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Fault seal modelling – the influence of fluid properties on fault sealing capacity in hydrocarbon and CO2 systems
Petroleum Geoscience ( IF 1.7 ) Pub Date : 2020-03-04 , DOI: 10.1144/petgeo2019-126
Rūta Karolytė 1 , Gareth Johnson 2 , Graham Yielding 3 , Stuart M.V. Gilfillan 2
Affiliation  

Fault seal analysis is a key part of understanding the hydrocarbon trapping mechanisms in the petroleum industry. Fault seal research has also been expanded to CO2–brine systems for the application to carbon capture and storage (CCS). The wetting properties of rock-forming minerals in the presence of hydrocarbons or CO2 are a source of uncertainty in the calculations of capillary threshold pressure, which defines the fault sealing capacity. Here, we explore this uncertainty in a comparison study between two fault-sealed fields located in the Otway Basin, SE Australia. The Katnook Field in the Penola Trough is a methane field, while Boggy Creek in Port Campbell contains a high-CO2–methane mixture. Two industry standard fault seal modelling methods, one based on laboratory measurements of fault samples and the other based on a calibration of a global dataset of known sealing faults, are used to discuss their relative strengths and applicability to the CO2 storage context. We identify a range of interfacial tensions and contact angle values in the hydrocarbon–water system under the conditions assumed by the second method. Based on this, the uncertainty related to the spread in fluid properties was determined to be 24% of the calculated threshold capillary pressure value. We propose a methodology of threshold capillary pressure conversion from hydrocarbons–brine to the CO2–brine system, using an input of appropriate interfacial tension and contact angle under reservoir conditions. The method can be used for any fluid system where fluid properties are defined by these two parameters. Supplementary material: (1) Fault seal modelling methods and calculations, and (2) hydrocarbon and CO2 interfacial tensions and contact angle values collected in the literature are available at https://doi.org/10.6084/m9.figshare.c.4877049 This article is part of the Energy Geoscience Series available at https://www.lyellcollection.org/cc/energy-geoscience-series

中文翻译:

断层封闭建模——流体特性对碳氢化合物和二氧化碳系统中断层封闭能力的影响

断层封闭分析是了解石油工业中碳氢化合物捕集机制的关键部分。断层密封研究也已扩展到 CO2-盐水系统,以应用于碳捕集和封存 (CCS)。在碳氢化合物或 CO2 存在下造岩矿物的润湿特性是毛细管阈值压力计算的不确定性来源,毛细管阈值压力定义了断层封闭能力。在这里,我们在位于澳大利亚东南部奥特韦盆地的两个断层封闭油田之间的比较研究中探讨了这种不确定性。Penola 海槽中的 Katnook 油田是一个甲烷油田,而坎贝尔港的 Boggy Creek 油田则含有高 CO2 甲烷混合物。两种行业标准断层密封建模方法,一个基于断层样本的实验室测量,另一个基于已知密封断层的全球数据集的校准,用于讨论它们的相对强度和对 CO2 封存环境的适用性。在第二种方法假设的条件下,我们确定了烃-水系统中的一系列界面张力和接触角值。基于此,与流体特性分布相关的不确定性被确定为计算阈值毛细管压力值的 24%。我们提出了一种阈值毛细管压力从烃-卤水系统转换为 CO2-卤水系统的方法,在储层条件下使用适当的界面张力和接触角的输入。该方法可用于任何流体系统,其中流体特性由这两个参数定义。
更新日期:2020-03-04
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