Fracture Characterization via Electrical Impedance and Resistance
Abstract/Contents
- Abstract
- The electrical impedance and resistance of several sandstones with and without fractures and initially saturated with 1% brine solution have been measured at four frequencies covering three orders of magnitude. Plots of the data with respect to water saturation have been used to characterize the relationship between fractures in rock and the measured electrical properties of the rock. Data have been compared with previous work involving similar measurements and found to differ. Several analytical circuit models have been developed to explain the results obtained in this research and relate the electrical response to fracture content more quantitatively than has been done in previous work. One unfractured sandstone has been cut into a cube shape and subjected to electrical impedance and resistance measurements over the course of evaporation. Two simulated fractures have been created in the cube with repeated experimentation before and after the creation of each fracture. A model, consisting of a resistor in series with a capacitor and resistor in parallel, has been chosen as the most accurate model and used to characterize all the data acquired from experimentation on the sandstone cube. These experiments have verified that the presence of at least one fracture introduces a frequency dependence to the measured impedance and resistance of the rock at very low saturations. However, quantifying this behavior in more detail—specifically with regard to the number and size of fractures present—has proven difficult.
Description
| Type of resource | text |
|---|---|
| Date created | June 2013 |
Creators/Contributors
| Author | Valverde, Lawrence Rene |
|---|---|
| Primary advisor | Horne, Roland N. |
| Degree granting institution | Stanford University, Department of Energy Resources Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Valverde, Lawrence Rene. (2013). Fracture Characterization via Electrical Impedance and Resistance. Stanford Digital Repository. Available at: https://purl.stanford.edu/kn280cc4680
Collection
Master's Theses, Doerr School of Sustainability
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