Abstract
On the basis of the effort by the Delft University of Technology to produce hot water for heating purposes (Delft Geothermal Project, DAP), the Buntsandstein Reservoirs of the Triassic Detfurth and Volpriehausen Formations in the West Netherlands Basin have been identified and delineated for geothermal energy development. The objective was to identify the quality and indicate the distribution of these geothermal energy reservoirs for the purpose of generating electricity. In the light of this, four seismic surveys are interpreted and integrated with well data, which are analysed and interpreted for stratigraphic and structural frameworks, followed by analysis of petrophysical properties. Two porosity/permeability relationships are used for calculating net-to-gross (N/G) at
various permeability cut-offs such as 0.1mD, 1mD, 10mD and 100mD. Net sand ranges from 0.14m to 58.04m for 10mD and 0.1mD permeability cut-offs respectively. Based on different scenarios the average porosity ranges from 6.5% to 16.2% and N/G ranges from 0.6% to 30.8%. Heterogeneity remains an issue of concern, but it is believed that they will generally not serve as a barrier or baffle to flow. The zone in and around Wells MON-03, P18-A-02, P15-01 and P1514 in the central part of the study area show the best reservoir intervals based on average porosity
and N/G values. This zone is therefore recommended as the most plausible for the geothermal energy development project, it is also characterized with depths in the excess of 3,000m and estimated temperatures in excess of 1400C, which are well above the required values for generating electricity.