|
Movements in net proved natural gas reserves |
(bcf) |
|
|
|
|
|
|||||
|
|
|
|
|
|
|
|
|
|
|
||
|
|
Italy (a) |
Rest of Europe |
North Africa |
Sub-Saharan |
Kazakhstan |
Rest of Asia |
America |
Australia |
Total |
||
|
2012 |
|
|
|
|
|
|
|
|
|
||
|
|||||||||||
|
Consolidated subsidiaries |
|
|
|
|
|
|
|
|
|
||
|
Reserves at December 31, 2011 |
2,491 |
1,425 |
6,190 |
1,949 |
1,648 |
685 |
590 |
604 |
15,582 |
||
|
of which: developed |
1,977 |
995 |
3,070 |
1,437 |
1,480 |
528 |
385 |
491 |
10,363 |
||
|
undeveloped |
514 |
430 |
3,120 |
512 |
168 |
157 |
205 |
113 |
5,219 |
||
|
Purchase of minerals in place |
|
|
|
|
|
|
|
|
|
||
|
Revisions of previous estimates |
154 |
45 |
|
284 |
141 |
18 |
(41) |
5 |
606 |
||
|
Improved recovery |
|
|
|
|
|
|
|
|
|
||
|
Extensions and discoveries |
24 |
15 |
1 |
113 |
469 |
2 |
4 |
|
628 |
||
|
Production |
(254) |
(168) |
(633) |
(196) |
(81) |
(143) |
(104) |
(37) |
(1,616) |
||
|
Sales of minerals in place |
(782) |
|
|
(89) |
(139) |
|
|
|
(1,010) |
||
|
Reserves at December 31, 2012 |
1,633 |
1,317 |
5,558 |
2,061 |
2,038 |
562 |
449 |
572 |
14,190 |
||
|
Equity-accounted entities |
|
|
|
|
|
|
|
|
|
||
|
Reserves at December 31, 2011 |
|
2 |
20 |
338 |
|
3,033 |
1,307 |
|
4,700 |
||
|
of which: developed |
|
|
17 |
4 |
|
24 |
8 |
|
53 |
||
|
undeveloped |
|
2 |
3 |
334 |
|
3,009 |
1,299 |
|
4,647 |
||
|
Purchase of minerals in place |
|
|
|
|
|
|
|
|
|
||
|
Revisions of previous estimates |
|
(2) |
(2) |
3 |
|
1 |
1,340 |
|
1,340 |
||
|
Improved recovery |
|
|
|
|
|
|
|
|
|
||
|
Extensions and discoveries |
|
|
|
17 |
|
38 |
739 |
|
794 |
||
|
Production |
|
|
(2) |
(2) |
|
(29) |
|
|
(33) |
||
|
Sales of minerals in place |
|
|
|
(3) |
|
|
(31) |
|
(34) |
||
|
Reserves at December 31, 2012 |
|
|
16 |
353 |
|
3,043 |
3,355 |
|
6,767 |
||
|
Reserves at December 31, 2012 |
1,633 |
1,317 |
5,574 |
2,414 |
2,038 |
3,605 |
3,804 |
572 |
20,957 |
||
|
Developed |
1,325 |
925 |
2,736 |
1,429 |
1,401 |
774 |
340 |
459 |
9,389 |
||
|
consolidated subsidiaries |
1,325 |
925 |
2,720 |
1,429 |
1,401 |
372 |
334 |
459 |
8,965 |
||
|
equity-accounted entities |
|
|
16 |
|
|
402 |
6 |
|
424 |
||
|
Undeveloped |
308 |
392 |
2,838 |
985 |
637 |
2,831 |
3,464 |
113 |
11,568 |
||
|
consolidated subsidiaries |
308 |
392 |
2,838 |
632 |
637 |
190 |
115 |
113 |
5,225 |
||
|
equity-accounted entities |
|
|
|
353 |
|
2,641 |
3,349 |
|
6,343 |
||
