Wells Magnetic Survey Forward The Research And The Chinese Continental Scientific Drilling Project Borehole Magnetic Survey Data Processing And Interpretation

The borehole magnetic survey can provide the information about distributing andmagnetic field variety of magnetic geologic body, which is in or around the borehole.It is a useful geophysical method in borehole for the prospecting of magnetite ormagnetic mineral.Forward problem and inversion problem both are including in every branch ofgeophysics, the former is the foundation of the latter. To know well magnetic fielddistributing of different magnetic bodies and the relation between magnetic field andeach parameter, we can explain magnetic anomaly. In this paper, we figure outmathematics formulae of a few simple magnetic bodies from the basic formulae andcompute magnetic field of sphere and board bodies, analyze magnetic character.The magnetic directional system of logging tools used in the boreholetricomponent magnetic survey in CCSD main hole, is different from the directionalsystems that have been used. In this paper, we analyze the differences betweendifferent magnetic directional systems, and carry out the conversion of tool logginginformation to tricomponent magnetic information in the geodetic coordinates system.And then calculate and interpret the magnetic anomaly.