Method and device for determining stratum mineral content

Abstract

The invention provides a method and device for determining stratum mineral content. The method comprises the following steps: acquiring a hybrid Gamma-ray spectra produced by the nuclear reaction of multi-elements in a to-be-detected stratum with fast neutrons; decomposing the hybrid Gamma-ray spectra to obtain relative yield of each element in the multi-elements in the to-be-detected stratum; computing to obtain the content of each stratum mineral in multiple stratum minerals in the to-be-detected stratum according to the relative yield of the element and a preset quantitative relation, wherein the quantitative relation is the quantitative relation between the relative yield of single element and the content of the stratum mineral containing the single element. The quantitative relation between the relative yield of single element and the content of the stratum mineral containing the single element is established by the method in the embodiment of the invention, thereby directly computing the contents of different stratum minerals in the to-be-detected stratum through the relative yield of the element, the computing precision of the stratum mineral content is effectively improved, and the accuracy of the computation result of the stratum mineral content is guaranteed.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and a device for determining the mineral content of formations. Background technique [0002] Mineral content of strata is of great significance in lithology identification, clay content evaluation, skeleton parameter calculation and depositional environment research. [0003] At present, the commonly used determination methods of formation mineral content are mainly divided into two types: the first method is to establish the relationship equation between the formation mineral content and different logging response values ​​according to the logging response characteristics of different formation minerals, and use the optimization method Obtain formation mineral content; the second method is to use the element content obtained from formation element logging, and according to the element components in formation minerals, establish a relational equation betw...

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Problems solved by technology

[0004] However, both methods have certain drawbacks

The first method is to use the logging curves of different formation minerals to indirectly determine the formation mineral content, and the calculation results of the formation mineral content determined by this method are not high; the second method is to use the element content obtained from the formation element logging to directly However, when using this method to determine the mineral content of the formation, there will be errors in the process of converting the relative yield of elements obtained from the gamma spectrum analysis in the formation element logging to the element content, which will lead to The error is transmitted to the determined formation mineral content result, and the accuracy of this method needs to be further improved

[0005] For the above problems, no effective solutions have been proposed so far

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