Combination of Different Shallow Refraction Seismic Interpretation Methods Into One Method
Hamdy H. Seisa
University of Mansoura, Egypt.
Contacts: hseisa@mans.edu.eg (Hamdy H. Seisa)
Abstract
This investigation represents an attempt to combine different interpretation methods of shallow refraction seismic data into one method. The application of the most conventional interpretation methods of the subsurface with a piece-wise lateral changes in velocity or in dip are usually troublesome. The interpretation difficulties arises from the implication of finding certain points on the first arrival traveltime curves, known as common refractor (CRP) or common surface points (CSP). Moreover, there are no constant values that can be used for detailed and accurate interpretation of refraction seismic data resulting from such structures.As a fact, the slope of any traveltime element is absolutely independent of the position of the refractor segment and depends mainly on the critical angle and the dip angle from which it is refracted. The first arrival time values on the traveltime curve are affected only by the lateral variations along the refracting interfaces (refractor segments).
In this study, the traveltime data will be migrated to get the true position of the first arrivals and to eliminate the error resulting from the lateral variations. By the use of this technique, all interpretation methods can be applied again to map the actual subsurface structure in cases of piece-wise lateral variations.
raeg2003@tansa.kumst.kyoto-u.ac.jp
Last modified: Wed Dec 04 13:49:54 2002