Multiclient Seismic Data

9 Months Ended

Sep. 30, 2011

Multiclient Seismic Data [Abstract]

Multiclient Seismic Data

7. Multiclient Seismic Data

The change in the carrying amount of multiclient seismic data for the nine months ended September 30, 2011 was as follows:

	(Stated in millions)
Balance at December 31, 2010	$	394
Capitalized in period		206
Charged to expense		(156	)
Balance at September 30, 2011	$	444