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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


14th Annual Convention Proceedings (Volume 2), 1985
Pages 439-467

Refraction Previous HitStaticsNext Hit, A Comparison Among Processing Contractors

Bambang Sudewo

Abstract

Previous HitStaticsNext Hit play an important role in land seismic processing. They affect velocity analysis, reflection continuity, resolution and apparent structure.

When Previous HitstaticsNext Hit supplied from the field are inadequate, refraction Previous HitstaticsNext Hit are necessary to rectify the problem. Inadequacy of the field Previous HitstaticsNext Hit could be due to various field conditions such as shot-depth, fast lateral changes in weathered layer thickness and velocity, the inherent limitations of the uphole method and so on.

The key to successfully resolving these problems in applying any refraction Previous HitstaticsNext Hit program is to properly pick the first breaks coming from refracted raypaths, then build a near-surface model to calculate vertical transit time.

Various techniques from various processing companies are used in picking the first breaks. These range from enhancing the first breaks display to interactive computer-aided picking.

In building near-surface models many methods are used. Some programs build a simple one layer model while other programs can create and handle more complex models. Accuracy in determining both weathered layer and refractor velocities has a considerable influence on the Previous HitstaticsNext Hit computations.

This paper details the results of processing a line with known significant Previous HitstaticsTop problems using several contractors.


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