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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


25th Annual Convention Proceedings (Volume 1), 1996
Pages 385-391

2-D and Previous Hit3-DNext Hit Prestack Depth Migration for Complex Geologic Structures Previous HitOffshoreNext Hit Previous HitIndonesiaNext Hit

M. Murphy, R. Ottolini, R. Estill, E. Lumadyo, M. Mathias

Abstract

Unocal Previous HitIndonesiaNext Hit is using Previous Hit3-DNext Hit prestack depth migration to better image Indonesian prospects in difficult Previous HitseismicNext Hit areas. The goal is to delineate the deep fault geometry beneath image-distorting carbonates. Previous 2-D prestack depth migration has resulted in significantly better Previous HitstructuralNext Hit imaging, which is motivating the Previous Hit3-DNext Hit work.

Lateral velocity variations of 2 to 3 km/s within distances of less than 1 km make conventional time migration methods inadequate to accurately image structures and faulting. Iterative 2-D depth migration has provided better Previous HitstructuralNext Hit imaging in depth due to more accurate interval velocities and Previous HitstructuralNext Hit geometry resolution. Previous Hit3-DNext Hit prestack depth migration provides better migration velocity analyses and superior Previous HitstructuralNext Hit imaging, especially in comparison to 2-D lines acquired in directions oblique to major faults.

The most important step in depth migration is construction of a Previous Hit3-DNext Hit interval velocity model. All available Previous HitdataNext Hit are used in constructing the model: Dip Moveout (DMO) stacking velocities, poststack time migration, well logs, check-shot surveys, gravity and magnetic Previous HitdataNext Hit, Previous HitseismicNext Hit interpretations, and the Previous Hit3-DNext Hit prestack depth migration velocity analyses. The model is developed iteratively Previous HitfromNext Hit the surface downward. Modeling packages such as GOCAD assist the Previous HitdataNext Hit integration and Previous Hit3-DNext Hit visualization quality control. The Previous Hit3-DNext Hit migration algorithm is a Unocal proprietary Kirchhoff migration with ray - trace traveltimes and migration computed on a 3 Gigaflop, 10 CPU Silicon Graphics Power Challenge.


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