Fluorescent nanocrystals are promising candidates for a range of applications, ranging from biomedical imaging and sensing to solar energy conversion and lighting. Recently, these nanometer-sized semiconductor crystals (also referred to as “quantum dots”) have shown potential to be used as novel geothermal reservoir tracer particles. Quantum dots have size-dependent, tunable electronic and opti...

Reservoir simulation studies are continuously demanded for the Mexican geothermal fields, in places such as, Cerro Prieto, Los Azufres, Los Humeros, etc. Over the last ten years, TETRAD code has been intensively used in Mexico as the main tool for numerical simulation. In order to overcome problems and limitations with the use of GridView, SimView and Fplot the graphic DOS based software f...

Re-injection of produced geothermal water for pressure support is a common practice in geothermal field management. The location selection of the reinjection well and the rate of injection is a challenging subject for geothermal reservoir engineers. The goal of optimization for this type of problem is usually to find one or more combinations of geothermal re-injection well locations that will m...

a detailed study of the exploited geothermal field of travale in italy was conducted using magnetotelluric (mt) data in 2004. this paper detects the main features of the conductivity structures of this area. for subsurface mapping purpose, the long period natural-field mt method proved very useful. for processing and modeling of the mt data, 2d inversion schemes were used and to have the best p...

Density distribution within the Salton Sea geothermal system, of fluids ranging from 20°C to 325X, has been computed using chemical and thermal data from geothermal production well tests and curve-fit models of Na-Ca-K chloride solution properties. Density corrections can easily be made to iO.01 g/cm3 for solute effects of each of the dominant chloride salts as well as pressure above vapor satu...

Editorial Topic 4 of the Renewable Energy Program of the Helmholtz Association focusses inter alia on the sustainable and cost-efficient use of geothermal reservoirs for base-load supply of heat and electricity by EGS. Current EGS projects show the limitations of such systems. Firstly, the localization of a potential reservoir prior to drilling still remains a major challenge. Secondly, the min...

An important aspect of geothermal resource assessment methodology is the development of geothermal resource models consistent with the production histories of exploited geothermal fields. The primary method applied in past United States Geological Survey (USGS) assessments was the volume method, in which the recoverable heat is estimated from the thermal energy available in a reservoir of unifo...

Heat extraction from the Ogachi geothermal resource has been carried out in four test periods following creation of the two-layered stimulated HDR reservoir at depths of about 720 and 1000 m. The tests consist of a 20-day hydraulic communication test in 1993, a ISl-day circulation test in 1994, a 3O-day test in 1995, and lodays of production in the summer testing of 1997. The heat extracted fro...

The ultimate goal of geochemical studies of geothermal systems is to understand the physical-chemical processes responsible for their origin and evolution. The chemical composition of fluids (separated vapor and water), collected from fumaroles, hot springs and drilled wells at the Earth’s surface (25oC) is determined in the laboratory. Using the chemical geothermometers, conservation of mass, ...

Major volcano flank collapses strongly affect the underlying magmatic plumbing system. Here, we consider the magma storage zone as a liquid pocket embedded in an elastic medium, and we perform numerical simulations in two-dimensional axisymmetric geometry as well as in three dimensions in order to evaluate the consequences of a major collapse event. We quantify the pressure decrease induced wit...