Update: Rock Model Council Grove Group Panoma Field, Southwest Kansas

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Update Rock Model Council Grove GroupPanoma
Field, Southwest Kansas
Martin K. Dubois Alan Byrnes
Kansas Geological Survey Hugoton Project
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Core Descriptions Core Analysis

6 4 39
10 35 14
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Core Analysis Data Set
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Core Data Sources
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Wells with LAS Files by Consortium Members
3900 Gross 3200 Net Wells
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Idealized Depositional Model
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Major Lithofacies
Nonmarine Shaly Siltstone Nonmarine
Siltstone Dolomite Med Coarse Grained
Pkst-Grnst V. Fine Fine Grained Pkst-Grnst
Phylloid Algal Bafflestone Mudstone
Wackestone Silty Mudstone-Wkst Marine
Siltstone Marine Shale
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Lithofacies Distribution in Six Council Grove
Cores
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Council Grove Strat Column
Formation Member
Informal
Mapped Interval top of A Shale to base of C Lime
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Council Grove GroupStructure and Isopach Maps
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Marine vs. Nonmarine (thickness)
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Marine vs. Nonmarine ( total)
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Mapped Intervals
Gross thickness from the top of Council Grove (A
Shale) to the top of the Roca Shale (D Shale,
base of Grenola, base of C Limestone)

• Nonmarine Silstones and Sandstones
• Nonmarne Shaley Siltstones
• Marine Carbonates (clean, shallow)
• Marine Silica-rich Rocks (deeper)

These four major groups are fairly easily
recognized with minimum electric log suites.
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NonmarineSilt and Sand vs. Shale and Silt
(thickness)
NM Sand (1-3), NM Silt (1-2)
NM Shly Silt (1-0gt1)
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NonmarineSilt and Sand vs. Shale and Silt ( of
total nonmarine)
NM Sand (1-3), NM Silt (1-2)
NM Shly Silt (1-0gt1)
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Nonmarine Siltstones
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MarineCarbonate vs. Silica-rich (thickness)
Pkst-Grnst (4gt5-4gt6-_ _1gt9), Dol. (6gt8),
Baff-stone (_7), Mdst-Wkst (5-0gt3)
Silty Mdst-Wkst (3gt4-0gt3), Mar. Shale, Silt,
Sand (0,2-1gt7)
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MarineCarbonate vs. Silica rich ( of total
marine)
Pkst-Grnst (4gt5-4gt6-_ _1gt9), Dol. (6gt8),
Baff-stone (_7), Mdst-Wkst (5-0gt3)
Silty Mdst-Wkst (3gt4-0gt3), Mar. Shale, Silt,
Sand (0,2-1gt7)
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Med-Coarse Grained Packstone-Grainstone
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Phylloid Algal Bafflestone
cm
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Marine Carbonate Reservoir Lithofacies(Thickness
and of Marine Rocks)
Pkst-Grnst (4gt5-4gt6-_ _1gt9), Dol. (6gt8),
Bafflestone (_7)
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Conclusions

• On a gross scale, major rock types show
  predictable distribution patterns throughout the
  Panoma Field.
• Thinning in the marine rocks to the northwest is
  compensated by thickening in the nonmarine
  intervals. Overall thickness of the Council
  Grove is relatively consistent throughout Panoma.
• The influx of quartz silt, very fine sand and
  clay from the west and northwest is quite
  dramatic, on a regional scale, and is evident in
  both the nonmarine and marine intervals.
• Better marine carbonates reservoir rocks tend to
  be concentrated in the in the central and
  southeast portions of Panoma.
• Conversely, better nonmarine reservoir rocks tend
  to be concentrated in the west and northwestern
  portion of the Panoma field