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SITE 1039

508

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SHORE-BASED LOG PROCESSING

HOLE 1039D

naledod

hole,eholen of

calure-cu- out-ludedels.

er- ac-ityandndi-a-

ator

x-her

Bottom felt: 4362.5 mbrf (used for depth shift to seafloor)Total penetration: 406.5 mbsf

Logging Tools

The logs were recorded using the logging-while-drilling (LWD)technique, which allows scientists to obtain open-hole logs duringdrilling operations. The advantages of this technique are many: real-time analysis can accelerate drilling speed, avoid stuck pipe, and re-duce borehole problems. LWD can also collect data open-hole in theuppermost part of the hole; this cannot be accomplished with wirelinetools as the drill string is usually kept in the upper part of the boreholewhere hole conditions are generally bad.

The LWD employs the following tool combinations:

CDR = compensated dual resistivity (resistivity-gamma ray)CDN = compensated density neutron (density-porosity-caliper)

Processing

Depth shift: Original logs have been depth shifted to the seafloor(−4362.5 m).

Gamma-ray data processing: Processing of the data is per-formed in real-time onboard by Schlumberger personnel. Gamma-ray data is measured as natural gamma ray (GR) and spectral gammaray (NGT); during Leg 170 only the former has been corrected forhole size (bit size), collar size, and type of drilling fluid. Because ofa bug in the acquisition software, the NGT total and computed gam-ma ray (SGR and CGR) could not be environmentally corrected andconverted into API units. For this reason, they are not included in thedatabase.

Neutron porosity data processing: The neutron porosity mea-surements have been corrected for standoff, temperature, mud salin-ity, and mud hydrogen index (mud pressure, temperature, andweight).

Table of CTable of C

Density data processing: Density data have been processed tocorrect for the irregular borehole using a technique called “rotatioprocessing,” which is particularly useful in deviated or enlargboreholes with irregular or elliptical shape. This statistical methmeasures the density variation while the tool rotates in the boreestimates the standoff (distance between the tool and the borwall), and corrects the density reading (a more detailed descriptiothis technique is available upon request).

Resistivity data processing: A deconvolution technique called“qualitative resistivity overlay” aimed at providing enhanced vertiresolutions is used for both shallow and deep resistivity measments to compute output with 1-2-3-4-5 ft vertical resolution (domentation on this technique is also available upon request). Theputs are sampled at a 0.0762-m (3 in) sampling rate and are incin the database along with the standard 0.1524-m (0.5 ft) chann

Quality Control

During the processing, quality control of the data is mainly pformed by cross-correlation of all logging data. The best data arequired in a circular borehole; this is particularly true for the denstool, which uses clamp-on stabilizers to eliminate mud standoff to ensure proper contact with the borehole wall. A data quality icator is given by the differential caliper (DCAL) channel, which mesures the tool standoff during the recording. Another quality indicis represented by the density correction (DRHO).

Additional information about LWD logs can be found in the “Eplanatory Notes” and “Site 1039” chapters, this volume. For furtquestions about the logs, please contact:

Cristina BrogliaPhone: 914-365-8343Fax: 914-365-3182E-mail: [email protected]

Next ChapterNext Chapterontentsontents

SITE 1039

Hole 1039D: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data

Dep

th (

mbs

f)

0

50

100

150

0 100API unitsGamma Ray

0.3 1.8Ohm-mDeep Resistivity

0.3 1.8Ohm-mShallow Resistivity

0 200f/hrPenetration Rate

0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

509

SITE 1039

510

Hole 1039D: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data (cont.)

Dep

th (

mbs

f)

200

250

300





200

250

300

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1039


Dep

th (

mbs

f)

350

400





350

400

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

511

450

500

450

500

SITE 1039

512

Hole 1039D: LWD Natural Gamma Ray-Density-Porosity Logging Data

Dep

th (

mbs

f)

0

50

100

150


-1 9in.Differential Caliper

1 2g/cm3Maximum Density

100 0%Neutron Porosity

-0.25 0.25g/cm3Density Correction

0 10barns/e-Photoelectric Factor

0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1039

Hole 1039D: LWD Natural Gamma Ray-Density-Porosity Logging Data (cont.)

Dep

th (

mbs

f)

200

250

300







200

250

300

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

513

SITE 1039

514


Dep

th (

mbs

f)

350

400







350

400

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

450

500

450

500

SITE 1040


HOLE 1040C

wse

7

nf

to

r-

inlong-ed toring

out

sednal.DT

founda-

Bottom felt: 4189 mbrfTotal penetration: 665 mbsfTotal core recovered: 377.3 m (74.6 %)

Logging Runs

Logging string 1: DIT/SDT/HLDT/GPIT/NGTWireline heave compensator was used to counter ship heave. The

hole was deviated from the vertical; maximum deviation observedwhile logging was 11°.

