Michael Drummond is sedimentologist/stratigrapher and petrographer with more than 25 years of working on both clastic and carbonate successions, mostly in the Tethyan to Middle East area. He has been involved in geological reservoir description and geological evaluation of reservoir successions to help understand the controls on petrophysical properties for reservoir rock-typing of both clastic and carbonate sediments. Studies have ranged from single wells to field reviews. In all cases he has sought to improve client understanding of the geological controls on reservoir quality and simplify the interpretation to a level suitable for input to a reservoir model. Michael currently works for Fronterra Integrated Geosciences mostly on borehole image interpretation with emphasis on the sedimentological aspects of image analysis.

Abstract

Rock in Reservoir Rock-typing
Dr Michael E. Drummond

Geologists like rock, petrophysicists like wireline logs and core analysis results, and reservoir engineers like to have a production history. These three disciplines need to work together to produce a reservoir model, and that model requires reservoir rock types. All natural hydrocarbon reservoirs occur in rocks so geological data should be considered carefully in any reservoir rock-typing study.

Core description, if performed in sufficient detail not only helps to indicate candidate reservoir rock types, a good core description provides valuable information on the likely thickness and distribution of reservoir rock types. Core description provides the. geological framework for populating the reservoir model away from the cored wells. Good core description also provides valuable quality control information on both the core and any plugs that are taken from the core. When carefully integrated with advanced rock property studies it aids in up-scaling. Quality control aspects of core description are also vital in improving the quality of core and core plugs.

Geologists describing core should bear in mind the end users and be able to simplify data to a scale suitable for the petrophysicists and reservoir engineers.

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