Schlumberger

DeepLook-EM Crosswell Electromagnetic Imaging Service

Overview Library

Resistivity-based image surveys of the interwell space for monitoring fluid distribution and movement

Crosswell electromagnetic imaging expands the scale investigated by resistivity logging to deliver the big picture. By monitoring fluid distribution and movement on a reservoir scale, EM imaging with DeepLook-EM service gives you information critical to optimizing sweep efficiency and identifying bypassed reserves.

How it works: Acquiring EM images in wells 3,280 ft apart

DeepLook-EM crosswell electromagnetic imaging service directly measures reservoir resistivity between two wells up to 3,280 ft [1,000 m] apart. The 32.4-ft [9.88-m] 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 [600 to 1,520 m/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 Petrel seismic-to-simulation software. 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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Confirm Water Sweep Dimensions and Extent

DeepLook-EM
Instead of logging just the near-well environment, DeepLook-EM service accurately images fluid flow between boreholes up to 1,000 m [3,280 ft] apart. Read case study