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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
Influence of Shale Distribution Types on the Effective Porosity of Sandstone Reservoirs
Abstract
Most previous work that analyzed the effect of the three distribution types of shale—dispersed, structural, and laminar—within a sandstone reservoir only considered quantification using either single-type distribution or either laminar-dispersed or laminar-structural two-type distribution models. Only recently has it been quantitatively analyzed for the third two-type distribution model, namely structural-dispersed, and the implications of three-type distribution by using a straightforward deterministic approach, involving total porosity versus shale volume graphical crossplot and mathematical analysis. We derived the relationships within an effective porosity versus shale volume system and tested the methodology using a case study with conventional triple-combination, as well as nuclear magnetic resonance log data. Results indicated in this case study that, although the dominant shale distribution type was laminar shale, the presence of dispersed shale reduced the sandstone-fraction effective porosity and the presence of structural shale further reduced the useful sandstone-fraction porosity, as opposed to a laminar-dispersed or laminar-structural model that would yield the most optimistic result.
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