Method for estimating velocity of transverse waves based on inversion of equivalent elastic modulus for self-adapting matrix minerals
A technology of shear wave velocity and self-adaptation, which is applied in the fields of seismology and seismic signal processing for well logging records. It can solve the problems of large elastic modulus value variation range, high cost, and difficult setting, and achieve high calculation accuracy. , reduce multi-solution, and reduce the number of effects
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[0017] The shear wave velocity estimation method based on the inversion of the equivalent elastic modulus of adaptive matrix minerals, the specific implementation steps are as follows:
[0018] (1) Taking a single logging depth point as the research object, according to the logging data (P-wave velocity, density and porosity) at that depth point, the empirical relationship between the longitudinal wave velocity and the shear wave velocity of sand and mudstone is used (Castagna, 1993) to estimate Initial shear wave velocity, and calculate the range, initial value and increment of the Poisson’s ratio of the dry rock and the equivalent bulk modulus of the matrix mineral at the logging depth point.
[0019] The empirical relationship between longitudinal wave velocity and shear wave velocity of sand and mudstone (Castagna, 1993) is shown in formula 1.
[0020] V s = 0.804V p -0.856 (1)
[0021] Where V p Represents longitudinal wave velocity, V s Represents transverse wave velocity.
[0022]
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