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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 Previous HitPrestackNext Hit Depth Previous HitMigrationNext Hit for Complex Geologic Structures Offshore Indonesia

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

Abstract

Unocal Indonesia is using Previous Hit3-DNext Hit Previous HitprestackNext Hit depth Previous HitmigrationNext Hit 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 Previous HitprestackNext Hit depth Previous HitmigrationNext Hit has resulted in significantly better structural 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 Previous HittimeNext Hit Previous HitmigrationNext Hit methods inadequate to accurately image structures and faulting. Iterative 2-D depth Previous HitmigrationNext Hit has provided better structural imaging in depth due to more accurate interval velocities and structural geometry resolution. Previous Hit3-DNext Hit Previous HitprestackNext Hit depth Previous HitmigrationNext Hit provides better Previous HitmigrationNext Hit velocity analyses and superior structural imaging, especially in comparison to 2-D lines acquired in directions oblique to major faults.

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


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