method for obtaining a pulsed neutron-induced gamma ray response that is substantially free of sensitivity to the hydrogen index of a formation and related to the atom density / electron density weighted in the inelastic cross section of the formation for formation evaluation, and apparatus to obtain a pulsed neutron-induced gamma ray response that is substantially free of sensitivity to the hydrogen index of a formation and related to the inelastic cross-section weighted atom density / electron density for formation evaluation

摘要

A method of formation evaluation using a pulsed neutron tool. The approach removes the effect of formation hydrogen index (HI) from the nuclear response of the tool. It can be used for gas detection and quantification, as well as for other fluids. It can also be used to improve a formation hydrogen index (HI) measurement.