AVO and Seismic Attributes Analysis of OTG Field, Deep Offshore Niger Delta

📄 Project Abstract

Amplitude variation with offset (AVO) analysis was carried out on OTG field, deep offshore Niger Delta for the purpose of predicting gas in the reservoirs. Exploration for oil and gas are being shifted to more complex and difficult terrain such as the deep offshore, quantitative studies such as AVO analysis are needed to reduce exploration risks associated with this environment. The dataset used for this study includes 3D seismic pre-stack migrated data with near and far offset gathers, full stack 3D seismic and composite well logs including compressional and shear sonics. Methods adopted involved the correlation of wells, generation of synthetic seismograms, surface attribute analysis, estimation of rock attributes, AVO modelling and classification of AVO anomaly type for subsequent prediction of fluids saturating the reservoir. Surface attributes analysis showed amplitude anomalies on the surface around the well tops indicating possible gas distribution. Cross plots of estimated rock...