Multiclient Seismic Data

3 Months Ended

Mar. 31, 2012

Multiclient Seismic Data [Abstract]

Multiclient Seismic Data

6. Multiclient Seismic Data

The change in the carrying amount of multiclient seismic data for the three months ended March 31, 2012 was as follows:

	(Stated in millions)
Balance at December 31, 2011	$	425
Capitalized in period		101
Charged to expense		(72	)
Balance at March 31, 2012	$	454