Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (12): 120401-120401.doi: 10.11889/j.0253-3219.2018.hjs.41.120401


Study on near detector-source spacing of density logging based on X-ray source

ZHOU Yue1,2, YU Huawei1,2, CHEN Xianghong1,2, LUO Xu3, ZHANG Li4   

  1. 1 China University of Petroleum(Huadong), Qingdao 266580, China;
    2 Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
    3 China Petroleum Logging Co. Ltd. Liaohe Branch, Panjin 124011, China;
    4 Shandong University of Science and Technology, Tai'an 271019, China
  • Received:2018-09-07 Revised:2018-10-22 Online:2018-12-10 Published:2018-12-13
  • Supported by:
    Supported by National Natural Science Foundation of China (No.41674129, No.41704113), the National Key Research and Development Program of China (No.2016YFC0302800), Fundamental Research Funds for the Central Universities (No.14CX02182A, No.16CX02039A), Teaching Reform Project for China University of Petroleum (No.SY-A201405), National Science and Technology Major Project (No.2017ZX05009001), Shandong Province Science and Research Project (No.J18KA190)

Abstract: [Background] It has become a new trend to use X-ray source instead of 137Cs source in density logging for development of oil logging.[Purpose] This study aims to analyze the near detector-source spacing's change when using a lower energy X-ray source instead of 137Cs source in density logging.[Methods] Monte Carlo simulation method is used to study the critical detector-source spacing of different energy X-ray sources during the formation of water saturated limestone with different porosity, in addition, the near detector-source spacing is analyzed according to those sensitivities of X-ray sources and 137Cs source.[Results] Simulation results show that low energy X-ray source's critical detector-source spacing is shorter compared with 137Cs source's density instrument. When the density sensitivity is the same, the near detector-source spacing of X-ray source is shorter than that of 137Cs source.[Conclusion] This study provides a theoretical basis for the design of near detector-source spacing of instrument.

Key words: X-ray source, Density logging, Monte Carlo method, Critical detector-source spacing, Density sensitivity, Near detector-source spacing

CLC Number: 

  • P631.81