Dixie Valley Engineered Geothermal System Exploration Methodology Project, Baseline Conceptual Model Report

The Engineered Geothermal System (EGS) Exploration Methodology Project is developing an exploration approach for EGS through the integration of geoscientific data. The Project chose the Dixie Valley Geothermal System in Nevada as a field laboratory site for methodlogy calibration purposes because, in the public domain, it is a highly characterized geothermal systems in the Basin and Range with a considerable amount of geoscience and most importantly, well data. This Baseline Conceptual Model report summarizes the results of the first three project tasks (1) collect and assess the existing public domain geoscience data, (2) design and populate a GIS database, and (3) develop a baseline (existing data) geothermal conceptual model, evaluate geostatistical relationships, and generate baseline, coupled EGS favorability/trust maps from +1km above sea level (asl) to -4km asl for the Calibration Area (Dixie Valley Geothermal Wellfield) to identify EGS drilling targets at a scale of 5km x 5km. It presents (1) an assessment of the readily available public domain data and some proprietary data provided by Terra-Gen Power, LLC, (2) a re-interpretation of these data as required, (3) an exploratory geostatistical data analysis, (4) the baseline geothermal conceptual model, and (5) the EGS favorability/trust mapping. The conceptual model presented applies to both the hydrothermal system and EGS in the Dixie Valley region.

增强型地热系统（Engineered Geothermal System，EGS）勘探方法项目正通过整合地球科学数据，开发适用于EGS的勘探方案。
本项目选取美国内华达州迪克西谷地热系统作为方法校准的野外实验室场址，原因在于该区域在公开数据领域中属于北美盆岭省（Basin and Range）内特征刻画最为充分的地热系统，已积累了大量地球科学数据，且最为关键的是拥有海量钻井资料。
本基线概念模型报告总结了项目前三项任务的成果：(1) 收集并评估现有公开地球科学数据；(2) 设计并搭建地理信息系统（Geographic Information System，GIS）数据库；(3) 构建基于现有数据的地热基线概念模型，评估地统计关联关系，并针对校准区域（迪克西谷地热井场区）生成从海拔+1千米至海拔-4千米的耦合型EGS有利性/可信度基线图，以在5千米×5千米的尺度上识别EGS钻井靶点。
报告涵盖以下五部分内容：(1) 对可获取的公开领域数据及泰拉根电力有限责任公司（Terra-Gen Power, LLC）提供的部分专有数据的评估；(2) 根据需求对上述数据开展重新解译；(3) 探索性地统计数据分析；(4) 地热基线概念模型；(5) EGS有利性/可信度制图。
本次提出的概念模型适用于迪克西谷区域内的热液系统与EGS。