MUKHOPADHYAY, H.N., RAO HEBBARE
Optimally processed seismic data is close approximation of reflection coefficient series of the sedimentary sequences of an area and after appropriate inversion leads to synthetic sonic sections. However, a serious disadvantage in traditional seismic data is its limited vertical resolution due to presence of unrecognizable high frequencies.
Resolution enhancement of seismic data in time and spatial domains is important. Existing seismic (2ms S.I.) methods are restricted within effective band-width, 5-60 Hz only. As a result seismic data has limited vertical resolution capability to delineate thin beds or reservoirs.
A technique is proposed for spectral enhancement of seismic data having a bandwidth of 5-60 HZ to 5-250 Hz using sonic and density logs in wells on or close to the seismic section based on regression and analysis of variance and optimal Filters. Synthetic sonic section is generated by seismic inversion. The technique was applied on seismic data of Bombay offshore area and the results were validated.
This new approach in enhancing vertical resolution of seismic data would assist in reservoir characterization down to log level and thus would help in effective reservoir performance monitoring and modification of injection profiles where heterogeneity and very thin bed alternations pose major problems.
AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria