Enhanced Co

Enhanced C/O RSTPro Interpretation School 1999

SchlumbergerIntroduction of Advanced Carbon-Oxygen Logging

Key Features of RSTPro• New Spectral Standards

• Full Spectrum Calibrations

• Expanded Database

• Smoother Database Interpolation/Extrapolation

• High Precision Mode for Field Monitoring

• Detector Resolution Compensation for Windows Measurements

• New GeoFrame Based Processing (No more INCRES)


SchlumbergerEnhanced C/O Spectral StandardsEnhanced C/O Spectral Standards

0 1 2 3 4 5 6 7 8

Cou

nts

(Arb

itrar

y of

fset

s)

Energy (MeV)

O

Tool

Si

Ca

Mg

S

C

Fe

RSTA Far InelasticStandard Spectra

•Two Additional Inelastic Standards Mg & S•More Accurate Tool Background•Improved Technique for Removing Capture Background•Reduced Positive Biases in Low Porosity.


SchlumbergerFan Chart Interpretation

0 20 40 600

0.2

0.4

0.6

0.8

1

Porosity (p.u.)

FC

OR

Lime, 6−in. BH, 4.5−in. / 10.5 lbm/ft Csg

Water in BH

Oil in BH

Database

0 20 40 600

0.2

0.4

0.6

0.8

1

Porosity (p.u.)

FC

OR

Lime, 6−in. BH, 4.5−in. / 10.5 lbm/ft Csg

Water in BH

Oil in BH

Database

C/O Fan Chart for Former Standards C/O Fan Chart for New Standards


SchlumbergerC/O Response for Old and New Standards

10 15 20 25 30 35 40−0.05

0

0.05

0.1

0.15

0.2C/O Responses: Old & New Standards

Porosity (p.u.)

C/O

Rat

io (f

rom

spe

ctra

l yie

lds)

Drained Oil−Sands

Dry−Sand (Old)

Dry−Sand (New)

Water−Sands

Oil−Sands

New

Old

New

Old

Old

New

Water−Sands (Old Stds)Oil−Sands (Old Stds)Drained Oil−Sands (Old Stds)Dry−Sand (Old Stds)Water−Sands (New Stds)Oil−Sands (New Stds)Drained Oil−Sands (New Stds)Dry−Sand (New Stds)


SchlumbergerFull Spectrum Calibration Function

60 80 100 120 140 160 180 200 2200.9

0.95

1

1.05

1.1

1.15Sample RST Spectral Calibration Function

Energy (channel number)

Spec

tral C

alib

ratio

n Fu

nctio

n

Formation 1Formation 2Formation 3Formation 4Formation 5Formation 6Formation 7Formation 8Water−Tank


SchlumbergerDatabase Measurements1 .6 8 7 5 -in . C h a r a c te r iz a tio n s 1

Hol

e Si

ze(in

.)

Casi

ng S

ize2

(in.)

Cas

ing

Wei

ght

(lbm

/ft)

Lim

esto

ne F

orm

atio

nPo

rosi

ties3

Sand

ston

e Fo

rmat

ion

Poro

sitie

s3

Form

atio

nFl

uid4

Bore

hole

Flui

d4

4 .1 2 5 O H n /a Z M H Z M H W O W O2 .8 7 5 6 .4 Z M H Z M H W O W O

3 .5 1 2 .7 Z M H Z M H W O W O6 O H n /a Z M H Z M H W O W O

2 .8 7 5 8 .6 Z M H Z M H W O W O4 .5 1 0 .5 Z M H Z M H W O W O5 1 1 .5 Z M H Z M H W O W O5 1 8 Z M H Z M H W O W O

8 O H n /a Z n /a W O5 .5 2 3 Z n /a W O6 1 8 Z n /a W O7 3 2 Z n /a W O

8 .5 O H n /a Z M H M H W O W O5 2 3 .2 M H W O W O

6 .6 2 5 2 0 Z M H M H W O W O7 2 3 Z M H M H W O W O7 3 2 Z M H M H W O W O

1 0 O H n /a Z M H Z W O W O7 2 3 Z M H Z M H W O W O7 3 2 Z M H Z M H W O W O

7 .6 2 5 2 6 .4 Z M H Z M H W O W O7 .6 2 5 3 3 .7 Z M H W O W O

1 2 8 .6 2 5 3 6 Z M H M H W O W O9 .6 2 5 3 2 .3 Z M H M H W O W O9 .6 2 5 5 3 .5 Z M H M H W O W O

1 S h a d in g in d ic a te s n e w d a ta b a s e m e a s u re m e n t.2 O H = O p e n H o le3 Z = Z e ro (0 p .u .),

M = M e d iu m (1 5 to 2 0 p .u .),H = H ig h (~ 3 3 p .u . fo r s a n d , 3 8 to 4 3 p .u . fo r lim e )

4 W = F re s h W a te rO = # 2 D ie s e l F u e l T a b le 2

2 .5 - in . C h a r a c t e r i z a t io n s 1

Hol

e Si

ze(in

.)

Casi

ng S

ize2

(in.)

