The results of experiment in oil fields show that it can simulate the signals of downhole instruments and resolve the problem of self-test of ground system.
油田现场试验表明，它完全可以模拟井下仪器，解决了地面系统的自检问题。
2
Methods used have been gravity, ground and airborne magnetics, ground and airborne electromagnetics, IP/resistivity, downhole geophysical logging, and reflection seismic.
使用的物探方法有重力、地面和航空磁法、地面和航空电磁、IP／ 电阻率法、钻孔物探测井及地震反射。
3
The ground stress, formation pressure, desorption pressure and many inferred values, gained from these basic data of a certain coal bed in downhole may be obtained through testing and calculation.