山区二维地震勘探多次覆盖灵活观测方法

TECHNIQUES FOR FLEXIABLY CHANGING THE 2-D MULTIFOLD SEISMIC LAYOUTS IN MOUNTAINOUS AREAS

针对山区地表地形复杂,难于钻炮井和正常埋没检波器的情况,在地震勘探技术规范要求允许范围内,可采用灵活加井、适当扩大偏移距、变方向观测等方法,设计并实施各种灵活观测系统,达到在某一地段内不设炮点只设检波点,或只设炮点不设检波点,或炮点、检波点皆不设置,也能准确获取其地下地震信息之目的。

Owing to the tough relief of the mountainous areas,the drilling of shotholes and the laying out of geophones are very defficult to carry out,hence,it is a hard job to get correct information from underground. Is there any means to solve this problem and make the data acquired more accurate ?the answer is in the affirmative. In order to attain the end we have in view,the way of taking a flexible layout could be adopted. That is to say,in a certain section,more shotholes might be inserted in,the offset might be appropriately extended or shortened and the azimuth of the seismic line could also be altered. As a result,there may be not any shot point but geophones in a certain sector of an area,or it might be just in the contrary, and there might be even more neither shotpoints nor geophone in some sectors. Though that is the case and no math- er how changeable the layout might be,there is a principle which should strictly be followed,that is ,the alternation should not exceed the allowance limited by the specification.