Update: Rock Model Council Grove Group Panoma Field, Southwest Kansas Kansas Geological Survey...
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Transcript of Update: Rock Model Council Grove Group Panoma Field, Southwest Kansas Kansas Geological Survey...
Update: Rock Model Council Grove Group
Panoma Field, Southwest Kansas
Kansas Geological Survey
Hugoton Project
Martin K. Dubois Alan Byrnes
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
Council Grove Strat Column Formation Member Informal
Ma
pp
ed In
terv
al
top
of
A S
hal
e to
bas
e o
f C
Lim
e
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)
1. Nonmarine Silstones and Sandstones2. Nonmarne Shaley Siltstones3. Marine Carbonates (“clean”, shallow)4. Marine Silica-rich Rocks (deeper)
These four major groups are fairly easily recognized with minimum electric log suites.
NonmarineSilt and Sand vs. Shale and Silt (thickness)
NM Sand (1-3), NM Silt (1-2) NM Shly Silt (1-0>1)
NonmarineSilt and Sand vs. Shale and Silt (% of total nonmarine)
NM Sand (1-3), NM Silt (1-2) NM Shly Silt (1-0>1)
MarineCarbonate vs. Silica-rich (thickness)
Pkst-Grnst (4>5-4>6-_ _1>9), Dol. (6>8), Baff-stone (_7), Mdst-Wkst (5-0>3)
Silty Mdst-Wkst (3>4-0>3), Mar. Shale, Silt, Sand (0,2-1>7)
MarineCarbonate vs. Silica rich (% of total marine)
Pkst-Grnst (4>5-4>6-_ _1>9), Dol. (6>8), Baff-stone (_7), Mdst-Wkst (5-0>3)
Silty Mdst-Wkst (3>4-0>3), Mar. Shale, Silt, Sand (0,2-1>7)
Marine Carbonate Reservoir Lithofacies(Thickness and % of Marine Rocks)
Pkst-Grnst (4>5-4>6-_ _1>9), Dol. (6>8), Bafflestone (_7)
Conclusions
1. On a gross scale, major rock types show predictable distribution patterns throughout the Panoma Field.
2. 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.
3. 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.
4. Better marine carbonates reservoir rocks tend to be concentrated in the in the central and southeast portions of Panoma.
5. Conversely, better nonmarine reservoir rocks tend to be concentrated in the west and northwestern portion of the Panoma field