DOI: 10.1306/07031312117
Scopus记录号: 2-s2.0-84896821258
论文题名: Sequence stratigraphy of the Eocene turbidite reservoirs in Albacora field, Campos Basin, offshore Brazil
作者: De Gasperi A. ; Catuneanu O.
刊名: AAPG Bulletin
ISSN: 0149-1524
EISSN: 1558-9254
出版年: 2014
发表日期: 2014
卷: 98, 期: 2 起始页码: 279
结束页码: 313
语种: 英语
Scopus关键词: Maximum thickness
; Medium-grained sandstones
; Seismic amplitudes
; Sequence stratigraphy
; Terrigenous sediment
; Third-order systems
; Turbidite reservoirs
; Variable thickness
; Deposits
; Petroleum reservoir evaluation
; Shale
; Stratigraphy
; Thickness control
; Turbidity
; Well logging
; Sandstone
; crevasse
; Eocene
; facies
; highstand
; lowstand
; pressure
; sandstone
; sequence stratigraphy
; succession
; transgression
; trough
; turbidite
; turbidity
; Atlantic Ocean
; Brazil
; Campos Basin
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: This article describes a 250-m (820-ft)-thick upper Eocene deep-water elastic succession. This succession is divided into two reservoir zones: the lower sandstone zone (LSZ) and the upper sandstone zone, separated by a package of pelitic rocks with variable thickness on the order of tens of meters. The application of sequence-stratigraphic methodology allowed the subdivision of this stratigraphic section into third-order systems tracts. The LSZ is characterized by blocky and fining-upward beds on well logs, and includes interbedded shale layers of as much as 10 m (33 ft) thick. This zone reaches a maximum thickness of 150 m (492 ft) and fills a trough at least 4 km (2 mi) wide, underlain by an erosional surface. The lower part of this zone consists of coarse- to medium-grained sandstones with good vertical pressure communication. We interpret this unit as vertically and laterally amalgamated channel-fill deposits of high-density turbidity flows accumulated during late forced regression. The sandstones in the upper part of this trough are dominantly medium to fine grained and display an overall fining-upward trend. We interpret them as laterally amalgamated channel-fill deposits of lower density turbidity flows, relative to the ones in the lower part of the LSZ, accumulated during lowstand to early transgression. The pelitic rocks that separate the two sandstone zones display variable thickness, from 35 to more than 100 m (115 >328 ft), indistinct seismic facies, and no internal markers on well logs, and consist of muddy diamictites with contorted shale rip-up clasts. This sectionis interpreted as cohesive debris flows and/or mass-transported slumps accumulated during late transgression. The upper sandstone zone displays a weakly defined blocky well-log signature, where the proportion of sand is higher than 80%, and a jagged well-log signature, where the sand proportion is lower than 60%. The high proportions of sand are associated with a channelized geometry that is well delineated on seismic amplitude maps. Several depositional elements are identified within this zone, including leveed channels, crevasse channels, and splays associated with turbidity flows. This package is interpreted as the product of increased terrigenous sediment supply during highstand normal regression. Copyright ©2014. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896821258&doi=10.1306%2f07031312117&partnerID=40&md5=d7baaa14d8dce3c16fa13ab0f5c381a5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13095
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:
De Gasperi A.,Catuneanu O.. Sequence stratigraphy of the Eocene turbidite reservoirs in Albacora field, Campos Basin, offshore Brazil[J]. AAPG Bulletin,2014-01-01,98(2)