Analysis of Well-Tests in Balcova-Narlidere Geothermal Field, Turkey

Abstract

In this work, analyses of two injection/falloff and two pressure drawdown tests in the Balcova-Narlidere geothermal field, Turkey, are presented. The pressure data are analyzed by using modern well-test analysis techniques, such as pressure derivative to identify flow regimes exhibited by the data and regression analysis to estimate formation parameters. The pressure tests conducted, in general, show that the tested wells produce from a "reservoir" with a complex network of system consisting of communicating and noncommunicating fractures/faults. For example, the pressure-derivative behavior of the wells BD-2, BD-5 and BD-7 resembles the behavior of a well located near a high-conductivity communicating fault zone, while the pressure-derivative behavior of the BD-6 well indicates that the well is located near a sealing (non-communicating) fault zone. The estimated values of flow capacities (kh) from the analyses of well-test pressure data for these four wells changed from 3 to 121 darcy-m.