气候变化领域集成服务门户(CCPortal): Seal failure assessment of a major gas field via integration of seal properties and leakage phenomena

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DOI	10.1306/02282018111
	Seal failure assessment of a major gas field via integration of seal properties and leakage phenomena
	Foschi M.; Cartwright J.A.
发表日期	2020
ISSN	0149-1423
起始页码	1627
结束页码	1648
卷号	104 期号:8
英文摘要	We present a seismic- and well-based interpretation of a large leakage zone above the Scarborough gas field, Exmouth plateau, North West shelf of Australia. This leakage zone, well imaged on three-dimensional seismic data, extends over a region of 100 km2 (39 mi2), encompassing both the crest and flanks of the anticlinal trap, and is termed here as distributed crestal leakage. The present-day gas-water contact is 85 m (278 ft), and the spillpoint is 110 m (328 ft) below the crest, implying that the trap is underfilled at present. The leakage zone comprises more than 500 pockmarks at the present-day seabed with no crosscutting or cannibalization, suggesting that they formed in a short interval of time. These are underlain by sediment remobilization features and amplitude anomalies, consistent with a relatively high flux leakage of gas from the underlying Cretaceous deep-water sand-rich reservoir. By analyzing the geometrical relationship between the leakage zone, the top-seal properties, and the gas-water contact, we conclude that the mode of leakage in this specific setting is not the result of gradual addition of gas charge but is instead consistent with a sudden increase of aquifer overpressure. We suggest two alternative models for seal failure in this case study: a conservative model consistent with a modest but rapid increase in aquifer overpressure leading to membrane seal failure and a model dominated by high aquifer overpressure leading to leakage through hydraulically dilated faults and fractures. © 2020. The American Association of Petroleum Geologists. All rights reserved.
语种	英语
scopus关键词	Aquifers; Gases; Offshore gas fields; Seismic prospecting; Seismology; Amplitude anomalies; Conservative modeling; Gas-water contacts; Geometrical relationship; North west shelf of australia; Remobilization; Short-interval; Three dimensional seismic data; Seals; amplitude; anticline; aquifer; assessment method; data interpretation; failure mechanism; gas field; leakage; membrane; overpressure; remobilization; Indian Ocean; Scarborough Gas Field; Timor Sea
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/143681
作者单位	Shell Geoscience Laboratory, Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Foschi M.,Cartwright J.A.. Seal failure assessment of a major gas field via integration of seal properties and leakage phenomena[J],2020,104(8).
APA	Foschi M.,&Cartwright J.A..(2020).Seal failure assessment of a major gas field via integration of seal properties and leakage phenomena.AAPG Bulletin,104(8).
MLA	Foschi M.,et al."Seal failure assessment of a major gas field via integration of seal properties and leakage phenomena".AAPG Bulletin 104.8(2020).