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Kansas Geological Survey, Open File Report 96-50

Seismic Modeling in the Minneola Complex, part 4 of 10

Single-Well Model Interpretation

The single well model uses the Statton #1-12 well and various modified versions of this well to build a pseudo-cross section which shows a relatively thin Morrow-Mississippian channel-fill interval (21 ft. 6.4 m.) that contains a moderately thick sand (9 ft.; 2.7 m) in the middle of the channel, flanked by a shale section that thins to a 2 ft. (0.6 m.) Morrow-Mississippian interval outside of the channel (Fig. 4a). Correlated tops include the Marmaton (MRMT), Cherokee (CHRK), Atoka (ATOK), Morrow (MRRW), and Mississippian (MISS). The model extends above the Marmaton but is not shown to focus on the area of interest. The Morrow sandstone interval is represented in the unmodified version of the well. The shale filled part of the channel was created by connecting the log curve above and below the sandstone interval with a straight line. Note that in this well the sandstone has a higher velocity than the shale, even though the sandstone is porous and filled with gas. This is typical of the high-impedance productive sandstones found in the Minneola complex and suggests an isochron anomaly should be detected between a channel filled with just shale and one that contains a sandstone. The channel edges were created by replacing all but the top 2 ft. (0.6 m.) of the original Morrow-Mississippian interval with the Mississippian limestone velocity and bulk density.

Figure 4a--Single well model cross section. Sonic curves are red and bulk density curves are blue. Vertical scale in feet below sea level. Horizon (tops) abbreviations are Marmaton (MRMT), Cherokee (CHRK), Atoka (ATOK), Morrow (MRRW) and Mississippian (MISS).

cross section showing log curves

Figure 4b--Interpolated single well acoustic impedance model. Reds represent limestones, sandstones, and higher velocity shales. Yellows and oranges represent lower velocity shales. Vertical scale in seconds of two-way travel time from the top of the model and is approximately twice that of the seismic models. A black and white verion of this plot is available.

colored seismic plot

Figure 4c--Same as Figure 4b but with a vertical scale approximately the same as the seismic models. A black and white verion of this plot is available.

colored seismic plot, different scale

The log interpolation model of this cross section is shown as a vertically expanded version in Figure 4b and at the same scale as the synthetic seismic section in Figure 4c. Note that the curves and colors in the log interpolation model represent acoustic impedance values which are the product bulk density and velocity. Also note that the vertical scale is in two-way travel time from the top of the model. The darker reds represent higher impedance values (mostly from limestone, sandstone, and high velocity/density shales. The oranges and yellow represent low velocity and density shales. Although the thickness interval is the same for both the shale and sandstone filled channel wells, there is an isochron thickening in the shale filled channel wells compared to that containing the sandstone due to the lower velocity of the shale.

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Kansas Geological Survey, Open-File Report 96-50
Placed online Feb. 1997
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