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首页> 外文期刊>Computers & geosciences >Migration tracing and kinematic state concept embedded in discrete fracture network for modeling hydrocarbon migration around unlined rock caverns
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Migration tracing and kinematic state concept embedded in discrete fracture network for modeling hydrocarbon migration around unlined rock caverns

机译：嵌入离散裂缝网络中的运移追踪和运动状态概念，用于模拟无衬砌岩洞周围的油气运移

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摘要

This paper presents a numerical method for the modeling of hydraulic confinement and hydrocarbon migration around the unlined rock caverns (URCs) by directly applying distinct fracture network (DFN) concept. A "migration tracing" algorithm for the assessment of hydrocarbon migration around URCs was developed based on the applying migration cessation criterion and pathway analysis in the DFN realizations. The veracity of the developed numerical method was explored by predicting the hydrocarbon migration in a uniform fracture network around an unlined cavern that consists with results obtained from the finite element continuum fluid flow analysis. Finally, the applicability of the proposed method was evaluated by simulation of hydrocarbon migration in the DFN realizations around a URC. The results demonstrate that the hydrocarbon migration is sensitive to the hydraulic boundary conditions, and the geometrical properties of fractures. Establishing sufficient water pressure in the fracture system controls hydrocarbon migration; however, the effect of external water pressure on the hydrocarbon migration is controlled by the fractures geometry. Consequently, local migration paths may develop around storage caverns through the intricately connected fracture network, despite the presence of high pressurized water curtain. The proposed method may prove useful for better design analysis of hydraulic confinement around URCs, or inclusions in simulators for computational demands. (C) 2016 Published by Elsevier Ltd.
机译：本文提出了一种数值方法，该方法通过直接应用独特的裂缝网络（DFN）概念来模拟无衬砌岩洞（URC）周围的水力约束和油气运移。基于在DFN实现中应​​用迁移停止准则和路径分析，开发了一种用于评估URC周围油气迁移的“迁移追踪”算法。通过预测无衬砌洞穴周围均匀裂缝网络中的油气运移，探索了开发的数值方法的准确性，该结果包括有限元连续流体流动分析的结果。最后，通过模拟围绕URC的DFN实现中的烃运移，评估了该方法的适用性。结果表明，油气运移对水力边界条件和裂缝的几何性质敏感。在压裂系统中建立足够的水压可控制油气的运移。但是，外部水压对油气运移的影响是由裂缝的几何形状控制的。因此，尽管存在高压水幕，但仍可能通过错综复杂的裂缝网络在存储洞穴周围形成局部迁移路径。所提出的方法可能对更好地分析URC周围的水力约束或为计算需求而包含在模拟器中可能是有用的。 （C）2016由Elsevier Ltd.出版

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