重力勘查的近况与展望

本文在前一部分扼要回顾了地矿部门近年来的重力勘查工作,指出在七个方面取得的进展。特别是七十年代末系统开展的区域重力调查工作方面:建立了统一的重力基点网;发展了测高技术;研制了带恒温的大测程重力仪;研究了多功能重力数据库;制定了一套适应区域重力调查需要的野外及资料整理技术规定。因而使在全国规模上开展的1:20万、1:100万区域重力调查起步良好,成果可喜。同时,在重力普详查找矿和其他领域工作中也获得较好的成果。本文后一部分对今后重力勘查工作做了展望。提出要进一步扩大应用范围,要在重力勘查技术上有所发展,要在已基本解决野外工作方法的基础上大力开展重力编图和资料的解释及应用。并对一些重要概念做了具体分析。如在布格重力异常的认识、“群体”问题、分解区域场和局部异常及人机对话反演选择法上做了初步探讨,以供物探工作者参考。

RECENT DEVELOPMENTS AND PROSPECTS OF GRAVITY PROSPECTING

The present paper consists of two parts. The first part gives a beief review on the gravity prospecting work carried out in recent years by Ministry of Geology and Mineral Resouces, indicating the advances achieved in seven aspects. The regional gravity survey conducted since the end of 1970's has attained especially remarkab'e achievements, such as the establishment of the unified base points net, the development of the height measurement technique, the design of gravimeter with constant-temperature device for long-distance measurement, the investigation into multifunctional data bank, and the formulation of technical stipulations for field work and data arrangement suitable for regional gravity prospecting. All this shows a good and encouraging beginning in the nationwide regional gravity survey conducted at the scale of 1:200,000 and 1: 1, 000,000. In addition, fairly good results have also been obtained in gravity reconnaissance and detailed exploration in search for ore and in some other fields.The second part of this paper is devoted to the prospects for the gravity prospecting work in future. It is proposed that the application scope of this method should be expanded, that the gravity prospecting technique should be further developed, and that the gravity map-compilation as well as data interpretation and application should be extensively carried out following the fundamental solution of the problem of field work technique. Atentative discussionhas also been made on some important concepts such as the Bouguer gravity anomalies, the problem of "groups", the resolution of regional anomalies and local anomalies,and the inverse selection technique of man-machine dialogue, which might be of some value to researchers of geophysical prospecting.