Seismic Sequence Analysis by Frequency Transition: A Case Study from the Himalayan-Tibet Areas.

Frequency contents of a seismic trace, varying with time carry information about the properties of the subsurface reflectivity sequence. In this paper, frequency transition technique for the reflection sequence analysis of the seismic data has been presented. The technique is the extension of the frequency attributes representation of seismic data. Frequency attributes, separate display of the seismic time amplitude maps, are computed with complex trace analysis. Moderate and sharp frequency variations are found all over the traces with time. Sharp frequency variations and the time of appearance are termed as transition frequency and transition time respectively. Transition-factor (T-factor) has delineated for marking the sharp frequency variation in the time frequency plots. T-factor differentiates high, moderate and transition frequency variations. The technique is explained with examples and has been applied for studying the reflection sequences of the INDEPTH seismic data. The proposed seismic reflection analysis can be used to identify the strata by sequence stratifying the seismic data. [ABSTRACT FROM AUTHOR]