Abstract
ABSTRACT In reservoirs with low or varying salinity formation waters traditional methods of identifying and quantifying hydrocarbon saturation with resistivity measurements can be very difficult and inaccurate. The Electromagnetic Propagation Tool (EPT*) responds to the dielectric constant of the formation which leads to an alternative method for differentiating between water and hydrocarbon zones which does not depend upon salinity. For the recent eight well exploration program in Block 16 of the Oriente basin in Ecuador, the conditions were expected and found to be those where the EPT would help greatly with formation evaluation for wellsite decisions and also for analysis of residual hydrocarbons. In this paper a brief description is given first of the principle of measurement, tool design, interpretation methods and general applications of the EPT. A discussion of the geological background to the exploration program then follows, and finally the results obtained in two representative wells are presented and explained in detail.
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