3D SEISMIK SURVEY DESIGN MODELING IRREGULAR AND SPARSE SHALLOW TARGET FOR MONITORING

• Main Author: Tarigan, Ronald
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86272
• Institution: Institut Teknologi Bandung

3D seismic surveys are essential tools in hydrocarbon exploration, reservoir evaluation, and monitoring (EOR & CCS). Monitoring surveys are characterized by limited areas and specific targets, requiring an efficient design with minimal costs, especially in areas with complex geology and restricted access. Irregular and sparse survey designs offer a more efficient solution compared to regular designs, with asymmetric data placement and fewer data points. This study evaluates a 3D irregular and sparse seismic survey design over an area of 0.5 × 0.5 km² with a target depth of ±500 m for experimental surveys and subsurface binning simulations on a different survey. Simulations using MESA Expert show that regular designs produce consistent fold and offset distributions, while irregular and sparse designs yield adequate but uneven fold distributions, with dominance in certain in-line directions. The offset distribution is also irregular across each bin grid, but the azimuth variation is greater than that of regular designs. Subsurface binning modeling, ray tracing, and synthetic seismogram generation indicate that this design meets survey objectives with good fold and offset distribution. Significant differences between the CMP fold and CRP fold are observed in horizons with complex geology. This design also produces representative seismic stack sections; however, migration results still show swing effects due to aperture limitations caused by insufficient offset length in the latest survey design.