超细径X射线密度测井仪的源距优化与密度反演

doi:10.7623/syxb202503006

石油学报 ›› 2025, Vol. 46 ›› Issue (3): 563-573.DOI: 10.7623/syxb202503006

• 地质勘探 • 上一篇

超细径X射线密度测井仪的源距优化与密度反演

范继林^1,2, 金亚³, 李敏³, 张琼¹, 杨籽钰¹, 王荣谱², 惠党涛²

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

收稿日期:2024-07-11 修回日期:2024-10-08 发布日期:2025-04-03
作者简介:范继林,男,1996年5月生,2023年获中国石油大学(华东)博士学位,现为电子科技大学和中国石油集团测井有限公司联合培养博士后,主要从事核测井理论方法与技术研究。Email:fanjl1996@163.com
基金资助:
国家自然科学基金项目(No.U23B20151)和四川省自然科学基金青年科学基金项目(2025ZNSFSC1168)资助。

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

Fan Jilin^1,2, Jin Ya³, Li Min³, Zhang Qiong¹, Yang Ziyu¹, Wang Rongpu², Hui Dangtao²

1. School of Automation Engineering, University of Electronic Science and Technology of China, Sichuan Chengdu 611731, China;
2. China National Logging Corporation, Shaanxi Xi'an 710077, China;
3. China Oilfield Services Limited, Hebei Sanhe 065201, China

Received:2024-07-11 Revised:2024-10-08 Published:2025-04-03

摘要/Abstract

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。

关键词: X射线密度测井, 仪器优化设计, 地层密度计算, 蒙特卡罗方法, 伽马射线密度测井

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.

Key words: X-ray density logging, tool optimization design, formation density calculation, Monte Carlo method, gamma-ray density logging

中图分类号:

P631.8

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, Zhang Qiong, Yang Ziyu, Wang Rongpu, Hui Dangtao. Research on spacing optimization and density inversion for ultra-slim X-ray density logging tool[J]. Acta Petrolei Sinica, 2025, 46(3): 563-573.

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超细径X射线密度测井仪的源距优化与密度反演

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

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