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coquina

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Journal Article
Published: 01 June 2023
Rocky Mountain Geology (2023) 58 (1): 1–17.
... in a gray mudstone that is mantled by a mollusk-dominated coquina that bears conodonts, palaeoniscoid scales, and actinopterygian teeth. In contrast, most studied samples are dominated by wood fragments, charcoal, cuticles, and unidentified phytoclasts—all interpreted to represent dispersed plant cuticle...
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Journal Article
Journal: AAPG Bulletin
Published: 01 December 2022
AAPG Bulletin (2022) 106 (12): 2513–2546.
... and seismic data, the primary reservoir facies are Barremian–Aptian coquinas overlain by Aptian microbialites. Coquinas deposited primarily on rift highs are laterally surrounded by finer, organic-rich facies that accumulated during rift-interval, extensional faulting. Aptian microbial laminites...
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Journal Article
Published: 27 February 2020
Journal of Sedimentary Research (2020) 90 (2): 228–249.
...Ariely L. Rigueti; Patrick Führ Dal' Bó; Leonardo Borghi; Marcelo Mendes ABSTRACT Coquinas constitute widespread deposits in lacustrine, estuarine, and shallow marine settings, where they are a valuable source of information on environmental conditions. Thick coquina successions were deposited...
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Journal Article
Journal: Interpretation
Published: 12 August 2019
Interpretation (2019) 7 (4): SH19–SH31.
... Fm. (thick sigmoidal sand bodies and tabular deltaic fronts interbedded with fluvial sediments), the Poção Fm. (conglomerates and alluvial fans related to fault scarps), the Morro do Chaves Fm. (coquinas), the Coqueiro Seco Fm. (fluvial-deltaic sands and conglomerates, lacustrine shales and halite...
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Journal Article
Journal: Geophysics
Published: 21 December 2018
Geophysics (2019) 84 (1): MR45–MR59.
... of sedimentary texture. Samples can be grouped into four texture association based on their composition and structures. (1) Bioclastic grainstone (coquinas) are characterized by an intense calcite cementation, with a nonnegligible overprint of chalcedony (the silicified spots are always several millimeters...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 2018
AAPG Bulletin (2018) 102 (7): 1343–1377.
... borehole images. In addition, the present approach does not consider possible effects of P- and S-wave anisotropy. Upper Barremian–lower Aptian coquinas (Jiquia local stage) and Aptian spherulitic carbonates (Alagoas local stage) are among the most prolific and most promising carbonate reservoirs...
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Series: AAPG Memoir
Published: 01 January 2017
DOI: 10.1306/13572006M1133685
EISBN: 9781629812762
..., in southeastern Brazil, in the ultradeep waters of the Atlantic Ocean between 1900 and 2300 m (6234 and 7546 ft) of water depth ( Figure 1 ). Initial estimates indicate the volume of oil in place to be between 8 and 12 billion BOE in carbonate reservoirs (coquinas, grainstones, and stromatolites) deposited from...
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Journal Article
Published: 01 December 2016
Bulletin of Canadian Petroleum Geology (2016) 64 (4): 516–537.
... in previous works (e.g. Davies et al., 1997 ) in order to highlight the proximal-distal trend and thereby properly identify the sedimentary environments that have similar gamma-ray facies. Foreshore “Coquina” environment (A2) and shoreface environment (A3–A3′) are represented by low gamma-ray values...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 2016
AAPG Bulletin (2016) 100 (7): 1135–1164.
... by the Loeme Salt. The upper synrift is generally limestone with widespread mollusk packstones and grainstones (coquinas) deposited in a fresh-to–moderately saline (alkaline) lake. The sag interval is characterized by carbonate platforms and silica-rich isolated buildups formed in highly evaporated, highly...
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Journal Article
Published: 01 June 2016
Journal of Sedimentary Research (2016) 86 (6): 734–748.
... Cretaceous coquina limestone, in which both optical and SEM-CL imaging produces a limited response from much of the sample. Backscattered electron (BSE) imaging typically suggests only a hint of the cement present, whereas CCI clearly displays a rich and varied cement stratigraphy. The earliest cement...
