"Something hidden. Go and find it. Go and look behind the Ranges –

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# "Something hidden. Go and find it. Go and look behind the Ranges – - PowerPoint PPT Presentation

"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. Using Buckles Plots to Aid Log Analysis. By Kenneth Chaivre. Wednesday June 25, 2008.

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## "Something hidden. Go and find it. Go and look behind the Ranges –

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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

### Using Buckles Plots to Aid Log Analysis

By Kenneth Chaivre

Wednesday June 25, 2008

PROBLEMS WITH ROUTINE LOG ANALYSIS
• High Sw wells may produce gas with very little or no water
• Low Sw wells produce water or fail to produce.
• Similar looking wells produce differently.
• Leads to Changing “m” and “n”
Review of R. S. Buckles Paper - 1965
• Part of Volumetric Calculation is Ø * (1-SW)
• Ø * (1-SW) = Ø – Ø*SW
• Buckles showed that Ø * SW irr is a constant
• (Ø * SW is the Buckles Number
• or Bulk Volume Water)
• For Hand Calculations Ø – Constant is a quick and easy way to calculate Ø * (1-SW)
• Showed that Ø * SW is related to grain size.

Fine Grain

SWirr

Transition

High Perm

Coarse Grain

Low Perm

BUCKLES PLOT

Transition

Uses of the Buckles Plot
• Identify Swirr Zones for Analysis
• i.e. Calculate Capillary Pressure
• Identify One Type of Low Resistivity Pay
• Identify Stratigraphic Flow Units
• Environments of Deposition
Calculations with Swirr
• If Swirr is Known and
• If Permeability (k) can be estimated then
• Capillary Pressure (Pc) can be estimated
• Pc= (19.5*Swirr^-1.7)*(k/100*Phie)^-0.45
• Height Above Free Water (H) can be calculated
• H= (.35 for gas)*(Pc)
• H= (.7 for medium oil) * (Pc)
Capillary Pressure
• Pore Throat Radius (r) can be calculated
• r = (108.1) / Pc
• Winland r35 Values– delineate commercial hydrocarbon reservoirs
• R35 = 5.395 * ((K^0.588)/(100*PHIE^0.864))
• R35 < 0.5μm (microns) – Tight
• R35 > 0.5μm (microns) – Will Flow
CARTHAGE BVW G with Structure

Blue – 0.02 Red – 0.04

Cotton Valley Sand

Wave reworked deltaic shoreline.

Fine grained argillaceous sandstones

Late Cotton Valley Time

CARTHAGE BVW G with Structure

Blue – 0.02 Red – 0.04

CVS G Qgas vs BVW

Qgas – from Production Logs

Fewer points

BVW

Channel? In area of poorer production.

RESULTS IN CARTHAGE FIELD
• Perf’ing more and better zones
• Better Frac and completion techniques
CONCLUSIONS
• Useful in Establishing Capillary Pressure
• Use several equations to find depth to free water
• Differentiate Between Zones that Look Alike on Logs but Produce Differently.
• Help Establish Sw Cutoffs
• Different Rocks need Different Cutoffs
• Suggests Environment of Deposition