A simple review of amplitude variation with offset (AVO) analysis as a direct gas indicator (DGI). – O. O. Olagundoye, C. S. Okereke, E. U. Egeh and D. A. Obi
A major risk in the use of the Bright Spot Technique in natural gas detection is the possibility that the anomalous amplitude zone or bright spot identified on seismic reflection data may contain little or no gas. This is because igneous intrusions, carbonate or hard streaks, coal beds, and wet sands often show up on seismic data as bright spots. The anticipated impact of any sudden shortage of oil and/or gas on economies and way of life underscores the value of effective hydrocarbon exploration around the world. Currently, strong gas prices and increases in global gas consumption, and the trend towards the much talked about ‘methane age’ have led to a focusing of oil industry attention on gas exploration opportunities and more efficient gas detection technologies. One of such technologies is AVO analysis; a seismic analysis technique that searches for direct gas indications using the amplitudes on pre-stack seismic data. In this presentation, we present a simple review of the AVO technique with the aim of providing a framework for easy and better understanding of this seismic interpretation technique as a technology in the direct identification, and appraisal of gas prospects.