Characterization of Lateral Accretion Packages by Ground Penetrating Radar and Outcrop Characterization, Jackfork Group, Hollywood Quarry, Arkansas

Hydrocarbon reservoirs consisting of turbidite deposits are commonly more complex than anticipated because of fine-scale sedimentary heterogeneities which may complicate the reservoir characteristics and flow of reservoir fluids (Labourdette, 2007). One such heterogeneity is a Lateral Accretion Package (LAP) associated with deepwater sinuous channel sandstones. The geometry and lithology distribution of LAPs are important due to their influence on static connectivity and reservoir performance.

The objective of this research was to characterize the geometry and characteristics of in-channel lateral accretion packages exposed along the east wall of Hollywood Quarry, Arkansas using 2D Ground Penetrating Radar (GPR) profiles acquired on the top of the outcrop, as well as to build a geological model which includes such heterogeneities.

Validation of the GPR profiles was provided by periodic blasting activity which exposed walls that were not exposed when the profiles were obtained. Pre-blasting and post-blasting exposures revealed a good correlation between the GPR profiles, channel geometry, and characteristics. Interpretation of the GPR profiles provided the position and dimensions of a number of lateral accretions packages which better defined the geometry of the channel. The outcrop characterization and documentation was based on Outcrop Gamma Ray logs and measured stratigraphic sections.

The data were integrated into a depositional model where the lateral migration of high sinuosity channels led to deposition of thick sandstones comprised of lateral accretion packages in an amalgamated to semi-amalgamated fashion, leading to high net sand content and good sandbody connectivity.

AAPG Search and Discovery Article #90142 © 2012 AAPG Annual Convention and Exhibition, April 22-25, 2012, Long Beach, California