Abstract
In shale oil/gas exploration, using the Brittleness Index to identify sweet spots has become standard. This practice may incur inaccuracies when done inappropriately. This work used basic statistics and scatterplot analyses to identify trends and performance of four brittleness indexes. In the results, the indexes seemed similar in the well-logs with higher values in sandstone lithologies. The sensitivity to the parameters such as Total Organic Carbon, Porosity and Mineralogy, and fluid content varied among the indexes. The relation of the brittleness to the rock properties is mostly linked to the design features of the indexes. Brittleness Index selection should be done considering that some properties can affect the values positively or negatively. This work explains the brittleness index application more practically regarding the basic considerations to be included in shale plays evaluation.
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