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Caprock and Shale Gas Characterization - Appropriate Petrophysical Methods and Integration with Log Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fourth EAGE Shale Workshop, Apr 2014, Volume 2014, p.1 - 5
Abstract
Summary
The characterization of caprocks and gas shales is very similar and cannot be performed using conventional petrophysical techniques. Even for basic properties such as porosity and permeability, appropriate protocols and instrumentation are required. We present a summary of the experience accumulated during several years on samples for which measurements were believed too inaccurate or too long and costly before the new techniques described below were used. For porosity, tortuosity and connectivity of the pore space, we heavily rely on single and multidimensional NMR techniques with an appropriate instrument. For permeability, we developed an efficient steady-state technique for both water and gas effective permeability. For the visualisation of the pore space, we rely on recent microscopy techniques (FIB) that are appropriate at nanometre scale. Finally, at larger scale, standard log data should also be considered very carefully and improved existing methods for estimating porosity by NMR should be used systematically.
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