Electromagnetic measurements using a group of two or more electromagnetic receivers

摘要

To survey a subterranean structure, for acquiring an electromagnetic (EM) measurement signal across EM receivers having a target axial spacing, a group of more than two EM receivers in an interval defined by the target axial spacing along a sensor cable is provided. The spacing between successive ones of at least some EM receivers in the group is less than the target axial spacing. EM measurements are acquired using the EM receivers in the group.

主权项

1. A method of surveying a subterranean structure, comprising:
for acquiring an electromagnetic (EM) measurement signal across EM receivers having a target axial spacing, providing a group of more than two EM receivers in an interval defined by the target axial spacing along a sensor cable, wherein spacing between successive EM receivers in the group is less than the target axial spacing; and acquiring EM measurements using the EM receivers in the group; and communicating the acquired EM measurements to a computer that processes the acquired EM measurements to generate the EM measurement signal defined across the target axial spacing, and wherein providing more than two EM receivers in the interval defined by the target axial spacing causes extra sampling of EM measurements defined across the generation of the EM measurement signal defined across the target axial spacing, the extra sampling of EM measurements used for filtering of noise from the EM measurement signal.