气候变化领域集成服务门户(CCPortal): Underpressure in the northern Barents shelf: Causes and implications for hydrocarbon exploration

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DOI	10.1306/02272019146
	Underpressure in the northern Barents shelf: Causes and implications for hydrocarbon exploration
	Birchall T.; Senger K.; Hornum M.T.; Olaussen S.; Braathen A.
发表日期	2020
ISSN	0149-1423
起始页码	2267
结束页码	2295
卷号	104 期号:11
英文摘要	The underexplored Barents shelf petroleum province is a globally unique example where naturally occurring underpressure is observed offshore and onshore. In the offshore parts of the northern Barents shelf, minor underpressure (up to 23 bar below hydrostatic pressure) is observed in the fault-bounded Mesozoic reservoirs of the Fingerdjupet subbasin. More severe (50 bar below hydrostatic pressure although irregular, occurrences of underpressure are encountered in the Triassic intervals of the neighboring Greater Hoop area. The abnormal pressures extend to the onshore archipelago of Svalbard, where pressures exceeding 60 bar below hydrostatic were encountered during drilling for a CO2 sequestration project. In Svalbard, reservoir pressures were constantly monitored over 3 yr, providing an insight into the reservoir behavior at unique time scales. The low-permeability (<2 md) reservoir in Svalbard is exposed some 15 km to the north of the drill site. Quantitative analysis with the apparent lack of a regional lateral seal suggests a geologically recent origin of underpressure. Evidence that the underpressure extends into the top seal provides further indication to the likely cause of underpressure. Similar to many global occurrences of underpressure in petroleum provinces, the Barents shelf has undergone severe uplift, most recently caused by deglaciation. Well data, outcrop observations, and isotope data combined with the area's geological history indicate that glacial loading, unloading, and erosion, potentially with the aid of natural fractures, is the likely dominant underpressure-generating mechanism. Copyright © 2020. The American Association of Petroleum Geologists. All rights reserved.
英文关键词	Gasoline; Hydraulics; Hydrostatic pressure; Infill drilling; Offshore oil well production; Petroleum reservoir engineering; Seals; Unloading; Abnormal pressure; CO2 sequestration; Generating mechanism; Geological history; Hydrocarbon exploration; Low permeability; Naturally occurring; Reservoir pressures; Low permeability reservoirs; archipelago; carbon sequestration; deglaciation; drilling; hydrocarbon exploration; hydrostatic pressure; Mesozoic; outcrop; permeability; Triassic; uplift; Arctic; Arctic Ocean; Barents Sea; Svalbard; Svalbard and Jan Mayen
语种	英语
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/168681
作者单位	University Centre in Svalbard (UNIS), Svalbard, Norway; Department of Geoscience, University of Oslo, Blindern, Oslo, Norway; Department of Arctic Geology, UNIS, Svalbard, Norway; University of Copenhagen, Copenhagen, Denmark; UNIS, Svalbard, Norway; University of Oslo, Blindern, Oslo, Norway
推荐引用方式 GB/T 7714	Birchall T.,Senger K.,Hornum M.T.,et al. Underpressure in the northern Barents shelf: Causes and implications for hydrocarbon exploration[J],2020,104(11).
APA	Birchall T.,Senger K.,Hornum M.T.,Olaussen S.,&Braathen A..(2020).Underpressure in the northern Barents shelf: Causes and implications for hydrocarbon exploration.AAPG Bulletin,104(11).
MLA	Birchall T.,et al."Underpressure in the northern Barents shelf: Causes and implications for hydrocarbon exploration".AAPG Bulletin 104.11(2020).