--> --> Using Sequence Stratigraphy to Optimize Target Selection in Tight Sandstone Reservoirs of the Rockies (and Beyond)

AAPG Rocky Mountain Section Meeting

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Using Sequence Stratigraphy to Optimize Target Selection in Tight Sandstone Reservoirs of the Rockies (and Beyond)

Abstract

Sequence stratigraphy is not THE answer in optimizing the selection of horizontal targets in tight sandstone reservoirs. But it is an extremely useful, and oftentimes necessary, tool that should be used to assess potential reservoir intervals and improve geosteering. Sequence stratigraphy can aid subsurface geologic interpretation and evaluation in numerous ways. It (1) provides an increased understanding of depositional controls on reservoir vs. non-reservoir facies, (2) promotes better well-log correlations, (3) aids in reservoir prediction, (4) offers a framework for data integration, (5) guides sample collection from core, (6) delivers better reservoir flow models and volumetric calculations, (7) helps in choosing and staying within the target zone, and (8) furnishes input for completion design. This talk focuses on three aspects of optimizing target selection and horizontal drilling in tight sandstone reservoirs based on sequence stratigraphic concepts. First, the importance of establishing accurate correlations based on flooding surfaces and parasequences when selecting a target and landing the wellbore is demonstrated for the Baxter and Parkman sandstones. Second, the significance of reservoir compartmentalization relative to reservoir modeling and economic evaluation in highstand vs. falling stage systems tracts is described for the Viking, Woodbine, Sussex, and Frontier-Turner systems. Finally, identifying different types of erosional surfaces and their impact on hydrocarbon production and the placement of laterals are highlighted for the Frontier-Turner and Three Forks-Bakken intervals.