buckles plot

5/22/2018 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



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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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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



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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

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