AAPG ERC Cyprus 2017

Integration of Analogs in Reservoir Characterization of Tertiary Carbonate Build-ups and New Insights into the Cretaceous Karstic Play in the Offshore Apulian Platform_ Adriatic Foreland

This talk will be of particular interest to those looking for new opportunities within the Mediterranean region and also for anyone involved in the evaluation of carbonate reservoirs. When evaluating carbonate reservoirs we are often confronted with a limited amount of data and with the difficulty of predicting significant lateral variations of rock properties.

 In this presentation it will be illustrated and discussed an example of an oil discovery where an hydrocarbon column may have been missed as result of very limited data: the well could not be tested due to drilling difficulties and no reliable petrophysical evaluation could be conducted due to incomplete log suite and resistivity logs affected by significant mud losses. It will be shown how a critical re-evaluation of the oil shows also from a geochemical perspective (from cores and from the surface of the coring tool) can be used to gather additional information on the reservoir including the likely presence of intra-formational sealing units (associated with palaeo-exposure events) which are likely below the resolution of the logs. As result closures with OWCs deeper than expected are possible and in-place hydrocarbon volumes could be significantly larger than previously expected (.....).

The Giove discovery provides another example of reservoir evaluation challenges associated with carbonate reservoirs. In order to plan an effective appraisal programme, the key challenge in this case is to characterize the petrophysical properties of the oil bearing zone: only one well was drilled through the oil leg on the flank of this Oligo-Miocene build-up (lagoonal environment), the core of the structure was evaluated by the first well which only reached the gas bearing zone and was abandoned prematurely due to drilling difficulties. There are significant similarities between the Giove structure and the Malampaya carbonate build-up in the Philippines in terms of lithofacies and tectono-stratigraphic evolution. Given the limited data in the Giove Field, the integration of analogs has proven to be of fundamental importance to constrain depositional processes, the interplay between tectonics and sedimentation and the facies distribution in the Giove Field.

About the Speaker

Carlo Caldarelli - Northern Petroleum Plc

Carlo Caldarelli received his B.Sc.(Hons.) degree in Geology at the University of Birmingham in 2007. Since 2009 he joined Northern Petroleum where he currently holds the position of Project Geologist. He is experienced in both exploration and production geology and he is currently responsible for providing integrated reservoir modelling studies of Devonian carbonate reefs in Northern Alberta (Canada), the key producing oil & gas asset of the company. 

Carlo is also the author of several published studies on Mediterranean geology, examples include the development of an integrated petroleum systems model for the offshore Sicily Thrust Belt during a joint venture with Shell and new insights into the basin evolution and maturity modelling in the Southern Adriatic.

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