Formation Evaluation in the Devonian Shale

Abstract

ABSTRACT A Devonian shale – specific geophysical log interpretation model was developed to extract as much geological and reservoir data as possible from a suite of air- or gas-filled-hole logs. Development of the methodology and evaluation of the geological and reservoir properties was supplemented with core data, formation tests, mud logging data, temperature logs and borehole TV logs acquired in Devonian shale wells. This new analysis technique improves the identification of hydrocarbon bearing intervals and the types of formations associated with production. As a result, the analysis when combined with other data, allows a more effective selection and treatment of the hydrocarbon productive intervals. Examples are shown which compare the computed lithology and porosity with core measurements. The computed results are also compared to mud logs; noise logs; temperature logs; borehole television data; production logs; and production tests.