Hybrid seabed seismic acquisition geometry using a combination of nodes and autonomous underwater vehicles

1 . A method comprising:

defining a first receiver grid for a wide-azimuth seismic survey over a subterranean region of interest,

wherein the first receiver grid comprises a first plurality of receiver locations on a seafloor above the subterranean region of interest;

defining a second receiver grid for an ocean bottom node (OBN) seismic survey over the subterranean region of interest,

wherein the second receiver grid comprises a second plurality of receiver locations on the seafloor, and

wherein the second plurality of receiver locations is spatially dense relative to the first plurality of receiver locations;

deploying one seismic receiver among a first plurality of seismic receivers at each of the first plurality of receiver locations;

deploying one seismic receiver among a second plurality of seismic receivers at each of the second plurality of receiver locations;

activating a seismic source at a source location;

recording, using the first plurality of seismic receivers, a first seismic dataset that corresponds to the wide-azimuth seismic survey;

recording, using the second plurality of seismic receivers, a second seismic dataset that corresponds to the OBN seismic survey;

generating, using a velocity analysis method, a velocity model using the first seismic dataset;

forming a seismic image using the velocity model and the second seismic dataset; and

determining a location of a hydrocarbon reservoir within the subterranean region of interest based on the seismic image.

2 . The method of claim 1 , further comprising planning a wellbore to penetrate the hydrocarbon reservoir based on the location, wherein the planned wellbore comprises a planned wellbore path.

3 . The method of claim 2 , further comprising drilling the wellbore guided by the planned wellbore path.

4 . The method of claim 1 , wherein at least one of the first plurality of seismic receivers is deployed using an autonomous underwater vehicle.

5 . The method of claim 1 , further comprising:

retrieving the first plurality of seismic receivers using an autonomous underwater vehicle; and

repositioning one seismic receiver among the first plurality of seismic receivers at each of a third plurality of receiver locations using the autonomous underwater vehicle.

6 . The method of claim 5 , wherein the first receiver grid comprises the third plurality of receiver locations on the seafloor.

7 . The method of claim 1 , further comprising:

retrieving the first plurality of seismic receivers using an autonomous underwater vehicle; and

downloading to a seismic processing system a portion of the first seismic dataset.

8 . The method of claim 1 , wherein the velocity analysis method comprises full waveform inversion.

9 . A system comprising:

a seismic acquisition system comprising a first plurality of seismic receivers and a second plurality of seismic receivers,

wherein a first receiver grid, for a wide-azimuth seismic survey over a subterranean region of interest, comprises a first plurality of receiver locations on a seafloor above the subterranean region of interest,

wherein a second receiver grid, for an ocean bottom node (OBN) seismic survey over the subterranean region of interest, comprises a second plurality of receiver locations on the seafloor,

wherein the second plurality of receiver locations is spatially dense relative to the first plurality of receiver locations,

wherein one seismic receiver among the first plurality of seismic receivers is deployed at each of the first plurality of receiver locations,

wherein the first plurality of seismic receivers is configured to record a first seismic dataset that corresponds to the wide-azimuth seismic survey,

wherein one seismic receiver among the second plurality of seismic receivers is deployed at each of the second plurality of receiver locations,

wherein the second plurality of seismic receivers is configured to record a second seismic dataset that corresponds to the OBN seismic survey,

and

a seismic source configured to activate at a source location;

a seismic processing system configured to:

receive, from the first plurality of seismic receivers, the first seismic dataset,

receive, from the second plurality of seismic receivers, the second seismic dataset,

generate, using a velocity analysis method, a velocity model using the first seismic dataset, and

form a seismic image using the velocity model and the second seismic dataset; and

a seismic interpretation workstation configured to:

determine a location of a hydrocarbon reservoir within the subterranean region based on the seismic image.

10 . The system of claim 9 , further comprising a wellbore planning system configured to plan a wellbore to penetrate the hydrocarbon reservoir based on the location, wherein the planned wellbore comprises a planned wellbore path.

11 . The system of claim 10 , further comprising a drilling system configured to drill the wellbore guided by the planned wellbore path.

12 . The system of claim 9 , wherein at least one of the first plurality of seismic receivers is deployed using an autonomous underwater vehicle.

13 . The system of claim 9 , further comprising an autonomous underwater vehicle configured to:

retrieve the first plurality of seismic receivers; and

reposition one seismic receiver among the first plurality of seismic receivers at each of a third plurality of receiver locations.

14 . The system of claim 9 , further comprising an autonomous underwater vehicle configured to:

retrieve the first plurality of seismic receivers; and

download, to the seismic processing system, a portion of the first seismic dataset.