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Advanced Spatial Modeling on Distribution and Physical Property of Faults for Predicting Hydraulic Phenomena over Ultra-long Term

用于预测超长期水力现象的断层分布和物理性质的高级空间建模

基本信息

批准号：
18360430
负责人：
KOIKE Katsuaki
金额：
$ 5.76万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

This study has characterized the fault functions for fluid paths and crustal movements from the following four points of data analyses, sample measurements, and field surveys. The fracture data obtained by rock surface surveys and deep drillings at the Kikuma and Toki granite areas in west Japan were used for the analyses.1. Two 3D spatial modeling methods, OPTSIM for discontinuous geologic layers and physical properties and GEOFRAC for fractures including joints and faults, were developed. A mechanical minimization criterion and a stochastic simulation were combined for OPTSIM. GEOFRAC incorporates the directions(strikes and dips)of the fracture data into the simulation. At first, fracture locations are generated randomly following fracture densities. Fracture directions are transformed into an indicator set consisting of seven binary variables and the variables are compressed using the principal component analysis. Kriging is then employed to estimate the distributions of these princ … More ipal values. Finally, element fractures are determined from the simulated locations and directions, and the fractures within the angle and distance tolerances are connected to form a fracture plane. GEOFRAC was shown to be able to depict a plausible fault system because the simulated directions corresponded well to those measured. In addition, regional hydraulic conductivities of fault zone were calculated by an inversion analysis of the subsurface temperature distribution.2. Spatial distributions of filling minerals of fractures were modeled, which contributed to specify the fluid paths through continuous fractures and faults.3. Lineaments detected from multi-shaded Digital Elevation Model were used as large-scale fracture elements. Using the simulated continuous fractures and lineaments, similarity on the dominant directions and the histogram shapes of length distributions were identified.4. A part of heterogeneity in fault dynamics and hydraulic property were clarified through measuring and analyzing the radioactive nuclides in the top soils on fault zones. Less

本研究从资料分析、样品测量和野外调查四个方面，描述了断层对流体路径和地壳运动的作用。在日本西部的菊间和常岐花岗岩地区，通过岩石表面调查和深钻获得的断裂数据被用于分析。开发了两种三维空间建模方法，OPTSIM用于不连续地质层和物理性质，GEOFRAC用于裂缝（包括节理和断层）。OPTSIM采用了力学极小化准则和随机模拟相结合的方法。GEOFRAC将裂缝数据的方向（走向和倾角）纳入模拟。首先，根据裂缝密度随机生成裂缝位置。将裂缝方向转化为由7个二元变量组成的指标集，并使用主成分分析对变量进行压缩。然后，采用克里格法来估计这些原则的分布。 ...更多信息 ipal值。最后，从模拟的位置和方向确定单元裂缝，并且将角度和距离公差内的裂缝连接以形成裂缝平面。GEOFRAC被证明是能够描绘一个合理的故障系统，因为模拟的方向对应以及那些测量。此外，通过对地下温度分布的反演分析，计算了断裂带的区域导水率.模拟了裂隙中充填矿物的空间分布，有助于明确流体通过连续裂隙和断层的路径.从多重阴影数字高程模型检测到的线性体被用作大尺度断裂单元。利用模拟的连续裂缝和线性构造，识别了优势方向上的相似性和长度分布的直方图形状.通过对断层带表层土壤中放射性核素含量的测定和分析，阐明了断层动力学和水力学性质的部分不均匀性。少