气候变化领域集成服务门户(CCPortal): Geochemically distinct oil families in the onshore and offshore Santa Maria basins, California

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DOI	10.1306/07111818014
	Geochemically distinct oil families in the onshore and offshore Santa Maria basins, California
	Peters K.E.; Lillis P.G.; Lorenson T.D.; Zumberge J.E.
发表日期	2019
ISSN	0149-1423
EISSN	1558-9153
卷号	103 期号:2 页码:243-271
英文摘要	The purpose of this work is to identify genetic affinities among 48 crude oil samples from the onshore and offshore Santa Maria basins. A total of 21 source-related biomarker and stable carbon isotope ratios among the samples were assessed to assure that they were unaffected by secondary processes. Chemometric analysis of these data identifies six oil families with map and stratigraphic distributions that reflect organofacies variations within the Miocene Monterey Formation source rock. The data comprise a training set that was used to create a chemometric decision tree to classify newly collected oil samples. Three onshore families originated from two synclines, which may contain one or more pods of thermally mature source rock. Multiple biomarker parameters indicate that the six oil families achieved early oil window maturity in the range of 0.6%-0.7% equivalent vitrinite reflectance. The offshore oil samples consist of one family from Point Pedernales field and two families from the "B" prospect. Geochemical characteristics of these families indicate origins under differing water column and sediment oxicity and carbonate versus siliceous and detrital input in 'carbonate,' 'marl,' and 'shale' organofacies like those in the lower calcareous-siliceous, carbonaceous marl, and clayey-siliceous members of the Monterey Formation elsewhere in coastal California. The corresponding lithofacies and organofacies appear to be linked to the early- middle Miocene climate optimum and subsequent paleoclimatic cooling after circa 14Ma, a systematic up-section increase in the stable carbon isotope composition of related oil samples, decreased preservation of calcium carbonate shells from planktic foraminifera and coccoliths, and increased preservation of claysized siliceous shells of diatoms and radiolarians. The results show that organofacies within theMonterey source rock are responsiblefor many of the geochemical differences between the oil families. This paleoclimate-organofacies model for crude oil from the Monterey Formation can be used to enhance future exploration efforts in many areas of coastal California. © 2019. The American Association of Petroleum Geologists.
语种	英语
WOS研究方向	Geology
scopus关键词	Biomarkers; Calcium carbonate; Carbon; Carbonaceous shale; Carbonation; Classification (of information); Crude oil; Decision trees; Fertilizers; Geochemistry; Isotopes; Offshore oil fields; Offshore oil well production; Stratigraphy; Trees (mathematics); Chemometric analysis; Exploration effort; Geochemical characteristic; Multiple biomarkers; Planktic foraminifera; Stable carbon isotope compositions; Stable carbon isotope ratio; Vitrinite reflectance; Offshore petroleum prospecting; biomarker; calcium carbonate; carbon isotope; coccolith; cooling; crude oil; diatom; geochemistry; hydrocarbon exploration; lithofacies; Miocene; paleoclimate; planktonic foraminifera; radiolaria; source rock; water column; California; Dominican Republic; Hispaniola; Monterey; Pedernales; Santa Maria [California]; United States; Bacillariophyta; Foraminifera; Haptophyceae; Radiolaria (protozoans)
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/92824
作者单位	Schlumberger, Mill Valley, CA, United States; Geological Sciences Department, Stanford University, Stanford, CA, United States; Emeritus, US Geological Survey, Denver, CO, United States; US Geological Survey, Santa Cruz, CA, United States; GeoMark Research, Ltd., Houston, TX, United States
推荐引用方式 GB/T 7714	Peters K.E.,Lillis P.G.,Lorenson T.D.,et al. Geochemically distinct oil families in the onshore and offshore Santa Maria basins, California[J],2019,103(2):243-271.
APA	Peters K.E.,Lillis P.G.,Lorenson T.D.,&Zumberge J.E..(2019).Geochemically distinct oil families in the onshore and offshore Santa Maria basins, California.AAPG Bulletin,103(2),243-271.
MLA	Peters K.E.,et al."Geochemically distinct oil families in the onshore and offshore Santa Maria basins, California".AAPG Bulletin 103.2(2019):243-271.