P and S-wave velocity inversions in elastic medium;

This paper, based on the full wave acoustic logging data and density logging data of 48 wells from Daqing, has built up two empirical formulas between density and P-wave velocity (DPV) and between density and S-wave velocity (DSV) relatively.

Precise S-wave logging velocity is necessary parameter for prestack seismic inversion and prestack seismic properties analysis,however S-wave velocity information is always absent in the practical applications.

Using conventional well logging data to calculate the shear wave velocity of gas reservoir;

Based on actual core data,the experimental studies were conducted to investigate the relationships of compressional wave velocity and shear wave velocity(P-wave and S-wave) with porosity and fluid types using sandstone core samples.

As a result, an optimal technique based on the Xu-White model and its workflow was obtained for shear wave velocity predication.

Calculation procedure of shear velocity curve on petrophysics;

And continuous measurements of compressional velocity and shear velocity were made in the course of displacing.

The sonic probe is newly-developed for the measurement of core P- and S-wave velocities, with a unique design that effectively suppresses P-wave disturbance, enhances torsional vibration, greatly increases signal-to-noise ratio and easily determines the location of the first S-wave.