--> Abstract: The spatial variability and distribution of early diagenetic processes along super surfaces of inland, siliciclastic erg deposits</span>
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The spatial variability and distribution of early diagenetic processes along super surfaces of inland, siliciclastic erg deposits

Melody Bergeron

Montana State University, Department of Earth Sciences

Bozeman, MT USA

[email protected]

Understanding the variability and distribution of early diagenetic processes and products and their affect on fluid flow along super surfaces is important for improving our understanding of fluid flow in the subsurface (hydrocarbon recovery, CO2sequestration, etc.) in eolian reservoirs. The presence of a super surface in an eolian reservoir may provide a potential barrier to fluid flow depending upon the history of deposition, burial, and Previous HitdiagenesisNext Hit. The diagenetic processes and products of super surfaces have not been described in the literature; however, the diagenetic history, variability, and distribution of such products would affect fluid flow and create heterogeneity in the reservoir.

This study focuses on early Previous HitdiagenesisNext Hit, including syndepositional Previous HitdiagenesisNext Hit, along super surfaces in Utah (J-2 unconformity atop the Jurassic Navajo Previous HitSandstoneNext Hit) and in Namibia (super surface atop the Tertiary Tsondab Previous HitSandstoneNext Hit and a modern super surface forming on the southern Namib Desert). The super surfaces of these inland, siliciclastic erg deposits formed under a variety of conditions and will be used for making comparisons between different types of super surfaces. Outcrops will be mapped for bounding surfaces, Previous HitdepositionalNext Hit environments and cross-strata types and sampled above and below the super surfaces for diagenetic event comparisons. Diagenetic features will be described at various scales (dune/interdune, cross-stratification type, and inter-stratification) using petrographic analysis, SEM/FEM, CL, and XRD. Cement composition, texture and stable isotopes will also be used to determine the hydrologic regime and its Previous HitinfluenceNext Hit on the formation of the J-2 unconformity and the super surface atop the Tsondab Previous HitSandstoneTop.

AAPG Search and Discovery Article #90060©2006 AAPG Foundation Grants-in-Aid