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Pennsylvania State University, University Park, PA

Abstract: Petrophysical Analysis of the Second Bench of the Second Frontier Formation, T23N-R112W, WY

The Second Frontier Formation in western Wyoming is a sequence of early Late Cretaceous marine and nonmarine sands with interbedded shaley-sands and shales. These sediments are derived from rocks in the Wyoming-Utah Thrust Belt which were uplifted, eroded, and eventually deposited to the east in the early Late Cretaceous Interior Seaway. Depositional environments for these sediments have been identified to include fluvial, estuarine, and marine.

Infill development of the Second Frontier Formation in the Emigrant Springs/Farson Road area along the Moxa Arch has been characterized as statistical due to the combination of tectonism along the Arch and depositional environments which vary both laterally and vertically in the study area. Because of these geologic complexities, a petrophysical analysis of this area is being performed to identify depositional environments. This is being accomplished using traditional open hole logs and the correlation of their response to drill cuttings, sidewall cores, and advanced openhole logs such as Combined Magnetic Resonance (CMR) and Formation Multi Imaging (FMI). Once these depositional environments are defined, parameters such as effective porosity, water saturation and permeability will be estimated for each environment present using empirical relationships. Correlations will then be developed between log measured and log estimated parameters, to initial production (IP) and estimated ultimate recovery (EUR).

Analysis of these relationships should demonstrate that certain parameters are indicators of initial production and ultimate recovery. Moreover, this analysis should demonstrate the applicability of this methodology to complex reservoirs to provide improved production estimates.

AAPG Search and Discovery Article #90919©1999 AAPG Rocky Mountain Section Meeting, Bozeman, Montana