Bulletin Article

 

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.

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Explorer Article

 
Since the dramatic expansion of AAPG/ AAPG Foundation’s Visiting Geoscientist program in the fall of 2014, thousands of students around the globe have benefited from it.
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What would you give for an early detection system for earthquakes? Detecting those first waves of compression could help.

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Using a combination of certain seismic techniques helped bring success to a team of fracture-hunting geoscientists.

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Explorer Division Column EMD

 

The Energy and Minerals Division of the AAPG focuses on unconventional hydrocarbon energy resources, such as coalbed methane and gas hydrates and alternative energy resources, such as coal, uranium and geothermal energy. These resources are important to members of AAPG.

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Explorer Emphasis

 

Sometimes the best seismic data acquisition system for a job is a combination of two.

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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.

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Explorer Regions and Sections

 
It has been an interesting and eventful year in Europe for AAPG. With all the less-than-good news around, we felt it was important to maintain a program of events and activities throughout the year. Although we are constrained by the events in the industry we have still tried to match the wishes of the members.
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AAPG Europe’s latest Geosciences Technology Workshop (GTW), “Fractured Reservoirs: The Geological, Geophysical and Engineering Tools to Crack Them,” provided the opportunity to visit the island of Sicily, steeped both in beauty and an active geological history. And what is a trip to Sicily without a visit to the tallest volcano in Europe?
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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.

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Field Seminar

Naples Italy 01 October, 2016 07 October, 2016 36
 
Naples, Italy
1-7 October 2016

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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