NUCLEAR MAGNETIC RESONANCE MEASUREMENTS ON CARBONATE ROCK SAMPLES TO ASSESS THEIR PROPERTIES AS RESERVOIRS
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Abstract
The nuclear magnetic resonance (NMR) tools measure the Porosity without the influence of the lithology, and also they allow evaluate the Permeability. The property interpretation of NMR logging in wells goes through the NMR measurements in core samples. There are many factors in those measurements. The main objective of these report is evaluated the interpretation of the NMR measurements in carbonate samples. The specific objective: Analysis of the results NMR measurements of core samples; Reinterpretation of results; Validation results of calculates permeability with the results of measurement permeability of those samples. For this investigation we use the NMR measurements in core samples and the other core determinations. Limestone characteristics: the average is 80ms, (50 to 120ms) when it contains holes that increase T2 to 750ms and more. In order to obtain a relation between the porosity and permeability is necessary establish this relation between the measurement permeability in core samples and the porosity as result to eliminate from measurement total porosity the value of clay porosity, capillaries porosity and no connected porosity using Porogramms and T2 distributions. K calculated values that are the most approach to measurement k values are those obtained with the SDR Modell in the interval E, no in the interval M. The coefficient C=0,1 doesn`t fix to evaluating limestone rock.
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