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A Method for Applying Amplitude Inverse Q that Preserves Amplitude Variations with Offset
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
For many years inverse Q has been applied to poststack data as a means of enhancing the temporal resolution of a dataset thus improving its interpretability. Typically, the problem encountered is that the high-frequency noise tends to be boosted too much. The amount of gain (boosting) applied can be limited to keep the signal-to-noise ratio within acceptable limits for a given frequency range. Many applications of inverse Q have parameters such a reference frequency for gain control and gain limit to restrict the boosting done at the higher frequencies. More recently, inverse Q has been applied to gathers after prestack-time migration and these gathers have been used to produce full-fold and angle stacks with the aim of doing amplitude versus offset (or angle) work on these datasets. By means of a simple synthetic event it is shown here that when a gain limit is used within the inverse Q then the amplitude variation with offset is distorted. The Q application method described here prevents such distortion.