Patent Document ID: 9874551
Application ID: 14211751
Patent Status: 1

Claim One:
1. A method for determining mineralogy of rock comprising: lowering an elemental spectroscopy logging tool into a borehole penetrating the rock; irradiating the rock with neutrons emitted by the elemental spectroscopy logging tool; measuring gamma rays from the rock resulted from said irradiating; determining a model of arenites in the rock by using a processor to perform a first type of linear regression on a plurality of elemental dry weights of the rock based upon a sum of elemental dry weights of calcium and magnesium being at least a given value, or perform a second type of linear regression on the plurality of elemental dry weights based upon the sum of the elemental dry weights of elemental calcium and magnesium being less than the given value; determining a model of arkoses in the rock, by performing a third type of linear regression on the plurality of elemental dry weights, using the processor; determining a partitioning function, using the processor; and determining the mineralogy of the rock by using the processor to apply the partitioning function to the model of arenites and the model of arkoses, and add the model of arenites and the model of arkoses together to create a combined model; using the determined mineralogy of the rock in a drilling, simulation, or completion, operation on the wellbore penetrating the rock.