REFINED LITHOLOGY CURVE

摘要

A method for estimating a property of an earth formation penetrated by a borehole. The method includes: conveying a natural radiation detector through the borehole and measuring natural radiation emitted from the earth formation to provide natural radiation data; conveying a neutron source through the borehole and irradiating the earth formation with neutrons; measuring neutron-interaction radiation emitted from the earth formation due to the irradiating with at least one neutron-interaction radiation detector to provide neutron-interaction data; conveying a borehole image logging tool through the borehole and measuring a resistivity of the earth formation by transmitting electrical current or electromagnetic energy into the earth formation and receiving an electrical signal associated with the resistivity due to the transmitting to provide resistivity data; and combining the natural radiation data, the neutron-interaction radiation data, and the resistivity data into one data set as a function of depth to estimate the property.