Analysis of the Carbon-Oxygen Log
Abstract/Contents
- Abstract
- A study is presented on the analysis of induced gamma ray spectroscopy logs. This report reviews the current interpretation methods and presents a cross-plotting technique to compute hydrocarbon saturation. Most published studies on these logs provide only a semi-quantitativeanalysis with little theoretical basis. This technique follows a theoretical model proposed by previous investigators. The technique assumes that:1) Each reservoir component (i.e., matrix lithologies and fluids) has a specific ratio of elemental ratios; and2) The total log response is a linear function of each ratio in the matrix, the Wdrocarbon, the formation water, and the shale.The cross-plotting technique has three unknowns: porosity, volumetric fraction of shale, and oil saturation. Porosity and volumetric fraction of shale are obtained from a standard set of open holelogs. Oil saturation is then computed from a linear equation that approximates the bulk carbon-to-oxygen (C/O) response. The equation contains four terms representing both matrix and fluid responses in the reservoir. The coefficient of 'each term is obtained from one of the following cross-plots:The only constraint upon this approach is that porosity must be fairly constant in the reservoir t o apply the C/O vs Ct^(1/2) cross-plot. However, for most non-carbonate reservoirs of good porosity this constraint should not be of great concern. An example is given using the empirical, cross-plotting approach. The example is from an observation well of a steam-foam pilot in Kern County, California. The Dresser Atlas "Continuous Carbon/Oxygen Log TM is being run periodically in the observation wells of this pilot to monitor the recovery process. A comparison is made between the cross-plot method and other methods now used by Dresser Atlas.
Description
| Type of resource | text |
|---|---|
| Date created | August 1982 |
Creators/Contributors
| Author | O'Brien, William Jay |
|---|---|
| Primary advisor | Sanyal, Subir K. |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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- User agrees that, where applicable, content will not be used to identify or to otherwise infringe the privacy or confidentiality rights of individuals. Content distributed via the Stanford Digital Repository may be subject to additional license and use restrictions applied by the depositor.
Preferred citation
- Preferred Citation
- O'Brien, William Jay. (1982). Analysis of the Carbon-Oxygen Log. Stanford Digital Repository. Available at: https://purl.stanford.edu/qh700qy9278
Collection
Master's Theses, Doerr School of Sustainability
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