| With the development of worldwide petroleum industry,deviated holes,branch holes and horizontal wells are used to exploit oil reservoir which is smaller,thinner and worse. Logging while drilling(LWD)is used to evaluate and Geo-steering drill in this kind of reservoir because of its characters.Being an important method of electrical logging, electromagnetic wave logging is widely used in petroleum exploration.Researching on electromagnetic propagate conductivity logging while drilling of 2MHz response has an important signification to the explanation of log information and geological evaluation.In the paper,the response of electromagnetic propagate conductivity logging while drilling of 2MHz was researched using dyadic Green's function,including theoretical algorithm derivation,building physical model,logging response and explaining isotropic formation plate.And the achievements are obtained as following:(1)the dyadic Green's GME(r',r')and GMH(r,r')in layered anisotropic formation was developed.How to determine the Sommerfeld integral determined coefficient of equation group by recursive algorithm was deduced particularly.Then,this method program is compiled on the Fortran power station4.0 software.(2)The influencing regularity of electromagnetic logging response while drilling are simulated in layered isotropic and anisotropic formation considering thickness,rock and dip angle.(3)The impact factors of vertical resolution and detection of electromagnetic wave logging while drilling was analyzed.(4)Using dyadic Green's function,the relationship between phase difference conductivityσΦ,amplitude ratio conductivityσA and anisotropic are simulated in homogeneous medium formation and the conductivity in layered formation are also explained.The results provide a reference value to evaluate formation and Logging data interpretation.
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