Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (1): 10501-010501.doi: 10.11889/j.0253-3219.2019.hjs.42.010501

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Study on the influence of formation factors on spatial distribution of D-D induced γ-ray source

Li ZHANG1,3,Huawei YU2,Wenbao JIA3,Yinhui WANG1   

  1. 1. Department of Resources and Civil Engineering, Shandong University of Science and Technology, Taian 271019, China
    2. School of Geosciences, China University of Petroleum, Qingdao 266580, China
    3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
  • Received:2018-10-17 Revised:2018-11-07 Online:2019-01-10 Published:2019-01-25
  • Supported by:
    Supported by National Natural Science Foundation of China (No.41704113, No.41674129), Science and Technology Plan Project of Shandong Education of China (No.J18KA190), Science and Technology Plan Project of Tai’an (No.2017GX0013), and Talent Introduction Scientific Research Initiating Fund of Shandong University of Science and Technology (No.2014RCJJ040)

Abstract: Background

The spatial distribution of D-D “induced γ-ray source” is significantly different from that of entity γ-ray source, and it is more susceptible to the influence of various formation factors.

Purpose

This study aims at the spatial distribution of D-D induced γ-ray sources under different conditions in density logging.

Methods

Firstly, based on the principle of D-D controllable source density measurement, calculation model of density logging using D-D source was built. Then the spatial distribution characteristics of γ-ray sources under different formation conditions such as various hydrogen index, lithology and salinity, were simulated by using MCNP. Finally, all these influencing factors and simulation results were analyzed and summarized.

Results

Among these factors, the hydrogen index has the greatest impact on the spatial position of induced γ-ray source, and particularly, when formation hydrogen index varies within the range of 0~0.1, the spatial positions of capture γ-rays will change significantly. Comparatively, formation lithology and salinity have greater impact on the intensity of induced γ-rays than on the spatial distribution of these γ-rays. For formations of different lithologies, the types and contents of main elements in the formations are different.

Conclusions

The spatial distribution of induced γ-ray source spatial position and intensity are susceptible to the influence of various formation factors. This research provides the basic data for correcting the effects on D-D induced γ-ray source.

Key words: D-D Source, Density measurement, Induced γ-ray source, Spatial distribution

CLC Number: 

  • TL99,P631.8+17