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Fission neutron well logging correction method

A fission neutron and logging technology, which is used in surveying, earth-moving drilling, wellbore/well components, etc., and can solve problems such as the impact of accurate calculation of uranium resources

Active Publication Date: 2014-10-01
核工业航测遥感中心
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Problems solved by technology

At present, there is no correction method for fission neutron logging, and the effective correction of fission neutron logging cannot be realized, which will affect the accurate calculation of uranium resources

Method used

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  • Fission neutron well logging correction method

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Embodiment Construction

[0048] A kind of fission neutron logging tool correction method of the present invention is introduced below in conjunction with accompanying drawing and embodiment:

[0049] Such as figure 1 As shown, a fission neutron logging tool calibration correction method, the specific steps are as follows:

[0050] Step 1. Obtain the corrected count rate of the neutron monitor in the measured wellbore

[0051] The neutron count rates S1 and S2 of the measured wellbore along the well axis and close to the borehole wall are respectively collected by the fission neutron instrument, and the neutron count rates S1 and S2 of the fission neutron instrument are respectively collected along the well axis and close to the borehole wall in the measured wellbore. The difference between the neutron count rates recorded by the two neutron monitors MON1 and MON2 △M 1 and ΔM 2 ; In the standard device of the fission neutron logging model, the neutron count rate difference ΔM recorded by the two neu...

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Abstract

The invention relates to a fission neutron well logging correction method, which comprises the following steps that: 1, a correction counting rate of a neutron monitor of a tested wellhole is obtained; 2, a water correction factor is obtained; 3, the neutron counting rates near a well wall and along a well axis after the water correction in a tested well are obtained; and 4, the neutron counting rates near the well wall and along the well axis after the epithermal neutron service life correction in the tested well are obtained. The method provided by the invention can be used for directly measuring the uranium content. Compared with drill hole rock core sampling chemical analysis results, the method has the advantages that the deviation does not exceed 10 percent. The uranium ore grade is more objectively reflected; particularly in sections with damaged uranium-radium balance, conventional gamma well logging is combined, and a uranium-radium balance factor of a drill hole ore block can be determined in site; and the rock core sampling quantity is reduced, and the uranium resource investigation cost is reduced. The method can be used for accurately measuring the uranium leaching rate in mining using the leaching technology, avoids the environment pollution and the cost waste due to unquestioning excessive liquid injection in the process of the mining using the leaching technology, and has important practical significance on improving the efficiency of the mining using the leaching technology, reducing the cost and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of nuclear and radiation environment monitoring and measurement, and in particular relates to a correction method for calculating the remaining uranium resources of a fission neutron logging instrument for uranium ore exploration reserves and in-situ leaching mining and smelting. Background technique [0002] Fission neutron logging technology belongs to the logging technology of direct uranium logging. This technology began in the 1970s, including prompt neutron logging technology and delayed neutron logging technology. By the mid-1970s, prompt neutron logging tools and delayed neutron logging tools had been widely used in uranium exploration in the world, and their sensitivity for detecting uranium was as high as 10 -4 g / g, reaching the lowest recoverable industrial grade for exploration of in-situ leachable sandstone-type uranium deposits. [0003] At present, gamma logging is often used for uranium reso...

Claims

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Application Information

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IPC IPC(8): E21B47/00
Inventor 张积运江民忠管少斌胡明考李峰林张长兴王新兴周宗杰张家秋刘峰刘健王军高惠
Owner 核工业航测遥感中心
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