Assessing shale gas potential through classification of geo-chemical and mechanical properties of reservoir facies in the Upper Devonian shale succession, Liard Basin, Canada

초록

A comprehensive estimation of shale generation/storage capacity (original generative organic carbon (GOCo)) and hydraulic fracturing characteristics (brittleness index (BI)) was conducted in the Upper Devonian shale sequence of the Liard Basin. GOCo was calculated from fraction of type II kerogen inferred from biogenic silica concentrations. BI was estimated from mechanical properties calculated from well-log data. Without well-log data, BI was converted from the relative contribution of biogenic and detrital silica concentrations. Based on GOCo and BI, the shale sequences were divided into four resource facies characteristics were determined to have high hydraulic fracturing efficiency, high organic porosity, and capability to generate large amounts of gas. Considering the vertical tions are estimated as favorable shale gas reservoirs with sum of residual gas volume of both formations in the study wells exceeds 280 bcf/section.

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