气候变化领域集成服务门户(CCPortal): Factors controlling source and reservoir characteristics in the Niobrara shale oil system; Denver Basin

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DOI	10.1306/0121191619717287
	Factors controlling source and reservoir characteristics in the Niobrara shale oil system; Denver Basin
	Han Y.; Horsfield B.; Mahlstedt N.; Wirth R.; Curry D.J.; LaReau H.
发表日期	2019
ISSN	0149-1423
起始页码	2045
结束页码	2072
卷号	103 期号:9
英文摘要	This paper clarifies the controls of oil retention in the Niobrara Formation, Denver Basin, in the western United States. Sweet spots have been recognized using a total of 98 core samples from 5 wells with maturities covering the oil window. Oil retention in the source rock samples (carbonate content <70 wt. %) is controlled by organic matter richness and thermal maturity. In general, the vaporizable hydrocarbon (HC) yield at nominal temperatures at 300°C ([S1]; Rock-Eval) is positively correlated to total organic carbon (TOC). With increasing maturity, the so-called oil saturation index (S1/TOC · 100) first increases until a maximum retention capacity (100 mg HC/g TOC) is exceeded at the temperature at the maximum rate of petroleum generation by Rock-Eval pyrolysis (Tmax) of approximately 445°C and subsequently decreases. The depletion in oil retention capacity is believed to be associated with the appearance of organic nanopores. Oil retention in samples with distinct reservoir potential (carbonate >30 wt. %) is controlled by carbonate content, which is positively related to the amount of retained oil. Petrographic features indicate that oil or bitumen is stored in porous calcite fossils (i.e., coccolith and foraminifera), which provide additional space for petroleum storage. Chalk samples (carbonate >85 wt. %) are characterized by anomalously low Tmax values caused by the influence of heavy petroleum or bitumen. The amount of this bitumen is higher than the initial petroleum potential of kerogen in A and B chalks and thus must have been emplaced here. The most likely sources are juxtaposed organic-rich marl layers. Thus, sweet spots occur where carbonate content is either low (high TOC) or high (low TOC), whereas production of petroleum from the pore space of presumably brittle chalk seems more attractive than production from organic- and clay-rich rocks. Copyright © 2019. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Bituminous materials; Calcite; Carbonation; Fertilizers; Gasoline; Limestone; Organic carbon; Maximum retention capacity; Organic matter richness; Petroleum generation; Petroleum potential; Reservoir characteristic; Rock-Eval pyrolysis; Total Organic Carbon; Western United States; Petroleum geology; bitumen; calcite; coccolith; kerogen; petroleum; pore space; pyrolysis; total organic carbon; Denver Basin; United States; Foraminifera
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/143795
作者单位	Section on Organic Geochemistry, GFZ, Telegrafenberg, Potsdam, Germany; German Research Centre for Geosciences (GFZ), Telegrafenberg, Potsdam, Germany; Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan, China; Section on Chemistry and Physics of Earth Materials, GFZ, Telegrafenberg, Potsdam, Germany; Noble Energy, Inc., Houston, TX, United States; BPX Energy, BP America Production Company, Denver, CO, United States
推荐引用方式 GB/T 7714	Han Y.,Horsfield B.,Mahlstedt N.,et al. Factors controlling source and reservoir characteristics in the Niobrara shale oil system; Denver Basin[J],2019,103(9).
APA	Han Y.,Horsfield B.,Mahlstedt N.,Wirth R.,Curry D.J.,&LaReau H..(2019).Factors controlling source and reservoir characteristics in the Niobrara shale oil system; Denver Basin.AAPG Bulletin,103(9).
MLA	Han Y.,et al."Factors controlling source and reservoir characteristics in the Niobrara shale oil system; Denver Basin".AAPG Bulletin 103.9(2019).