Aulia, Ahmad Nafis and Hasan, Nurudin and Ikhsan, Hanurogo and bagus, sapto (2017) Anisotropic Pre Stack Depth Migration Method for Resolve Fault Shadow on 2D Marine Data. Anisotropic Pre Stack Depth Migration Method for Resolve Fault Shadow on 2D Marine Data.

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Fault shadow often found in areas that has complex geology setting and strong lateral velocity variations make an anomaly such as seismic sag or mistacking, this anomaly will make a mistake in interpretation. The challenge is how to image that condition properly, and we use Pre Stack Depth Migration to resolve fault shadow because it use more accurate model velocity (Interval Velocity), however accuracy of velocity model depends on how accurate we estimate the velocity. To make Velocity more accurate remains a challenge because the real case of subsurface is not only Isotropic but also anisotropic (wave’s propagation depends on direction). In this case we use Vertical Transverse Isotropy (VTI) model for Anisotropic analysis. Some Parameter which is it play the important role to make more accurate velocity estimation are Thomsen’s parameter (delta and epsilon), CIP Pick (RMO), Dip Estimation and Tomography (CIP Diff and Ztomo). The velocity has a good accuracy when the gather is flat and gamma synthetic shows more a little error, after that the final anisotropic velocity is used to depth migration process. The result of PSDM section has improve the image properly at the fault and resolve the mistacking that means we can avoid wrong interpretation.

Item Type: Article
Subjects: Q Science > QE Geology
Divisions: Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User: BAGUS SAPT
Date Deposited: 20 Sep 2019 08:15
Last Modified: 20 Sep 2019 08:15

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