Research of the near-surface investigation based on GRM
Zhong Ben-shan · Petroleum Geology & Oilfield Development in Daqing · 2007
In mountain,desert and Gobi areas,the hypsography is serious and static correction is an ill-posed problem.Under this condition,the research of the near-surface investigation is a available method.If we use the data of small refraction,we should correct the data of small refraction in addition.So a method based on GRM which uses the data of big gun is opposed.The approach is as follows:1、To predigest the time-depth equation of GRM,and request the time-depth value of every receiver to two shots;2、To stack the time-depth values of every receiver,and request the stacking time-depth value of every receiver;3、To request seismic velocities in refractors;4、To request the depths of refraction in every receiver.The method has been proved effective by model and field data.It can resolve the problem of static.