Well Logging Research for the Department of Energy Geopressured-Geothermal Project

Abstract

Our logging this past year has concentrated on two areas of interest: the effect of boron in reservoir rocks, and analysis of logs of the #1 Hulin Well, South Louisiana. The effect of trace amounts (10-100 ppm) of boron in the reservoir rock or in near well bore completion materials can be significant, since porosity estimates from various neutron logs will be too high if boron is present. Our studies have shown that boron is present in amounts to give concern in several formations and oil field cement formulations. The effect may be several in some geothermal reservoirs. State of the art analysis of well logs in the deep, hot Hulin well in South Louisiana indicates that residual gas saturation occurs throughout a sand which is several hundred fee thick; this is unexpected unless the accumulation is geologically recent. Effect of diffusion of gas on produced gas/water ratio will be discussed.