Results from using the CSAMT technique to monitor the Tono UCG experiment

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6945771

Bartel, L C; Davidson, G S; Jacobson, R D; Uhl, J E

The controlled source audio-frequency magnetotelluric (CSAMT) surface electromagnetic geophysical technique was used to monitor the Tono project partial seam CRIP UCG test conducted by LLNL in cooperation with WIDCO on the WIDCO mine property near Centralia, Washington. The use of the CSAMT technique on the Tono UCG experiment was the first application of the technique to monitor an active UCG process. This test provided the opportunity to evaluate the technique and to determine if the technique could map the process on an essentially real-time basis. A grid of measuring electrodes was installed over the process area and measurements were made almost daily during the length of the 30 day test. As a completely automatic data collection system proved to be too costly and because daily manual field surveys of the required magnitude were not feasible, a combination of automatic scanning and manual surveying was selected for the test. The results of the monitoring show a changing resistivity pattern with time indicative of a changing process. The process boundary determined using the CSAMT technique agrees very well with the process boundary determined from the limited thermal data coupled with the mass balance calculations and post-test coring. The CSAMT measured resistivities respond to the movement of water during dewatering. The dewatering boundary appears to be influenced by geologic barriers such as faults and fractures and the dewatering boundary appears to determine the ultimate process boundary. 14 references, 6 figures, 1 table.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6945771
• Report Number(s): SAND-84-0873C; CONF-840835-5; ON: DE84015650
• Country of Publication: United States
• Language: English

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