Crosswell electromagnetic tomography: System design considerations and field results
- Lawrence Livermore National Lab., CA (United States)
- Lawrence Berkeley Lab., CA (United States)
- Univ. of California, Berkeley, CA (United States). Dept. of Mineral Engineering
Electrical conductivity is an important petroleum reservoir parameter because of its sensitivity to porosity, pore fluid type, and saturation. Although induction logs are widely used to obtain the conductivity near boreholes, the poor resolution offered by surface-based electrical and electromagnetic (EM) field systems has thus far limited obtaining this information in the region between boreholes. Low-frequency crosswell EM offers the promise of providing subsurface conductivity information at a much higher resolution than was previously possible. Researchers at Lawrence Livermore National Lab (LLNL), and Lawrence Berkeley Laboratories (LBL), together with an industrial consortium, recently began a program to conduct low-frequency crosswell EM surveys and develop suitable inversion techniques for interpreting the data. In developing the field instrumentation the authors used off-the-shelf components whenever possible, but custom-designed induction coil transmitters and receivers were built for the field experiments. The assembled field system has adequate power for moderate to high-resolution imaging, using boreholes spaced up to 500 m apart. The initial field experiment was undertaken in flat lying terrain at the British petroleum test site in Devine, Texas.
- DOE Contract Number:
- W-7405-ENG-48; AC03-76SF00098
- OSTI ID:
- 87550
- Journal Information:
- Geophysics, Journal Name: Geophysics Journal Issue: 3 Vol. 60; ISSN GPYSA7; ISSN 0016-8033
- Country of Publication:
- United States
- Language:
- English
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