Universal Journal of Physics and Application Vol. 12(1), pp. 1 - 10
DOI: 10.13189/ujpa.2018.120101
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Near-surface Seismic Velocity Model Building from First Arrival Travel-times - A Case Study from an Onshore, Niger Delta Field


Opara, C. , Adizua, O. F. *, Ebeniro, J. O.
Applied Geophysics Research Group, Department of Physics, University of Port-Harcourt, Nigeria

ABSTRACT

Seismic refraction was used to image the near-surface, using a3D seismic data acquired from an onshore Niger Delta field. The objective of the study was to build a near-surface model of the earth in terms of sub-weathering layer thicknesses and seismic wave velocities and highlight the near-surface seismic wave velocity variation in the region. A velocity-depth model consisting of the weathering layer and three consolidated (sub-weathering) layers was first estimated. The first-breaks were picked and used as input for this study. The models were generally consistent in terms of their large-scale features, demonstrating the robustness of refraction data inversion in general. Results support confidence in the reliability and robustness of the refraction inversion method. The method of analysis and resolution for 3-layer models adopted in this study may be used in resolving such cases observed during processing of seismic reflection data from the Niger-Delta Basin.

KEYWORDS
Seismic Refraction, Near-surface Earth Model, Velocity Depth Model, First Breaks, Refraction Data Inversion, Niger Delta Basin

Cite this paper
Opara, C. , Adizua, O. F. , Ebeniro, J. O. . "Near-surface Seismic Velocity Model Building from First Arrival Travel-times - A Case Study from an Onshore, Niger Delta Field." Universal Journal of Physics and Application 12.1 (2018) 1 - 10. doi: 10.13189/ujpa.2018.120101.