GAMMA ENERGY SPECTRUM UNFOLDING METHOD AND APPARATUS FOR ELEMENT CAPTURE ENERGY SPECTRUM LOGGING

摘要

A gamma energy spectrum unfolding method and apparatus for element capture energy spectrum logging. The spectrum unfolding method comprises: firstly, pre-processing data acquired by means of an element capture energy spectrum logging instrument; then, constructing a main element group and an auxiliary element group; then, based on the construction of the main and auxiliary element groups, using a least square method to carry out spectrum unfolding; and finally, carrying out energy spectrum reconstruction according to yields of various elements obtained according to the least square method, and comparing a measured gamma energy spectrum with a reconstructed gamma energy spectrum to carry out error control. Correspondingly, the spectrum unfolding apparatus comprises a data collection and main element type determination module (101), an element capture gamma energy spectrum logging data pre-processing module (102), a main element group and auxiliary element group construction module (103), an element group-based least square method spectrum unfolding module (104) and a gamma energy spectrum reconstruction and error control module (105). The gamma energy spectrum unfolding method and apparatus for element capture energy spectrum logging both have the advantages of high precision and strong operability, have good universality for different types of reservoirs, and provide important reference and lessons for the processing of neutron gamma energy spectrum data of other types of instruments.