Difference between revisions of "Diagenetic impact on traps"
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+ | [[file:exploring-for-stratigraphic-traps_fig21-5.png|left|thumb|{{figure number|1}}From unpublished data by R.C. Tobin, 1987.]] | ||
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Stratigraphic trap geometries can be mapped and defined at any geologic scale from an interpretation of fades in seismic or well data, but diagenetic overprints often modify primary trapping geometries. Diagenetic changes often can be predicted and mapped reliably, especially if they follow fades or paleostructure. However, if diagenesis does not follow fades or paleostructure, then the exploration and exploitation risk increases because predicting the trap location is more difficult. | Stratigraphic trap geometries can be mapped and defined at any geologic scale from an interpretation of fades in seismic or well data, but diagenetic overprints often modify primary trapping geometries. Diagenetic changes often can be predicted and mapped reliably, especially if they follow fades or paleostructure. However, if diagenesis does not follow fades or paleostructure, then the exploration and exploitation risk increases because predicting the trap location is more difficult. | ||
==Example== | ==Example== | ||
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Access to core, samples, and modern wireline log suites greatly facilitates subsurface interpretation. In [[:file:exploring-for-stratigraphic-traps_fig21-5.png|Figure 1]], both lateral and top seals in the dolomite reservoir were created by anhydrite cementation during early diagenesis. Primary fades changes do not control the location of the trap. | Access to core, samples, and modern wireline log suites greatly facilitates subsurface interpretation. In [[:file:exploring-for-stratigraphic-traps_fig21-5.png|Figure 1]], both lateral and top seals in the dolomite reservoir were created by anhydrite cementation during early diagenesis. Primary fades changes do not control the location of the trap. |
Revision as of 19:51, 22 January 2014
Exploring for Oil and Gas Traps | |
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Series | Treatise in Petroleum Geology |
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Part | Predicting the occurrence of oil and gas traps |
Chapter | Exploring for stratigraphic traps |
Author | John C. Dolson, Mike S. Bahorich, Rick C. Tobin, Edward A. Beaumont, Louis J. Terlikoski, Michael L. Hendricks |
Link | Web page |
Store | AAPG Store |
Stratigraphic trap geometries can be mapped and defined at any geologic scale from an interpretation of fades in seismic or well data, but diagenetic overprints often modify primary trapping geometries. Diagenetic changes often can be predicted and mapped reliably, especially if they follow fades or paleostructure. However, if diagenesis does not follow fades or paleostructure, then the exploration and exploitation risk increases because predicting the trap location is more difficult.
Example
Access to core, samples, and modern wireline log suites greatly facilitates subsurface interpretation. In Figure 1, both lateral and top seals in the dolomite reservoir were created by anhydrite cementation during early diagenesis. Primary fades changes do not control the location of the trap.
See also
- Stratigraphic traps
- Exploring for stratigraphic traps
- Importance of stratigraphic trap seals
- Importance of scale