マレーシア・サバ沖におけるブロードバンドおよびマルチアジマス3D地震探査

抄録

Broadband acquisition and multi azimuth acquisition techniques in marine seismic survey are currently drawing considerable attention to improve the imaging for complex geology such as sub-basalt and sub-salt imaging.
In the Block DWR, offshore Sabah, Malaysia, complex toe-thrust structures are existing and conventional legacy seismic data over these structures is suffering the deterioration of imaging due to complexity of geology and existence of shallow amplitude anomalies.
JX Nippon Oil & Gas Exploration (Deepwater Sabah) conducted 3D seismic survey with combination of broadband acquisition technique using slant streamer and multi-azimuth (two azimuth) acquisition technique over the Block DWR.
Broadband acquisition technique enhanced low frequency components in the seismic data and provided with improved imaging in toe-thrust structures and deeper seismic events. Processing for merged multi-azimuth seismic data is in progress, however, the seismic stack of each azimuth show better illumination than the other in different places. This fact indicates that merged azimuth seismic data can show better imaging and better seismic event continuities.