Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (3): 30502-030502.doi: 10.11889/j.0253-3219.2016.hjs.39.030502

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Effect of density measurement on D-D induced gamma counting

ZHANG Li1, YU Huawei2   

  1. 1 Department of Resources and Civil Engineering, Shandong University of Science and Technology, Tai'an 271019, China;
    2 College of Geo-Resources and Information, China University of Petroleum, Qingdao 266580, China
  • Received:2016-01-11 Revised:2016-02-15 Online:2016-03-10 Published:2016-03-11
  • Supported by:

    Supported by Talent Introduction and Scientific Research Initiating Fund of Shandong University of Science and Technology (No.2014RCJJ040), National Natural Science Foundation of China (No.41304095), Shandong Provincial Natural Science Fund (No.ZR2013DQ012), Qingdao City Science and Technology Program (No.14-2-4-65-jch), Teaching Reform Project of China University of Petroleum (No.SY-A201405)

Abstract:

Background: The controllable neutron source is used to replace the chemical gamma source to measure the formation density in oil exploration. Purpose: The effect of capture gamma counting on density is studied in the process of D-D source density measurement. Methods: Firstly, the principle of D-D source density measurement is analyzed, and the type of gamma-ray source in the process of D-D source and the formation is studied. In addition, the intensity of induced gamma between D-D and D-T source density measurement is compared using Monte Carlo simulation method. Results & Conclusion: The capture gamma takes a large proportion on D-D induced gamma density measurement. Although neutron yield of D-D source is far lower than that of D-T source, the capture gamma counting of D-D source is higher than inelastic gamma counting of D-T source with the distance from the source more than 50 cm in the low porosity formation. In addition, the capture gamma counting can be obtained by adjusting the source size to meet the requirements of density measurement in high porosity formation. Therefore, the counting of D-D induced gamma can meet the statistical accuracy of the density measurement.

Key words: D-D source, Capture gamma, Density measurement, Monte Carlo simulation

CLC Number: 

  • TL99