T Abstract Geothermal reservoirs commonly exist in hydrothermal convection systems involving fluid circulation downward in areas of recharge and upwards in areas of discharge. Because such reservoirs are not isolated from their surroundings, the nature of thermal and hydrologic connections with the rest of the system may have significant effects on the natural state of the reservoir and on its ...

An “EKP-postprocessor” computational tool was developed several years ago to calculate space/time distributions of electrokinetic potentials resulting from histories of underground conditions (pressure, temperature, liquid-phase saturation, concentration of dissolved species, etc.) computed by unsteady multidimensional geothermal reservoir simulations (Ishido and Pritchett, 1996). Since that ti...

An easy-to-use modeling environment for numerical geothermal reservoir has been developed for TOUGH2 simulator. It consists of pre-processors to prepare text-based input data, post-processors to visualize simulation result, and databases to store observations and information related to wells. These software have interactive graphical user interfaces for easy operation to develop numerical geoth...

Pursuit and use of geothermal energy in the Netherlands is developing steadily. However, in order to make sound decisions, investors and insurers are requesting the probability of success of each planned geothermal project. A methodological appraisal system was developed in order to achieve a meaningful probability of success of the expected flow rate and thermal capacity. The appraisal system ...

Background The most essential requirements for a geothermal reservoir are sufficient temperature and permeability (e.g. Jung et al. 2002; Paschen et al. 2003; Schulz 2011; Schulz et al. 2009). Whereas the geothermal gradient for a given region is commonly constrained to a sufficient degree, estimates of porosities, fracture systems, permeabilities, and therefore the achievable convective heat f...

Estimates for the pressure decline in high TDS geothermal fluids containing dissolved gases are extremely sensitive to the PVT representation of the reservoir fluid. Significant errors in predicted pressures will occur if the geothermal fluid is represented by one or two pseudo components with modified water properties. As a result, we have developed a PVT model to predict the thermodynamic pro...

The deliverability of liquid-dominated geothermal reservoirs is presented in terms of reservoir performance, and wellbore performance. Water influx modeling is used to match the performance of Wairakei in New Zealand, arid Ahuachapan in El Salvador. The inflow performance is given in terms of a linear productivity index for liquid-only flow, and a solution-gas drive relationship for two-phase f...

Panax Geothermal Limited is developing a geothermal resource in South Australia, the Limestone Coast Project, which is a conventional “hot aquifer” reservoir in a deep sedimentary basin. The initial development is the Pretty Hill Formation sandstones in the Penola Trough of the Otway Basin. The area is an exploited gas basin with modern 3D seismic and excellent existing petroleum well data cove...

A computer program in Visual Basic 6.0 is written to calculate steam tables for pure water up to 800oC and 1400 bar. The steam tables are created as a DLL (Dynamic Link Library) object with properties: temperature, pressure, specific volume, enthalpy and entropy for liquid and vapor phases, and liquidvapor state. The steam tables can be incorporated in any computer program on the Windows platfo...

Ground deformation contains important information that can be exploited to look into the dynamics of a geothermal system. In recent years, InSAR has manifested its strong power in the monitoring of ground deformation. In this paper, a multi-temporal InSAR algorithm, WLS InSAR, is employed to monitor and characterize the Yangbajing geothermal field in Tibet, China, using 51 ENVISAT/ASAR images a...