Depth Migration Velocity: Differential Semblance Analysis for Sumatra Forearch Basin
Penulis/Author
Adam Sukma Putra, S.Si., M.Si. (1); Prof. Dr. Sismanto, M.Si. (2); Idham Syah Alam, S.Si., M.Sc., Ph.D. (3)
Tanggal/Date
2019
Kata Kunci/Keyword
Abstrak/Abstract
Abstract. The specific goal of this work is to present a complete velocity map obtained by
picking the velocity in Common Image Gather (CIG) map. We simulated a shot gather in order
to obtain a synthetic travel time data for depth analysis. We successfully determined the correct
migration velocity and presented the velocity interval model. For further study, we also
conducted a Semblance analysis in order to obtain a coherency panel between the energy and the
depth migration velocity analysis. We successfully interpreted the conventional semblance
profile that the correct velocity model maximizes that energy which is represent higher value.
For the real case, The data set was acquired by CGGVeritas in 2009 of RMS velocities recorded
in 48 CMP points. The results of the semblance analysis shows well coherence with the seismic
reflectance data that reveals the Low Velocity Zone of Sumatra fault related to the present of
fluid and gas.
