DOI: 10.1306/08031515068
Scopus记录号: 2-s2.0-84961575933
论文题名: Chemometric recognition of genetically distinct oil families in the Los Angeles basin, California
作者: Peters K.E. ; Wright T.L. ; Ramos L.S. ; Zumberge J.E. ; Magoon L.B.
刊名: AAPG Bulletin
ISSN: 0149-1436
EISSN: 1558-9166
出版年: 2016
发表日期: 2016
卷: 100, 期: 1 起始页码: 115
结束页码: 135
语种: 英语
Scopus关键词: Aromatic hydrocarbons
; Biomarkers
; Clay minerals
; Decision trees
; Fertilizers
; Geochemistry
; Isotopes
; Multivariant analysis
; Oil shale
; Petroleum prospecting
; Redox reactions
; Rocks
; Shale
; Stratigraphy
; Sulfur
; Depositional environment
; Genetic classification
; Genetic relationships
; High sulfur contents
; Multivariate statistics
; Petroleum accumulations
; Source rock extracts
; Stable carbon isotope ratio
; Shale oil
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: The prolific Los Angeles basin in California may be the most petroliferous province on Earth per volume of sedimentary fill. However, because most exploration in the basin occurred prior to the advent of modern geochemical methods, genetic relationships among the various petroleum accumulations and their source rocks have remained speculative. A training set of 24 source-related biomarker and stable carbon isotope ratios for 111 non- or mildly biodegraded oil samples from the basin was used to construct a chemometric (multivariate statistics] decision tree. The decision tree allows genetic classification of additional oil or source-rock extract samples that might be collected. The decision tree identifies 6 tribes and a total of 12 genetically distinct oil families. The families have different bulk properties, such as API gravity and sulfur content, which were previously explained as resulting from secondary processes, including thermal maturity or biodégradation. However, the chemometric assignments are based on genetic properties that reflect distinct organofacies. The oil families occur in different locations and reservoir intervals in the basin, consistent with their origins from different organofacies of active source rock. The source-rock depositional environment for each oil family can be inferred using biomarker and isotope ratios. The samples show stable carbon isotope ratios for saturate and aromatic hydrocarbons that indicate different organofacies of Miocene marine source rocks. Tribes 1 and 2 straddle the central trough, mainly occur east of the Newport-Inglewood fault zone (NIFZ), and show evidence of proximal, clay-rich source rock deposited under suboxic conditions with elevated angiosperm input. Tribes 3-6 occur west of the NIFZ and show evidence of more distal, clay-poor source rock deposited under anoxic conditions. Geochemistry and stratigraphy of the oil tribes (1-6 below) suggest the following source-rock organofacies: 1. Suboxic upper Miocene (Delmontian) proximal clay-rich shale generated low-sulfur tribe 1 and 2 oil types (-0.55-1.06 wt. %) east of the NIFZ that show higher thermal maturity than tribes 3-6. The source rock for tribe 1 was slightly more reducing (lower redox potential or Eh] than that for tribe 2. 2. Low-sulfur tribe 2 oil (-0.20-0.23 wt. %) is significantly more mature, and the source rock is more clay rich and received more angiosperm input than tribe 1. 3. Anoxic upper Miocene (middle-upper Puente) distal shale source rock generated sulfur-rich tribe 3 oil (-1.42-1.58 wt. %) west of the NIFZ. The source rock received less higher-plant input than the source rocks for tribes 1 and 2. 4. Suboxic-anoxic Mohnian(?) clay-poor shale or marl source rock generated tribe 4 oil west of the NIFZ. One oil family in tribe 4 has low sulfur, whereas the other has high sulfur content. Higher-plant input is comparable to tribe 3. 5. Anoxic middle-upper Miocene (Lower Puente "nodular shale") distal shale generated sulfur-rich (-1.24 wt. %) tribe 5 oil to the southwest of the NIFZ. 6. Anoxic middle-upper Miocene (Lower Modelo nodular shale equivalent) distal shale or marl generated high-sulfur tribe 6 oil (-2.42 wt. %) to the northwest of the NIFZ at lower levels of thermal maturity than the other tribes. Copyright © 2016. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961575933&doi=10.1306%2f08031515068&partnerID=40&md5=c6d6013a9baa25c3b8113e2dd09b1925
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13007
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:
Peters K.E.,Wright T.L.,Ramos L.S.,et al. Chemometric recognition of genetically distinct oil families in the Los Angeles basin, California[J]. AAPG Bulletin,2016-01-01,100(1)