Using common reflection angle migration (CRAM) which is an advanced beam migration, we successfully improved signal-to-noise ratio (SNR) and image continuity in the volcanic reservoir, offshore Myanmar. In this field, seismic imaging is challenging because high impedance contrast at the top of the reservoir attenuates seismic energy, and various kinds of volcanic facies cause complex velocity field. Kirchhoff PSTM was initially applied in this field, but it failed to obtain satisfactory image in the volcanic reservoir. To address these challenges, we applied CRAM with the anisotropic velocity model built by using ray-based reflection tomography. Unlike conventional beam migration algorithms, CRAM enables to extract specular energy via bottom-up ray tracing from each image point, and directly calculate angle domain common image gather (ADCIG). The resulted stacked section of CRAM showed higher SNR and lateral continuity by weighting specular events. The seismic traces of CRAM were better correlated with the synthetic seismogram at wells. The obtained ADCIGs showed more stable behavior and less noise than the conventional offset domain common image gathers (ODCIGs). These improvements are valuable for the following seismic facies analysis and AVO analysis and inversion to characterize complicated volcanic facies.
Presentation Date: Tuesday, October 13, 2020
Session Start Time: 9:20 AM
Presentation Time: 11:25 AM
Location: Poster Station 6
Presentation Type: Poster
