摘要
在煤田三维地震勘探过程中,覆盖层厚度通过小折射、微测井及钻孔数据得到,但由于点位是分散的,得到只是该点位的覆盖层厚度值,即使采用折射静校正软件得到的覆盖层厚度图,也由于拉取的速度点位图有限,不能满足精度要求。针对这一问题,充分利用地震记录中的大量初至信息,采用拾取初至的方式,计算出直达波和折射波速度,求得全区覆盖层的厚度,并参照钻孔数据和小折射数据纠正该厚度,使覆盖层厚度测算更加精确。
In the process of 3D seismic exploration of coal field,the overburden thickness was obtained by small refraction,micrologging and borehole data,but because the points were scattered,only the overburden thickness value of that point was obtained,and even the overburden thickness map obtained by refraction static correction software cannot meet the accuracy requirement because of the limited velocity point map pulled.To address this problem,the large amount of first arrivals information in the seismic record was made,and the pick-up first arrivals were adopted to calculate the direct and refracted wave velocities to find the thickness of the overburden in the whole area,and this thickness with reference to the borehole data and small refraction data were corrected to make the overburden thickness measurement more accurate.
作者
咸海龙
刘万金
李君成
Xian Hailong;Liu Wanjin;Li Juncheng(Henan Institute of Geophysics and Space Information,Zhengzhou 450009,China;Henan Geological and Geophysical Engineering Research Center,Zhengzhou 450009,China;Henan University of Engineering,Zhengzhou 450009,China)
出处
《煤炭与化工》
CAS
2021年第4期44-45,49,共3页
Coal and Chemical Industry
关键词
折射波
小折射
折射初至
覆盖层厚度
refraction wave
small refraction
refraction first arrivals
overburden thickness
