测井技术2024，Vol.48Issue(3)：301-307,7.DOI:10.16489/j.issn.1004-1338.2024.03.003
基于正则化约束的方位伽马成像测井分辨率提高方法
Resolution Improvement Method of Azimuth Gamma Imaging Logging Based on Regularization Constraint
摘要
Abstract
The azimuth gamma logging while drilling can be used for formation radioactive intensity analysis, geo-steering and reservoir interface identification, but it is greatly affected by statistical errors, resulting in low resolution of curves and imaging. Especially in the formations with low contrast, this effect is more pronounced. In order to improve the imaging resolution of the azimuth gamma logging while drilling, a regularization method for potential gamma data is proposed based on instrument response characteristics to obtain more accurate formation radioactivity intensity. Firstly, according to the detector response principle, the response sensitivity function of azimuth gamma logging is obtained by numerical simulation and experiment, and the accuracy of the sensitivity factor is verified. Then, the original azimuth gamma data is processed by constructing regularization formula and adjusting calculation parameters. The result shows that the focusing performance and contrast of azimuth gamma curve obtained by this method are improved, which avoids the overfitting problem caused by the linear solution method in the past.Moreover, the resolution of gamma imaging is significantly enhanced, and the recognition ability of thin layer is also improved. As a result, this method can provide more accurate and clear imaging results, thereby improving the geo-steering ability of the instrument and reservoir drilling rate.关键词
随钻方位伽马测井/成像分辨率/正则化/放射性强度/蒙特卡罗模拟Key words
azimuthal gamma logging while drilling/imaging resolution/regularization/radioactivity intensity/Monte Carlo simulation分类
天文与地球科学引用本文复制引用
于华伟,赵帅,岳喜洲,李国玉,邵才瑞,肖红兵,陈瑾泓..基于正则化约束的方位伽马成像测井分辨率提高方法[J].测井技术,2024,48(3):301-307,7.基金项目
山东省自然科学基金"可控X射线源高分辨率岩性密度测井方法研究"(ZR2022MD019) （ZR2022MD019）
中海油田服务股份有限公司技术开发项目"随钻探边方位成像快速正演方法及软件开发"(G2217A-0414T282) （G2217A-0414T282）
中央高校基本科研业务费专项资金"随钻井筒信息一体化地质导向关键技术研究与基础软件开发"(22CX01001A-2) （22CX01001A-2）
