DOI: 10.1306/01231211148
Scopus记录号: 2-s2.0-84865356411
论文题名: Lower Triassic oolites of the Nanpanjiang Basin, South China: Facies architecture, giant ooids, and diagenesis-implications for hydrocarbon reservoirs
作者: Lehrmann D.J. ; Minzoni M. ; Li X. ; Yu M. ; Payne J.L. ; Kelley B.M. ; Schaal E.K. ; Enos P.
刊名: AAPG Bulletin
ISSN: 0149-1744
EISSN: 1558-9474
出版年: 2012
发表日期: 2012
卷: 96, 期: 8 起始页码: 1389
结束页码: 1414
语种: 英语
Scopus关键词: Carbonate precipitation
; end-Permian
; Facies architecture
; High energy
; Hydrocarbon reservoir
; Lower triassic
; Middle East
; Neoproterozoic
; Primary mechanism
; Seawater chemistry
; Sichuan
; South China
; Triassic
; Triassic period
; Calcite
; Calcium carbonate
; Hydrocarbons
; Magnesium
; Metals
; Oxygenation
; Seawater
; Sedimentology
; Carbonate minerals
; aragonite
; cross-bedding
; diagenesis
; facies
; grainstone
; hydrocarbon reservoir
; oolite
; Permian
; ripple
; Triassic
; China
; Middle East
; Nanpanjiang Basin
; Sichuan
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Lower Triassic platforms in the Nanpanjiang Basin contain ex11 tensive oolites. Interior oolites are stacked in meter-scale cycles arranged into larger coarsening-upward sequences. Oolites thicken toward margins to include grainstones up to 50 m (164 ft) thick and contain giant ooids (up to 1 cm [0.4 in.]) and composite coated grains. Cross-bedding, ripples, and abraded ooids indicate deposition in high-energy shoals. Apparent layer-cake correlation across interiors indicates amalgamation of shoals. Thinner interior lenses represent spillover lobes. Ooids are interpreted to have originally been bimineralic with cortices of radial or micritic fabrics (high-magnesium calcite), alternating with coarse pseudospar or brickwork (originally aragonite). Distorted ooids formed by brittle compaction of micritic cortices around voids are interpreted to have been dissolved aragonite. Abundant potential nuclei indicate that limited supply was not a factor contributing to the large ooid size. High-energy and abnormally high-seawater CaCO 3 saturation are interpreted to be causes of the giant ooids. Most previous reports of giant ooids come from the Neoproterozoic, a period of increasing surface-water oxygenation and high CaCO 3 saturation caused by a minimal skeletal carbonate precipitation. We interpret similar seawater chemistry in the aftermath of the end-Permian extinction to explain the genesis of the giant ooids in the Early Triassic. The genesis of bimineralic ooids during an Early Triassic period of rapidly increasing pCO 2 and low SO 4 2- indicates that an increasing Ca/Mg ratio was the primary mechanism driving the change from aragonite to calcite seas. The architecture, textures, and diagenesis of the Lower Triassic oolites of the Nanpanjiang Basin provide useful analogs for coeval reservoirs in Sichuan and the Middle East. Copyright © 2012. The American Association of Petroleum Geologists. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84865356411&doi=10.1306%2f01231211148&partnerID=40&md5=29681a59b6490d5e50e70d66acda6b6a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13314
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:
Lehrmann D.J.,Minzoni M.,Li X.,et al. Lower Triassic oolites of the Nanpanjiang Basin, South China: Facies architecture, giant ooids, and diagenesis-implications for hydrocarbon reservoirs[J]. AAPG Bulletin,2012-01-01,96(8)