Outcrop Characterization of Heterogeneity: Explicit Linkage of Hydrological and Sedimentological Properties

露头的非均质性特征：水文和沉积物特性的明确联系

• 批准号: 9706116
• 负责人: Gary Smith
• 金额: $ 12万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 2001-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706116&HistoricalAwards=false
• 关键词: Outcrop; Characterization; Heterogeneity; Explicit; Linkage

9706116 Smith Field sedimentological and hydrological studies of outcrop analogs for heterogeneous aquifers provide conceptualizations of heterogeneity unrealized by subsurface information and provide a means for assessing the validity and performance of popular stochastic models based on interpolation of well data. The approach, widely used for decades in the hydrocarbon industry, has seen little application to hydrological problems. Sedimentological studies of well-exposed rift-basin alluvium will be complemented by in-situ measurements of permeability, thus permitting designation of hydrofacies with defined hydraulic conductivity, shape, and boundaries that are linked with lithofacies whose distribution is related to depositional processes that formed the aquifer material. Outcrop data will be used to formulate a three-dimensional model of heterogeneity at the scale of typical subsurface-contaminant-migration scenarios. The study-site stratigraphy will also be simulated by geostatistical techniques using measured sections as conditioning data in much the same way as well data are used to condition subsurface models. The predictive ability of the simulation will be gauged by comparison to the outcrop data. The outcrop model will be subjected to flow simulations for varying scales (meters to tens of meters) of outcrop-defined heterogeneity to evaluate the quantity and type of data required for high-resolution prediction of flow paths and rates. The depositional environment selected for outcrop characterization is especially important for understanding aquifer heterogeneity in extensional basins of the southwestern United States, where studies to date have not adequately described the sedimentological characteristics that are of hydrogeological importance. The largest volume of clastic detritus deposited in asymmetric extensional basins is delivered from the hanging wall to the master fault. These alluvial-slope facies are the least well known deposits in rift basins. This projec t will produce the first outcrop analog for aquifer characteristics of alluvial-slope deposits by providing detailed three dimensional documentation of hydrofacies permeability, shape, and boundaries within an extraordinarily well exposed basin-fill sequence in the northern Rio Grande rift of New Mexico.

9706116史密斯田间沉积和水文研究异质含水层的露头类似物提供了异质性的概念化，该异质性是在地下信息中未实现的，并提供了一种评估基于井数据插值的流行随机模型的有效性和性能的方法。 这种方法在碳氢化合物行业数十年来广泛使用，几乎没有在水文问题上应用。 暴露良好的裂谷菌等菌菌的沉积学研究将由原位测量渗透率进行补充，从而允许使用定义的水力传导率，形状和边界来指定与岩体相关的与岩性相关的岩化相关的含量与形成含水材料的沉积过程相关的水平。 露头数据将用于在典型的地下 - 抗抑制迁移方案的规模下制定三维模型的异质性模型。 研究站点的地层学还将通过测量阶段作为调节数据以与数据相同的方式来调节地下模型来模拟地统计技术。 通过与露头数据进行比较，将测量模拟的预测能力。 露头模型将进行露头定义异质性不同尺度（至数十米）的不同尺度（米）的流量模拟，以评估流动路径和速率高分辨率预测所需的数据数量和类型。 选择用于露头表征的沉积环境对于理解美国西南部延伸盆地的含水层异质性尤为重要，迄今为止，研究尚未充分描述具有水文地质重要性的沉积学特征。 沉积在非对称延伸盆地中的碎屑碎屑最大的碎屑是从悬挂壁传递到主断层的。 这些冲积斜面相是裂谷盆地中最不知名的沉积物。 通过提供详细的三维渗透率，形状和边界的详细文档，在新墨西哥州北部的里奥大rifter中，该详细的水电性，形状和边界中的详细文档，将产生一个用于冲积斜率沉积物的含水层特征的第一个露头类似物。