ELECTROMAGNETIC PROPAGATION LOGGING: PROPAGATION LOGGING: ADVANCES IN TECHNIQUE AND INTERPRETATION
Abstract
The Electromagnetic propagation Tool (EPT*) is a downhole microwave instrumentation device which channels 1.1 GHz energy into the formation and measures the travel time and attenuation of the microwave signal as it propagates through the invaded zone. The relevant electromagnetic field theory, the basic measurement technique, and the tool block diagram are reviewed. The present interpretation techniques are then discussed, followed by several log examples which show the utility of the EPT. Specifically, the EPT-derived porosity, when compared with neutron/density porosity, porosity, when compared with neutron/density porosity, allows one to distinguish between hydrocarbon-bearing and water-bearing zones in formations having varying lithologies and water salinities.
The basic theory upon which the microwave Electromagnetic Propagation Tool (EPT) has been founded is reviewed, and the measurement technique is discussed in terms of a functional block diagram. Two methods of interpreting the propagating wave's measured phase and attenuation are reviewed. Specific log examples which distinguish between hydrocarbon and water-bearing zones in several lithologies are presented..
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