Velocity model for sediment-basement interface using seismic and potential fields data

A system for generating a velocity model for a sediment-basement interface of a subsurface region, the system comprising:

• at least one processor;
• and
• a memory storing instructions that, when executed by the at least one processor, cause the at least one processor to perform operations comprising:
• receiving seismic data representing acoustic signals that are reflected from regions of the subsurface;
• receiving potential fields data comprising potential field values that are mapped to locations in the subsurface;
• based on the potential fields data and seismic data, generating weighted time-depth data pairs;
• selecting a velocity model that relates a velocity value to a depth value in a time-depth relationship;
• optimizing velocity coefficients of the velocity model by:
• accessing a set of velocity models;
• determining, for each velocity model, a set of depth estimates for corresponding time values;
• comparing the set of depth estimates to depth values of the weighted time-depth data pairs;
• and
• based on the comparing, adjusting the velocity coefficients of the velocity model, wherein adjusting the velocity coefficients reduces a difference between the depth estimates and the depth values of the weighted time-depth pairs;
• and
• generating, using the velocity model having the optimized coefficients, a seismic image of the sediment-basement interface.

One or more non-transitory computer readable media storing instructions for generating a velocity model for a sediment-basement interface of a subsurface region, the instructions, when executed by at least one processor, configured to cause the at least one processor to perform operations comprising:

• receiving seismic data representing acoustic signals that are reflected from regions of the subsurface;
• receiving potential fields data comprising potential field values that are mapped to locations in the subsurface;
• based on the potential fields data and seismic data, generating weighted time-depth data pairs;
• selecting a velocity model that relates a velocity value to a depth value in a time-depth relationship;
• optimizing velocity coefficients of the velocity model by:
• accessing a set of velocity models;
• determining, for each velocity model, a set of depth estimates for corresponding time values;
• comparing the set of depth estimates to depth values of the weighted time-depth data pairs;
• and
• based on the comparing, adjusting the velocity coefficients of the velocity model, wherein adjusting the velocity coefficients reduces a difference between the depth estimates and the depth values of the weighted time-depth pairs;
• and
• generating, using the velocity model having the optimized coefficients, a seismic image of the sediment-basement interface.