Abstract:
Simulation of tracer migration is most commonly carried out using either a 1- dimensional or 2-dimensional model. The majority of the interpretations made so far of wellmatched tracer returns using this method have been generally qualitative – rapid injection returns would most likely result to significant cooling of the productive resource. Some complicated 1D and 2D models have been developed trying to reproduce in the model the likely structures of the flow conduit. But the representation is limited to single layer geometry, which assumes that the flow connection between the wells is at the same depth. This, however, is not the actual case as the productive zones are located at different depths of the reservoir. A more comprehensive, qualitative and quantitative, analysis of tracer returns can be made by using this information to constrain a full 3D model. The success of the simulation is measured by getting the right tracer arrival time, the peak concentration, the shape of tracer curve and the tail-end. An acceptably calibrated model will give a more realistic field-wide interrelationship between faults and the lithologic boundaries and will show the highly permeable structures that control the transport of fluid. In the present study the results from the latest multi production/multi injection tracer testing conducted in Palinpinon I of the Southern Negros Geothermal Field, Philippines are used to simulate tracer transport using a 3D dual porosity model. Only a small section of the field is considered for this study. Also, only the tracer returns from the top four wells of one of the three test results are used in the simulation.
