1-20. (canceled)
21. A method, comprising:
obtaining an isotropic depth image of a geophysical volume;
obtaining time-depth pairs at downhole locations in the geophysical volume;
generating, via a computer, mis-tie values as a function of a discrepancy between a depth and a corresponding isotropic depth based on the isotropic depth image;
assigning uncertainties to the mis-tie values; and
generating a mis-tie volume that satisfies a target goodness of fit with the mis-tie values.
22. The method of claim 21, comprising:
obtaining an isotropic velocity volume for the geophysical volume; and
determining the isotropic depth image based on an isotropic velocity analysis of the isotropic velocity volume.
23. The method of claim 22, comprising:
generating the mis-tie values based on the time-depth pairs and the isotropic velocity volume.
24. The method of claim 21, comprising:
obtaining a calibration velocity from the mis-tie volume.
25. The method of claim 24, comprising:
differentiating the mis-tie volume to obtain the calibration velocity, wherein the calibration velocity is an estimate of a velocity of vertically propagating waves in the geophysical volume.
26. The method of claim 21, comprising:
adjusting the isotropic depth image using the mis-tie volume.
27. The method of claim 21, comprising:
generating a time image from the isotropic depth image.
28. The method of claim 27, comprising:
generating a depth image from the time image.
29. The method of claim 29, wherein the depth image is substantially equivalent to an adjusted isotropic image from the mis-tie volume.
30. The method of claim 21, comprising:
computing the depth mis-tie values according to the expression:
m(x, y, t)=ziso(x, y, t)\u2212z(x, y, t)
where ziso(x, y, t) is an isotropic depth based on the isotropic depth image, z(x, y, t) is a depth, and m(x, y, t) is a depth mis-tie.
31. A computer implemented method comprising:
obtaining, via a computer, an isotropic depth image of a geophysical volume;
obtaining time-depth pairs at downhole locations in the geophysical volume, the time-depth pairs corresponding to one or more wells located in the geophysical volume based on the data indicative of the at least one measurement;
generating, via the computer, mis-tie values as a function of a discrepancy between a depth and a corresponding isotropic depth based on the isotropic depth image;
assigning uncertainties to the depth mis-tie values;
generating a smoothest mis-tie volume that satisfies a target goodness of fit with the depth mis-tie values;
obtaining a calibration velocity from the mis-tie volume;
generating a time image from the isotropic depth image; and
generating a depth image from the time image using the calibration velocity.
32. The computer implemented method of claim 31, comprising:
obtaining an isotropic velocity volume for the geophysical volume using data indicative of at least one seismic survey.
33. The computer implemented method of claim 31, comprising:
adjusting the isotropic depth image using the mis-tie volume.
34. The computer implemented method of claim 31, comprising:
computing the depth mis-tie values according to the expression:
m(x, y, t)=ziso(x, y, t)\u2212z(x, y, t)
where ziso(x, y, t) is an isotropic depth based on the isotropic depth image, z(x, y, t) is a depth, and m(x, y, t) is a depth mis-tie.
35. A computer configured to:
obtain an isotropic depth image of a geophysical volume;
obtain time-depth pairs at downhole locations in the geophysical volume;
generate mis-tie values as a function of a discrepancy between a depth and a corresponding isotropic depth based on the isotropic depth image;
assign uncertainties to the mis-tie values; and
generate a mis-tie volume that satisfies a target goodness of fit with the mis-tie values.
36. The computer of claim 35, further configured to:
obtain an isotropic velocity volume for the geophysical volume; and determine the isotropic depth image based on an isotropic velocity analysis of the isotropic velocity volume.
37. The computer of claim 36, further configured to:
generating the mis-tie values based on the time-depth pairs and the isotropic velocity volume.
38. The computer of claim 35, further configured to:
obtain an isotropic velocity volume for the geophysical volume using data indicative of at least one seismic survey.
39. The computer of claim 35, further configured to:
obtain a calibration velocity from the mis-tie volume; and
differentiate the mis-tie volume to obtain the calibration velocity, wherein the calibration velocity is an estimate of the velocity of vertically propagating waves in the geophysical volume.
40. The computer of claim 35, further configured to:
computing the depth mis-tie values according to the expression:
m(x, y, t)=ziso(x, y, t)\u2212z(x, y, t)
where ziso(x, y, t) is an isotropic depth based on the isotropic depth image, z(x, y, t) is a depth, and m(x, y, t) is a depth mis-tie.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A slingshot bail guard, the bail guard comprising: a slightly arcuate body having a width;
a pair of upper channels on a first side of the body, the upper channels disposed opposite one another across the width of the body;
a pair of lower channels on a second side of the body, the lower channels disposed opposite one another across the width of the body;
a pair of grooves, the grooves formed between the upper channels and the lower channels and disposed opposite one another across the width of the body,
wherein the upper channels comprise a plurality of lips and the lower channels comprise a plurality of nubs.
2. The slingshot bail guard of claim 1 wherein the bail guard is formed of a molded plastic.
3. The slingshot bail guard of claim 1 wherein the bail guard is slightly Flexible.
4. The slingshot bail guard of claim 1 wherein in the body further comprises a carved upper edge and a curved lower edge.
5. The slingshot bail guard of claim 1 wherein the grooves are dimensioned to accommodate an arm brace of a slingshot.
6. The slingshot bail guard of claim 1 wherein the upper channels and the lower channels are dimensioned to frictionally engage an arm brace of a slingshot.
7. The slingshot bail guard of claim 1 wherein the upper channels and the lower channels have a generally semi-circular profile.
8. The slingshot bail guard of claim 1 wherein the upper channels and the lower channels are angled outwardly from each other hi a rearward direction.
9. A slingshot bail guard, the bail guard comprising;
a body having a width;
a pair of upper channels, the upper channels disposed opposite one another across the width of the body and dimensioned to frictionally engage an arm brace of a slingshot;
a pair of lower channels, the lower channels disposed opposite one another across the width of the body and dimensioned to frictionally engage the arm brace of the slingshot; and
a pair of grooves, the grooves formed between the upper channels and the lower channels and disposed opposite one another across the width of the body.
10. The slingshot bail guard of claim 9 wherein the upper channels comprise a plurality of lips and the lower channels comprise a plurality of nubs.
11. The slingshot bail guard of claim 9 wherein the body is arcuate.
12. The slingshot bail guard of claim 9 wherein the bail guard is formed of a molded plastic.
13. The slingshot bail guard of claim 9 wherein the bail guard is slightly flexible.
14. The slingshot bail guard of claim 9 wherein in the body further comprises a curved upper edge and a curved lower edge.
15. The slingshot bail guard of claim 9 wherein the grooves are dimensioned to accommodate the arm brace of the slingshot.
16. The slingshot bail guard of claim 9 wherein the upper channels and the lower channels have a generally semi-circular profile.
17. The slingshot bail guard of claim 9 wherein the upper channels and the lower channels are angled outwardly from each other in a rearward direction.
18. The slingshot bail guard of claim 1 wherein the bail guard is removably attachable to an aim brace of a slingshot.
19. The slingshot bail guard of claim 9 wherein the bail guard is removably attachable to the arm brace of the slingshot.