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Petra Petrophysical Characterization and Volumetrics


The Park City and Phosphoria formations are comprised of the type II marine source rock for the Phosphoria-Weber petroleum system. After generation, hydrocarbons migrated directly from the Phosphoria to the Pennsylvanian-Permian Weber Sandstone reservoir. However, with no source in the Rangely it required long-distance migration in the Weber Sandstone carrier bed to the eventual trap area. .
             A) B) .
             Figure 1A. Map showing the location of the Rangely Field. 1B is a close up of the Rangely anticline. From Kirschbaum, 2003. .
             The initial trap was created by a stratigraphic facies boundary between the interfingering fluvial Maroon Formation and the eolian Weber Sandstone. This initial accumulation then re-migrated through Laramide thrusting and east-west closure established by intersection within the Douglas Creek Arch. A structure contour map of the top of the Weber Sandstone reservoir from well log formation tops in the Rangely Field. It shows the location of the Chevron UP139Y-28 well and the location of the original oil/water contact and the 1985 oil/water contact (Figure 2).
             Figure 2. Structure contour map of Rangely with outlines of the original (yellow dashed lines) and 1985 (red dashed lines) oil/water contacts. Location of the UP139Y-28 is marked by the green circle with cross hairs. Township and range are also labeled. Contours are 50' intervals. Petra. .
             Methods.
             Data for UP139Y-28 includes gamma ray (GRBH), caliper (CABH), bulk density (RBFC), sonic (DTBH), neutron (SSCN), and a deep resistivity log (RDDI). The original oil/water contact was also provided. Equations from Asquith (1982), were used to produce logs that are corrected for the presence of shale. The water saturation curve (SW) concluded that the 1985 oil/water contact had indeed moved upwards. Equations will be drawn out and explained. .
             To calculate for shale correction, the volume of shale must be determined using the following equation (Asquith, 1982):.


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