Unlocking Shallow Play Potential by Implementing Frequency-dependent AVO attribute, East Java Basin
Author: Anwar Sadat, Haryono Haryanto, Hotma Yusuf
The current improvements in the application of spectral decomposition have been intensively focused on direct hydrocarbon detection rather than structural interpretation. Current studies about hydrocarbon related frequency effects are predicted to be detectable on stacked seismic data. Furthermore, it has been suggested that low frequencies tend to show the highest sensitivity to fluid changes. Several studies have also shown evidence that hydrocarbon reservoirs have an amplitude-versus-offset (AVO) frequency dependence. There could be a correlation in frequency and variation amplitude with offset. Hydrocarbon bearing reservoir is indicated by frequency attribute which show the dispersion and attenuation related hydrocarbon presence and AVO which show the greatest changing amplitude with offset variation. This paper intended to understand frequency anomaly in offset variation and to measure potential links between frequency and AVO effect related to hydrocarbon bearing gas sand reservoir and the application in revealing overlooking shallow hydrocarbon play potential. The Authors performed AVO effect prediction in several frequencies, then get the sensitivity of frequency and amplitude changing with offset variation related hydrocarbon presence in gas sandstone reservoir. The final product described gas sandstone reservoir in shallower play potential. Our trial on 3D seismic new reprocessed year of 2018 in East Java Basin shows the sensitivity of frequency dependent AVO in gas sand reservoir enable us to identify the interesting new hydrocarbon reservoir response.
Keyword: Frequency dependent AVO, attenuation factor, hydrocarbon reservoir, new shallow play potential
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