Short Courses and Conferences

Second International Workshop on Induced Polarization in Near-Surface Geophysics

October 31 - November 2, 2011

Field Trip

For those interested, a short field trip will be taken on the morning of November 3rd to demonstrate the use of Mount Sopris Instrument's borehole induced polarization logging tool. The tool (QL40-ELOG4/IP) will be run in a test well near the Colorado School of Mines campus that traverses a sand/shale/lime sequence associated with the Dakota Hogback and its associated lithological sequence. Logging data will be compared to other available data collected within the same well, such as acoustic televiewer data (example attached), to highlight the value of IP logging in such environments.

The trip will last approximately 3-hours. Transportation, coffee, and pastries will be provided. Warm clothes are recommended. The trip will begin at Green Center on the campus of Colorado School of Mines on Thursday, November 3, 2011 at 9:00 AM (time tentative – check with Workshop personnel for specific time). There is no cost for the Field Trip.

The QL40-IP sub provides 4 normal resistivity measurements, plus spontaneous potential (SP) and single point resistance. In addition, the IP function provides 2 digital IP channels. The IP uses the 16 and 64 inch electrodes as receivers, and the current electrode as an IP charging source. The probe measures the injection and relaxation voltages on both measure electrodes as a function of time. This measurement is digitized and presented as 10 channels of time based data per depth interval for each spacing. In addition, a high resolution A/D further breaks each channel into 10 more discrete samples, providing a "full wave" presentation of the injection and relaxation decay. The resultant data are combined with data from other subs (if present in the stack). The data is then transmitted up the wireline using a pulse coded digital data protocol.

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