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Avo analysis is a technique by which geophysicists attempt to determine thickness, porosity, density, velocity, lithology and fluid content of rocks. Successful avo analysis requires special processing of seismic data and seismic modeling to determine rock properties with a known fluid content. The amplitude versus offset (avo) phenomena on seismic data can provide substantial exploration and development information. Under good conditions the information extracted can be as detailed as an elastic layered model of the earth in the vicinity of the exploration or development target. To accomplish this goal, a systems approach to the problem is used. Avo analysis amplitude variation with angle or offset ava avo behaviour in pre-stack seismic gathers is a classic direct hydrocarbon indicator (dhi) based on the principle that variations in amplitude of a seismic reflection with angle of incidence or source-receiver distance (offset) are caused by fluid andor lithology changes in the reservoir. Today, avo analysis is widely used in hydrocarbon detection, lithology identification, and fluid parameter analysis, due to the fact that seismic amplitudes at the boundaries are affected by the variations of the physical properties just above and. Again, data suitable for avo analysis are generally associated with near-horizontal earth models or low-relief structures. Hence, use of a single, vertically varying velocity function and a zero-offset phase-shift algorithm for common-offset migration often is appropriate.

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