Difference between revisions of "Sorrento field: water saturation"
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| − | + | {{publication | |
| + | | image = exploring-for-oil-and-gas-traps.png | ||
| + | | width = 120px | ||
| + | | series = Treatise in Petroleum Geology | ||
| + | | title = Exploring for Oil and Gas Traps | ||
| + | | part = Predicting the occurrence of oil and gas traps | ||
| + | | chapter = Predicting reservoir system quality and performance | ||
| + | | frompg = 9-1 | ||
| + | | topg = 9-156 | ||
| + | | author = Dan J. Hartmann, Edward A. Beaumont | ||
| + | | link = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm | ||
| + | | pdf = | ||
| + | | store = http://store.aapg.org/detail.aspx?id=545 | ||
| + | | isbn = 0-89181-602-X | ||
| + | }} | ||
| + | |||
| + | The Sorrento field is in Cheyenne County, southeastern Colorado on the north flank of the Las Animas arch. This case study is a summary of a larger study by Hartmann and Coalson.<ref name=Hartmannandcoalson_1990>Hartmann, D. J., and E. B. Coalson, 1990, Evaluation of the Morrow Sandstone in Sorrento field, Cheyenne County, Colorado, ''in'' S. A. Sonnenberg, L. T. Shannon, K. Rader, W. F. von Drehle, and G. W. Martin, eds., Morrow sandstones of Southeast Colorado and Adjacent Areas: Rocky Mountain Association of Geologists Symposium, p. 91-100.</ref> This study of cores and logs from four field wells shows how multiple oil–water contacts and apparent anomalies in saturation profiles in the Sorrento field are due to multiple flow units from two separate reservoirs. This example useful for finding other traps in the same formation. | ||
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| + | [[Morrow]] sandstone [[reservoir]]s display multiple [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=oil-water%20contact oil-water] contacts in several fields in the area <ref name=Sonnenbergetal_1991>Sonnenberg, S. A., D. J. McKenna, and P. J. McKenna, 1991, Sorrento field—U.S.A. Denver Basin, Colorado, "in" N. H. Foster and E. A. Beaumont, eds., Stratigraphic traps II: AAPG Treatise of Petroleum Geology, Atlas of Oil and Gas Fields, p. 305–328.</ref> Reliably recognizing separate reservoirs in a field requires considering [[capillary pressure]]s, [[Free water level|heights above free water]], and observed [[water saturation]]s. One convenient way to do this is to plot water saturation (S<sub>w</sub>) against structural elevation while differentiating [[Pore and pore throat sizes|pore throat sizes]]. | ||
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| + | ==S<sub>w</sub>-elevation plot== | ||
| + | An S<sub>w</sub>-elevation plot ([[:file:predicting-reservoir-system-quality-and-performance_fig9-95.png|Figure 1]]) for study wells 4, 8, and 11 defines a trend of decreasing [[water saturation]] with increasing height. Well 1 is not on the same trend. Differences in water saturation attributable to differences in [[capillary pressure]]s are apparent but are not great enough to explain the discrepancy. Ignoring possible hydrodynamic effects, the difference in trends probably represents two separate oil columns and therefore two reservoirs. | ||
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| + | [[file:predicting-reservoir-system-quality-and-performance_fig9-95.png|left|400px|thumb|{{figure number|1}}From Hartmann and Coalson.<ref name=Hartmannandcoalson_1990>Hartmann, D. J., and E. B. Coalson, 1990, Evaluation of the Morrow sandstone in Sorrento field, Cheyenne County, Colorado, ''in'' S. A. Sonnenberg, L. T. Shannon, K. Rader, W. F. von Drehle, and G.W. Martin, eds., Morrow Sandstones of Southeast Colorado and Adjacent Areas: RMAG Symposium, p. 91-100.</ref> Courtesy Rocky Mountain Association of Geologists.]] | ||
| + | {{clear}} | ||
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| + | ==See also== | ||
| + | |||
| + | * [[Setting and structure of the Sorrento field]] | ||
| + | * [[Morrow lithofacies and pore types]] | ||
| + | * [[Sorrento water saturation calculations]] | ||
| + | * [[Petrophysical analysis of Sorrento field wells]] | ||
| + | |||
| + | ==References== | ||
| + | {{reflist}} | ||
| + | |||
| + | ==External links== | ||
| + | {{search}} | ||
| + | * [http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm Original content in Datapages] | ||
| + | * [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store] | ||
| + | |||
| + | [[Category:Predicting the occurrence of oil and gas traps]] | ||
| + | [[Category:Predicting reservoir system quality and performance]] | ||
Revision as of 19:52, 3 July 2014
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Predicting reservoir system quality and performance |
| Author | Dan J. Hartmann, Edward A. Beaumont |
| Link | Web page |
| Store | AAPG Store |
The Sorrento field is in Cheyenne County, southeastern Colorado on the north flank of the Las Animas arch. This case study is a summary of a larger study by Hartmann and Coalson.[1] This study of cores and logs from four field wells shows how multiple oil–water contacts and apparent anomalies in saturation profiles in the Sorrento field are due to multiple flow units from two separate reservoirs. This example useful for finding other traps in the same formation.
Morrow sandstone reservoirs display multiple oil-water contacts in several fields in the area [2] Reliably recognizing separate reservoirs in a field requires considering capillary pressures, heights above free water, and observed water saturations. One convenient way to do this is to plot water saturation (Sw) against structural elevation while differentiating pore throat sizes.
Sw-elevation plot
An Sw-elevation plot (Figure 1) for study wells 4, 8, and 11 defines a trend of decreasing water saturation with increasing height. Well 1 is not on the same trend. Differences in water saturation attributable to differences in capillary pressures are apparent but are not great enough to explain the discrepancy. Ignoring possible hydrodynamic effects, the difference in trends probably represents two separate oil columns and therefore two reservoirs.
Figure 1 From Hartmann and Coalson.[1] Courtesy Rocky Mountain Association of Geologists.
See also
- Setting and structure of the Sorrento field
- Morrow lithofacies and pore types
- Sorrento water saturation calculations
- Petrophysical analysis of Sorrento field wells
References
- ↑ 1.0 1.1 Hartmann, D. J., and E. B. Coalson, 1990, Evaluation of the Morrow Sandstone in Sorrento field, Cheyenne County, Colorado, in S. A. Sonnenberg, L. T. Shannon, K. Rader, W. F. von Drehle, and G. W. Martin, eds., Morrow sandstones of Southeast Colorado and Adjacent Areas: Rocky Mountain Association of Geologists Symposium, p. 91-100. Cite error: Invalid
<ref>tag; name "Hartmannandcoalson_1990" defined multiple times with different content - ↑ Sonnenberg, S. A., D. J. McKenna, and P. J. McKenna, 1991, Sorrento field—U.S.A. Denver Basin, Colorado, "in" N. H. Foster and E. A. Beaumont, eds., Stratigraphic traps II: AAPG Treatise of Petroleum Geology, Atlas of Oil and Gas Fields, p. 305–328.
External links
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