Carbonate Logging Correction and S-wave Velocity Prediction Method Based on Petrophysics

Abstract

The invention discloses a rock physics-based method for carbonate rock logging correction and shear wave velocity prediction, including establishing a density regression relationship model, obtaining a corrected density curve of logging data; using the rock physics model to reconstruct the model density, longitudinal wave Velocity and shear wave velocity curves, determine the qualified model compressional wave velocity and shear wave velocity curves; according to the fitting relationship between the density of the core test data and the compressional wave velocity, obtain the fitted compressional wave velocity curve, according to the fitting of the core test data compressional wave velocity and shear wave velocity According to the fitted P-wave velocity curve and the qualified model P-wave velocity curve, determine the P-wave velocity curve corrected by the logging data, and according to the fitted S-wave velocity curve and the qualified model S-wave velocity curve Perform analysis to determine the corrected shear wave velocity curve of the logging data; obtain the corrected model shear wave velocity based on cross analysis of the qualified model shear wave velocity and the fitted shear wave velocity value.

Description

technical field [0001] The invention relates to a rock physics-based method for carbonate log correction and shear wave velocity prediction, which belongs to the field of rock physics research. Background technique [0002] The quality of logging data in oil and gas exploration is very important to the whole oil and gas exploration and development. However, because the actual logging data will be affected by the environment, man-made, instruments, etc., there are many uncertain factors in the logging data, which may easily cause errors in well-seismic calibration and seismic interpretation. At the same time, because shear waves are difficult to obtain in actual drilling, it is very important to obtain high-quality logging data. [0003] The existing common logging data correction methods are mostly based on empirical relations, such as the Raymer formula (Raymer et al. 1980), or based on the fitting of various logging data, using the fitting formula to correct other unreaso...

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Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a rock physics-based carbonate rock logging correction and shear wave velocity prediction method, which has high prediction accuracy and can solve the phenomenon that the rock physical law of the original logging data is not clear or wrong , and the lack of logging shear wave velocity, it can provide high-quality logging data for well seismic calibration and reservoir prediction

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