Diffraction Imaging using Pseudo Dip-Angle Gather
AssigneeSaudi Arabian Oil Company
InventorsLu Liu, Yi Luo, Tong Wang Fei
Life of this patent
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Abstract
Systems, methods, and apparatuses for generating a subsurface image using diffraction energy information are disclosed. The systems, methods, and apparatuses may include converting a shot gather into one or more plane-wave gather using a Radon transform. The plane-wave gathers may be extrapolated into source-side wavefields and receiver-side wavefields and further generate a pseudo dip-angle gather. The diffraction energy information may be extracted from the pseudo dip-angle gather, and an image containing subsurface features may be generated from the extracted diffraction energy information. The receiver-side wavefields may be decomposed using a recursive Radon transform.
Claims20
A computer-implemented method performed by one or more processors for generating an image of subsurface features of a portion of the earth using diffraction energy, the method comprising the following operations:
- receiving shot gathers formed from a plurality of shots;
- converting the shot gather into one or more plane-wave gathers;
- selecting one of the plane-wave gathers;
- extrapolating source-side wavefields of the plane-wave gather;
- extrapolating and decomposing receiver-side wavefields of the plane-wave gather;
- forming a pseudo dip-angle gather by applying an imaging condition to the extrapolated plane-wave source-side wavefields and the extrapolated and decomposed plane-wave receiver-side wavefields;
- extracting the diffraction image information from the pseudo dip-angle gather;
- and
- generating a stacked diffraction image representative of subsurface features of a portion of the earth.
A computer program product encoded on a non-transitory medium, the computer program product comprising computer readable instructions for causing one or more processors to perform operations comprising:
- receiving shot gathers formed from a plurality of shots;
- converting the shot gather into one or more plane-wave gathers;
- selecting one of the plane-wave gathers;
- extrapolating source-side wavefields of the plane-wave gather;
- extrapolating and decomposing receiver-side wavefields of the plane-wave gather;
- forming a pseudo dip-angle gather by applying an imaging condition to the extrapolated plane-wave source-side wavefields and the extrapolated and decomposed plane-wave receiver-side wavefields;
- extracting the diffraction image information from the pseudo dip-angle gather;
- and
- generating a stacked diffraction image representative of subsurface features of a portion of the earth.
An apparatus for generating an image of subsurface features using diffraction energy information comprising:
- one or more processors;
- and
- a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, the programming instructions operable to instruct the one or more processors to:
- receive shot gathers formed from a plurality of shots;
- convert the shot gather into one or more plane-wave gathers;
- select one of the plane-wave gathers;
- extrapolate source-side wavefields of the plane-wave gather;
- extrapolate and decompose receiver-side wavefields of the plane-wave gather;
- form a pseudo dip-angle gather by applying an imaging condition to the extrapolated plane-wave source-side wavefields and the extrapolated and decomposed plane-wave receiver-side wavefields;
- extract the diffraction image information from the pseudo dip-angle gather;
- and
- generate a stacked diffraction image representative of subsurface features of a portion of the earth.
Dependencies are inferred from the claim text.