6. Suspended Exploratory Well Costs

The following summarizes the changes in suspended exploratory well costs at December 31 for each of the last three years. Additions pending the determination of proved reserves excludes amounts capitalized and subsequently charged to expense within the same year.



millions	2015			2014			2013
Balance at January 1	$	1,522		$	2,232		$	2,062
Additions pending the determination of proved reserves	461			421			848
Divestitures and other ⁽¹⁾	(33		)	(913		)	(48		)
Reclassifications to proved properties	(104		)	(100		)	(507		)
Charges to exploration expense ⁽²⁾	(722		)	(118		)	(123		)
Balance at December 31	$	1,124		$	1,522		$	2,232

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⁽¹⁾	Includes $(744) million during 2014 related to the Company’s sale of a 10% working interest in Offshore Area 1 in Mozambique.


⁽²⁾	Includes $(565) million during 2015 related to Brazil. Given the current oil-price environment and other considerations, the Company does not expect to have substantive exploration and development activities in Brazil in the foreseeable future.

The following provides an aging of suspended well balances at December 31:



millions	2015		2014		2013
Exploratory well costs capitalized for a period of one year or less	$	452	$	393	$	836
Exploratory well costs capitalized for a period greater than one year	672		1,129		1,396
Balance at December 31	$	1,124	$	1,522	$	2,232

6. Suspended Exploratory Well Costs (Continued)

The following summarizes a further aging by geographic area of those exploratory well costs that have been capitalized for a period greater than one year since the completion of drilling at December 31, 2015:



millions except projects	Number of Projects	Total		2014		2013		2012 and prior
United States—Onshore	18	$	55	$	34	$	11	$	10
United States—Offshore	4	314		77		80		157
International	7	303		119		3		181
	29	$	672	$	230	$	94	$	348

Projects with suspended exploratory well costs are those identified by management as exhibiting sufficient quantities of hydrocarbons to justify potential development and where management is actively pursuing efforts to assess whether reserves can be attributed to these projects. Suspended exploratory well costs capitalized for a period greater than one year after completion of drilling at December 31, 2015, primarily related to the Gulf of Mexico, Ghana, and Mozambique.

For projects located in the Gulf of Mexico, the majority of exploratory well costs capitalized greater than one year are related to the Shenandoah discovery. Well costs have been suspended pending further appraisal activities, including drilling and analysis of well results. Appraisal activities undertaken at the Shenandoah discovery include the acquisition of whole-core across the primary reservoir interval, the processing and analysis of seismic data, reservoir simulation modeling, and analysis of well results. Remaining activities required to classify the associated reserves as proved for the Shenandoah discovery include completion of geologic, reservoir, and economic modeling; product development testing; and pre-front-end engineering and design (FEED) and FEED engineering studies.

For projects located in Ghana, exploratory well costs that have been capitalized greater than one year are pending development plan approval. During the fourth quarter of 2015, the Company and its partners submitted the Jubilee full field development plan for the Mahogany East and Teak areas. Remaining activities required to classify the associated reserves as proved include approval of development plans and project sanctioning.

For projects located in Mozambique, the majority of exploratory well costs capitalized greater than one year are related to the Orca, Tubarão, and Tubarão Tigre discoveries. Well costs have been suspended pending further appraisal activities, including analysis of well results and seismic reprocessing. During 2015, drilling and evaluation operations at the Tubarão Tigre-2 appraisal well were completed. Anadarko is continuing to appraise the Orca, Tubarão, and Tubarão Tigre discoveries in accordance with the appraisal programs provided to the government of Mozambique in the first quarter of 2015.

If additional information becomes available that raises substantial doubt as to the economic or operational viability of any of these projects, the associated costs will be expensed at that time.