DeepLook-EM Crosswell Electromagnetic Imaging Service | Schlumberger

DeepLook-EM

Crosswell electromagnetic imaging service

Imaging the interwell space

Crosswell electromagnetic (EM) imaging expands the scale investigated by resistivity logging to deliver the big picture—between wells up to 3,280 ft [1,000 m] apart. By monitoring fluid distribution and movement on a reservoir scale, DeepLook-EM service gives you information critical to optimizing sweep efficiency and identifying bypassed reserves.

 The DeepLook-EM crosswell acquisition system directly measures the resistivity of the reservoir between wells up to 3,280 ft apart.

Reservoir-scale resistivity images help you understand fluid distribution and predict movement for successful reservoir management.

Both the primary magnetic field generated by the transmitter and the secondary magnetic fields resulting from the induced currents are measured by the four receiver sensors.
Both the primary magnetic field generated by the transmitter and the secondary magnetic fields resulting from the induced currents are measured by the four receiver sensors.
Both the primary magnetic field generated by the transmitter and the secondary magnetic fields resulting from the induced currents are measured by the four receiver sensors.

How it works for deeper understanding

DeepLook-EM service directly measures reservoir resistivity between two wells up to 3,280 ft apart. The transmitter antenna in one well broadcasts a continuous sinusoidal signal at a frequency from 5 Hz to 1 kHz, selected by modeling and simulation of the borehole environment, well separation, and formation resistivity. The magnetic moment produced by the transmitter is 100,000 times stronger than the source in a conventional single-well induction logging system.

The transmitter signal traverses the formation of interest between the wells at a logging speed of 2,000 to 5,000 ft/h to the receiver station in the other well. Once a complete transmitter traverse, or profile, is collected for a receiver position, the receiver tool is repositioned, and the process is repeated.

The dataset of interwell resistivity distributions is exported to a field model compiled using the Petrel E&P software platform. The resulting data integration and interpretation provide critical crosswell insight for fluid tracking of water and steam, detecting bypassed pay, and optimizing reservoir characterization.

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