当前位置: X-MOL 学术Geotherm. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Petrophysical characterization of the Los Humeros geothermal field (Mexico): from outcrop to parametrization of a 3D geological model
Geothermal Energy ( IF 4.2 ) Pub Date : 2022-03-21 , DOI: 10.1186/s40517-022-00212-8
Weydt, Leandra M., Bär, Kristian, Sass, Ingo

The Los Humeros Volcanic Complex has been characterized as a suitable target for developing a super-hot geothermal system (> 350 °C). For the interpretation of geophysical data, the development and parametrization of numerical geological models, an extensive outcrop analogue study was performed to characterize all relevant key units from the basement to the cap rock regarding their petrophysical properties, mineralogy, and geochemistry. In total, 226 samples were collected and analyzed for petrophysical and thermophysical properties as well as sonic wave velocities and magnetic susceptibility. An extensive rock property database was created and more than 20 lithostratigraphic units and subunits with distinct properties were defined. Thereby, the basement rocks feature low matrix porosities (< 5%) and permeabilities (< 10–17 m2), but high thermal conductivities (2–5 W m−1 K−1) and diffusivities (≤ 4·10–6 m2s−1) as well as high sonic wave velocities (≥ 5800 m s−1). Basaltic to dacitic lavas feature matrix porosities and permeabilities in the range of < 2–30% and 10–18–10–14 m2, respectively, as well as intermediate to low thermal properties and sonic wave velocities. The pyroclastic rocks show the highest variability with respect to bulk density, matrix porosity (~ 4– > 60%) and permeability (10–18–10–13 m2), but feature overall very low thermal conductivities (< 0.5 W m−1 K−1) and sonic wave velocities (~ 1500–2400 m s−1). Specific heat capacity shows comparatively small variations throughout the dataset (~ 700–880 J kg−1 K−1), while magnetic susceptibility varies over more than four orders of magnitude showing formation-related trends (10–6–10–1 SI). By applying empirical correction functions, this study provides a full physiochemical characterization of the Los Humeros geothermal field and improves the understanding of the hydraulic and thermomechanical behavior of target formations in super-hot geothermal systems related to volcanic settings, the relationships between different rock properties, and their probability, whose understanding is crucial for the parametrization of 3D geological models.

中文翻译:

Los Humeros 地热田(墨西哥)的岩石物理特征:从露头到 3D 地质模型的参数化

Los Humeros 火山复合体被认为是开发超热地热系统 (> 350 °C) 的合适目标。对于地球物理数据的解释、数值地质模型的开发和参数化,进行了广泛的露头模拟研究,以表征从基底到盖层的所有相关关键单元的岩石物理特性、矿物学和地球化学。总共收集并分析了 226 个样品的岩石物理和热物理特性以及声波速度和磁化率。创建了一个广泛的岩石属性数据库,并定义了 20 多个具有不同属性的岩石地层单元和亚单元。因此,基底岩石具有低基质孔隙度(< 5%)和渗透率(< 10-17 m2),但高热导率 (2-5 W m-1 K-1) 和扩散率 (≤ 4·10-6 m2s-1) 以及高声波速度 (≥ 5800 m s-1)。玄武质到英安岩熔岩的基质孔隙度和渗透率分别在 < 2-30% 和 10-18-10-14 m2 范围内,以及中低热特性和声波速度。火山碎屑岩在体积密度、基质孔隙度(~ 4- > 60%)和渗透率(10-18-10-13 m2)方面表现出最高的可变性,但总体上具有非常低的热导率(< 0.5 W m-1 K-1) 和声波速度 (~ 1500–2400 ms-1)。比热容在整个数据集中显示出相对较小的变化(~ 700-880 J kg-1 K-1),而磁化率变化超过四个数量级,显示出与地层相关的趋势(10-6-10-1 SI) .
更新日期:2022-03-21
down
wechat
bug