气候变化领域集成服务门户(CCPortal): Overpressure transmission through interconnected igneous intrusions

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DOI	10.1306/05091918193
	Overpressure transmission through interconnected igneous intrusions
	Schofield N.; Holford S.; Edwards A.; Mark N.; Pugliese S.
发表日期	2020
ISSN	0149-1423
起始页码	285
结束页码	303
卷号	104 期号:2
英文摘要	In situ overpressures in sedimentary basins are commonly attributed to disequilibrium compaction or fluid expansion mechanisms, although overpressures in shallow sedimentary sequences may also develop by vertical transfer of pressure from deeper basin levels, for example, via faults. Mafic sill complexes are common features of sedimentary basins at rifted continental margins, often comprising networks of interconnected sills and dikes that facilitate the transfer of magma over considerable vertical distances to shallow basinal depths. Here, we document evidence for deep sills (depths >5 km [>16,000 ft]) hosting permeable, open fracture systems that may have allowed transmission of overpressure from ultradeep basinal (>7 km [>23,000 ft]) levels in the Faroe-Shetland Basin, northeast Atlantic margin. Most notably, well 214/28-1 encountered overpressured, thin (<8 m [<26 ft]), and fractured gas-charged intrusions, which resulted in temporary loss of well control. Although the overpressure could reflect local gas generation related to thermal maturation of Cretaceous shales into which the sills were emplaced, this would require the overpressures to have been sustained for unfeasibly long timescales (>58 m.y.). We instead suggest that transgressive, interconnected sill complexes, such as those penetrated by well 214/28-1, may represent a previously unrecognized mechanism of transferring overpressures (and indeed hydrocarbons) laterally and vertically from deep to shallow levels in sedimentary basins and that they represent a potentially underrecognized hazard to both scientific and petroleum drilling in the vicinity of subsurface igneous complexes. © 2020 American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Complex networks; Sedimentology; Settling tanks; Fracture systems; North East Atlantic; Overpressure transmissions; Petroleum drilling; Rifted continental margin; Sedimentary basin; Sedimentary sequence; Thermal maturation; Oil well drilling; connectivity; fluid expulsion; igneous intrusion; petroleum engineering; petroleum hydrocarbon; pressure field; sedimentary basin; shale gas; thermal maturity
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/143725
作者单位	Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, United Kingdom; Australian School of Petroleum, University of Adelaide, Adelaide, SA, Australia; Ikon Science Ltd., London, United Kingdom; Chrysaor, London, United Kingdom
推荐引用方式 GB/T 7714	Schofield N.,Holford S.,Edwards A.,et al. Overpressure transmission through interconnected igneous intrusions[J],2020,104(2).
APA	Schofield N.,Holford S.,Edwards A.,Mark N.,&Pugliese S..(2020).Overpressure transmission through interconnected igneous intrusions.AAPG Bulletin,104(2).
MLA	Schofield N.,et al."Overpressure transmission through interconnected igneous intrusions".AAPG Bulletin 104.2(2020).