Imaging shallow heterogeneities based on near-surface scattered elastic waves
AssigneeSaudi Arabian Oil Company
InventorAbdulaziz Mohammad Almuhaidib
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Abstract
Scattered body waves are isolated to primary, shear, and surface waves as a receiver wavefield from recorded near-surface scattered wave data generated by scatters. The isolated receiver wavefield is backward propagated through an earth model from a final to an initial state. A source wavefield and the receiver wavefields are cross-correlated. A source wavefield and the receiver wavefields are stacked, over all time steps and sources, to generate a subsurface image. A display of the subsurface image is initiated.
Claims20
A computer-implemented method for imaging and locating near-surface heterogeneities, the method comprising:
- receiving near-surface scattered wave data generated by scatterers at an earth near-surface that scatter reflected or refracted body waves;
- isolating, from the near-surface scattered wave data, scattered reflected or refracted body-to-primary, reflected or refracted body-to-shear, and reflected or refracted body-to-surface waves as a receiver wavefield;
- backward-propagating the isolated receiver wavefield through an earth model until they are in-phase with incident waves at locations of the scatterers;
- forward propagating a source wavefield through the earth model;
- cross-correlating the source wavefield and the isolated receiver wavefield;
- stacking, over all time steps and sources, the source wavefield and the isolated receiver wavefield to generate a subsurface image that includes an image of the scatterers;
- and
- initiating display of the subsurface image that includes the image of the scatterers.
A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations for imaging and locating near-surface heterogeneities, comprising:
- receiving near-surface scattered wave data generated by scatterers at an earth near-surface that scatter reflected or refracted body waves;
- isolating, from the near-surface scattered wave data, scattered reflected or refracted body-to-primary, reflected or refracted body-to-shear, and reflected or refracted body-to-surface waves as a receiver wavefield;
- backward-propagating the isolated receiver wavefield through an earth model until they are in-phase with incident waves at locations of the scatterers;
- forward propagating a source wavefield through the earth model;
- cross-correlating the source wavefield and the isolated receiver wavefield;
- stacking, over all time steps and sources, the source wavefield and the isolated receiver wavefield to generate a subsurface image that includes an image of the scatterers;
- and
- initiating display of the subsurface image that includes the image of the scatterers.
A computer-implemented system to perform operations for imaging and locating near-surface heterogeneities, comprising:
- a computer memory operable to store recorded near-surface scattered wave data generated by scatters;
- and
- a data processing apparatus interoperably coupled with the computer memory and configured to:
- receive near-surface scattered wave data generated by scatterers at an earth near-surface that scatter reflected or refracted body waves;
- isolate, from the near-surface scattered wave data, scattered reflected or refracted body-to-primary, reflected or refracted body-to-shear, and reflected or refracted body-to-surface waves as a receiver wavefield;
- backward-propagate the isolated receiver wavefield through an earth model until they are in-phase with incident waves at locations of the scatterers;
- forward propagate a source wavefield through the earth model;
- cross-correlate the source wavefield and the isolated receiver wavefield;
- stack, over all time steps and sources, the source wavefield and the isolated receiver wavefield to generate a subsurface image that includes an image of the scatterers;
- and
- initiate display of the subsurface image that includes the image of the scatterers.
Dependencies are inferred from the claim text.