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Badley Ashton are pleased to announce that he has been invited to give a presentation on microporous limestones. This will take place on Tuesday the 21st of March from 5pm at the ADMA-OPCO Auditorium in Abu Dhabi (the presentation is scheduled to begin at 5:30pm). A brief abstract is given below. You can find out more about the Emirates Society of Geosciences and their activities here.
Characterisation and Predictability of Microporous Limestones: Lessons from Four Decades of Progress in Hydrocarbon Reservoirs.
A vast majority of the limestone deposits over the world (including marine and lacustrine facies) are made up of extremely fine-grained and lithified carbonate mud (particles <10μm, generally called micrite or micritic matrix). Such deposits host a variably developed micropore and nanopore-dominated pore system (pores <10μm and <1μm, respectively), which can have large storage capacities (ie. porosity volume), locally equivalent to coarser grained and macroporous deposits, and can locally retain permeabilities that make them viable aquifers or hydrocarbon reservoirs. Such deposits have been described in most of the key worldwide hydrocarbon plays, either within conventional reservoirs (eg. North Sea chalk, Shuaiba and Mishrif Formations in the Middle East, etc), or in unconventional reservoirs (eg. Niobrara chalks) and aquifers. Moreover, long term diffusion of fluids through this very small and complex pore system is also a key issue for the storage of CO2 or industrial wastes as the diffusive and geomechanical properties of microporous carbonates can be extremely variable and different from more 'standard' deposits and siliciclastic rocks.
Despite almost 40 years of international research, the characterisation and the origin of these microporous deposits remains challenging, mainly due to the high resolution observation tools needed for the study of these micron-scale facies. The aim of this talk is to present recent advances in the characterisation and prediction of microporous carbonate deposits. Clearly defined and readily applicable petrographical classifications provide the basis for a good understanding of how the sediment evolved through time and space in a particular sedimentological formation, which, in turn is critical for understanding the variations in reservoir properties and their compartmentalisation within reservoirs. Finally, this presentation will aim to establish conditions to explain how, why and where microporous and tight carbonates can be find in order to help with their upscalling, modelling and exploration, with a particular attention to the influence of exposure surfaces and associated diagenesis affecting neritic shallow marine limestones.