Method for determining resistivity anisotropy from the response transitu00e0ria eletromagnu00c9tica step of the earth and the peak impulse response transitu00e0ria eletromagnu00c9tica

摘要

b method for determining resistivity anisotropy from the response transitu00e0ria eletromagnu00c9tica step of earth and response transitu00e0ria eletromagnu00c9tica the impulse to peak. d , the present invention relates to a method for determining resistivity anisotropy of rock formations of subsuperficie, which includes the transmission of a transient electromagnetic field in subsurface formations. The electromagnetic response of formations is measured in a plurality of deviations from a position of the transmission.For each displacement, a time of arrival from the transmission is determined from a peak of a response to the impulse, so that the answer is the horizontal and vertical subsuperficie resistivities.For each displacement, a response to the step of the formations is determined at a time from the transmission, selected so that the response to the step is related substantially only to the average resistivity. The time of arrival of the peak of the response to pulse and the value of time delayed response to step are used to determine the anisotropy of resistivity.