ferramenta para formar imagem atraves de um meio substancialmente nao condutivo, e metodo para medir uma componente de uma impedencia de uma formacao atraves de um meio substancialmente nao condutivo

摘要

The invention is concerned with a tool and method for imaging a formation through a substantially non-conductive medium. The tool comprises first circuitry (96) for injecting a current into the formation, wherein a complex impedance to the current is measured. Second circuitry for determining a phase angle of an impedance (90,92) of the non-conductive medium and third circuitry for determining a component of the complex impedance that is orthogonal to the phase angle.