Abstract：In worldwide,thin and interbedded reservoir occupied 30% of total discovered reservoirs. The thin and interbedded reservoir is also called anisotropic reservoir that occupies more proportion in China. Ordinary electromagnetic logger only measures resistivity in horizontal direction and easily underestimates and fails to measure the interactive thin reservoir with low resistivity and low contrast. The 3-C induction log system can directly measure both horizontal and vertical resistivity of strata and also measure the dip angle and azimuth of strata. The paper introduced structure and measuring principle of coil system in 3-C induction logger, expounded two forward and inversion methods of anisotropic strata: staggering grid finite-difference method and finite-element method and finally further discussed application prospect of 3-C induction log system
