Patent ID: 6954402
Filing Date: 2005-10-11
Classification: G01V

Abstract:
1. A method of wave diagnostics of the oil-and-gas deposit which includes the excitation of the seismic waves by the near-surface sources of the oscillations, the recording of displacement vectors for the direct longitudinal and shear waves for the each observation point by means of the three-component seismic profiling along the depth of the investigated borehole and the processing of their kinematic and dynamical parameters, characterised in that one near-surface source of the oscillations executes in the vicinity of the borehole the longitudinal wave excitation, and their reception is carried out simultaneously in the investigated and check boreholes; after orientation in space of three-component observations data the monotype time signals for the compression and shear constituents of the direct longitudinal wave are extracted out of the seismic wavelets which were registered on the axial and tangential components of the displacement vector by the borehole and check devices respectively; further by means of processing the kinematic parameters of the direct longitudinal and shear waves calculate interval values of longitudinal and shear modules of the elasticity; after the decoding of the monotype time signals quantitative estimates of their significant dynamical parameters are defined for the borehole and check data, and respectively for the each observation point and constituent of the direct longitudinal wave, moreover the accuracy of the obtained estimates of the dynamical parameters is monitored by means of the computer modelling of the seismic signals; then, carrying out the correction of the corresponding parameter because of the changes of the wave excitation conditions during multiple excitation of the oscillations and the filtration of the seismic signals in the covering thickness of the rocks, defines the dynamical parameters of the impulse responses, values of the coefficients of volumetric and shear dynamical viscosity and absorption for the compression and shear constituents of the layers, when the calibrated values of the absorption coefficients for the compression constituent are used the in the capacity of the indicator for the presence estimates and the fluid-type identification, filling the pore and fissure volume in the rocks, and also values of the bedded coefficients of the effective attenuation, attenuation and energy dispersion of longitudinal wave are calculated; then the obtained petrophysical data are converted into bedded values of the parameters of the reservoir and fluid-saturated properties of the layers with the aim of the necessary totality receipt of significant oil-field parameters for the identification of the oil-and-gas deposit image.