Bottom-hole Assembly

The following bottom-hole assembly depths are as they appeathe logs after differential depth shift (see “Depth shift” section) adepth shift to the seafloor. As such, there might be a discrepancythe original depths given by the drillers onboard. Possible reasondepth discrepancies are ship heave, use of wireline heave comptor, and drill string and/or wireline stretch.

DIT/SDT/HLDT/GPIT/NGT: Bottom-hole assembly at ~8mbsf.

Processing

Depth shift: No differential depth shift was necessary as only ologging pass was recorded. The amount of depth shift to the sea

r onnd

ith fornsa-

eloor

(−4184m) differs 5 m from the drillers’ water depth; it correspondsthe depth of the seafloor as it is seen on the logs.

Gamma-ray processing: NGT data have been processed to corect for borehole size and type of drilling fluid.

Acoustic data processing: The array sonic tool was operated standard depth-derived borehole compensated mode, including spacing (8-10-10-12 ft) logs. The sonic logs have been processeliminate some of the noise and cycle skipping experienced duthe recording.

Quality Control

Invalid spikes were frequently recorded (PEF curve) throughthe hole.

Data recorded through bottom-hole assembly should be uqualitatively only because of the attenuation on the incoming sig

Hole diameter was recorded by the hydraulic caliper on the HLtool (CALI).

Details of standard shore-based processing procedures are in the “Explanatory Notes” chapter, this volume. For further informtion about the logs, please contact:


515

SITE 1040

516

Cor

e

Rec

over

yno

cor

ing

bottom hole assembly

open hole

Hole 1040C: Natural Gamma Ray-Resistivity-Sonic Logging Data

Dep

th (

mbs

f)

1R

0

50

100

150

0 75API unitsTotal Gamma Ray

0 75API unitsComputed Gamma Ray

0.1 10Ohm-mFocused Resistivity

0.1 10Ohm-mDeep Resistivity

0.1 10Ohm-mMedium Resistivity

1.3 2.3km/sMean Velocity

1.3 2.3km/sMedian Velocity

0

50

100

150

10 20in.Caliper

Dep

th (m

bsf)

SITE 1040

Cor

e

Rec

over

y

Hole 1040C: Natural Gamma Ray-Resistivity-Sonic Logging Data (cont.)

Dep

th (

mbs

f)

2R

3R

4R

5R

6R

7R

8R

200



0.1 10Ohm-mFocused Resistivity

0.1 10Ohm-mDeep Resistivity

0.1 10Ohm-mMedium Resistivity

1.3 2.3km/sMean Velocity

1.3 2.3km/sMedian Velocity

200

10 20in.Caliper

Dep

th (m

bsf)

517

9R

10R

11R

12R

13R

14R

15R

16R

17R

18R

19R

250

300

250

300

SITE 1040

518

Hole 1040C: Natural Gamma Ray-Density-Porosity Logging Data

Dep

th (

mbs

f)

1R

0

50

100

150



20 10in.Caliper

1 3g/cm3Bulk Density



0

50

100

150

5 0ppmUranium

-2 8ppmThorium

0 5wt.%Potassium

Dep

th (m

bsf)

Cor

e

Rec

over

yno

cor

ing

bottom hole assembly

open hole

invalid data invalid data

invalid data

invalid data

invalid data

invalid data

SITE 1040

Hole 1040C: Natural Gamma Ray-Density-Porosity Logging Data (cont.)

Dep

th (

mbs

f)

2R

3R

4R

5R

6R

7R

8R

200



20 10in.Caliper

1 3g/cm3Bulk Density



200

5 0ppmUranium

-2 8ppmThorium

0 5wt.%Potassium

Dep

th (m

bsf)

Cor

e

Rec

over

y

519

9R

10R

11R

12R

13R

14R

15R

16R

17R

18R

19R

250

300

250

300

SITE 1040

520


HOLE 1040D

r-ma f a a

-sa

tonaledodole,

eholen of

alure-cu- out-udedels.

er- ac-ityanddi-a-tor

x-fur-

Bottom felt: 4189 mbrf (used for depth shift to seafloor)Total penetration: 337 mbsf

Logging Tools



CDR = compensated dual resistivity (resistivity-gamma ray)CDN = compensated density-neutron (density-porosity-caliper)

Processing

Depth shift: Original logs have been depth shifted to the seafloor(– 4189 m).

Gamma-ray data processing: Processing of the data is peformed in real-time onboard by Schlumberger personnel. Gamray data is measured as natural gamma ray (GR) and spectral gray (NGT); during Leg 170 only the former has been correctedhole size (bit size), collar size, and type of drilling fluid. Becausea bug in the acquisition software, the NGT total and computed gma ray (SGR and CGR) could not be environmentally correctedconverted into API units. For this reason, they are not included indatabase.

