Converting a first acquired data subset to a second acquired data subset
Acquired data that corresponds at least in part to a target structure is received. One or more subsets of a first type are formed from the acquired data. The one or more subsets of the first type are converted to one or more subsets of a second, different type.
1. A method, comprising:
receiving, by a system comprising a processor, acquired data that corresponds at least in part to a target structure;
forming, by the system, one or more vector image partition (VIP) gathers from at least part of the acquired data, wherein the one or more VIP gathers comprise bins of the acquired data, the bins partitioned based on different values of an offset between a source location of a seismic source and a surface image location, the surface image location on a surface and projected from an image location within the target structure;
converting, by the system, the one or more VIP gathers into one or more angle gathers, the converting comprising mapping the one or more VIP gathers to the one or more angle gathers using a source direction of a source seismic wave; and
performing, by the system, tomography processing using the one or more angle gathers to produce an image relating to the target structure.
2. The method of claim 1 , wherein the converting comprises converting the one or more VIP gathers into one or more approximate angle gathers.
3. The method of claim 2 , wherein the converting uses an approximate velocity model.
4. The method of claim 2 , wherein the converting uses a one-dimensional (1D) velocity model.
5. The method of claim 3 , wherein the mapping comprises using the approximate velocity model to map the one or more VIP gathers to the one or more angle gathers.
6. The method of claim 3 , wherein using the approximate velocity model comprises using the approximate velocity model to compute a source direction of a source seismic wave.
7. The method of claim 6 , wherein the source direction in the mapping the one or more VIP gathers to the one or more angle gathers includes the computed source direction.
8. The method of claim 1 , further comprising:
mapping a moveout of the one or more angle gathers to a domain of the one or more VIP gathers.
9. The method of claim 8 , further comprising performing tomography processing using the mapped moveout.
10. An article comprising at least one non-transitory machine-readable storage medium storing instructions that upon execution cause a system to:
receive acquired data that corresponds at least in part to a subsurface formation;
form one or more vector image partition (VIP) gathers from the acquired data, wherein the one or more VIP gathers comprise bins of the acquired data, the bins partitioned based on different values of an offset between a source location of a seismic source and a surface image location, the surface image location on a surface above the subsurface formation and projected from an image location within the subsurface formation, the image location being a location of a seismic trace in the acquired data;
convert the one or more VIP gathers to one or more angle gathers, the converting comprising mapping the one or more VIP gathers to the one or more angle gathers using a source direction of a source wave; and
perform tomography processing using the one or more angle gathers to produce an image of the subsurface formation.
11. The article of claim 10 , wherein the converting uses a velocity model of the subsurface formation that includes velocities as a function of a plurality of coordinates.
12. The article of claim 10 , wherein the converting uses a velocity model of the subsurface formation that includes velocities as a function of one coordinate, and wherein the one or more angle gathers are approximate one or more angle gathers, and wherein applying the processing comprises mapping data of the approximate one or more angle gathers to a domain of the one or more VIP gathers.
13. The article of claim 10 , wherein the one or more angle gathers are for corresponding different values of an angle between a direction of the source wave and a direction that is normal to a dip.
14. The article of claim 13 , wherein the converting comprises:
decomposing a particular one of the one or more VIP gathers into a plurality of dip components for respective dips.
15. The article of claim 14 , wherein the converting uses an angle mapping function that maps between the angle and a difference between the direction of the source wave and the direction that is normal to the dip.
16. A system, comprising:
at least one processor to:
receive acquired data that corresponds at least in part to a target structure;
form one or more vector image partition (VIP) gathers from the acquired data, wherein the one or more VIP gathers comprise bins of the acquired data, the bins partitioned based on different values of an offset between a source location of a seismic source and a surface image location, the surface image location on a surface and projected from an image location within the target structure;
convert the one or more VIP gathers to one or more angle gathers the converting comprising mapping the one or more VIP gathers to the one or more angle gathers using a source direction of a source seismic wave; and
perform tomography processing using the one or more angle gathers to produce an image of the target structure.
17. The method of claim 1 , wherein the angle gathers are for corresponding different values of an angle between a direction of a source wave and a direction that is normal to a dip.
18. The system of claim 16 , wherein the angle gathers are for corresponding different values of an angle between a direction of a source wave and a direction that is normal to a dip.