Petroleum generation and migration through the Faroe-Shetland Basin - The role of Igneous Intrusions

IF 1.9 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Petroleum Geoscience Pub Date : 2023-09-14 DOI:10.1144/petgeo2022-084

A. Mangione, N. Schofield, S. Holford, C. Grove, C. Ellis, C. Forster, O. Schenk, D. Gardiner, B. Hedley, L. Broadley, J.R. Underhill

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Abstract

Previous basin modelling of the Faroe-Shetland Basin (FSB, offshore UK) has suggested mid-Cretaceous petroleum generation, which predates the deposition of the working Paleogene reservoirs and traps. To justify the time discrepancy between generation, reservoir and trap formation, factors such as intermediary accumulations and overpressure have been invoked. However, across much of the FSB, the Cretaceous sequences that overly the Kimmeridgian source rock are heavily intruded by Paleogene-aged intrusions. Recent modelling has shown that the emplacement of the intrusions, coupled with lower radiogenic heat production from underlying basement, leads to estimates of petroleum generation occurring up to 40 Myr more recently than suggested by previous models. In this work, we seek to better understand the role that igneous intrusions have exerted on petroleum generation and migration in the FSB. Models with varying thicknesses of Paleogene intrusions are compared with those that consider the Cretaceous sequence as purely sedimentary (i.e. similar to assumptions in previous modelling). The estimated times of petroleum generation are compared with geochronological constraints on the ages of oils (i.e. 90-68 Ma) and deposition and formation of other petroleum system elements. By considering only the effect of igneous intrusions, the expulsion onset from the source rocks is retarded by up to approximately 12 Myr. In addition, our models show the impact of the intrusions on petroleum saturation and migration suggesting that intrusions have potentially compartmentalised the basin, trapping petroleum beneath or within the sill complex. Finally, our findings suggest that basin models in regions impacted by significant magmatism need to consider the impact of intrusions to more accurately constrain both petroleum generation and migration. Thematic collection: This article is part of the UKCS Atlantic Margin collection available at: https://www.lyellcollection.org/topic/collections/new-learning-from-exploration-and-development-in-the-ukcs-atlantic-margin

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法罗-设得兰盆地油气生成与运移——火成岩侵入的作用

以前的法罗-设得兰盆地(FSB，英国近海)的盆地建模表明，白垩纪中期有石油生成，早于古近纪储层和圈闭的沉积。为了证明生成、储层和圈闭形成之间的时间差异，人们援引了中间聚集和超压等因素。然而，在FSB的大部分地区，超过基默里纪烃源岩的白垩纪层序被古近系的侵入物严重侵入。最近的模拟表明，侵入体的就位，加上来自下伏基底的放射性成因热产量降低，导致石油生成的估计时间比以前的模型所建议的要晚40兆瓦。在这项工作中，我们试图更好地理解火成岩侵入对FSB中石油生成和运移的作用。将具有不同厚度的古近系侵入体的模型与将白垩纪层序视为纯沉积层序的模型(即类似于先前模型中的假设)进行比较。估计的石油生成时间与地质年代学对石油年龄的限制(即90-68 Ma)以及其他石油系统要素的沉积和形成进行了比较。如果只考虑火成岩侵入的影响，则烃源岩的排烃开始延迟约12myr。此外，我们的模型显示了侵入物对石油饱和度和运移的影响，表明侵入物潜在地划分了盆地，将石油困在储层复合体下方或内部。最后，我们的研究结果表明，在岩浆作用明显的地区，盆地模型需要考虑侵入的影响，以更准确地约束石油的生成和运移。专题集合:这篇文章是可在:https://www.lyellcollection.org/topic/collections/new-learning-from-exploration-and-development-in-the-ukcs-atlantic-margin得到的UKCS大西洋边缘集合的一部分

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来源期刊

Petroleum Geoscience 地学-地球科学综合

CiteScore

4.80

自引率

11.80%

发文量

审稿时长

>12 weeks

期刊介绍： Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.