Curve correction method based on rock physics meaning

Abstract

The invention discloses a curve correction method based on rock physics meaning, comprising the following steps: building a rock physics model according to actual test data; carrying out forward modeling to obtain an initial P-wave velocity and density curve intersection template, and making judgment based on the intersection template and a hole diameter curve to get a P-wave velocity and density curve needing calibration; dividing the curve needing calibration into multiple time window periods; setting a calibration coefficient, and using a weighted average Raymer rock physics correction method and an empirical formula method to correct the curve in the multiple time window periods to get a variable-coefficient weighted correction result; judging whether the variable-coefficient weighted correction result is reasonable by using well-seismic correlation coefficient as the basis and referring to the convergence condition of abnormal points; when the well-seismic correlation coefficient is lower than a set threshold or the abnormal points do not converge, correcting the calibration coefficient and recalculating the variable-coefficient weighted correction result; and when the well-seismic correlation coefficient is equal to or higher than the set threshold and the abnormal points converge, determining that the calibration result is reasonable, and outputting the curve after correction.

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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