We have introduced the field configuration of Bore-ground Electromagnetic Method(BGEM) for oil reservoir injected steam dynamic monitoring and the technique for data processing and inversion.

Study of hydrocarbon accumulation by borehole-ground EM method.;

We then introduce the method of measuring principle and also discuss the surface-borehole electrical method of observing systems.

3-D physical model experiments of well-to-ground electrical survey.;

borehole electromagnetics , and borehole gravity.

The radio-wave penetration method can detect the relative locations of abnormal structures such as collapse columns,faults and thin coal layer areas,and the mine transient electromagnetic method can estimate the water-containing situation of these structures based on the variation of the resistivity in the detection range.

Then,it summarizes the present situation of geophysical methods,and presents an introduction to some methods such as mine direct current method,mine transient electromagnetic method and geological radar exploration.

This paper discusses the utilization of the mine transient electromagnetic method to detect the location of hydrological borehole that lies in the coal layer or in front of the laneway,and gives a qualitative appraisal of its hydrous characteristics.