自然伽马能谱测井谱解析方法研究

doi:10.3863/j.issn.1674-5086.2010.05.012

西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (5): 75-78.DOI: 10.3863/j.issn.1674-5086.2010.05.012

自然伽马能谱测井谱解析方法研究

刘尊年1，任爱阁2，贾瑞皋3

1.青岛理工大学理学院，山东青岛 266033； 2.青岛滨海学院基础部，山东青岛 266555；3.中国石油大学物理科学与技术学院，山东东营 257062

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-10-20 发布日期:2010-10-20

STUDY ON SPECTRAL ANALYSIS OF NATURAL GAMMA RAY SPECTRA LOG

LIU Zun-nian1,REN Ai-ge2，JIA Rui-gao3

1.School of Science,Qingdao Technological University,Qingdao Shandong 266033,China；2.Department of Basic Courses，Qingdao Bin Hai University,Qingdao Shandong 266555，China；3.College of Physics Science and Technology，China University of Petroleum，Dongying Shandong 257062，China

Received:1900-01-01 Revised:1900-01-01 Online:2010-10-20 Published:2010-10-20

摘要/Abstract

摘要：

自然伽马能谱测井是重要的核测井方法之一，其地面信息处理系统的关键是实测谱解析技术。低分辨率是自然伽马能谱测井仪的固有弱点，且测井过程中信噪比较低，造成测井置信度不高。从自然伽马能谱测井原理出发，通过中海油实验数据处理后获得的放射性核素的标准计数率谱，对自然伽马能谱测井4种传统数据处理方法的优劣进行了对比，初步探讨了将灵敏度高、空间分辨率好的直接解调方法移植到自然伽马能谱测井谱解析中，为自然伽马能谱测井谱解析方法的选择提供了依据。

关键词: 自然伽马能谱测井, 谱解析, 直接解调方法, 响应函数, 物理约束

Abstract:

JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SCIENCE & TECHNOLOGY EDITION)，VOL.32，NO.5,75-78,2010（ISSN 1674-5086，in Chinese）
Abstract： Natural Gamma Ray Spectra log(SGR) is an important nuclear logging method,and real spectral analysis is a key technique of the surface processing system in SGR．Due to the inherent low resolution of Natural Gamma Ray Spectra log,there is a low signal-to-noise ratio and low confidence level during the logging process．Based on the principle of Natural Gamma Ray Spectra log,the normal count rate spectra are obtained from the test pit,and the four traditional algorithm methods are tested.Besides,the authors perform preliminary research on applying the direct demodulation method which has a high sensitivity and spatial resolution in gamma-ray log.This research offers a credible basis for algorithm selecting．

Key words: Natural Gamma Ray spectrometry log, spectrum unscrambling, direct demodulation method, response function, physical constrains

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