DOI: 10.1306/12071514127
Scopus记录号: 2-s2.0-84983383070
论文题名: Regional stratigraphy, elemental chemostratigraphy, and organic richness of the NiobraraMember of the Mancos Shale, Piceance Basin, Colorado
作者: El-Attar A. ; Pranter M.J.
刊名: AAPG Bulletin
ISSN: 0149-1437
EISSN: 1558-9167
出版年: 2016
发表日期: 2016
卷: 100, 期: 3 起始页码: 345
结束页码: 377
语种: 英语
Scopus关键词: Calcium
; Carbon
; Deposits
; Fracture mechanics
; Gamma rays
; Geochemistry
; Organic carbon
; Shale
; Calcareous shales
; Chemostratigraphy
; Litho-stratigraphic
; Lithologic interpretation
; Organic richness
; Stratigraphic variabilities
; Total Organic Carbon
; Upper Cretaceous
; Stratigraphy
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: The elemental chemostratigraphy of the Upper Cretaceous Niobrara Member of the Mancos Shale shows that six chemostratigraphic zones can be identified in the Piceance Basin, Colorado, based on geochemical data. Chemostratigraphic correlations of nine wells spaced 20 mi (~32 km) apart closely match lithostratigraphic correlations made using gamma-ray and deepresistivity wireline logs. Lithologic interpretations made from wireline logs indicate that the Niobrara Member and equivalent strata consist primarily of interbedded calcareous shale and shaley limestone facies that increase in thickness to the northwest in the basin. The geochemical data suggest that during deposition of the Niobrara Member, anoxia and calcium enrichment increased to the east of the basin, whereas terrestrial input and clay enrichment increased to the northwest. Element crossplots suggest that a large part of the silicon is detrital and that the Niobrara Member becomes an increasingly more clastic than carbonate system to the west and northwest. The Dlog R-derived total organic carbon (TOC) calculated using a sonic-resistivity overlay analysis technique shows that the Niobrara Member comprises organic-rich and organic-poor deposits. Average TOC values range between 1 wt. % (in organicpoor deposits) and 2.37 wt. % (in organic-rich deposits), with higher TOC values recorded in the southern and eastern parts of the basin. Relative-rock brittleness estimates from element and TOC data show the stratigraphic variability of alternating ductile (TOC rich, Ca and Si/Al poor) and brittle (TOC poor, Ca and Si/Al rich) intervals for the Niobrara Member. Copyright © 2016. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983383070&doi=10.1306%2f12071514127&partnerID=40&md5=0e20e8f10c06d959a3bedd7066a34a42
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13008
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:
El-Attar A.,Pranter M.J.. Regional stratigraphy, elemental chemostratigraphy, and organic richness of the NiobraraMember of the Mancos Shale, Piceance Basin, Colorado[J]. AAPG Bulletin,2016-01-01,100(3)