Laboratory NMR Studies Of Unconventional Rocks Of 'LUKOIL-Western Siberia' Oil Fields

摘要

This paper presents the results of NMR studies of structure of void space of rock of complicated fields with hard reserves. Objects of study - "fritillary", "weathering crust", "bazhenite". These rocks are difficult for studying by conventional methods due to their high heterogeneity, low porosity and permeability, due to presence of large amounts of clays. Therefore we have used NMR relaxometer for study the structure of void space of such rocks. Total by NMR relaxometer were studied more than 200 samples of the three types of rocks, were made more than 500 NMR measurements 100% saturated and of dry samples. For a detailed study of the structure of the pore space was used the method of nuclear magnetic resonance (NMR), because the standard capillary methods (method of semipermeable membranes and of centrifugation) do not reveals the characteristic features of the structure of the void space which are inherent for these rocks. By using standard researches in principle not possible to determine the pore size and pore channels of less than 0.1 microns, and by these methods is impossible to study the so called "clay bound water" as a component in the distribution of fluids in the rock. In addition, the NMR method is more accurate and non-destructive method for studying the structure of the pore space of rocks. For the same samples, parallel of the NMR studies, were carried out routine investigations of reservoir properties, and more detailed lithological studies using a scanning electron microscope and gas chromatograph.