection under these conditions could locally result in reservoir sweet spots with porosity modification of 1% to 10% and potentially an order of magnitude or more in reservoir permeability. Integrating quantitative model-derived predictive diagenetic concepts with traditional subsurface data sets refines exploration to production scale risking of carbonate reservoir presence and quality. Copyright © 2013. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883578969&doi=10.1306%2f02191312162&partnerID=40&md5=9ba11115e3920197462ee37478379295
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13233
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:
Jones G.D.,Xiao Y.. Geothermal convection in South Atlantic subsalt lacustrine carbonates: Developing diagenesis and reservoir quality predictive concepts with reactive transport models[J]. AAPG Bulletin,2013-01-01,97(8)