Predicting Physical Properties of Fluid-Containing Rocks from Percolation Model Results

根据渗流模型结果预测含流体岩石的物理性质

• 批准号: 0409279
• 负责人: Herbert Wang
• 金额: $ 4万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0409279&HistoricalAwards=false
• 关键词: Predicting; Physical; Properties; Fluid; Containing

0409279WangThe physics of displacement of water by an invading liquid or gas is an importantgeologic and engineering process. Examples include the migration of oil or gas intobrine-saturated rock or remediation of contaminated aquifers by injection of air. Thedistribution of the invading fluid can include intricate fingering due to the inherentrandomness of the pore structure and its influence on capillary forces. A successfulmethod to simulate the invading air is through a pore-scale, modified invasionpercolation model in which the rock's void space is represented by a statisticaldistribution of pore and throat sizes. Each pore is connected to several throats. Thethroat on the air-water interface that is invaded is the one at which the driving potentialsumming gravity, capillary, and viscous forces is greatest. The scientific goal of thisproject is to connect the distribution of the fluid phases obtained from the percolationmodel to predict the elastic and electrical properties of the bulk rock formation. Theinnovation proposed is to use a process-based quantification of fluid saturation at the porescale as the basis for predicting physical properties that are extremely sensitive to thefluid distribution. These predictions are important for inferring the fluid saturations fromgeophysical measurements. The working hypothesis is that the size distribution of thedefending water clusters is critical to the bulk elastic behavior. Small, isolated waterclusters behave in an elastically soft manner because the water is able to flow into nearbyair-filled voids. New laboratory measurements of elastic wave velocities duringevaporative drying are proposed. They and recent electrical resistivity measurementsduring evaporative drying conducted at Louisiana State University will be used tocalibrate and test the modeling process.Broader ImpactsThis research is expected have applications in exploring hydrocarbon reservoirs and inmonitoring remediation of contaminated aquifers. This research will provide key rocklaboratory measurements and modeling tools to simulate the displacement of water by airor gas and then predict the changes in geophysical properties. New data collected onchanges of elastic wave velocities during evaporative drying will be useful to otherresearchers testing their models. The research results will be disseminated throughpublications and oral presentations. The computer codes that will be developed as part ofthe research will be useful to researchers in industry and will be made available on theinternet.

水被侵入的液体或气体驱替的物理过程是一个重要的地质和工程过程。例如，石油或天然气迁移到盐水饱和的岩石中，或通过注入空气对受污染的含水层进行补救。由于孔隙结构的内在随机性及其对毛细管力的影响，侵入流体的分布可能包括复杂的指进。一个成功的方法来模拟入侵的空气是通过一个孔隙尺度，修改后的入侵渗流模型，其中岩石的空隙空间是由一个approximaldistribution的孔隙和喉道尺寸。每一个毛孔都连接着几个咽喉。被侵入的气-水界面上的喉道是重力、毛细管力和粘滞力之和的驱动力最大的地方。该项目的科学目标是将从膨胀模型中获得的流体相分布联系起来，以预测大块岩石地层的弹性和电学性质。提出的创新是使用基于过程的流体饱和度在孔隙尺度作为预测的基础上，是非常敏感的流体分布的物理性质的量化。这些预测对于从地球物理测量推断流体饱和度是重要的。工作假设是，防御水团簇的尺寸分布是至关重要的体弹性行为。小的、孤立的水分子团以弹性柔软的方式表现，因为水能够流入附近充满空气的空隙。本文提出了蒸发干燥过程中弹性波速度的新的实验室测量方法。他们和最近的电阻率measurementsduring蒸发干燥在路易斯安那州州立大学进行将被用来校准和测试的建模process.Broader ImpactsThis研究预计有应用在勘探油气藏和污染含水层的监测修复。这项研究将提供关键的岩石实验室测量和模拟工具，以模拟空气驱替水，然后预测地球物理性质的变化。收集到的关于蒸发干燥过程中弹性波速度变化的新数据将对其他测试他们模型的研究人员有用。研究成果将通过出版物和口头报告传播。作为研究的一部分而开发的计算机代码将对工业界的研究人员有用，并将在互联网上提供。