Angola - Lower Congo Basin 3d

Multi-Client Data Library – Marine

Angola Lower Congo Basin 3D The Lower Congo Basin is a prolific deepwater oil province located offshore Angola with significant discoveries and fields, such as the giant Dalia and Girassol. CGG offers a 3D survey within this promising region covering 4,380 km2 over the unlicensed Block 33. Overview The Angola-00 survey covers close to 90 % of the unlicensed Block 33 in the deep waters of Angola. It lies within a very attractive area, just 10 km south-west of the giant Dalia field with the Calulu Field being located within the survey. Only five wells have been drilled so far within this block, leaving a largely underexplored potential over the survey area, especially within the pre-salt section. As prospectivity within this basin lies within Tertiary turbidites, the Angola-00 survey was specially designed to target this unit whilst also providing clear imaging through the complex salt structures present in the area. Highlights • Total data coverage of 4,380 km2 • Key location within unlicensed acreage directly south-west of the Dalia field development • Subsalt imaging and detailed mapping of the Tertiary turbidite system

Seismic section from CGG’s Angola-00 3D survey showing excellent imaging of the presalt.

Multi-Client Data Library – Marine

Angola Geological setting

Early Cretaceous rifting resulted in the separation of Africa and South America as Gondwana began to break up. The pre-rift geology beneath the Aptian salt has remained largely unaltered and is believed to be consistent from one continent to the other. A series of analogous basins on both sides of the Atlantic can be traced along the entire length of the conjugate African and South American margins. Each of these basins contain early Cretaceous organic-rich source rocks which formed in deep, anoxic, lacustrine syn-rift basins and an extensive post-rift, Aptian-aged salt layer which acts as a regionally extensive seal.

Block 33, and a NE-SW orientation of the prospective Tertiary channels has been identified. Calulu Field flat spot

The dominant Tertiary play within the Lower Congo Basin consists of confined slope channel systems developed in the Oligocene and Miocene directly overlying mature Iabe source rocks. These channels are trapped by a series of salt-induced pillow and turtle structures. A very successful exploration campaign has proven this play throughout Blocks 15, 17 and 18, which lie directly northeast of

Seismic section showing the Calulu Field flat spot.

Geological section of the Lower Congo Basin, Angola (Total, 2010).

Acquisition parameters

Deliverables

• Survey type: 3D

• Final PSTM (Prestack Time Migration)

• Seismic vessel: Alizé

• Field Tape

• Survey size: 4,380 km2

• Acquisition and processing reports

• Data type: PSTM • Streamer length: 6 km

CGG Worldwide Headquarters Paris +33 1 64 47 45 00 Massy +33 1 64 47 30 00 Houston +1 832 351 8300

cgg.com

Regional Contact Thomas Obidairo – Multi-Client [email protected] Tel: +44 1293 68 3206

Alan Vigner – Multi-Client [email protected] Tel: +44 1293 68 3039

General Contact Europe, Africa & Middle East [email protected] Tel: +44 1293 68 3000

13F-DM-44-V3

• Record length: 8 seconds