Implementation of the direct demodulation method for natural gamma ray spectral logging

LIU Zun-Nian; SUN Jian-Meng; WANG Jin-Liang; REN Ai-Ge

doi:10.1088/1674-1137/38/4/046203

Chinese Physics C> 2014, Vol. 38> Issue(4) : 046203 DOI: 10.1088/1674-1137/38/4/046203

Implementation of the direct demodulation method for natural gamma ray spectral logging

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Abstract：
Spectrum analysis of natural gamma ray spectral logging (SGR) data is a critical part of surface information processing systems. Due to the low resolution, which is an inherent weakness of SGR, and the low signal-to-noise ratio problem of logging measurements, SGR is usually treated with a low confidence level. The Direct Demodulation (DD) method is an advanced technique to solve modulation equations interactively under physical constraints. It has higher sensitivity and spatial resolution than the traditional methods and can effectively suppress the logging noise. Based on standard count rate spectral data obtained from the China Offshore Oil Logging Company SGR Calibration Facility, this paper presents the application of the DD method to gamma-ray logging. The results are compared with four traditional algorithmic methods, showing that the DD method is a credible choice, with higher sensitivity and higher spatial resolution in gamma-ray log interpretation. The Point-Spread-Function of the Shengli Oil Logging Company's natural gamma ray spectroscopy instrument is obtained for the first time. The quantities of various radionuclides in their calibration pits are also obtained. The DD method was applied successfully to gamma-ray logging, offering a new option for SGR logging algorithm selection.

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LIU Zun-Nian, SUN Jian-Meng, WANG Jin-Liang and REN Ai-Ge. Implementation of the direct demodulation method for natural gamma ray spectral logging[J]. Chinese Physics C, 2014, 38(4): 046203. doi: 10.1088/1674-1137/38/4/046203

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Received: 2013-02-06
Revised: 2013-10-29

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沈阳化工大学材料科学与工程学院沈阳 110142

Implementation of the direct demodulation method for natural gamma ray spectral logging

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Implementation of the direct demodulation method for natural gamma ray spectral logging

Corresponding author: LIU Zun-Nian,

Corresponding author: SUN Jian-Meng,

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