Carbonatite logging correction method based on rock physics and carbonatite shear wave velocity prediction method based on rock physics

Abstract

The invention discloses a carbonatite logging correction method based on rock physics, and a carbonatite shear wave velocity prediction method based on rock physics. The carbonatite logging correctionmethod comprises the steps of establishing a density regression relationship model, and obtaining a density curve after logging data are corrected; reconstructing model density, longitudinal wave velocity and shear wave velocity curves by using a rock physics model, and determining qualified model longitudinal wave velocity and shear wave velocity curves; obtaining a fitted longitudinal wave velocity curve according to a fitting relationship between core test data including density and the longitudinal wave velocity, and obtaining a fitted shear wave velocity curve according to the fitting relationship between the core test data including the longitudinal wave velocity and the shear wave velocity; determining a longitudinal wave velocity curve after the logging data are corrected according to the fitted longitudinal wave velocity curve and the qualified model longitudinal wave velocity curve, and performing analysis according to the fitted shear wave velocity curve and the qualified model shear wave velocity curve to determine a shear wave velocity curve after the logging data are corrected;and performing intersection analysis according to the qualified model shear wave velocity and a fitted shear wave velocity value to obtain a corrected carbonatite model shear wave velocity.

Description

technical field [0001] The invention relates to a rock physics-based carbonate logging correction and shear wave velocity prediction method, 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 many aspects such as the environment, man-made, and instruments, 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, since 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 corr...

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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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