Obtaining method of element capture normal spectroscopy in elemental logging

Abstract

The invention provides an obtaining method of an element capture normal spectroscopy in elemental logging. The method comprises steps of model establishment, model checking and the like, and the core of the method is to establish a simulation model according to conditions of carbon-oxygen saturability calibration wells, and then to perform computation through the established simulation model to obtain the element capture normal spectroscopy. The initial simulation model is established according to the calibration wells and the design size of a logging instrument, meanwhile certain structures of the logging instrument are reasonably optimized, and the modeling difficulty is reduced. The part between an inner casing and an outer casing of a vacuum flask is vacuum, the inner casing and the outer casing of the vacuum flask are combined, and vacuum parts of the instrument are combined. An MCNP input card required by modeling comprises a lattice cell card, a curved surface card, a material card and a counting card. The method has the advantages that a large quantity of calibration wells are not required, conventional calibration experiments are only required to be performed in a small quantity of calibration wells, and the cost is low.

Description

technical field [0001] The invention relates to an acquisition method of an element capture standard spectrum in element logging. Background technique [0002] At present, most of the element capture standard spectra used in element logging are measured by instruments in calibration wells filled with pure substances or oxides of certain elements. Measuring the element capture standard spectrum requires the use of a neutron source to activate the substances to be measured in the calibration well to emit gamma rays, and use instruments to measure the capture gamma energy spectra of these substances as the element capture standard spectrum used in element logging. The element capture standard spectrum used in element logging includes silicon, calcium, sulfur, iron, titanium, gadolinium, hydrogen, chlorine and other elements. Obtaining these element capture standard spectra by measurement requires the establishment of a large number of calibration wells, and the construction per...

AI Technical Summary

Problems solved by technology

The element capture standard spectrum used in element logging includes silicon, calcium, sulfur, iron, titanium, gadolinium, hydrogen, chlorine and other elements. Obtaining these element capture standard spectra by measurement requires the establishment of a large number of calibration wells, and the construction period is long , the construction cost is expensive, and it is dangerous to a certain extent, which is not conducive to the promotion of element logging

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