Heterogeneity, paleohydrology, and 3D facies architecture of ancient point bars, Ferron Sandstone, Notom Delta, South-central Utah

Qualitative fluvial facies models have greatly enhanced the ability in predicting the distribution of architectural elements and corresponding depositional features within a fluvial system. However, because of the spatial limitation of 2D outcrops, on which most ancient fluvial studies are based, quantitative models with emphasis on 3D distribution of heterogeneity, paleohydrology, and 3D facies architecture still remains undeveloped.

Fluvial studies in the past have been mainly focused on mathmatical modeling, flume simulation, ancient outcrop, and modern fluvial deposits studies. Only a few studies are able to combine these different fields to make a comprehensive investigation of fluvial deposits. However, sedimentary processes are physical processes in nature that only by understanding the paleohydrological condition which contribute to the morphologyof fluvial deposits that preserved in rock record, can we develop more quantitative fluvial facies models.

This research intends to test Willis' model of temporal and spatial variation of point bars by studying the ancient point bars from Ferron Sandstone Notom Delta, which present extensive plan view exposures and some vertical cliff faces. Field works, such as collection of paleocurrent data, photo mosaics of vertical exposures, documentation of plan view grain size variation, and GPR surveys, will be conducted to calculate paleohydraulic parameters, analyze fluvial bedding styles and heterogeneity, and reconstruct 3D facies architecture of ancient meander belts.

Ultimately, hydraulic models and fluid flow simulation models can be better constrained to provide more precise modeling results for meander point bars and enhance corresponding conventional oil or gas production.