Studies to enhance seismic data processing for fractured basement in the Cuu Long basin, Vietnam

Summary

The fractured granite basement is the primary oil and gas reservoir in the Cuu Long Basin, Vietnam. Due to the complexity of this non-layered target, seismic data quality within the basement is very low. For these reasons, it is important to apply improved seismic data processing workflows to improve the fracture imaging quality.

Our studies in the fractured granite basement of the Cuu Long Basin show that, application of Radon and τ-p filters improves the signal-to-noise ratio by suppressing multiples, thereby revealing the top of the faulted basement. Using a multiarrival-solution Controlled Beam Migration further improves the signal-to-noise ratio, and helps image steeply dipping discrete fracture events. Applying geometric attributes such as apparent dip, energy gradient, and curvature further delineates these faults and fractures. Mapping fracture intensity and orientation assist delineating sweet spots and aid in planning horizontal wells.

Key words::

• Cuu Long Basin
• fractured basement
• CBM
• seismic attribute