Calculation Of Reservoir Parameters And Fluid Identification Using MRIL Prime Logging

MRIL-Prime Logging instrument is the most nuclear magnetic resonance logginginstrument imported from abroad in our country. The interpretation software is thesoftware platform of DPP Halliburton. While the foreign processing software islimited in number installed and hardware. The nuclear magnetic resonance loggingdata processing and interpretation application can not fully meet the needs ofproduction and scientific research. Therefore, it is necessary to study the treatment ofMRIL-Prime Logging data interpretation method and the development of a domesticlogging interpretation software platform module based on.In order to solve the problem, this paper discuss MRIL-Prime Logging dataprocessing and major technology based on the basic theory of nuclear magneticresonance and NMR logging technology research at home and abroad.Then the mainmethod are hung in the domestic logging software platformIn the method of calculating spectrum,put forward a kind of new NMR T2spectrum inversion method: Nonnegative Least Squares method of adaptive cutoffvalue. Firstly, establish the inversion objective function. Then, the adaptive cutoffvalue is calculated according to the noise variance. Then, transform objective functionusing the adaptive cutoff value. Finally, nonnegative least squares objective functionis calculated using the active set method solution. The active set method is that it hasa number of operations limited, suitable for the actual needs; nonnegative constraintsand the optimal solution is obtained at the same time. Real data processing proves, theinversion method of T2spectrum is continuous and stable.In calculation of reservoir parameters, we have studies the method of calculatingthe porosity, permeability, and simulate the pseudo capillary pressure curve. Bychanging the permeability model, improve the accuracy of the computed parameters.In Fluid qualitative analysis and quantitative analysis, study the spectral shift andspectral subtraction method,TDA analysis and DIFAN analysis. By processing theactual NMR logging data and comparing with core data, there is better results.