Bulletin Article

3706
 

This article addresses the controls exerted by sedimentologic and diagenetic factors on the preservation and modification of pore-network characteristics (porosity, pore types, sizes, shapes, and distribution) of carbonates belonging to the Bolognano Formation. This formation, exposed at the Majella Mountain, Italy, is composed of Oligocene–Miocene carbonates deposited in middle- to outer-ramp settings. The carbonates consist of (1) grainstones predominantly composed of either larger benthic foraminifera, especially Lepidocyclina, or bryozoans; (2) grainstones to packstones with abundant echinoid plates and spines; and (3) marly wackestones to mudstones with planktonic foraminifera.

The results of this field- and laboratory-based study are consistent with skeletal grain assemblages, grain sizes, sorting, and shapes, all representing the sedimentologic factors responsible for high values of connected primary macroporosity in grainstones deposited on the high-energy, middle to proximal outer ramp. Cementation, responsible for porosity reduction and overall macropore shape and distribution in grainstones to packstones deposited on the intermediate outer ramp, was mainly dependent on the following factors: (1) amount of echinoid plates and spines, (2) grain size, (3) grain sorting and shapes, and (4) clay amount. Differently, in the wackestones to mudstones, laid down on the low-energy, distal outer ramp, matrix is the key sedimentologic factor responsible for low values of scattered macroporosity and dominance of microporosity. The aforementioned results may be useful to improve the prediction of reservoir quality by means of mapping, simulating, and assessing individual carbonate facies with peculiar pore-network characteristics.

Explorer Article

2000
 
Explorer Article

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1877
 
Explorer Article

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1842
 

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1771
 
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2425
 
Explorer Article

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Explorer Emphasis

2633
 
Explorer Emphasis Article

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1948
 

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Explorer Regions and Sections

2221
 

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2497
 
Explorer Regions and Sections

AAPG’s Europe Region has a new president: Welcome to Vlasta Dvorakova, who has been a very active president-elect over the past couple of years before assuming the presidential reins in June.Vlasta works for the Czech Geological Survey in Brno, Czech Republic.

Field Seminar

Naples Italy 26 September, 2015 02 October, 2015 36
 
Naples, Italy
26 September - 2 October 2015

The main part of the field seminar will focus on the description of the fractured carbonates and the extrapolation from the outcrop observations to the subsurface for building geologically plausible reservoir models.

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