Download - Buckles Plot
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"Something hidden.
Go and find it.Go and look behind the Ranges
Something lost behind the Ranges.
Lost and waiting for you. Go!"
Rudyard Kipling - The Explorer
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Using Buckles Plots to Aid Log
Analysis
By Kenneth Chaivre
Wednesday June 25, 2008
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PROBLEMS WITH ROUTINE LOG
ANALYSIS
High Sw wells may produce gas with very little or nowater
Low Sw wells produce water or fail to produce.
Similar looking wells produce differently. Leads to Changing m and n
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Review of R. S. Buckles Paper - 1965
Part of Volumetric Calculation is * (1-SW) * (1-SW) = *SW Buckles showed that * SW irr is a constant
( * SW is the Buckles Number
or Bulk Volume Water)
For Hand Calculations Constant is a quick andeasy way to calculate * (1-SW)
Showed that * SW is related to grain size.
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BUCKLES PLOT
Transition
SWirrTransition
Low Perm
High Perm
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Parameters for Plot
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BVW vs Grain Size and Lithology
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Uses of the Buckles Plot
Identify Swirr Zones for Analysisi.e. Calculate Capillary Pressure
Identify One Type of Low Resistivity Pay Identify Stratigraphic Flow Units
Environments of Deposition
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Calculations with Swirr If Swirr is Known and
If Permeability (k) can be estimated thenCapillary Pressure (Pc) can be estimated
Pc= (19.5*Swirr^-1.7)*(k/100*Phie)^-0.45
Height Above Free Water (H) can becalculated
H= (.35 for gas)*(Pc)
H= (.7 for medium oil) * (Pc)
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Capillary Pressure
Pore Throat Radius (r) can be calculated r = (108.1) / Pc
Winland
r35 Valuesdelineate commercial
hydrocarbon reservoirs
R35= 5.395 * ((K^0.588)/(100*PHIE^0.864))
R35 < 0.5m (microns)Tight
R35 > 0.5m (microns)Will Flow
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BUCKLES IN PRACTICE
DEPTH TO FREE WATER
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Structure Carthage CVS G
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ZONES SELECTED FOR H free water
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MAUDE #13
ZONES FOR DEPTH TO FREE WATER
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RESULTS OF DEPTH TO FREE
WATER
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FREE WATER - CVS G
200 400 FT DOWNDIP
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Low Resistivity Pay Zones
very fined grained rocks have high boundwater
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ASHTON 2 UNIT #10 CVS F
ASHTON 2 UNIT #10 CVS F
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ASHTON 2 UNIT #10 CVS F
BUCKLES
BVW 0.049
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RESULTS - 677mcf & 8.6 bw
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STARR CO - FROST FIELD
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STARR CO-VXBG
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STARR CO - VXBG
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STARR CO VXBG - NOT PERFD
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STARR CO VXBG NOT PERFD
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IDENTIFY FLOW UNITS
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PETER 2 UNIT #10 CVS F
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PETER 2 UNIT #10 CVS F
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COTTON VALLEY FIELD
Webster Parish, Louisiana
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FIRST BANK OF PD - S Sarepta Field
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FIRST BANK OF PD
17 BCF
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CLEMONS UTZ GRAY
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CLEMONS UTZ GRAY
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CLEMONS 1STGRAY
CLEMONS 1ST GRAY
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CLEMONS 1STGRAY
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CLEMONS - UTZ VS 1STGRAY
UTZ 1STGRAY
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CLEMONS 3RD GRAY
Thin Beds
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CARTHAGE FIELD
ENVIRONMENTS OF DEPOSITION
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CARTHAGE - TYPE LOG
Porosity PHI vs. Water Saturation Sw - Cotton Valley Sand Zone C,D,F,G
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5%
6%
7%
8%
9%
10%
11%
30% 35% 40% 45% 50% 55% 60% 65% 70% 75%
Pay Avg Water Saturation Sw, %
PayAvgPorosityPHI,%
PHI vs. Sw -CVC PHI vs. Sw - CVG
PHI vs. Sw - CVF PHI vs. Sw - CVD
From Xindi Wang
CARTHAGE CVS G St t
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CARTHAGE CVS G Structure
CARTHAGE BVW G with Structure
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CARTHAGE BVW G with Structure
Blue
0.02 Red
0.04
Late Cotton Valle Time
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Late Cotton Valley Time
Cotton Valley SandWave reworked
deltaic shoreline.
Fine grained
argillaceoussandstones
CARTHAGE BVW G with Structure
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CARTHAGE BVW G with Structure
Blue
0.02 Red
0.04
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MAUDE #4 LOG
MAUDE #4
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MAUDE #4
CALLOW #9 LOG
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CALLOW #9 LOG
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CALLOW #9
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MAUDE #4 CALLOW #9
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CVS G Qgas vs BVW
BVW
Qgasfrom
Production LogsFewer points
Channel? Inarea of poorer
production.
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RESULTS IN CARTHAGE FIELD
Perfing more and better zones
Better Frac and completion techniques
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Qgas vs Time
Q t Ti
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Qwtr vs Time
TIME VS BW/MCF
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TIME VS BW/MCF
CONCLUSIONS
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CONCLUSIONS
Useful in Establishing Capillary Pressureo Use several equations to find depth to free water
Differentiate Between Zones that Look Alikeon Logs but Produce Differently.
o Help Establish Sw Cutoffso Different Rocks need Different Cutoffs
Suggests Environment of Deposition
Makes You Ask Questions
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REFERENCES Buckles, R. S., 1965, Correlating and Averaging Connate Water Saturation
Data: The Journal of Canadian Petroleum Technology, v. 5, p.42 -252
Aguilera, R., 2002, Incorporating capillary pressure, pore throat aperture radii,height above free-water table and Winland r35 values on Pickett plots: AAPGBulletin V86 No. 4 p. 605-624
Doveton, J. H., 1994, Graphical Techniques for the Analysis and display ofLogging Information: Chapter 2 Vol CA 2: p 23-46 Geologic Log Analysis Using
Computer Methods
Doveton, J. H., 1999, Integrated Petrophysical Methods for the Analysis ofReservoir Microarchitechurea Kansas Chester Sandstone Case Study: AAPG1999 Midcontinent Section, Transactions, Geoscience for the 21stCentury
PfEFFEER Concepts: http://www.kgs.ku.edu/Gemini/Help/Pfeffer-theory
Asquith, G. and Gibson C., 1983, Basic Well Log Analysis for Geologists: p.98
http://www.kgs.ku.edu/Gemini/Help/Pfeffer-theoryhttp://www.kgs.ku.edu/Gemini/Help/Pfeffer-theoryhttp://www.kgs.ku.edu/Gemini/Help/Pfeffer-theoryhttp://www.kgs.ku.edu/Gemini/Help/Pfeffer-theory -
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THANKS
Xindi Wang Christy Demel Pat Noon
Matt Pickrel Randy Nesvold
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QUESTIONS