Assessing the impact of hydrodynamics on capillary seal capacity: application of the Manzocchi & Childs model in trap analysis workflows

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Neil T. Grant
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引用次数: 0

Abstract

The evaluation of seal in conventional stratigraphic and structural traps requires the characterisation of the capillary top seal to assess the capacity to hold a hydrocarbon column. Typically, this seal analysis addresses the static seal and does not consider the role that hydrodynamics (the flow of water into or out of the shale seal) may play in influencing the seal capacity. Although possessing extremely low permeability, shale seals are not perfect seals and water can move through them under an imposed hydraulic gradient. Likewise, water can flow through trapped hydrocarbon columns even though relative permeabilities can be very low (Teige et al., 2005). The impact of this flow on the capillary seal capacity can, in theory, be quite profound and should be considered in seal analysis workflows. This paper revisits the Manzocchi & Childs (2013) model for hydrodynamic effects on capillary seals and employs it directly in real-world trap analysis. The implementation of this model is described, and a workflow developed to incorporate the impact of hydrodynamics into column height prediction. The technique is applied to several known over-pressured fields from the Norwegian continental shelf to evaluate its applicability. Preliminary results from Monte Carlo modelling are promising and appear to offer some agreement between the observed column heights and the predicted hydrodynamic seal-controlled columns, dependant on the parameterisation used. Further testing is ongoing, but the methodology should be considered for routine application, particularly in exploration prospect evaluation. The impact of hydrodynamics on seal capacities should not be discounted. Thematic collection: This article is part of the Fault and top seals 2022 collection available at: https://www.lyellcollection.org/topic/collections/fault-and-top-seals-2022
评估流体力学对毛细管密封能力的影响:在捕集器分析工作流程中应用 Manzocchi & Childs 模型
对常规地层和构造陷阱的密封性进行评估时,需要对毛细管顶部密封的特性进行分析,以评估其保持烃柱的能力。通常情况下,这种密封分析针对的是静态密封,并不考虑流体力学(水流入或流出页岩密封)对密封能力的影响。虽然页岩密封具有极低的渗透性,但并不是完美的密封,在施加水力梯度的情况下,水可能会流经页岩密封。同样,即使相对渗透率很低,水也会流经被困的烃柱(Teige 等人,2005 年)。理论上,这种流动对毛细管密封能力的影响可能非常大,在密封分析工作流程中应加以考虑。本文重温了 Manzocchi & Childs(2013 年)的毛细管密封流体动力效应模型,并将其直接用于实际捕集器分析。本文介绍了该模型的实施,并开发了一个工作流程,将流体力学的影响纳入柱高预测。该技术应用于挪威大陆架的几个已知过压油田,以评估其适用性。蒙特卡罗建模的初步结果很有希望,观测到的油柱高度与预测的流体力学密封控制油柱之间似乎有一定的一致性,这取决于所使用的参数。目前正在进行进一步测试,但应考虑将该方法用于常规应用,特别是勘探前景评估。不应忽视流体力学对密封能力的影响。 专题集锦: 本文是断层和顶部密封 2022 专题集的一部分,可从以下网址获取: https://www.lyellcollection.org/topic/collections/fault-and-top-seals-2022
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
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.
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