Neighboring resistivity anisotropy determination
A method and system for identifying anisotropy properties in a formation. The method may include disposing a logging tool into a formation, wherein the logging tool may include an electromagnetic transmitter antenna and an electromagnetic receiver antenna. The method may further include transmitting an electric field signal into the formation from the electromagnetic transmitter antenna, receiving a reflected electric field signal or a magnetic field signal from the formation with the electromagnetic receiver antenna, measuring the reflected electric field signal or the magnetic field signal from the formation with the electromagnetic receiver antenna, and identifying one or more anisotropy properties of adjacent layers in the formation from the reflected electric field signal or the magnetic field signal.
1 . A method comprising:
disposing a logging tool into a formation, wherein the logging tool comprises:
an electromagnetic transmitter antenna; and
an electromagnetic receiver antenna, wherein at least one of the electromagnetic transmitter antenna or the electromagnetic receiver antenna comprises an electric field antenna;
broadcasting an electric field signal into the formation from the electromagnetic transmitter antenna;
receiving a reflected electric field signal or a magnetic field signal from the formation with the electromagnetic receiver antenna;
measuring the reflected electric field signal or the magnetic field signal from the formation with the electromagnetic receiver antenna; and
identifying one or more anisotropy properties of adjacent layers in the formation from the reflected electric field signal or the magnetic field signal, wherein the electric field antenna allows detection of the one or more anisotropy properties based on the reflected electric field signal, the magnetic field signal, or both.
2 . The method of claim 1 , wherein the electromagnetic transmitter antenna is a toroidal coil.
3 . The method of claim 1 , wherein the electromagnetic receiver antenna is a toroidal coil or a solenoid coil.
4 . The method of claim 1 , wherein the formation is an anisotropy formation.
5 . The method of claim 4 , wherein the anisotropy formation is divided into an upper layer and a lower layer.
6 . The method of claim 5 , wherein the upper layer has a resistivity of is 20 Ω·m or 100 Ω·m.
7 . The method of claim 5 , wherein the lower layer has a resistivity offs 1 Ω·m.
8 . The method of claim 5 , wherein the lower layer where Rh is equal to 1 Ω·m and Rv is equal to 5 Ω·m.
9 . A method comprising:
disposing a logging tool into a formation, wherein the logging tool comprises:
an electromagnetic transmitter antenna; and
an electromagnetic receiver antenna, wherein at least one of the electromagnetic transmitter antenna or the electromagnetic receiver antenna comprises an electric field antenna;
transmitting a magnetic field signal into the formation from the electromagnetic transmitter antenna;
receiving a reflected electric field signal or a magnetic field signal from the formation with the electromagnetic receiver antenna;
measuring the reflected electric field signal or the magnetic field signal from the formation with the electromagnetic receiver antenna; and
identifying one or more anisotropy properties of adjacent layers in the formation from the reflected electric field signal or the magnetic field signal, wherein the electric field antenna allows detection of the one or more anisotropy properties based on the reflected electric field signal, the magnetic field signal, or both.
10 . The method of claim 9 , wherein the electromagnetic transmitter antenna is a toroidal coil.
11 . The method of claim 10 , wherein the electromagnetic receiver antenna is a toroidal coil or a solenoid coil.
12 . The method of claim 10 , wherein the formation is an anisotropy formation.
13 . The method of claim 12 , wherein the anisotropy formation is divided into an upper layer and a lower layer.
14 . The method of claim 13 , wherein the upper layer has a resistivity of 20 Ω·m or 100 Ω·m.
15 . The method of claim 14 , wherein the lower layer has a resistivity of 1 Ω·m.
16 . The method of claim 14 , wherein the lower layer has a horizontal resistivity Rh equal to 1 Ω·m and a vertical resistivity Rv equal to 5 Ω·m.
17 . A method comprising:
disposing a logging tool into a formation, wherein the logging tool comprises an electromagnetic antenna, wherein the electromagnetic antenna comprises an electric field antenna;
broadcasting an electric field signal into the formation from the electromagnetic antenna;
receiving a reflected electric field signal from the formation with the electromagnetic antenna;
measuring the reflected electric field signal from the formation with the electromagnetic antenna; and
identifying one or more boundaries in the formation from the reflected electric field signal, wherein the electric field antenna allows detection of one or more anisotropy properties associated with the formation based on the reflected electric field signal.
18 . The method of claim 17 , wherein the formation is an anisotropy formation.
19 . The method of claim 18 , wherein the one or more boundaries in the anisotropy formation is divided into an upper layer and a lower layer.
20 . The method of claim 19 , wherein the upper layer has a first resistivity of 20 Ω·m or 100 Ω·m, and the lower layer is an isotropic layer with a second resistivity of 1 Ω·m or an anisotropic layer where a horizontal resistivity Rh is equal to 1 Ω·m and a vertical resistivity Rv is equal to 5 Ω·m.