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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 3-D Prestack Previous HitDepthNext Hit Migration for Complex Geologic Structures Offshore Indonesia

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

Abstract

Unocal Indonesia is Previous HitusingNext Hit 3-D prestack Previous HitdepthNext Hit migration to better image Indonesian prospects in difficult seismic areas. The goal is to delineate the deep fault geometry beneath image-distorting carbonates. Previous 2-D prestack Previous HitdepthNext Hit migration has resulted in significantly better structural imaging, which is motivating the 3-D work.

Lateral Previous HitvelocityNext Hit 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 Previous HitdepthNext Hit migration has provided better structural imaging in Previous HitdepthNext Hit due to more accurate interval velocities and structural geometry resolution. 3-D prestack Previous HitdepthNext Hit migration provides better migration Previous HitvelocityNext Hit analyses and superior structural imaging, especially in comparison to 2-D lines acquired in directions oblique to major faults.

The most important step in Previous HitdepthNext Hit migration is construction of a 3-D interval Previous HitvelocityNext Hit model. All available data are used in constructing the model: Previous HitDipNext Hit Moveout (DMO) stacking velocities, poststack time migration, well logs, check-shot surveys, gravity and magnetic data, seismic interpretations, and the 3-D prestack Previous HitdepthNext Hit migration Previous HitvelocityTop analyses. The model is developed iteratively from the surface downward. Modeling packages such as GOCAD assist the data integration and 3-D visualization quality control. The 3-D 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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