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In this case the desired fold for a 10 m x 10 m bin is 24.
This fold can be decomposed as, say, 6 inline and
4 cross-line. Since the fold cross-line is half the number of receiver lines in
the recording patch, this means the recording patch will have 8 receiver lines.
The distance between the receiver lines *drl* can be computed as
| |
(3) |

where is the maximum offset cross-line, 3000 m in this case,
and *nrl* is the number of receiver lines per patch, 8 in this case. This gives
*drl*=400 *m*.
The source line interval (*dsl*) can be similarly computed from the expectation that
the inline fold be 6.

| |
(4) |

Here *nchl* is the number of channels per receiver line, 300 in this case
(maximum inline offset of 3000 m and receiver interval 20 m), is the receiver interval, 20 m, and *Fold*_{x} is 6. This gives *dsl*=500 *m*.
If we wanted to apply the theory of symmetric wavefield sampling we might
set *dsl*=400 *m*. Here I will not use the symmetric wavefield sampling theory.

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Stanford Exploration Project

7/8/2003