What is it about?
1. We experimentally demonstated the electrical impedance (or resistivity) can be used to monitor two phase fluids, e.g., a brine/oil fluid pair or CO2/brine fluid pair, in rocks. 2. The X-ray CT imaging was used to investigate the spatial distribution of fluid and estimate the avergae fluid saturation in a representative volume. 3. We find the changes in electrical impedance (resistance and capacitance) are affected by fluid distributions in addition to the saturation. The changes in fluid distribution attributed to the non-Archie behavior.
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Why is it important?
1. Compared with conventional tests, using X-ray CT imaging, we obtained more information of fluid saturation with higher accuracy. 2. The inversion of complex impedance data using the Cole model can get a more "intrisic" resistivity and capacity that reflect the fluid charging process and polarization in a frequency range. 3. The parallell connnection factor and shape factor of fluid distritbuion are important for understanding the changes in complex resistivity. It also indicate there is a scaling problem from the microscale to continuum scale in inverting the exploration data.
Perspectives
The study partially answers the question relevant to the non-Archie behavior having been found in many previous publications. The results may important for the interpretation well logging data in a oil/brine reservoir or CO2 storage saline aquifer. The sample used in this study is a relatively clean sandstone. For other rocks with high-clay content, a similar study is deserved.
Dr. Yi Zhang
RITE
Read the Original
This page is a summary of: Effects of fluid displacement pattern on complex electrical impedance in Berea sandstone over frequency range 104-106Hz, Geophysical Prospecting, September 2016, Wiley,
DOI: 10.1111/1365-2478.12451.
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