Abstract
Abstract Successful petrophysical interpretation of NMR logs depends greatly on the selection of acquisition parameters and data processing methods. Routine tool calibration, based on a single fluid, guarantees the accuracy of porosity; however, the tool response to individual 72-components in a multiple fluid-component system is not directly assessed. The MRIL® response to multiple fluids was tested in a multi-fluid calibrator. A series of tests were performed in various logging modes, including standard T2, bound water logging, and dual wait time logging sequences. This investigation provides the basis for a more effective utilization of the MRIL tool with more appropriate acquisition parameters and data processing methods for the petrophysical interpretation of reservoir formation and fluid systems that exhibit bimodal T2 distributions. For a given bimodal T2 distribution, the ability to detect bimodality depends on (1) the relative magnitudes of the two peaks, (2) the echo-train record length L, (3) the number of echoes N, (4) the data processing method including the proper bin range selection, and (5) noise. Based on the investigation, we discussed our recommendations for selecting acquisition sequences, parameters, and data processing methods.
Published Version
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