Due to the shielding and absorption of volcanic rocks, the reflection of their underlying subsurface formations is weak, which poses great challenges to the implementation of underlying structures and reservoir prediction. For this reason, this paper proposes a five-parameter generalized S-transform method for the compensation of volcanic rock underburden. This method will quantitatively analyze the energy shielding caused by volcanic rock through the comparison of well seismic calibrations. The ratio of volcanic rock amplitude in the reference frequency band to the amplitude of the underlying formation is used as a threshold. By introducing a five-parameter generalized S-transform, the energy attenuation of the underlying formation is compensated in the time-frequency domain. This method fully considers the influence of special geologic bodies on the reflection amplitude of the underlying formation and eliminates it, and improves the reliability of the amplitude compensation by introducing drilling information to ensure the true reflection of the underlying formation. Frequency division compensation is more in line with the actual attenuation characteristics of different seismic wave propagation. The effectiveness of this method was verified by the practical application of oilfield in Bohai.
Note: This paper was accepted into the Technical Program but was not presented at the 2020 SEG Annual Meeting.
