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Pore-scale Heterogeneity in Meandering Fluvial Reservoirs - A Triassic Outcrop Analogue
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Diagenetically-induced heterogeneities have a major impact on reservoir properties. Near-surface and shallow-burial diagenetic processes have a substantial control on further deep-burial diagenesis, constrained by remaining porosity, and consequently on reservoir quality evolution. The present study is conducted on a Triassic outcrop analogue of heterogeneous meandering reservoirs. In a well-constrained sedimentological framework, a high resolution petrographic analysis is performed to characterize depositional and diagenetic fabrics as well as the evaluation of their collective effect on petrophysical properties. Results reveal that small-scale internal heterogeneities associated to the abundance of detrital matrix affect, in large extent, spatial distribution and intensity of the main early diagenetic processes. Furthermore, matrix distribution is strongly facies-related as a result of the hydraulic sorting effect.
Differences in diagenetic evolution among depositional facies exert a primary control on the resulting porosity (type and abundance) and permeability. By linking depositional and diagenetic features, accurate predictions and assessments of reservoir quality trends are possible.