Supplementary Information For Oil And Gas Producing Activities (Proved Developed And Undeveloped Oil And Gas Reserve Quantities) (Details)
|
12 Months Ended |
|
Sep. 30, 2014
MMcf
|
Sep. 30, 2013
MMcf
|
Sep. 30, 2012
MMcf
|
Sep. 30, 2011
MMcf
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Undeveloped Reserve (Volume) |
512,000,000,000 |
|
452,000,000,000 |
|
410,000,000,000 |
|
|
Natural Gas (Mmcf) [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
1,299,515 |
|
988,434 |
|
674,922 |
|
|
Extensions and Discoveries |
446,821 |
|
361,624 |
|
436,098 |
|
|
Revisions of Previous Estimates |
45,048 |
|
53,150 |
|
(56,455) |
|
|
Production Volume |
(142,307) |
|
(103,693) |
|
(66,131) |
|
|
Purchases of Minerals in Place |
33,986 |
|
|
|
|
|
|
Sales of Minerals in Place |
(179) |
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
1,682,884 |
|
1,299,515 |
|
988,434 |
|
|
Proved Developed Reserves (Volume) |
1,177,808 |
|
866,917 |
|
604,483 |
|
414,423 |
Proved Undeveloped Reserve (Volume) |
505,076 |
|
432,598 |
|
383,951 |
|
260,499 |
Oil Mbbl [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
41,598 |
|
42,862 |
|
43,345 |
|
|
Extensions and Discoveries |
1,539 |
|
2,443 |
|
1,257 |
|
|
Revisions of Previous Estimates |
(1,694) |
|
(876) |
|
1,130 |
|
|
Production Volume |
(3,036) |
|
(2,831) |
|
(2,870) |
|
|
Purchases of Minerals in Place |
83 |
|
|
|
|
|
|
Sales of Minerals in Place |
(13) |
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
38,477 |
|
41,598 |
|
42,862 |
|
|
Proved Developed Reserves (Volume) |
37,255 |
|
38,365 |
|
38,444 |
|
37,580 |
Proved Undeveloped Reserve (Volume) |
1,222 |
|
3,233 |
|
4,418 |
|
5,765 |
West Coast Region [Member] | Natural Gas (Mmcf) [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
60,777 |
|
63,023 |
|
68,316 |
|
|
Extensions and Discoveries |
0 |
|
702 |
|
638 |
|
|
Revisions of Previous Estimates |
1,358 |
|
112 |
|
(2,463) |
|
|
Production Volume |
(3,210) |
|
(3,060) |
|
(3,468) |
|
|
Purchases of Minerals in Place |
0 |
|
|
|
|
|
|
Sales of Minerals in Place |
(103) |
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
58,822 |
|
60,777 |
|
63,023 |
|
|
Proved Developed Reserves (Volume) |
57,907 |
|
59,862 |
|
59,923 |
|
63,965 |
Proved Undeveloped Reserve (Volume) |
915 |
|
915 |
|
3,100 |
|
4,351 |
West Coast Region [Member] | Oil Mbbl [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
41,315 |
|
42,556 |
|
43,066 |
|
|
Extensions and Discoveries |
1,521 |
|
2,443 |
|
1,229 |
|
|
Revisions of Previous Estimates |
(1,677) |
|
(881) |
|
1,095 |
|
|
Production Volume |
(3,005) |
|
(2,803) |
|
(2,834) |
|
|
Purchases of Minerals in Place |
83 |
|
|
|
|
|
|
Sales of Minerals in Place |
(13) |
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
38,224 |
|
41,315 |
|
42,556 |
|
|
Proved Developed Reserves (Volume) |
37,002 |
|
38,082 |
|
38,138 |
|
37,306 |
Proved Undeveloped Reserve (Volume) |
1,222 |
|
3,233 |
|
4,418 |
|
5,760 |
Appalachian Region [Member] | Natural Gas (Mmcf) [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
1,238,738 |
|
925,411 |
|
606,606 |
|
|
Extensions and Discoveries |
446,821 |
[1] |
360,922 |
[1] |
435,460 |
[1] |
|
Revisions of Previous Estimates |
43,690 |
|
53,038 |
|
(53,992) |
|
|
Production Volume |
(139,097) |
[2] |
(100,633) |
[2] |
(62,663) |
[2] |
|
Purchases of Minerals in Place |
33,986 |
|
|
|
|
|
|
Sales of Minerals in Place |
(76) |
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
1,624,062 |
|
1,238,738 |
|
925,411 |
|
|
Proved Developed Reserves (Volume) |
1,119,901 |
|
807,055 |
|
544,560 |
|
350,458 |
Proved Undeveloped Reserve (Volume) |
504,161 |
|
431,683 |
|
380,851 |
|
256,148 |
Appalachian Region [Member] | Oil Mbbl [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
283 |
|
306 |
|
279 |
|
|
Extensions and Discoveries |
18 |
|
0 |
|
28 |
|
|
Revisions of Previous Estimates |
(17) |
|
5 |
|
35 |
|
|
Production Volume |
(31) |
|
(28) |
|
(36) |
|
|
Purchases of Minerals in Place |
0 |
|
|
|
|
|
|
Sales of Minerals in Place |
0 |
|
|
|
|
|
|
Proved Developed and Undeveloped Reserves |
253 |
|
283 |
|
306 |
|
|
Proved Developed Reserves (Volume) |
253 |
|
283 |
|
306 |
|
274 |
Proved Undeveloped Reserve (Volume) |
0 |
|
0 |
|
0 |
|
5 |
Marcellus Shale Fields [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Proved Undeveloped Reserve (Volume) |
504,000,000,000 |
|
432,000,000,000 |
|
381,000,000,000 |
|
|
Marcellus Shale Fields [Member] | Natural Gas (Mmcf) [Member]
|
|
|
|
|
|
|
|
Reserve Quantities [Line Items] |
|
|
|
|
|
|
|
Extensions and Discoveries |
442,000 |
|
355,000 |
|
435,000 |
|
|
Production Volume |
131,590 |
|
93,999 |
|
55,812 |
|
|
Percentage exceeding total reserve of production in proved developed and undeveloped reserves |
15.00% |
|
|
|
|
|
|
|
|