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Reservoirs in Isolated Previous HitCarbonateNext Hit Platforms– Insight from Great Bahama Bank*

By

Paul M. (Mitch) Harris1, Gregor P. Eberli2, and G. Michael Grammer3

 

Search and Discovery Article #50083 (2008)

Posted July 30, 2008

 

*Adapted from oral presentation at 2003 AAPG International Conference and Exhibition, Barcelona, Spain.

Click to view list of articles adapted from presentations by P.M. (Mitch) Harris or by his co-workers and him at AAPG meetings from 2000 to 2008.

 

1 ChevronTexaco E & P Technology Company, San Ramon, CA ([email protected])

2 University of Miami, Comparative Sedimentology Laboratory, Miami, FL ([email protected])

3 Western Michigan University, Department of Geosciences, Kalamazoo, MI ([email protected])

 

Abstract

Studies of Great Bahama Bank (GBB), the largest isolated Previous HitcarbonateNext Hit platform in the Bahamas, continue to refine stratigraphic, depositional, and diagenetic models. These models are of particular importance in understanding the architecture and reservoir quality of reservoirs in isolated platforms.

Stratigraphic and depositional studies provide an understanding of the lateral growth potential and pulsed progradational nature of GBB. Ancestral isolated platforms coalesced to form GBB through progradation along their leeward margins by highstand shedding of bank-top derived sediment. The growth and Previous HitdiagenesisNext Hit of platform strata are intimately linked to Previous HitseaNext Hit Previous HitlevelNext Hit. The role of antecedent topography on the platform top in initiating development of both marginal reefs and sand bodies is strongly coupled to a windward margin setting. Likewise, the sedimentary make-up (grain vs. mud dominated) of proximal slope facies is dependent upon the windward/leeward orientation of the margin. Details of the genesis of platform top shallowing upward Previous HitcyclesNext Hit, coupled with the realization that unfilled accommodation space is common, add to our understanding of ancient platform equivalent strata. This nature of cycle variability suggests limitations inherent to cyclostratigraphic correlation and explains aspects of reservoir heterogeneity. Syndepositional marine cementation clearly takes place to great depths down the flanks of GBB, suggesting that paradigms associated with slope stabilization and architecture need to be revisited. The presence of “meteoric-like” moldic porosity and cementation fabrics in the marine phreatic environment deep within the platform poses the dilemma of correctly interpreting the stratigraphic context of similar diagenetic features in reservoirs. Dolomite within this same deep marine phreatic environment corroborates a model for dolomite formation that is likely typical for isolated platforms.

 

 

 

References

Anselmetti, F.S., G.P. Eberli, and Z.D. Ding, 2000, From the Great Bahama Bank into the Straits of Florida; a margin architecture controlled by Previous HitseaNext Hit-Previous HitlevelNext Hit fluctuations and ocean currents: GSA Bulletin, v. 112/6, p. 829-844.

Caspard, E., J.L. Rudkiewicz, G.P.Eberli, E. Brosse, and M. Renard, 2004, Massive dolomitization of a Messinian reef in the Great Bahama Bank: a numerical modelling evaluation of Kohout geothermal convection: Geofluids, v. 4/1, p. 40-60.

Eberli, G.P., and R.N. Ginsburg, 1987, Segmentation and coalescence of Cenozoic Previous HitcarbonateNext Hit platforms, northwestern Great Bahama Bank: Geology, v. 15, p. 75–79.

Eberli, G.P., C.G. Kendall, P. Moore, G.L. Whittle, and R. Cannon, R., 1994, Testing a seismic interpretation of Great Bahama Bank with a computer simulation: AAPG Bulletin, v. 78, p. 981-1004.

Grammer, G.M., and R.N. Ginsburg, 1992, Highstand versus lowstand deposition on Previous HitcarbonateNext Hit platform margins; insight from Quaternary foreslopes in the Bahamas: Marine Geology, v. 103/1-3, p. 125-136.

Grammer, G.M., C.M. Crescini, D.F. McNeill, and L.H. Taylor, 1999, Quantifying rates of syndepositional marine cementation in deeper platform environments--new insights into a fundamental process: Journal of Sedimentary Research, v. 69, p. 202-207.

Harris, P.M., 1979, Facies anatomy and Previous HitdiagenesisNext Hit of a Bahamian ooid sand shoal: Sedimenta VII, Comparative Sedimentology Laboratory., University of Miami, Miami Beach, Florida.

Melim, L.A., P.K. Swart, and R.G. Maliva, 1995, Meteoric-like fabrics forming in marine waters; implications for the use of petrography to identify diagenetic environments: Geology, v. 23/8, p. 755-758.

Melim, L.A., F.S. Anselmetti, and G.P. Eberli, 2001, The importance of pore type on permeability of Neogene carbonates, Great Bahama Bank: Society for Sedimentary Geology, Special Publication No. 70, Subsurface Geology of a Prograding Previous HitCarbonateNext Hit Platform Margin, Great Bahama Bank, p. 217-238.

Weber, J.L., B.P. Francis, P.M. Harris, and M. Clark, M., 2003, Stratigraphy, lithofacies and reservoir distribution, Tengiz field, Kazakhstan, in Ahr, W.M., Harris, P.M., Morgan, W.A., and Sommerville, I.D., eds., Permo-Carboniferous Previous HitCarbonateTop Platform and Reefs: SEPM, Special Publication 78, and American Association of Petroleum Geologists, Memoir 83, p. 351–394.

 

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