Transient electromagnetical method for reservoir pore space anisotropy

The invention pertains to the field of geophysical exploration and oilfield development technology, is a transient electromagnetic method for determining the reservoir pore anisotropy and comprises the following steps: an earthing conductor is taken as a driving source which deviates from a measuring line x direction to form a deflection angle Phi0, and two electric field components Ex and Ey orthometric each other are measured and recorded; the formation resistivity of x direction and y direction at different depth are obtained by refutation; an amplitude value of the horizontal component ofelectric field total field vector, an electric field anisotropy coefficient and an azimuth of an electric field principal axis vector are counted; the formation porosity value on the direction of electric property principal axis is obtained by the resistivity value on the direction of electric property principal axis; a vector arrow diagram is drawn, the length of the arrow shows the magnitude ofthe formation porosity or