Method for Filtering for Interpretation of Neutron Induced Gamma Ray Measurements

摘要

A method for analyzing a formation includes entering into a computer a number of detected gamma rays resulting from imparting neutrons into the formation. The detected gamma rays are characterized by energy levels thereof. A number of detected gamma rays in each energy level comprises a measured spectrum. In the computer, a non-Gaussian filter is applied to a reference spectrum to match the measured spectrum in shape. The filtered reference spectrum and measured spectrum are used to determine a fractional volume of at least one component of the formation.

主权项

1. A method for analyzing a formation, comprising:
entering into a computer a number of detected gamma rays resulting from imparting neutrons into the formation, the detected gamma rays characterized by energy levels thereof wherein a number of detected gamma rays in each energy level comprises a measured spectrum; in the computer, applying a non-Gaussian filter to a reference spectrum to cause the measured spectrum to match the reference spectrum in shape; and in the computer, using the filtered spectrum and measured spectrum to determine a fractional volume of at least one component of the formation.