The Research Of Geological Application Of NMR Logging Data In SN Area

In order to promote the popularization and application of NMR logging technology in SN area,in this actual,by means of a systematic analysis of NMR data of core samples,in-depth analysis and summary of the correlation and similarity of the saturated T₂ spectra and the centrifugal T₂ spectra,calibrating the T₂ spectral integral curve of logging data by means of the pressure data of mercury capillary pressure,determining the parameters of reservoir classification by using the data of core experiment analysis,NMR logging and conventional logging data,a set of relative perfect morphological method to determine the cutoff value of T₂,the calibration method of T₂ spectrum and mercury injection capillary pressure curve and the method of reservoir classification using NMR experimental data is established.Based on the analysis of the experimental data,a new method is proposed to classify the T₂ spectra and determine the T₂ cutoff value according to the T₂ spectral features of NMR logging,and a new method for automatic determination of cutoff value of T₂ is presented.This actual clearly pointed out the nonlinear relationship between the capillary pressure curve and the T₂ integral curve of NMR logging,developed the traditional single linear coefficient calibration method,established a practical method and technique for quantitative calibration of T₂ spectra of NMR logging.According to the reservoir parameters calculated by NMR logging data,the reservoir can be divided into four types: medium and high porosity,medium and high permeability,low porosity and low permeability and extra low porosity and extra low permeability.The scale model of each type of reservoir is established to realize the conversion of the capillary pressure curve and the quantitative calculation of pore size distribution spectrum.This actual used the NMR logging data to calculate the macro and micro parameters of reservoir,and further classify the reservoir characteristics of different types of reservoirs,at the same time,the macro and micro characteristics of each reservoir are characterized.Practice shows that the establishment of the NMR based integrated evaluation method of well logging and reservoir classification and technical index system can be applied to the target area,and can be further applied to reservoir evaluation in Junggar basin oil and gas exploration and development.