Faults are often assumed to play a significant role in the migration and entrapment of hydrocarbons, either offering conduits for, or barriers to, fluid flow. They may also affect fluid-phase trapping and influence phase fractionation in the subsurface. A Monte Carlo modelling approach is used to model these effects for trap analysis. The aim is to show how varying fault seal capacity, the fault orientation, the regional stress tensor and the trap geometry can all affect how both oil and gas are retained within a trap. The model reduces the problem to a 1D analysis with a structural description depth-referenced to the crest of a prospect. Both juxtaposition and membrane fault seal are modelled, together with hydrodynamic effects and fault reactivation risk. The potential of a prospect to trap hydrocarbons is evaluated in a roll-up of results with the outputs including a predicted hydrocarbon column height distribution and column height control statistics. The technique also offers an insight into the potential fluid-phase partitioning that may occur dependent on the interplay between the active leakage mechanisms and spill control, enabling gas v. oil columns to be predicted. Thematic collection: This article is part of the Fault and top seals collection available at: https://www.lyellcollection.org/cc/fault-and-top-seals-2019

中文翻译：

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使用蒙特卡罗模型预测烃柱高度并说明断层如何影响浮力流体截留

断层通常被认为在碳氢化合物的迁移和截留中起着重要作用，为流体流动提供管道或障碍。它们还可能影响流体相捕获并影响地下的相分馏。Monte Carlo 建模方法用于对这些影响进行建模以进行陷阱分析。目的是展示断层封闭能力、断层方向、区域应力张量和圈闭几何形状的变化如何影响油气在圈闭内的保留方式。该模型将问题简化为 1D 分析，其中结构描述深度参考远景峰顶。对并置和膜断层封闭以及水动力效应和断层再激活风险都进行了建模。在结果汇总中评估远景捕获碳氢化合物的潜力，输出包括预测的碳氢化合物柱高度分布和柱高度控制统计数据。该技术还提供了对可能发生的潜在流体相分配的洞察，这取决于主动泄漏机制和溢出控制之间的相互作用，从而能够预测气柱与油柱。专题收藏：本文是断层和顶部海豹收藏的一部分，可在以下网址获取：https://www.lyellcollection.org/cc/fault-and-top-seals-2019 该技术还提供了对可能发生的潜在流体相分配的洞察，这取决于主动泄漏机制和溢出控制之间的相互作用，从而能够预测气柱与油柱。专题收藏：本文是断层和顶部海豹收藏的一部分，可在以下网址获取：https://www.lyellcollection.org/cc/fault-and-top-seals-2019 该技术还提供了对可能发生的潜在流体相分配的洞察，这取决于主动泄漏机制和溢出控制之间的相互作用，从而能够预测气柱与油柱。专题收藏：本文是断层和顶部海豹收藏的一部分，可在以下网址获取：https://www.lyellcollection.org/cc/fault-and-top-seals-2019