Patent ID: 8826982
Filing Date: 2014-09-09
Classification: G01S,G01V

Abstract:
1. A method for detecting a geometry of underground fractures, comprising: a) introducing a filling material into an underground fracture to form a pack of filling material; b) transmitting an electromagnetic field into said fracture; c) detecting at least one reflected signal of said transmitted electromagnetic field; and d) processing said at least one detected signal to reconstruct geometric and dimensional characteristics of said pack of filling material, wherein said electromagnetic field transmitted into said fracture has a frequency in a range of from 30 megahertz to 250 megahertz and wherein said electromagnetic field is emitted with a parallel polarization with respect to the linear extension of the end part of said fracture, said end part of said fracture behaving like a corner reflector, said filling material comprising a proppant and a fracturing liquid or a hydrocarbon, but without any further additive for improving transmission or reflection of an electromagnetic wave.