1887

Abstract

Summary

Several studies have been published assessing the effect of unconformities on reservoir quality and whether there is any relationship between the presence of unconformity surfaces and diagenetic processes above and below these unconformities. Some studies have suggested a direct relationship between the presence of these surfaces and reservoir quality. Whereas, others argue against the existence of such relationship. In this study both hypotheses were examined by evaluating the role of the Base Cretaceous unconformity in the distribution of porosity and kaolinite in Middle Jurassic Brent Group sandstones of the Tampen Spur area, Northern North Sea. The petrographic analysis results indicate that the dissolution of framework grains and carbonate cement are the main source of the generated secondary porosity and authigenic kaolinite within Brent Group sandstones. Detailed petrographic analysis, using both optical microscopy and Scanning Electron Microscopy (SEM), was undertaken on 43 core samples from selected wells in the Tampen Spur region.

The study demonstrates no marked effect of the unconformity surface on the underlying reservoir rock in this region of the North Sea. It is suggested that any such effects that may be noted elsewhere are most likely to be a localised phenomenon.

© EAGE Publications BV
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2025-02-26
2026-02-10

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References

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/content/papers/10.3997/2214-4609.202534006
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Has the Base Cretaceous Unconformity Affected Reservoir Quality of the Underlying Brent Group Sandstones,Tampen Spur,North Sea
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202534006
/content/papers/10.3997/2214-4609.202534006
/content/papers/10.3997/2214-4609.202534006
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