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GEOREF RECORD

Carbonate porosity versus depth; "compaction" curve for South Florida

Robert B. Halley and James W. Schmoker
Carbonate porosity versus depth; "compaction" curve for South Florida (in AAPG annual convention with divisions SEPM/EMD/DPA, Anonymous)
AAPG Bulletin (May 1982) 66 (5): 576

Abstract

Porosity data from 15 boreholes (0 to 5,500 m) in the South Florida basin show a trend of steadily decreasing porosity with depth (Fig. 1A). This trend is interpreted to result from "compaction" of carbonates in response to overburden pressure. Compaction is used here in a broad sense to include mechanical and chemical compaction, the latter encompassing carbonate dissolution and reprecipitation as burial cement (solution-transfer of Bathurst). Factors which contribute to the scatter about the trend include variations in depositional environment, diagenetic history, pore-fluid composition, pressure, age, geothermal gradient, and experimental error. A The compaction curve for south Florida (Fig. 1A) represents a composite of curves for different carbonate lithologies, including platform-interior limestone and dolomite. Curves for limestone and dolomite (Fig. 1B) illustrate that dolomite, although less porous than limestone at shallow depths, retains more porosity than limestone during burial, and is more porous than limestone below 2,000 m. Below 4,500 m, porosity greater than 5% occurs primarily in dolomites, an observation commonly made for the deeper parts of Paleozoic sedimentary basins. B If porosity reduction were due to cement derived from dissolution at the surface or from outside the basin, the curve (Fig. 1A) would simply be a record of increasing cementation with depth. This would require the removal of between 1,000 and 1,500 m of carbonate rock from somewhere within the section or from carbonates outside the basin. It seems more likely that the cement is locally derived. If mass transfer of carbonate is limited to a local scale, then the curve is a true compaction curve.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 66
Serial Issue: 5
Title: Carbonate porosity versus depth; "compaction" curve for South Florida
Title: AAPG annual convention with divisions SEPM/EMD/DPA
Author(s): Halley, Robert B.Schmoker, James W.
Author(s): Anonymous
Affiliation: U. S. Geol. Surv., Denver, CO, United States
Pages: 576
Published: 198205
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Meeting name: AAPG annual convention with divisions SEPM/EMD/DPA
Meeting location: Calgary, AB, CAN, Canada
Meeting date: 19820627June 27-30, 1982
Summary: Y
Accession Number: 1983-009159
Categories: Sedimentary petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus.
N24°30'00" - N31°00'00", W87°30'00" - W80°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1983
Program Name: USGSOPNon-USGS publications with USGS authors
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