GECO (1980)
Ogle Petroleum Inc.
MARINE SEISMIC DATA SANTA BARBARA CHANNEL
OFFSHORE CALIFORNIA
Fact Sheet

The GECO (1980) series of Ogle Petroleum Inc. proprietary seismic data was collected by the Geophysical Company of Norway A.S. vessel M/V "GECO Alpha" during the period December 14 to 30, 1980. A total of 840 line miles were collected in this survey. 
The data were processed by GeoCenter, Inc. A list of the individual line mileages and the processing sequence are shown in Exhibits A and B of this document.

The technical specifications and recording information are as follows:
* General -- Fold: 4800%
Record Length: 6 seconds
Sample Rate: 2 ms
* Source -- 1951 cu in Airgun
* Instrument Parameters --  Instrument: DFS V
                                     --  Filters: Hi 128, Lo 5.3
* Streamer Parameters    --  Cable Length: 2409 m 
                                     --  Live Sections: 48
                                     --  Section Intervals: 25
                                     --  Hydrophones/Section: 32
* Navigation -- Primary: ARGO
                  -- Secondary: Satellite/Loran C

All lines are available in the following formats:
* 4800% CDP Stack
* Wave Equation Migration
* Depth Display
* Preserved Amplitude Normal and Reverse

The following supporting information may be obtained for this seismic survey:
* Reproductions of OPI Santa Barbara Channel seismic shot point base maps, sheets 3, 4, 5 and 6, whereon all GECO lines are located
* Navigation tape for all seismic shot point locations
* Magnetic tapes containing stacking velocity data and water corrected RMS velocity information.
* Seismic field tapes for all lines.




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GECO (1980)
EXHIBIT A
AGC and WEM Processing Sequences
1. Demultiplex, binary gain recovery, 6 sec. data, output @ 4 ms sample rate.
2. Amplitude recovery by user-chosen gain curve or AGC. 
3. 4800% CDP trace gather.
4. Deconvolution, frequency spectrum analysis. 
5. Deconvolution, filter application.
6. Velocity analysis, constant velocity stack method, one per mile.
7. Mute Test.
8. NMO application, Mute.
9. 4800% CDP stack.
10. Filter analysis.
11. Time-variant filter application.
12. Time-variant scaling.
13. Film display.
14. Wave equation migration.
15. Film display.
16. Time-to-depth conversion.
17. Film display.


True Amplitude Processing Sequence
1.  Demultiplex 6.0 sec. data	7. Constant Velocity Stack
2.  Synthetic Gain Curve	8. NMO, Mute 
     Application	9. 4800% CDP Stack
3.  4800% CDP Trace Gather	10. Paper Display
4.  Paper Display	11. Band Pass Filter
5.  Edit	12. Film Display 
6. Deconvolution



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GECO (1980)
EXHIBIT B
Line No.	Mileage	
1
5.24
2
3.82
3
5.55
4
3.82
5
4.69
6
10.58
7
4.69
8
13.71
9
5.20
10
4.61
11
18.28
12
15.32
13
28.23
14
28.54
15
25.20
16
22.56
17
23.49
18
29.00
19
21.76
20
17.43
21
7.78
22
7.10
23
9.24
24
9.27
25
9.27
26
8.73
27
10.21
28
10.21
29
8.96
30
10.36
31
9.04
32
9.74
33
11.60
34
9.27
35
9.35
36
9.35
37
11.14
38
9.43
39
9.41
40
9.43
41
9.51
42
9.67
43
9.74
44
9.66
45
7.72
46
7.80
47
7.80
48
10.52
49
6.87
50
6.85
51
6.87
52
6.87
53
8.11
54
6.87
55
6.87
56
10.75
57
7.10
58
10.98
59
7.10
60
12.46
61
8.26
62
12.69
63
7.10
64
7.18
65
7.18
66
7.18
67
9.97
68
7.18
69
7.99
70
7.78
71
13.08
72
7.78
73
7.88
74
7.88
75
15.00
P-1
5.47
P-2
4.69
P-3
5.39
P-4
6.40
P-5
5.47
P--6
5.39
P-7
6.25
P-8
5.61
P--9
5.06
P-10
4.92





Totals:	85 lines	839.51 miles


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