摘要
重力测量是大地测绘及地球物理勘探的重要部分,根据不同的重力规范开展双程往返观测(i、j、j′、i′),其对零漂率的计算也不同,地质调查规范将j点的重复测量做静掉格处理,石油规范运用回归分析的方法计算零漂率。j点的重复测量间隔的处理不同,导致两类规范得出的零漂率数值差异明显。本文通过对理论算式分析和实测数据对比,分析了j点重复测量的g′j-gj、t′j-tj对零漂率计算的影响,对比石油规范中采用的回归分析法,说明了“静掉格”处理对减小因仪器性能、测量环境影响导致的不确定因素的重要意义,提出了两类规范的适用条件。
Gravity survey is an important part of geodetic mapping and geophysical exploration.Different gravity specifications adopt different methods to calculate the zero drift rates in two-way reciprocal observations(i,j,j′,i′).The repeated measurements of point j are subjected to static drift in the geological survey specification.By contrast,the zero drift rate is calculated through regression analy-sis in the petroleum specification.Different processing methods for the repeated measurement interval of point j yield significantly differ-ent zero drift rates based on the two specifications.Through theoretical formula analysis and comparison of measured data,this study analyzed the influence of g′j-gj and t′j-tj in the repeated measurements of point j on the calculation of the zero drift rate.By comparing with the regression analysis,this study illustrated the importance of static drift in reducing the uncertainties caused by instrument per-formance and measurement environment.Moreover,this study proposed the applicable conditions of the two specifications.
作者
常小鹏
陈亮
张翔
张凌霄
朱樟柳
乔衍溢
CHANG Xiao-Peng;CHEN Liang;ZHANG Xiang;ZHANG Ling-Xiao;ZHU Zhang-Liu;QIAO Yan-Yi(Geophysical Survey Center,China Geological Survey,Langfang06500,China;School of Geophysics and Information Technology,China Universi-ty of Geosciences(Beijing),Beijing100083,China;Civil-Military Integrated Geological Survey Center,China Geological Survey,Chengdu610000,China;Langfang Center for General Survey of Natural Resources,China Geological Survey,Langfang065000,China)
出处
《物探与化探》
CAS
北大核心
2023年第5期1307-1315,共9页
Geophysical and Geochemical Exploration
基金
中国地质调查局项目“雅鲁藏布江大游SDZ开发规划建设区综合地球物理调查”(DD20211546)。
关键词
规范
重力测量
双程往返
零漂率
静掉格
specification
gravity measurement
two-way reciprocal observation
zero drift rate
static drift
