融合DBSCAN多测点算法的磁方位校正  

Magnetic azimuth correction based on DBSCAN multi-station analysis algorithm

作　　者：许泽凡 宋红伟[1] 张明菊 胡少兵[1] 陈雪菲 程为彬 Xu Zefan;Song Hongwei;Zhang Mingju;Hu Shaobing;Chen Xuefei;Cheng Weibin(Key Laboratory of Exploration Technologies for Oil and Gas Resources,MOE,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100

出　　处：《网络安全与数据治理》2023年第2期83-88,共6页CYBER SECURITY AND DATA GOVERNANCE

基　　金：湖北省重点研发计划项目(2020BAB094)。

摘　　要：单测点校正法计算复杂、不稳定、误差较大,无法满足井下地磁方位角的精度要求。基于间接单测点分析法和Brooks多测点分析法,提出一种新方法,通过DBSCAN(Density-Based Spatial Clustering of Applications with Noise)算法识别并剔除噪声,采用椭圆校正法校正径向干扰,轴向干扰则由单轴多测点分析法校正。实验证明:改进多测点法不仅可以进一步提高椭圆校正的拟合效果,还能降低噪声对参考点计算值的影响,计算得到的方差曲线收敛性更强、更稳定,校正后方位角误差进一步降低。The single-point correction method is complex and unstable with large of errors,which cannot meet the preci-sion requirements of the downhole azimuth.Based on the indirect single measurement point analysis method and the mul-ti-station analysis of Brooks,a new method is proposed to identify and eliminate noise by the Density-Based Spatial Clustering of Applications with Noise(DBSCAN),and the ellipse correction method is used to correct the radial interference,the axial interference is corrected by the uniaxial multi-station analysis algorithm.Experiments show that improving the multi-station analysis not only further improves the fitting effect of ellipse correction,but also reduces the influence of noise on the calculated value of reference points,making the calculated variance curve more convergent and more stable,and the corrected azimuth error is further reduced.

关 键 词：磁方位校正 多测点分析法 DBSCAN 椭圆校正 

分 类 号：TE29[石油与天然气工程—油气井工程]