East Breaks seal rock
Description
The deepwater sands of the Glob alt reservoir are encased in hemipelagic mudstones and have a top seal associated with the condensed section of the Glob alt depositional cycle.[1] The well-log cross section in Figure 1 shows the correlation of the Glob alt sandstones. The top seal, which occurs above the log cross section, is a major mudstone condensed interval coincident with the Glob alt datum labeled on Figure 2. Precondensed section mudstones encasing the Glob alt sandstones provide local top seal and lateral seal.
Effectiveness
[[File:Sedimentary-basin-analysis_fig4-25.png|thumb|300px|Figure 3 Correlation of the the third-order eustatic curve of Haq et al[2] and the oxygen isotope curve of William and TrainorCite error: Closing </ref>
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tag cycle chart (Figure 3).
Despite its regional extent and thickness, hydrocarbons have leaked upward into the Hyal B and Trim A reservoirs, most probably along faults during intervals of fault movement with consequent dilation of fracture networks along the fault
Carrier beds and seal evaluation
Impermeable rocks also affect migration pathways. Porous and permeable beds bounded above and below by impermeable rocks can provide highly effective hydrocarbon carrier beds.
See also
References
- ↑ Armentrout, J., M., 1991, Paleontological constraints on depositional modeling: examples of integration of biostratigraphy and seismic stratigraphy, Pliocene–Pleistocene, Gulf of Mexico, in Weimer, P., Link, M., H., eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 137–170.
- ↑ Cite error: Invalid
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