Applications of 'Down-Well/Down-Well' and 'Down-Well/Surface' ResistivityTechniques to Evaluate Ground Water Flow in Fractures

摘要

Many exploratory and geophysical techniques exist for examining bedrock hydrologyincluding surficial methods and bore-hole techniques. The technique of cross-well conductivity may be used to enhance other investigatory methods as well as to provide additional, possibly crucial, information for characterization of bedrock hydrology. The cross-well conductivity technique involves applying a low frequency alternating current to electrodes suspended within two bedrock wells and measuring resulting voltage between electrodes or between one of the electrodes and other wells. The theoretical development presented examines how data may be interpreted and what factors influence the data. Also, theoretical development examines how hydrological data may be used in conjunction with electrical data to provide further information on bedrock properties. Laboratory and field studies tested practical application of the theory. In the laboratory, fracture model aperturestory measured with the cross-well conductivity technique reasonably matched those measured hydrologically.