Characterising along- and across-fault fluid flow properties for assessing flow rates and overburden fluid migration along faults - A case study from the North Sea

IF 1.9 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Petroleum Geoscience Pub Date : 2023-06-14 DOI:10.1144/petgeo2023-033

T. Bjørnarå, E. Skurtveit, E. Michie, Scott A. Smith

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引用次数: 1

Abstract

The article highlights the importance of understanding the permeability of fault zones as fluid migration pathways, with an example from the Vette Fault Zone in the North Sea. The study characterizes the hydraulic properties of the fault zone by mixing host rock lithologies into the fault zone and deriving the fault width from empirical relationships. A parametric study with 1125 model realizations was conducted to understand the sensitivity related to uncertainties in overburden lithologies and fault width correlations. The study found that the fault zone significantly alters the flow-field compared to a model that only considers lithological juxtaposition. The most significant hydraulic communication in the Vette Fault Zone is downwards from the storage reservoir where sand is mixed into the fault zone. The models highlight the potential for downward hydraulic communication along the fault for brine and CO 2 capillary sealing towards the overburden. Thematic collection: This article is part of the Fault and top seals collection available at: www.lyellcollection.org/topic/collections/fault-and-top-seals-2022

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描述沿断层和跨断层流体流动特性，以评估流速和沿断层的上覆流体运移——以北海为例

本文以北海Vette断裂带为例，强调了理解断裂带渗透率作为流体运移通道的重要性。该研究通过将主岩岩性混入断裂带中，并根据经验关系推导出断层宽度，表征了断裂带的水力性质。利用1125个模型实现进行参数化研究，以了解覆盖层岩性和断层宽度相关性不确定性的敏感性。研究发现，与只考虑岩性并置的模型相比，断裂带显著地改变了流场。在Vette断裂带中，最重要的水力通信是从储层向下进行的，在储层中砂被混合到断裂带中。这些模型强调了沿断层向下的水力通信对上覆岩的盐水和co2毛细管密封的潜力。专题合集:本文是故障和顶部密封合集的一部分，可在:www.lyellcollection.org/topic/collections/fault-and-top-seals-2022

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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.