The highly layered nature and complex lithology of many fields make formation itnerpretation difficult, especialy for evaluating permeability and fluid mobility with logs. The problem is compounded when log interpretation is based on logging measurements that investigate different volumes of rock. The introduction of new tools that measure co-locational rock volumes such as nuclear magnetic resonance, dielectric propagation time and attenuation, microresistivity, litho-density and epithermal pulsed neutron improves log interpretation significantly. This paper reviews and interpretation methodology that associates these measurements with R_t logs and shows how they can be used in siliclastic formations of complex lithology to provide more accurate determinations of permeability index, silt volume, water-cut prediction, and fluid mobility and volumes. The accuarcy of the results, however, depends on a close relationship between the measuremtns.
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