Gravimetric and morpho-structural analyses in the superhot geothermal system Los Humeros: an example from central Mexico

IF 2.9 2区 地球科学 Q3 ENERGY & FUELS
Natalia Cornejo-Triviño, Domenico Liotta, Luigi Piccardi, Andrea Brogi, Michal Kruszewski, M.A Perez-Flores, Jonathan Carrillo, Philippe Calcagno, Ingo Sass, Eva Schill
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Abstract

The influence of deep and regional geological structures is becoming increasingly important in superhot geothermal systems due to their proximity to the transition between brittleness and ductility. In the Los Humeros geothermal field in Mexico, where subsurface fluids reach temperatures of over 350 °C, the surface structures resulting from the collapse of calderas have so far only been interpreted at the local scale. The aim of this work is to place the recent tectonic and volcano-tectonic geomorphologic evolution and structures in the Los Humeros volcanic area in a regional context. NE- and NW-striking dominant structures resulting from a morpho-structural analysis on a regional scale are confirmed by negative and positive anomalies, respectively, after Butterworth filtering of gravity field data with different wavelengths over a local area of about 1000 km2. By analyzing the slip and dilation trends of the observed directions, we show the relevance of the regional context for reservoir exploration. The magnitudes of the principal stresses we estimate indicate a trans-tensional fault regime, a combination of strike-slip and normal faulting. The structures derived from the gravity and morpho-structural analyses, which are parallel to the maximum horizontal stress, have the highest potential for tensile and shear failure. Therefore, the corresponding negative gravity anomalies could be related to fracture porosity. Consequently, we hypothesize that these structures near the transition between brittleness and ductility control fluid flow in the Los Humeros geothermal field.

超热地热系统 Los Humeros 的重力和形态结构分析:墨西哥中部的一个实例
在超热地热系统中,深层和区域地质结构的影响正变得越来越重要,因为它们接近脆性和延展性之间的过渡。在墨西哥的洛斯胡默罗斯地热田,地下流体的温度超过 350 °C,但迄今为止,因火山口坍塌而产生的地表结构仅在局部范围内得到解释。这项工作的目的是将洛斯胡莫洛斯火山地区近期的构造和火山构造地貌演变和结构置于区域背景下进行研究。在对当地约 1000 平方公里范围内不同波长的重力场数据进行巴特沃斯滤波后,通过区域尺度的形态结构分析得出的东北向和西北向主导结构分别通过负异常和正异常得到了证实。通过分析观测方向的滑移和扩张趋势,我们展示了区域背景与储层勘探的相关性。我们估算的主应力大小表明了一种跨张性断层机制,即走向滑动和正断层的结合。重力和形态结构分析得出的结构与最大水平应力平行,具有最大的拉伸和剪切破坏潜力。因此,相应的负重力异常可能与断裂孔隙度有关。因此,我们推测,这些接近脆性和延展性之间过渡的结构控制着洛斯赫默罗斯地热田的流体流动。
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来源期刊
Geothermal Energy
Geothermal Energy Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
5.90
自引率
7.10%
发文量
25
审稿时长
8 weeks
期刊介绍: Geothermal Energy is a peer-reviewed fully open access journal published under the SpringerOpen brand. It focuses on fundamental and applied research needed to deploy technologies for developing and integrating geothermal energy as one key element in the future energy portfolio. Contributions include geological, geophysical, and geochemical studies; exploration of geothermal fields; reservoir characterization and modeling; development of productivity-enhancing methods; and approaches to achieve robust and economic plant operation. Geothermal Energy serves to examine the interaction of individual system components while taking the whole process into account, from the development of the reservoir to the economic provision of geothermal energy.
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