Instantaneous frequency is widely used for identifying specific seismic events, such as abnormal attenuation and thin bed tuning, based on its frequency content. It is one of the important seismic attributes related to the complex seismic trace. Although the definition itself is clear in theory, in practice the calculation can vary considerably, and deviate from the theoretical aim. Despite several decades since it occurred, there is still little consistency in the calculations of instantaneous frequency. We thus propose a robust and reliable scientific process to objectively compare various implementations of instantaneous frequency. To this end, through theory deduction and a physical model illustration, a complicated synthetic test dataset based on two oscillating function combinations, with varying frequencies and amplitudes, is generated. Correspondingly, its ‘ground truth’ instantaneous frequency is calculated by the analytic formula. In addition, several issues and weaknesses of current instantaneous frequency computations are pointed out and are considered in proposed quality metrics. Preliminary tests with quantitative and qualitative results show the effectiveness of the synthesized dataset and quality metrics for instantaneous frequency evaluations. Thereby, the benchmarking process may eventually improve the quality of instantaneous frequency algorithms throughout the industry.
Presentation Date: Wednesday, September 27, 2017
Start Time: 2:15 PM
Presentation Type: ORAL