公开(公告)号：US11313223B2

公开(公告)日：2022-04-26

申请号：US16470539

申请日：2018-12-10

Applicant: PETROCHINA COMPANY LIMITED

Inventor： Hongliang Wu ,  Ning Li ,  Zhou Feng ,  Changlin Lan ,  Tao Lv ,  Kewen Wang ,  Qingfu Feng

IPC: G01V5/12 ,  E21B49/00 ,  G01V5/10

Abstract: A gamma ray spectrum unfolding method for elemental capture spectroscopy logging and a device therefor including the steps of first preprocessing the data obtained from an elemental capture spectrometry instrument; constructing a primary element group and an auxiliary element group according to the degree of interactions among the elements via theoretical analysis and numerical calculation of spectrum profiles, characteristic peak channels, and backgrounds of different elements; unfolding by using the least square method based on the construction of the primary element group and the auxiliary element group; and finally reconstructing the spectrum based on theory according to the yield of each element obtained by unfolding with the least square method, and comparing the measured gamma ray spectrum with the reconstructed gamma ray spectrum for error control, thereby improving the spectrum unfolding precision.