Research on spacing optimization and density inversion for ultra-slim X-ray density logging tool

Fan Jilin; Jin Ya; Li Min; Zhang Qiong; Yang Ziyu; Wang Rongpu; Hui Dangtao

doi:10.7623/syxb202503006

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Research on spacing optimization and density inversion for ultra-slim X-ray density logging tool

更新时间：2025-12-03

- Research on spacing optimization and density inversion for ultra-slim X-ray density logging tool
- ACTA PETROLEI SINICA Vol. 46, Issue 3, Pages: 563-573(2025)
- 作者机构：
  
  1. 电子科技大学自动化工程学院,四川,成都,611731
  2. 中国石油集团测井有限公司,陕西,西安,710077
  3. 中海油田服务股份有限公司,河北,三河,065201
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202503006
  CLC： P631.8
- Published Online：03 April 2025，
  
  Published：2025
- 稿件说明：
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范继林, 金亚, 李敏, 张琼, 杨籽钰, 王荣谱, 惠党涛. 超细径X射线密度测井仪的源距优化与密度反演[J]. 石油学报, 2025, 46(3): 563-573.

Fan Jilin, Jin Ya, Li Min, et al. Research on spacing optimization and density inversion for ultra-slim X-ray density logging tool[J]. ACTA PETROLEI SINICA, 2025, 46(3): 563-573.
范继林, 金亚, 李敏, 张琼, 杨籽钰, 王荣谱, 惠党涛. 超细径X射线密度测井仪的源距优化与密度反演[J]. 石油学报, 2025, 46(3): 563-573. DOI： 10.7623/syxb202503006.

Fan Jilin, Jin Ya, Li Min, et al. Research on spacing optimization and density inversion for ultra-slim X-ray density logging tool[J]. ACTA PETROLEI SINICA, 2025, 46(3): 563-573. DOI： 10.7623/syxb202503006.

摘要

随着油气勘探的不断深入

新一代可控源X射线密度测井仪器的优化设计和测量方法研究备受关注。以现有的超细径伽马射线密度测井仪为例

将伽马射线源替换为X射线源并进行仪器的重新设计

研究的重点内容包括:①模拟不同能量X射线的产生机理;②综合考虑探测效率、密度测量灵敏度、探测深度等因素

研究X射线密度测井仪的最佳源距;③采用多变量正反演方法进行X射线密度测量

并与伽马射线密度测井仪的结果进行对比。研究结果表明

通过将近探测器和远探测器的源距分别调整为110 mm和290 mm

X射线密度测井仪的性能可以与伽马射线密度测井仪相当甚至超过伽马射线密度测井仪。与伽马射线密度测井仪相比

X射线密度测井仪具有更高的地层灵敏度、垂直分辨率和地层密度测量准确度。此外

在重泥饼条件下

X射线密度测井仪将光电截面吸收指数的测量准确度提升了0.15 b/e。研究成果为X射线密度测井仪的前瞻性设计和地层密度的准确测量提供了一定的技术支持。

Abstract

As oil and gas exploration continuously progresses

much attention is paid on the research of the optimization design and measurement methods of the next-generation controllable source X-ray density logging tools. Taking the existing ultra-slim gamma-ray density logging tool for an example

it is re-designed by replacing gamma-ray source with X-ray source. The research mainly focuses on the following points:(1) to simulate the generation mechanism of X-ray with different energies; (2) to study the optimal spacing of X-ray density logging tool when comprehensively considering the account detection efficiency

density measurement sensitivity

detection depth and other factors; (3) to carry out X-ray density measurements using multi-variable forward and inversion methods

and further compare with gamma density logging results. The results indicate that the performance of X-ray density logging tool can equal to or even exceed that of gamma-ray density logging tool by adjusting the source-detector spacings of near and far detectors to 110 mm and 290 mm

respectively. Compared with gamma-ray density logging

X-ray density logging is characterized by higher formation sensitivity

vertical resolution and formation density measurement accuracy. In addition

X-ray density logging tool can improve measurement accuracy of photoelectric absorption cross-section index by 0.15 b/e in condition of heavy mud cake. In conclusion

these findings provide certain technical support for the prospective design of X-ray density logging tool and the accuracy measurement of formation density.

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