A Curve Correction Method Based on Petrophysical Meaning

Abstract

The invention discloses a method for correcting curves based on the meaning of rock physics, which includes: establishing a rock physics model based on actual test data; obtaining the intersection template of the initial compressional wave velocity and density curve through forward modeling, and obtaining the compressional wave velocity that needs to be corrected by judging the borehole diameter curve and density curve; divide the curve to be corrected into multiple time window segments; set a correction coefficient, use the weighted average Raymer petrophysical correction method and empirical formula method to correct the curves in multiple time window segments respectively, and obtain Variable coefficient weighted correction results; for the variable coefficient weighted correction results, the well-seismic correlation coefficient is used as the basis, and the convergence of abnormal points is used to judge whether the correction result is reasonable; when the well-seismic correlation coefficient is lower than the set threshold, or abnormal If the point does not converge, correct the correction coefficient and recalculate the variable coefficient weighted correction result; when the well-seismic correlation coefficient is equal to or higher than the set threshold and the abnormal point converges, the correction result is reasonable, and the corrected curve is output.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a curve correction method based on petrophysical significance. Background technique [0002] In the process of seismic interpretation and reservoir prediction of oil exploration, high-quality acoustic time difference and density logging curves are needed to make high-precision synthetic seismic records or establish relatively accurate low-frequency models. However, in many cases, the actual acoustic time difference and density logging curves are seriously distorted, which affects the accuracy of well-seismic calibration and inversion. In particular, the shallow detection logging series (sonic wave, density, etc.) are easily affected by the wellbore environment, and diameter expansion has a greater impact on the quality of the logging curve, which easily distorts the logging data. Based on these problems, a reasonable curve correction method is especially needed t...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that a single curve correction method is difficult to meet the requirements and the correction error is relatively large, the present invention provides a comprehensive curve correction method in the sense of rock physics to improve the accuracy and stability of curve correction

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