GCA (1978)
Ogle Petroleum Inc.
MARINE SEISMIC DATA SANTA BARBARA CHANNEL
OFFSHORE CALIFORNIA


Fact Sheet

The GCA (1978) series of Ogle Petroleum Inc. proprietary seismic data was collected by the Geophysical Corporation of  Alaska using the vessel M/V "Bering Explorer" during the period May 26 to June 15, 1978. A total of 943 line miles were collected in this survey. The data were processed by J. Sefel & Associates. 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 --  Stack: 4800% CIDP
 	  --  Record Length: Line 1-59 5 sec. 
        	  --  Line 60-111 6 sec.
* Source	-- 1650 cu in Airgun Array
* Instrument Parameters -- Instrument: DFS IV 
       	 -- Filters: Hi 124, Lo 8
* Streamer Parameters    -- Cable Length: 2350 m 
       -- Live Sections: 48
* Navigation --  Primary: LORAN C
             --  Secondary: Satellite

All lines are available in the following formats:
* 4800% CDP Stack
* Wave Equation Migration
* Preserved Amplitude displays (Lines 3, 4 & 61-65 only)

The following supporting information may be obtained for 
this seismic survey:
* Reproductions of OPI Santa Barbara Channel seismic shot point base maps, sheets l, 3, 5 and 6, whereon all GCA lines are located
* Navigation tape for all seismic shot point locations 
* Computer listing, magnetic tapes containing RMS stacking velocity data


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GCA (1978)
EXHIBIT A

AGC and WEM Processing Sequences

1. Demultiplex 
2. Digital AGC 
3. 4800% CDP trace gather 
4. Paper Display
5. Edit 
6. Deconvolution 
7. Constant Velocity Stack, as required
8. NMO, Mute 
9. 4800% CDP Stack 
10. Paper Display 
11. T.V. Filter
12. T.V. Trace Equalization 
13. Film Display

Additional processing consisted of:

1. Wave Equation Migration
2. Film Display

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

GCA (1978)
EXHIBIT B


Line No.	Mileage	Line No.	Mileage
1
12.55
57
5.84
2
13.17
58
5.84
3
13.91
59
5.84
4
12.8
60
12.68
5
13.79
61
6.95
6
14.17
62
10.68
7
13.54
63
10.56
8
13.54
64
10.56
9
13.54
65
9.07
10
8.08
66
9.19
11
8.08
67
9.07
12
8.08
68
6.71
13
8.08
69
3.72
14
5.96
70
4.6
15
11.18
71
8.2
16
11.18
72
8.06
17
11.18
73
8.2
18
11.18
74
4.72
19
11.18
75
8.2
20
11.18
76
8.2
21
11.18
77
12.05
22
11.18
78
4.1
23
11.18
79
6.58
24
8.08
80
6.34
25
8.08
81
6.58
26
8.08
82
6.59
27
8.08
83
6.58
28
8.08
84
5.96
29
8.08
85
12.18
30
7.45
86
4.85
31
9.56
87
10.44
32
9.69
88
8.82
33
9.69
89
11.06
34
9.69
90
10.93
35
9.69
91
11.06
36
6.58
92
12.42
37
6.47
93
12.42
38
6.58
94
13.91
39
6.58
95
13.55
40
6.58
96
13.54
41
8.08
97
6.09
42
8.08
98
6.71
43
8.08
99
6.71
44
8.07
100
6.58
45
8.07
101
6.58
46
8.07
102
6.58
47
6.58
103
6.58
48
6.46
104
6.58
49
6.71
105
5.84
50
6.58
106
6.71
51
6.58
107
6.46
52
6.58
108
4.97
53
5.71
109
4.6
54
5.84
110
3.23
55
5.84
111
3.85
56
5.71


Total 111 Lines  Mileage: 942.91


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