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.
Added on 28 February, 2013
What would you give for an early detection system for earthquakes? Detecting those first waves of compression could help.
Added on 01 September, 2012
Using a combination of certain seismic techniques helped bring success to a team of fracture-hunting geoscientists.
Added on 01 April, 2012
Technical award winners have been announced for the 2011 AAPG International Conference and Exhibition, held last October in Milan, Italy.
Added on 01 February, 2012
Hall of Fame: Italy’s majestic Dolomites have been designated a UNESCO World Heritage Site, thanks to the efforts of a dedicated team of geologists – including an AAPG member who knows the region like the back of his hand.
Added on 01 January, 2012
Among the unique features of this year’s AAPG International Conference and Exhibition (ICE) in Milan will be the working models of Leonardo da Vinci’s own creations on display.
Added on 01 October, 2011
Sometimes the best seismic data acquisition system for a job is a combination of two.
Added on 01 September, 2013
A new report from the U.K., headed by a petroleum geologist who's familiar to AAPG audiences, recommends caution and some restrictions for use of hydraulic fracturing in new areas.
Added on 01 July, 2012
Explorer Regions and Sections
Nearly 200 attendees from 29 countries attended the inaugural APPEX Regional 2012 event, held Nov. 8-9 in Istanbul, Turkey, and organized in association with Turkey’s National Oil Company, TPAO.
Added on 01 December, 2012
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.
Added on 01 December, 2011