CAA: Crystal Size and Fluid Flow in Dolostone Aquifers and Reserviors

研究流体在多孔岩石中的渗流是研究岩石力学的重要内容。 地下水水文学和污染物保护。 以前的工作 已经表明，流体流动是由以下因素控制的， 孔隙度、沉积粒度、粒间胶结物和 填隙泥 这些因素可以很容易地测量， 广泛用于多孔介质建模。 该项目旨在评估 另一个参数晶体尺寸对流体流动的影响， 白云岩含水层 图像分析是计算机技术的一种新兴应用， 开发和结果应扩大其效用内 工程和地球科学。 此外，该项目还涉及 自然界中流体流动控制的基本问题 材料以及这些控制措施对 古水文和成岩作用 结果将有助于满足 国家对水和石油的需求。 在硅质岩中，流体在沉积颗粒之间流动 它们聚集在一起，通常会留下大的，连接良好的， 粒间孔隙 水泥可能会沉淀到其中 孔隙空间，但基本控制的组构是沉积。 在白云岩中，流体在晶体之间流动， 在马赛克中结合在一起;孔隙网络由窄的， 片状空间 因此，白云岩中的流体流动取决于 晶间孔隙系统的弯曲度和孔隙宽度， 其本身与晶体尺寸密切相关。 晶体尺寸 通常受成岩作用而不是沉积作用的控制 流程. 白云岩含水层通常是非常精细的结晶， 用标准的解剖显微镜进行分析 图像分析， 使用核心材料和解剖显微镜， 增强的放大率，使得有可能进行统计 晶体尺寸范围和尺寸分布的分析。 这些可以 与其他结构参数相关，并与岩心相关 分析数据。 该项目将使用大约30个较低的圣安德烈斯 在晶体尺寸与渗透率的详细研究中， 可传递性。

Study of fluid flow through porous rocks is vital to studies of groundwater hydrology and contaminant protection. Previous work has shown that fluid flow is controlled by factors such as porosity, sedimentary grain size, interparticle cement and interstitial mud. Such factors can be measured easily and are widely used in modelling porous media. This project aims to assess the impact of another parameter, CRYSTAL SIZE, on fluid flow in dolostone aquifers. An emerging application of computer-technology, image analysis will be developed and the results shall expand its utility within engineering and geosciences. In addition, the project deals with fundamental questions of the controls of fluid flow in natural materials and the effects that these controls have upon paleohydrology and diagenesis. The results will help satisfy the nation's needs for water and petroleum. In siliclastic rocks, fluids flow between sedimentary particles that are packed together, commonly leaving large, well-connected, interparticle pore spaces. Cements may be precipitated into these pore spaces, but the basic control of the fabric is depositional. In dolostones, fluids flow between crystals that are fitted together in a mosaic; the pore network consists of narrow, sheetlike spaces. Fluid flow in dolostones thus depends on the tortuosity and pore width of the intercrystalline pore system, which are themselves closely related to crystal size. Crystal size is commonly controlled by diagenetic rather than depositional processes. Dolomite aquifers are commonly very finely crystalline, difficult to analyze with a standard dissecting microscope. Image analysis, using core material and a dissecting microscope with slightly enhanced magnification, makes it possible to carry out statistical analyses of crystal size ranges and size distributions. These can be correlated with other textural parameters, and with core analysis data. The project will use around 30 lower San Andres cores in a detailed study of crystal size versus permeability and transmissibility.