Advanced petrophysics for the characterisation of trapping mechanisms for CO2 storage in the subsurface

用于表征地下二氧化碳封存捕集机制的先进岩石物理学

• 批准号: 2293851
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2293851
• 关键词: Advanced; petrophysics; characterisation; trapping; mechanisms

This project will use the latest in petrophysical and digital rock core technology to improve our understanding of capillary and solubility trapping of CO2 in the subsurface, providing workflows and constitutive laws for a physics based representation of residual and dissolution trapping in field scale simulation. These are essential to enabling reliable modelling and assessment of potential geological CO2 storage sites.Experimental core floods with X-ray imaging at two scales - where pore scale features may be resolved in mm-scale samples in a micro XCT scanner, and where continuum properties are observed over cm-scale rock cores in a medical XCT scanner - will be combined with numerical modelling to meet the following objectives:1. Evaluate the impacts of rock heterogeneity on upscaled residual trapping, including the development of a characterisation workflow,2. Observe rates of mass transfer between CO2 and brine as a function of fluid flow rates, fluid saturations, fluid-fluid interfacial areas, distance from chemical equilibrium of the fluid system and length scale, including the development of a constitutive law to represent these rates in reservoir simulationContinuum numerical models of rock cores will be constructed, based on these observations of residual trapping in heterogeneous rock cores. Initial upscaling from these small size scales will be performed to develop an indication of the parameter space in which small scale heterogeneities must be characterised for accurate predictions of field scale trapping.

该项目将使用最新的岩石物理和数字岩心技术，以提高我们对地下CO2毛细管和溶解度捕获的理解，为现场规模模拟中基于物理的残余和溶解捕获表示提供工作流程和本构律。这对于可靠地模拟和评估潜在的CO2地质封存点至关重要。将利用两种尺度的X射线成像进行实验性岩心驱替--在微型XCT扫描仪中可以在毫米尺度的样品中分辨孔隙尺度特征，在医用XCT扫描仪中可以在厘米尺度的岩心上观察连续体特性--与数值模拟相结合，以实现以下目标：1.评估岩石非均质性对放大残余圈闭的影响，包括开发表征工作流程，2.观察CO2和盐水之间的质量传递速率，作为流体流速、流体饱和度、流体-流体界面面积、流体系统化学平衡距离和长度尺度的函数，包括开发本构律以在油藏模拟中代表这些速率。基于对非均质岩心中残留圈闭的观察，将构建岩心的连续数值模型。从这些小尺寸尺度的初始放大将进行开发的参数空间的指示，其中小规模的异质性必须进行表征，以准确预测的字段规模捕获。