Abstract: Mapping Stratigraphic Traps with Seislogs

R. O. Lindseth

Modern seismic-reflection data may be processed to produce synthetic sonic logs, termed Seislogs. The synthetic logs, which are generated in standard sonic-log parameters of depth and formation transit time, generally correlate well to borehole sonic logs at tie locations.

The ability to obtain closely spaced sonic-type logs without the need to drill boreholes provides several advantages for subsurface exploration. Resolution generally is improved over the conventional seismic method. Facies changes and depositional sequences may be recognized. Direct-depth measurement simplified integration into other subsurface studies.

The method is adapted particularly well to mapping stratigraphic traps. Facies changes are detected by mapping individual rock members within contours of constant-transit time. Comparison of the results of this method to those obtained from the conventional seismic data, from which the Seislogs were derived, clearly demonstrates improved geologic understanding of the subsurface.

AAPG Search and Discovery Article #90968©1977 AAPG-SEPM Annual Convention and Exhibition, Washington, DC