Apparatus for determining a property of a formation surrounding a borehole drilling, method for determining a property of a formation surrounding a borehole drilling, equipment used for Electric Research of geological formations (GF) surrounding a borehole probe. Gem (BH), and method of electrical research geological formations (GF) which surrounds a drill hole (BH)

摘要

Apparatus for determining a property of a formation surrounding a borehole drilling, method for determining a property of a formation surrounding a borehole drilling, equipment used for Electric Research of geological formations (GF) that surround a f 'uro probe Gem (BH).Method and electrical investigau00e7u00e0o geological formations (GF) which surrounds a drill hole (BH) equipment used in electrical research geological formations Ge surrounding a drill hole BH, comprising: - a body electrically conductive 102 shifts along the Extension of the boring hole.At least a first transmitter you to induce a first current from a first position of transmission and moving in a path that includes a first portion of the body and a selected zone SZ of geological formations GF.At least a second transmitter T2 for inducing a second current from a second position and moving in a path which includes a second portion of the body and the selected zone SZ, the position of the second transmitter T2 being different from the position of the first transmitter you in the body. At least one first Mo, ML and third M2 current sensors for measuring an axial first.A second and a third axial current that flows throughout the body, respectively, the position of the first, second, and third axial current sensor in the body being different from one another, and at least one current sensor to the body side R2 to measure a first electrical signal From the first chain and a second electrical signal from the second current.The equipment further comprises: a sensor virtual axial current that provides a virtual measurement of axial interpolate or extrapolate current through two current measurements made in different axial positions which are not adjacent to the current sensor side.And an electronic module 103 for deriving an indication of the resistivity or conductivity of the selected zone SZ, based on the measured first electrical signal, the second electrical signal currents and the current virtual axial thrust is calculated.