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A multi-company DHI consortium led by Rose & Associates has developed the Seismic Amplitude Analysis Module (SAAM) to better characterize the prospect reserve uncertainty and probability of geologic success associated with all AVO Class seismic amplitude anomalies.

SAAM guides the analyst through a comprehensive interview process, that includes:

• initial characterization of the amplitude anomaly from regional and local geologic criteria to define a starting Pg and initial prospect reserves variance;
• description of the seismic and relevant well data that is weighted and scored for adequacy; and
• detailed characterization of over 30 amplitude attributes, including pitfalls.

The amplitude characterization score is modified by the seismic data and well data adequacy to calculate a revised prospect Pg and reserves variance. Over 100 prospects are now included in the software database that is used to calibrate the data quality weighting factors and anomaly characteristics. 

The software features drop-down menus, check boxes and other forms controls to make the analysis process as fast and as error-free as possible. In addition, for many of the key characteristics, the geoscientist selects a score from a calibrated list of five grades for each attribute. Attributes that do not apply to the amplitude anomaly under study can be eliminated from the total score.

A unique and important part of the software is the archival capabilities for comparisons and subsequent performance tracking.

The Phase I through Phase III Consortium members include: Anadarko, Apache, Burlington Resources, Devon Energy, Dominion, EEX, Enterprise, Hunt Petroleum, JNOC, Kerr McGee, Marathon, Newfield, Nexen, Noble Resources, Ocean Energy, Phillips Petroleum and Repsol/YPF/Maxus, Samson, Shell, Spinnaker, Unocal and Westport.

Special direction was provided by Mike Forrest (former Shell and Maxus manager, commonly referred to as the "father of DHI analysis") and Professor John Castagna (University of Oklahoma), a recognized expert on rock property analysis and AVO characterization.