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INTRODUCTION

The past several years have seen steps taken in the application of amplitude variation with offset (AVO) techniques to prestack reflection data. These steps were obviously prompted by an attempt to exploit information contained in the additional dimension and by knowing the theoretic amplitude changes which can occur due to different lithologies and contained fluids. Offsets of 2000 m for both land and marine programs provide sufficient sampling to detect AVO changes, which may be related to change in formation properties. Regardless of source-and receiver-array attenuation effects and of the use of vertical-component receivers on land, the offset dimension can provide more significant information relevant to reservoir and stratigraphic properties than is usually appreciated.

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