Thinking what a great problem to have . To much oil in the lower zones at the A 5 drill to tap C13 / C14. Probably have to do a shallow A6 well to target this zone in between A4 - A5 coz will be a long time before A4 - C17c up to C16a runs dry enough to co mingle flow into C13/14 : )
................................
"C13 and C14 Carbonates – The Atzam #4 well produced impressive oil shows during the drilling of the well through the C13 and C14 carbonates, complemented by higher than expected permeability and porosity results from the electric logs over these sections. This established the C13 and C14 carbonates as two of the reservoir sections in the well that display strong commercial potential, and are the main producing zones in the nearby Rubelsanto Field.
The Rubelsanto Field has produced over 30 mmbbl to date from 8 wells and is located only 17km to the north east of the Atzam Field, along a structural fault offset.
.........................................
Atzam # 4- Initial ELAN and CMR Log Interpretation Results
Zone
Depth
Thickness
% Porosity
% Oil Saturation
Permeability
C13 A
1748-1794 --- Depth "
46 feet
15-45%
Up to 53%
Up to 559 md
C13 B
1806-1824
18 feet
20%
Up to 49%
C14 A
1845-1860
15 feet
28%
Up to 54%
C14 B
1902-1915
13 feet
13-15%
Up to 74%
Up to 131 md
C16 A
2464-2470
16 feet
15%
Up to 58%
1,390 md
C16 B
2494-2514
20 feet
10%
Up to 73%
50 md
C17 A
2772-2774
2 feet
12%
Up to 90%
100
C17 B
2846-2854
8 feet
6-8%
Up to 50%
C17 C
2974-2980
6 feet
8-10%
Up to 80%
C18 A
3140-3160
20 feet
10-14%
Up to 68%
Up to 387 md
C18 B
3278-3286
Est 8 feet
*
*
C18 N
3675-3695
Est 20 feet
*
*
C18 O
3706-3712
Est 6 feet
*
*
C19
3736-3756
20 feet
*
*
Total
218 feet (incl. C18 B, N and O and C19)
...........................................
* Porosities and oil saturations not measurable because of large hole diameter caused by extremely fractured and friable limestones and dolomites in the section. The C18 N and O correlate to the producing section in the Atzam #2 well as does the top of the C19. Oil and gas shows in the zones while drilling and a structural gain of 270 and 240 feet respectively indicate productive intervals. Formation tops were picked based upon drilling samples, drilling times and gamma ray logging. Permeabilities were measured in specific points by CMR log.
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