Bulletin Article

Electrical and flow properties of highly heterogeneous carbonate rocks  

In reservoir engineering, hydrodynamic properties can be estimated from downhole electrical data using heuristic models (e.g., Archie and Kozeny-Carman's equations) relating electrical conductivity to porosity and permeability. Although proven to be predictive for many sandstone reservoirs, the models mostly fail when applied to carbonate reservoirs that generally display extremely complex pore network structures.

In this article, we investigate the control of the three-dimensional (3-D) geometry and morphology of the pore network on the electrical and flow properties, comparing core-scale laboratory measurements and 3-D x-ray microtomography image analysis of samples from a Miocene reefal carbonate platform located in Mallorca (Spain).

The results show that micrometer- to centimeter-scale heterogeneities strongly influence the measured macroscopic physical parameters that are then used to evaluate the hydrodynamic properties of the rock, and therefore, existing models might not provide accurate descriptions because these heterogeneities occur at scales smaller than those of the integration volume of the borehole geophysical methods. However, associated with specific data processing, 3-D imagery techniques are a useful and probably unique mean to characterize the rock heterogeneity and, thus, the properties variability.

Explorer Article

Presentation Awards Pile Up for Pyles   
Barry Friedman

Ireland has been a valuable research site for David Pyles – and his research there has been valuable for geoscientists everywhere.

AAPG Explorer: A world of information  
AAPG Explorer: News you need – now  

Explorer Emphasis

U.S. Shale Expertise Now Being Exported  
Louise Durham

Deeper targets, higher excitement: Industry enthusiasm for shale gas (and oil) plays just keeps escalating – and the interest is going global.

European Region   

A strong, integrated and active group of explorationists is still recognized as the most effective way to add value to a company by what is called "organic growth," which is very much a long-term activity.

Field Seminar

Play Concepts and Controls on Porosity in Carbonate Reservoir Analogs  
Las Negras, Spain
1-6 June 2014

The field seminar develops and evaluates the sequence stratigraphic framework and controls on location and reservoir character of Upper Miocene-Pliocene carbonate sequences from a variety of carbonate systems within the context of the regional paleogeography.

Folding, Thrusting and Syntectonic Sedimentation: Perspectives from Classic Localities of the Central Pyrenees  
Barcelona, Spain
22-26 September 2014

Participants will examine illustrative outcrops of thrusts, fault-related folds, stratal architectures and facies of depositional systems affected by growing structures, which are good analogues for hydrocarbon reservoirs. Objectives include interpreting complex thrust structures, identifying and understanding strain and fracture systems in fold-thrust belts, and analyzing patterns of growth strata in areas with synsedimentary folding.

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