Inelastic scattering gamma spectrum analysis method and device

Abstract

The invention provides an inelastic scattering gamma-ray spectrometry analysis method and device. The method comprises the steps as follows: inelastic mixed spectrum and capture spectrum are measuredin a neutron pulse cycle and subjected to normalization processing; the normalized capture spectrum is added to an element first inelastic standard spectrum matrix obtained in advance, and an elementsecond standard spectrum matrix corresponding to the capture spectrum is obtained; the inelastic mixed spectrum is analyzed through the element second standard spectrum matrix, and contribution ratesof elements and the normalized capture spectrum for the inelastic mixed spectrum are obtained; the contribution rates of all the elements for the inelastic mixed spectrum are normalized, and inelasticspectrum relative yields of all the elements are obtained. Pure inelastic spectrum is not required to be obtained firstly during measurement of inelastic spectrum relative yields of all the elements,so that the defect of inaccurate underground stratum oil saturation due to defects of a fixed pure spectrum coefficient method which is mainly adopted at present can be overcome.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to an inelastic scattering gamma energy spectrum analysis method and device. Background technique [0002] Unconventional oil and gas resources play an increasingly important role in my country's energy structure and have become a key area of ​​exploration and development. Well logging is required during the exploration and development of oil and gas field resources, so that the staff can know the oil saturation of the downhole formation in time, so as to facilitate the subsequent exploitation of the oil field. [0003] In order to accurately obtain the oil saturation of the formation, the pulsed neutron source earth element logging is generally used in the prior art to determine the inelastic yield of the elements in the formation, and the oil saturation of the formation is calculated according to the inelastic yield of the elements in the formation , when using the above me...

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Problems solved by technology

[0005] The present invention provides a method and device for inelastic scattering gamma energy spectrum analysis, which is used to solve the problem of elemental inelastic relative yield due to the need to obtain pure inelastic spectrum in the prior art. Inaccurate yield and dry weight defects

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