Formation Evaluation con't 5

Deep Reading Technologies

Enhanced Interwell Resolution Through Crosswell Imaging

The Schlumberger Deep Reading initiative helps you better understand your reservoir by using direct physical measurements of the interwell space. Crosswell electromagnetic imaging and crosswell seismic imaging take you beyond the confines of the near-wellbore volume to illuminate the wider reservoir volume for numerous applications:

• Reservoir characterization: higher resolution measurements of porosity, lithology, and resistivity within an expanded scope of fluid identification, structure determination, and detection of bypassed pay
• Fluid front monitoring: water, steam, and gas injection, CO₂ sequestration, and permanent monitoring of production and injection.

DeepLook-CS

Crosswell seismic imaging

Crosswell seismic imaging of reservoir layers delivers up to 100 times the resolution of surface seismic data by placing both the receivers and source in adjacent wells and imaging the interwell volume. Both direct arrival and reflected information can be processed to provide a detailed subsurface image of the reservoir or zone of interest. Crosswell seismic data improves the understanding of the reservoir geometry and rock properties from the reflection seismogram and details of fluid migration, including steam chambers, from both the velocity tomography and reflection seismogram.

DeepLook-EM

Crosswell Electromagnetic Imaging Service

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 the DeepLook-EM system gives you information critical to optimizing sweep efficiency and identifying bypassed reserves.

How it works

Conventional logging is restricted to the near-wellbore volume. The DeepLook-EM enhanced crosswell electromagnetic imaging system illuminates the wider reservoir volume with a transmitter tool deployed in one well and a receiver tool deployed in a second well. EM imaging can be conducted between two wells located up to 1,000 m apart, depending on the well completions and the formation and resistivity contrasts.