Cas

ing

Wei

ght

(lbm

/ft)

Lim

esto

ne F

orm

atio

nPo

rosi

ties3

Sand

ston

e Fo

rmat

ion

Poro

sitie

s3

Form

atio

nFl

uid4

Bor

ehol

eFl

uid4

4 .1 2 5 O H n /a Z M H M H W O W O3 .5 1 2 .7 Z M H M H W O W O

6 O H - Z M H M H W O W O4 .5 1 0 .5 Z M H M H W O W O

5 1 1 .5 Z M H M H W O W O5 1 8 Z M H M H W O W O

8 .5 O H n /a Z M H M H W O W O5 1 8 M H W O W O5 2 3 .2 M H W O W O

6 .6 2 5 2 0 Z M H M H W O W O7 2 3 Z M H M H W O W O7 3 2 Z M H M H W O W O

1 0 O H n /a Z M H M H W O W O7 2 3 Z M H M H W O W O7 3 2 Z M H M H W O W O

7 .6 2 5 2 6 .4 Z M H M H W O W O7 .6 2 5 3 3 .7 M H W O W O

1 2 O H n /a M H W O W O8 .6 2 5 3 6 Z M H M H W O W O9 .6 2 5 3 2 .3 Z M H M H W O W O9 .6 2 5 4 3 .5 M H M H W O W O9 .6 2 5 5 3 .5 Z M H M H W O W O

1 0 3 3 M H W O W O1 S h a d in g in d ic a te s n e w d a ta b a s e m e a s u re m e n t .2 O H = O p e n H o le3 Z = Z e ro (0 p .u . ) ,

M = M e d iu m (1 5 to 2 0 p .u . ) ,H = H ig h (~ 3 3 p .u . f o r s a n d , 3 8 to 4 3 p .u . fo r l im e )

4 W = F re s h W a te rO = # 2 D ie s e l F u e l


SchlumbergerTool Accuracy

C/O MethodTool“A”(s.u.)

Tool“B”(s.u.)

Tool“C”(s.u.)

Tool“D”(s.u.)

Tool“E”(s.u.)

Tool“F”

(s.u.)

Tool“G”(s.u.)

Avg AbsError vs

ENP1 (s.u.)

Reductionin Error vs

ENP1

Far Yields (RST) 12.3 9.0 15.2 21.5 8.6 -9.1 -3.4 10.00Far Yields (RSTPro) -1.3 -2.7 -2.0 1.9 1.2 -1.9 -1.1 1.46 85.4 %Far Windows (RST) 14.4 7.9 10.2 20.8 12.5 -5.9 5.3 10.16Far Windows (RSTPro) 2.3 -1.3 -0.6 4.7 1.9 -1.1 0.6 1.63 83.7 %Near Yields (RST) 4.2 -5.6 6.6 16.0 6.2 12.3 13.5 7.44Near Yields (RSTPro) -0.9 -7.5 1.5 7.1 5.4 -1.3 8.8 4.46 55.4 %Near Windows (RST) - 18.5 8.2 19.1 -2.4 -7.8 -5.1 9.06Near Windows(RSTPro) -3.1 3.5 -4.1 -0.8 -3.3 -6.5 -3.8 2.66 73.4 %


SchlumbergerGas Response

C/O Bias in Gas Zones With and Without Gas Correction Logic


SchlumbergerImprovement in Accuracy and Precision

Improved Precision ofIdentical Passes usingLogos (RST) Processingand Enhanced C/O (RSTPro)


Schlumberger

Tool 34 Calibrations

0.90

0.95

1.00

1.05

1.10

1 11 21 31 41 51 61 71 81 91 101

111

121

131

141

151

161

171

181

191

201

211

221

231

241

251

Channel

Gai

n

1996 Inelastic1996 Capture1997 Inelastic1997 Capture1998 Inelastic1998 CaptureSeries7Water Tank

Calibration Stability


Schlumberger5 Pass Tool Precision with Standard Processing

5 Repeat Passes Logged at100 ft/hr.

9 7/8” Bit Size7” 29# Casing


SchlumbergerCore Vs Core Repeatability


Schlumberger5 Pass Repeatability with Recycled Alpha

5 Passes Using the Same Toolwith Recycled Alpha.


Schlumberger5 Passes 5 Tools

Repeatability Test Using5 Different Tools.


Schlumberger4 Passes 4 Tools

Repeatability Test Using4 Different Tools withStandard Processing.


Schlumberger4 Tools Calibrated Results

4 Tools Processed UsingEnhanced C/O techniques


SchlumbergerReservoir Monitoring

Oil Saturation Over

5 Years Vs Original

Core Oil Saturation


SchlumbergerC/O Derived Oil Saturation in the Kern River Field


SchlumbergerConclusion

RSTPro is a new generation C/O logging tool capable ofmaking accurate and precise measurements in a wide varietyof environments

The number of database points for the RSTPro tool is nearly double the number of points available for the RST

RSTPro makes use of the first full spectrum calibration forany tool in the industry resulting in an 85% improvement inaccuracy over the RST

Accuracy comparable to Coring…….

Enhanced Co

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