MISSISSIPPIAN MISSION CANYON FORMATION, WILLISTON BASIN, U.S.A (75 pts). A wildc

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MISSISSIPPIAN MISSION CANYON FORMATION, WILLISTON BASIN, U.S.A (75 pts). A wildcat well in the Williston Basin is drilled to the Mississippian Mission Canyon Formation at approximately 9,297 to 9,409 ft which was decided from the cuttings and LWID measurements. Cores were taken and based petrophysical analysis, two potential zones containing hydrocarbon shows were identified, the upper and lower Mission Canyon. From the core data, it was decided to stop drilling and run wireline logs to assess the potential of the Mission Canyon for production of oil and gas. Your company agrees with your suggestion to run a complete log package, which are shown below, including GR, Caliper, resistivity logs, 1- sonic and neutron-density measured in LST settings. Complete the following tasks.- Show your calculations, and elaborate on your answers for each Complete the following tasks- Show your calculations, and elaborate on your answers for section: Fill out the resistivity table. a. b. Determine the lithology from mineral identification "MID" plot and M-N lithology plot. which propose that the rock may be composed of more than two significant minerals c The Pickett plot is created from the log information (page 5), find and m from the plot if a I and n-2 . [F a/(pND)"] and PND is the average value of ND porosity from the logs. d. Calculate water saturation, bulk volume water (BVW), the moveable hydrocarbon index (MHI) which is equivalent to HSI (HC saturation Index), moveable oil/hydrocarbon saturation (MOS/MHS), and residual oil/hydrocarbon saturation (ROS/RHS). Decide lithology and grain size based on these values. Which depth is the suitable reservoir! Additional information can be found in the log header in page 3. 11Page

Explanation / Answer

Mission Canyon limestone of Madison group. At type section [locality] in Little Rocky Mountains, Blaine County, Montana [in Williston basin], consists of approximately 330 feet of massive, predominantly white to cream limestone with a coarsely crystalline to fragmental texture. Exposures represent a partial section of the lithologic unit; estimated that pre-Middle Jurassic erosion has removed at least 150 feet of the formation at the type [locality]. In the subsurface, immediately south of the Little Rockies, the formation is complete. A map illustrates the regional distribution and thickness in the northwestern part of Williston basin, Montana, northern part of Sweetgrass arch, Montana, and adjacent parts of Canada. Correlations from electrical and radioactivity curves, and generalized lithology, are presented. Thickness pattern is modified by pre-Middle Jurassic erosion throughout an extensive area in north-central Montana. Within that area, Jurassic sediments disconformably overlie the formation. Outside of the "eroded area," it is in apparent conformable and partly transitional contact with the overlying Charles formation. Underlain conformably by Lodgepole limestone

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