Application of Statics Correction in the Processing of 3D Seismic Data from Onshore Niger Delta

摘要

Statics correction was applied to a 3D seismic data acquired from an onshore Niger- delta field. The objective of the study was to derive a statics solution, which will correct for time shifts caused by topographic undulations, velocity anomalies in the near-surface and delayed travel times of the reflection signal through the weathered layer. In a previous study by authors, a near-surface seismic velocity and depth model, consisting of the weathering layer and three consolidated (sub-weathering) layers were first estimated. The first-arrivals were picked and used as input for this study. Statics correction consisting of elevation statics, long-wavelength refraction statics, and short-wavelength (residual statics) refraction statics was applied to the data. Interpretation of results show like differences such as a stronger alignment and coherence of reflection events, as well as an upward time shift of the reflection signals when compared with the input data (no statics applied) and the output data (statics applied).