Reactive tracers have long been considered a possible means of measuring thermal drawdown in a geothermal system before significant cooling occurs at the extraction well. In this study, we examine the sensitivity of successive reactive tracer tests to reservoir cooling. Results indicate that while the sensitivity of the method as generally proposed is low, it may be sufficient to provide valuab...

Three-dimensional compressionaland shear-wave velocity (“Vp” and “Vs,” respectively) structure is obtained for the SE Geysers geothermal area from microearthquake arrival-time data. The results indicate a region of high Vp and high Vs in the northwest portion of the area studied, and a low value of VpNs at depths corresponding to the upper part of the steam reservoir. The Vp and Vs anomalies ar...

In order to improve the accuracy of repeat gravity surveys for reservoir monitoring, it is desirable to perform continuous gravity measurements in addition to the ordinary survey program. We can apply time series analysis to the continuous recording to evaluate the causes of various gravity variations. We have made continuous gravity measurements using a Scintrex CG-3M gravimeter at several geo...

Growth in geothermal power production in the Hengill area of Iceland, and a need for environmental impact studies that look hundreds of years ahead, has resulted in new challenges for numerical model developers. An existing, large-scale, iTOUGH2based 3-D reservoir model of the Hengill volcano has recently been recalibrated and used to study the impact of 400 MWe and 700 MWt cogenerations in two...

A program was designed to allow the study of the effects of several parameters on the injection of water into and production of fluid from a fractured low porosity geothermal reservoir with properties similar to those at The Geysers. Fractures were modeled explicitly with low porosity, high permeability blocks rather than with a dual-porosity formulation to gain insight into the effects of sing...

The implementation of renewable energy sources, and geothermal energy in particular, is becoming increasingly important in Germany. However, geothermal power generation is a high risk, capital intensive technology and its future use will depend on how successfully it can be integrated within the German power grid infrastructure. For this to happen, its inherent operational risks must be reduced...

The Turaszówka crude oil field is situated within the borders of Krosno town. The oil resources are nearly depleted. Many of the boreholes have already been liquidated. Currently, only 22 boreholes are being exploited. Eight of them are watered and exploiting oil along with the reservoir water. The boreholes were submitted for producing the geothermal energy, because of their location. They are...