青藏高原困难地区开展区域重力调查工作遇到的问题与对策  

SOME PROBLEMS CONCERNING REGIONAL GRAVITY SURVEY IN DIFFICULT AREAS AND THEIR COUNTERMEASURES

作　　者：耿涛[1] 刘宽厚[1] 贺颢[2] 孟军海 杨明生 高鹏[1] 杜辉[1] 田中英[1] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]中国地质调查局,北京100037 [3]青海省第三地质矿产勘查院,青海西宁810001 [4]陕西省地质矿产勘查开发局第二综合物探大队,陕西西安710016

出　　处：《物探与化探》2012年第5期749-754,共6页Geophysical and Geochemical Exploration

基　　金：中国地质调查局青藏高原基础地质调查项目的多个1:20万区域重力调查项目及其配套项目(1212010710317;1212010818009;1212010818011;1212010818010等)

摘　　要：青藏高原的大部分地区自然条件恶劣、人口稀少、交通不便、基础测绘程度低、通讯条件极其落后,属于典型的开展区域重力调查工作的困难地区。在这些地区开展区域重力调查工作,在重力仪选择及标定、GPS控制点的建立及其控制范围、重力测点水准高程求取,以及近区地形改正、物性标本采集等方面都会遇到很多与内地一般地区工作时不一样的问题。笔者通过对青藏高原地区开展的多个1∶20万区域重力调查项目的野外工作过程进行总结,分析了困难地区区域重力调查项目实施过程中遇到的一些技术问题,认为可通过尽量选择高精度、稳定性好的重力仪,合理延长闭合时间,采用CQG2000似大地水准面模型求取测点水准高程,扩大GPS基准站的控制半径等办法解决。这些措施可作为以后在青藏高原地区及国内其他困难地区开展区域重力调查工作时的参考。It is difficult to carry out regional gravity survey in most parts of Tibetan Plateau due to the harsh natural and communication conditions as well as low level of basic mapping and bad communication. There exist many difficult problems in carrying out regional gravity survey work in this region, such as the selection and calibration of the gravimeter, the establishment of the control range and control points of GPS, the measurement of the level altitude of gravity measurement points, the revision of the near-zone terrain, and the collection of the physical properties of the specimen. Based on summarizing the experience gained from the 1 ： 200 000 regional gravity survey in Tibetan Plateau, the authors hold that many problems could be settled by the selection of high-precision and good sta- bility gravimeter, reasonable extension of the closing time, the adoption of CQG2000 quasi-geoid model to figure out the level elevation of a measuring point, and the expansion of the radius of the GPS base station. These measures can be used as references in the regional gravity survey work carried out in the Tibetan Plateau and other difficult areas.

关 键 词：青藏高原 区域重力调查 困难地区 

分 类 号：P631.1[天文地球—地质矿产勘探] P226.3[天文地球—地质学]