#SHADOW COMPLEX MAP LEGEND DRIVER#

The project was devoted to investigate superhot resources in Los Humeros and enhanced geothermal systems in Acoculco, both areas located in eastern Mexico. This paper aims at sharing 3D geological models that were constructed at different scales in two Mexican geothermal areas as part of the European-Mexican GEMex project. This review shows that DOM can be found in a variety of geothermal reservoirs and that it could be an additional essential tool to better understand fluid chemistry and reservoir conditions, and to optimize geothermal operation.

#SHADOW COMPLEX MAP LEGEND DRIVER#

Microbial degradation might be the main driver for low DOC concentrations in the lower temperature range (below 80 ◦C ), while thermal degradation likely accounts for the decline in DOC in the temperature region between 80 ☌ and 200 ☌. DOC concentrations were higher in fluids with temperatures above 80 ☌ and showed a decrease towards 200 ☌. The DOC concentrations were found to be generally lower in the fluids with temperatures below 80 ☌. Temperatures range from 34 to 200 ☌, depths from 850 to 5000 m, chloride content from 0.1 to 160 g L−1, and dissolved organic carbon (DOC) concentrations from 0.1 to 30.1 g L−1. The environmental conditions of the sites included varied greatly. This review presents an overview of a total of 143 fluid samples from 22 geothermal sites (mainly central Europe), from the literature and compiling data to address the importance of DOM in geothermal fluids and how it might affect geothermal operation. Its composition might reveal hydraulic connections to organic‑rich strata, giving insights to the fluid flow within the reservoir. Natural DOM as well as artificial DOM (e.g., from chemical scaling inhibitors) might serve as nutrients for microorganisms or affect chemical properties of the fluids by complexation. With well depths reaching a few kilometers, these sites give access to investigate deep subsurface environments. However, the origin, composition and fate of DOM within deep geothermal reservoirs used for energy production is relatively unknown. Dissolved organic matter (DOM) can be found in a variety of deep subsurface environments such as sedimentary basins, oil fields and mines.

Shadow complex map legend