Detection sensitivity and new concept of deep reading look-ahead look-around geosteering tool

Hagiwara, Teruhiko (Aramco Services Company)


A conceptually new geosteering tool is discussed. The tool uses conventional coil transmitters but measures the electric field unlike any conventional resistivity tool that measures the magnetic field. The detection sensitivity is defined for each type of electromagnetic field measurement. Examination of both electric and magnetic field responses to a distant conductivity anomaly from magnetic dipole transmitters showed that the electric field responses are significantly more sensitive to the anomaly. With a transverse magnetic dipole transmitter, the orthogonal and transverse electric field measurement is sensitive to detect a conductivity anomaly far ahead of the tool. While the coplanar magnetic field measurements in conventional geosteering tools are known to be sensitive to the conductivity anomaly around the tool, the axial electric field measurement using the transverse magnetic dipole transmitter and the transverse electric field measurement using magnetic dipole transmitter are much more sensitive to the anomaly around the tool than any magnetic field measurements. This deep looking capability is achieved with relatively short source-receiver spacing.

Presentation Date: Tuesday, October 16, 2018

Start Time: 8:30:00 AM

Location: 212A (Anaheim Convention Center)

Presentation Type: Oral