In this paper we try to discriminate lithologies by conventional AVO analysis and AIGI crossplot in a Cambro-Ordovician reservoir in Algeria. We use different AVO products including angle stacks and intercept / gradient data, and carry out analysis in both reflectivity and impedance domains. Results from angle stacks and intercept / gradient could be compared directly in the extended elastic impedance domain. Well log processing and analysis results are used to calibrate the seismic prediction. We find the result from intercept and gradient is better than that from angle stacks due to scaling issue in the far angle stacking. The apparent separation between the sand and the shale is an encouraging result that suggests AIGI crossplot can be used as a robust tool for lithology prediction and an aid to AVO analysis and calibration.


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