Data fusion technique to compute reservoir quality and completion quality by combining various log measurements

A method, comprising:

• normalizing two or more wellbore logs obtained from the output of two or more wellbore tool surveys of a wellbore in a formation of interest to provide two or more normalized wellbore logs;
• inputting the two or more normalized wellbore logs into a correlation matrix;
• assigning each of the two or more normalized wellbore logs a positive or negative sign based on the impact on a selected wellbore quality;
• performing a principal component analysis of the two or more normalized wellbore logs to obtain one or more loading vectors;
• computing weighting factors for each of the two or more normalized wellbore logs from the one or more loading vectors;
• generating a reservoir quality log by linearly combining the two or more normalized wellbore logs using the computed weighting factors;
• generating a completion quality log by linearly combining the two or more normalized wellbore logs using the computed weighting factors;
• preparing a composite reservoir quality index from the product of the reservoir quality log and the completion quality log;
• inputting a user-defined threshold for the composite reservoir quality log;
• designating one or more wellbore intervals in a composite reservoir quality log as regions of interest based on the user-defined threshold;
• and
• transitioning the wellbore to production or completion and producing hydrocarbons from or completing the one or more wellbore intervals designated as regions of interest.