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Journal Article
Journal: Interpretation
Published: 18 April 2016
Interpretation (2016) 4 (2): SE63–SE74.
...Paulo T. L. Menezes; Jandyr M. Travassos; Marco A. M. Medeiros; Patricia Takayama Abstract Barremian lacustrine carbonates, mainly coquinas, are the reservoir rocks of the large presalt petroleum discoveries in deep to ultradeepwaters, at the southeast Brazilian margin, namely, the Santos, Campos...
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Journal Article
Published: 12 April 2016
Petroleum Geoscience (2016) 22 (2): 105–122.
...Patrick W. M. Corbett; Rayana Estrella; Andrea Morales Rodriguez; Ahmed Shoeir; Leonardo Borghi; Ana Carolina Tavares Abstract Coquinas are significant producing facies in the pre-salt reservoirs of Brazil and Angola. This paper describes an analogue model study to help understand the reservoir...
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Journal Article
Published: 01 August 2010
Vadose Zone Journal (2010) 9 (3): 653–661.
... be important for water and nutrient availability, especially for tree species, but they have not been investigated within an ecological context. We studied the capability of ground-penetrating radar (GPR) for identifying various limestone layers—the laja (0.3–2.5 m), the sascab (2.5–5 m), and the coquina (5–9...
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Journal Article
Published: 01 June 2010
Bulletin of Canadian Petroleum Geology (2010) 58 (2): 115–140.
...-être eu un effet temporisateur sur la biodiversité locale. Michel Ory Associate Editor: Murray Gingras The lower Triassic Montney Formation is a complex accumulation of shale, siltstone, sandstone and bioclastic packstone/grain-stone (coquina) and records deposition in offshore...
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Journal Article
Published: 01 November 2008
Bulletin de la Société Géologique de France (2008) 179 (6): 569–581.
...; and (ii) several single-event mass-mortality horizons associated with dacitic pyroclastic flows responsible for the preservation of high-diverse allochthonous coquinas. Our knowledge of the biodiversity patterns achieved by the benthic communities preserved in the poorly fossiliferous, siliciclastic...
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Published: 01 January 2007
DOI: 10.1130/2008.2437(11)
.... It is unsorted and is boudined. The coquina appears to be a scour fill (Fig. 5) . The scours trend southeast to northwest and are 30 cm to 50 cm in cross section and 30 cm thick. Some are isolated, whereas others are interconnected, and their tops are concordant and nearly flat. Included within this unit...
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Journal Article
Published: 01 December 2004
South African Journal of Geology (2004) 107 (4): 619–632.
... is recorded by a coquina bed deposited on a wave cut terrace, similar to other marine terraces preserved along the west and east coasts of southern Africa. Strontium isotope stratigraphy is based on the fact that the 87 Sr/ 86 Sr ratio of dissolved marine Sr has changed through geological time in response...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2003
AAPG Bulletin (2003) 87 (1): 39–70.
... (facies 1); D = erosive surface covered with intraclasts (facies 2); E = graded coquinas (facies 2); F = calci-mudstones with scour surfaces (facies 1). ( b ) Calci-mudstones with scour surfaces (facies 1). The completely dolomitized carbonate bed shows microhummocks, scour surfaces, and low-angle...
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Journal Article
Journal: GSA Bulletin
Published: 01 October 2001
GSA Bulletin (2001) 113 (10): 1249–1271.
... of a collisional marine foreland basin. We have recognized several scales of stratigraphic packages and unconformities in deposits of the Taiwan foreland basin. Small-scale (20 to 150 m thick) stratigraphic sequences contain upward-shallowing, marine lithofacies successions that are bracketed by thin coquina...
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Journal Article
Published: 01 December 2000
Bulletin of Canadian Petroleum Geology (2000) 48 (4): 339–359.
... is developed in the coquina facies at the West Stoddart and Cache Creek fields. Average porosity ranges from 6.5–9.4% for the sandsone lithofacies and 4.9–8.6% for the coquina lithofacies. Pore-occluding cements are mainly calcite in the northwestern, and dolomite and anhydrite in the southeastern, reservoirs...
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