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PROCEEDINGS, Thirty-Sixth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, January 31 - February 2, 2011 SGP-TR-191 A CONCEPTUAL MODEL FOR GEOTHERMAL ENERGY INVESTIGATION WITH EMPHASIS ON THE CARIBBEAN ABSTRACT Some of the Caribbean islands have great potential for Geothermal Energy. These islands have been formed partially by the subduction of the Atlantic Crustal plate beneath the Caribbean plate, forming volcanic island chains. The North-Eastern islands are older, extinct volcanoes while the Western arc contains younger more active volcanoes. These give rise to volcanic eruptions resulting in geothermal activity, lending huge potential for geothermal energy. The only operating geothermal plant in the Caribbean is at Bouillante in Guadeloupe with a 15 MW capacity. The island Governments of Dominica and Nevis have initiated exploration work for geothermal energy. Nevis has a potential of 700 MW and the Government is in the process of setting up a geothermal power plant to develop 24 MW of energy for domestic use as well as to sell to neighboring islands. Geophysical surveys, resistivity and seismic, are being investigated to identify fault lines, thus enhancing the possibility of identification of hydrothermal systems. The use of shear-wave splitting (SWS) as a tool for identifying fractured reservoirs is also being investigated. A conceptual model is being developed with the view of better enabling the investigation of hydrothermal systems. This model would be able to describe the fractured density and orientation of the reservoir. INTRODUCTION Geothermal energy is present beneath the Earth’s surface with the most desirable, high temperature sources being concentrated in regions of active or geologically young volcanoes. This is the situation with the younger more active Western arc of the volcanic islands of the Eastern Caribbean chain as shown in Figure 1. Figure 1: Interaction of North American and Caribbean plates. (Source: Seismic Research Centre, The University of the West Indies.) Developments are being made to exploit these resources in the Caribbean. In particular, exploratory work is being undertaken in the islands of Nevis, Dominica and Saba to develop their geothermal resources for commercial use. This paper focuses on the island of Nevis. The objective of this paper is to theoretically and mathematically develop a conceptual representation of the fractured zones and the relevant physical processes occurring within them. The geothermal investigations are presented specifically with respect to fluid flow and how it behaves in porous boundaries. Hence the fluid flow and transport processes within the reservoir are conceptually modeled to better understand these hydrothermal *Indra Haraksingh ** Randy Koon Koon Department of Physics The University of the West Indies Trinidad *iharaksingh@yahoo.com **randykoonkoon88@hotmail.comPDF Image | CONCEPTUAL MODEL FOR GEOTHERMAL ENERGY CARIBBEAN
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