5 results about "Acoustic wave equation" patented technology

The application discloses a kind of stable and efficient seismic wave propagation vector determination method and device, the method includes: first according to finite difference method, the acoustic wave equation is solved to obtain seismic wave field data;Then based on the seismic wave field data, the spatial domain gradient of seismic wave field at a time, the time domain integration of seismic wave field at a time and the spatial domain gradient of the time domain integration of seismic wave field at a time are calculated;Finally, according to the seismic wave field data, the spatial domain gradient of seismic wave field at a time, the time domain integration of seismic wave field at a time and the spatial domain gradient of the time domain integration of seismic wave field at a time, determine the seismic wave propagation vector.Compared with traditional Poynting vector, the oscillation phenomenon existing in traditional Poynting vector is eliminated, and the calculation complexity is relatively low.

This disclosure relates to a method, apparatus, device, storage medium, and computer program for establishing a depth domain velocity model. The method includes: acquiring pre-stack seismic shot gather data for the current region; outputting velocity updates based on the pre-stack seismic shot gather data using a pre-trained initial depth domain velocity model; acquiring updated velocities based on the updated velocities; performing acoustic wave equation forward modeling on the updated velocities according to preset forward modeling parameters to obtain forward modeling records; establishing a L2-norm target loss function based on the forward modeling records and pre-acquired observation records; performing iterative inversion on the initial depth domain velocity model using the L2-norm target loss function; confirming the depth domain velocity model after reaching a preset number of iterations; and performing depth domain velocity analysis using the depth domain velocity model based on seismic data for the target region to obtain velocity data.

This invention relates to the field of seismic data processing and interpretation, and discloses a method, apparatus, equipment, and storage medium for analyzing the elastic effects of seismic waves. The method includes: collecting well logging data from target wells exhibiting well-seismic mismatch in a target work area; acquiring stratigraphic data from the target wells; establishing P-wave velocity, S-wave velocity, and density models to obtain seismic wavelets; conducting forward modeling based on acoustic wave equations to obtain first seismic shot records; conducting forward modeling based on elastic wave equations to obtain second seismic shot records; migrating and imaging the first and second seismic shot records respectively to obtain acoustic seismic data and elastic wave seismic data; and determining whether the well-seismic mismatch is caused by seismic wave elastic effects by comparing and analyzing the amplitude and waveform variations of the acoustic and elastic wave seismic data with synthesized well logging data and field-acquired seismic data. This invention solves the problem of reasonably interpreting the causes of well-seismic mismatch.

The application discloses a kind of SBP-SAT-based block staggered grid seismic wave simulation method, belong to the technical field of seismic numerical simulation, first establish the first-order velocity-pressure acoustic wave equation containing auxiliary differential equation, then complete space domain staggered grid SBP discrete and SAT boundary correction term is injected into physical variable equation and PML auxiliary differential equation simultaneously, subsequently construct the non-uniform grid interface SAT coupling term that meets SBP energy compatible condition, finally complete seismic wave field simulation by parameter setting and time domain integration.The whole process eliminates the long-time numerical drift problem of PML under high-order format theoretically, realizes the energy conservation and stable coupling of coarse and fine grid interface, takes into account the double advantages of staggered grid low-frequency dispersion and block grid high efficiency, significantly improves the precision and computing performance of complex medium acoustic forward.

The application discloses an optimization method and device for viscoacoustic wave reverse-time migration imaging. The method comprises the following steps: under the constraint of a velocity model and a constant Q model of a target block, forward simulation of seismic waves in a stratum is carried out by using a viscoacoustic wave equation to obtain wave field forward simulation records at each time; based on a compensation operator, the wave field forward simulation records at each time are reverse-time extended, and wave field separation is carried out by using a wave field separation condition to obtain upgoing wave fields and downgoing wave fields; the upgoing wave fields and the downgoing wave fields are correlated and imaged by using a cross-correlation imaging condition to obtain reverse-time migration imaging results of the seismic waves; and the reverse-time migration imaging results are optimized according to an X-type operator to obtain optimized reverse-time migration imaging results. The attenuation problem of the propagation of the seismic waves in a viscoelastic medium can be solved, and more accurate reverse-time migration imaging results can be obtained.