Neutron porosity data processing: The neutron porosity measurements have been corrected for standoff, temperature, mud ity, and mud hydrogen index (mud pressure, temperature, weight).

a-mmaorofm-nd

the

alin-nd

Density data processing: Density data have been processedcorrect for the irregular borehole using a technique called “rotatioprocessing,” which is particularly useful in deviated or enlargboreholes with irregular or elliptical shape. This statistical methmeasures the density variation while the tool rotates in the borehestimates the standoff (distance between the tool and the borwall), and corrects the density reading (a more detailed descriptiothis technique is available upon request).

Resistivity data processing: A deconvolution technique called“qualitative resistivity overlay” aimed at providing enhanced verticresolutions is used for both shallow and deep resistivity measments to compute output with 1-2-3-4-5 ft vertical resolution (domentation on this technique is also available upon request). Theputs are sampled at a 0.0762-m (3 in) sampling rate and are inclin the database along with the standard 0.1524-m (0.5 ft) chann

Quality Control

During the processing, quality control of the data is mainly pformed by cross-correlation of all logging data. The best data arequired in a circular borehole; this is particularly true for the denstool, which uses clamp-on stabilizers to eliminate mud standoff to ensure proper contact with the borehole wall. A data quality incator is given by the differential caliper (DCAL) channel, which mesures the tool standoff during the recording. Another quality indicais represented by the density correction (DRHO).

Additional information about LWD logs can be found in the “Eplanatory Notes” and the “Site 1040” chapters, this volume. For ther questions about the logs, please contact:

Cristina Broglia Phone: 914-365-8343 Fax: 914-365-3182 E-mail: [email protected]

SITE 1040

Hole 1040D: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data

Dep

th (

mbs

f)

0

50

100

150




0 200m/hrPenetration Rate

0

50

100

150

-12 8ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

521

SITE 1040

522


Dep

th (

mbs

f)

200

250

300





200

250

300

-12 8ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1040

Hole 1040D: LWD Natural Gamma Ray-Density-Porosity Logging Data

Dep

th (

mbs

f)

0

50

100

150



1 2.5g/cm3Maximum Density




0

50

100

150

-12 8ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

523

SITE 1040

524


Dep

th (

mbs

f)

200

250

300



1 2.5g/cm3Maximum Density




200

250

300

-12 8ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1040


HOLE 1040E

naledod

hole,eholen of

calure-cu- out-ludedels.

er- ac-ityandndi-a-

ator

x-fur-


Logging Tools




Processing

Depth shift: Original logs have been depth shifted to the seafloor(−4189 m).



Density data processing: Density data have been processed tocorrect for the irregular borehole using a technique called “rotatioprocessing,” which is particularly useful in deviated or enlargboreholes with irregular or elliptical shape. This statistical methmeasures the density variation while the tool rotates in the boreestimates the standoff (distance between the tool and the borwall), and corrects the density reading (a more detailed descriptiothis technique is available upon request).

Resistivity data processing: A deconvolution technique called“qualitative resistivity overlay” aimed at providing enhanced vertiresolutions is used for both shallow and deep resistivity measments to compute output with 1-2-3-4-5 ft vertical resolution (domentation on this technique is also available upon request). Theputs are sampled at a 0.0762-m (3 in) sampling rate and are incin the database along with the standard 0.1524-m (0.5 ft) chann

Quality Control

During the processing, quality control of the data is mainly pformed by cross-correlation of all logging data. The best data arequired in a circular borehole; this is particularly true for the denstool, which uses clamp-on stabilizers to eliminate mud standoff to ensure proper contact with the borehole wall. A data quality icator is given by the differential caliper (DCAL) channel, which mesures the tool standoff during the recording. Another quality indicis represented by the density correction (DRHO).

Additional information about LWD logs can be found in the “Eplanatory Notes” and the “Site 1040” chapters, this volume. For ther questions about the logs, please contact:

Cristina Broglia Phone: 914-365-8343Fax: 914-365-3182 E-mail: [email protected]

525

SITE 1040

526

Hole 1040E: LWD Natural Gamma Ray-Resistivity-Sonic Logging Data

Dep

th (

mbs

f)

0

50

100

150


0 8Ohm-mDeep Resistivity

0 8Ohm-mShallow Resistivity


0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1040

Hole 1040E: LWD Natural Gamma Ray-Resistivity-Sonic Logging Data (cont.)

Dep

th (

mbs

f)

200

250

300


0 8Ohm-mDeep Resistivity

0 8Ohm-mShallow Resistivity


200

250

300

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

527

SITE 1040

528

Hole 1040E: LWD Natural Gamma Ray-Density-Porosity Logging Data

Dep

th (

mbs

f)

0

50

100

150



1.1 2.1g/cm3Maximum Density




0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1040

Hole 1040E: LWD Natural Gamma Ray-Density-Porosity Logging Data (cont.)

Dep

th (

mbs

f)

200

250

300



1.1 2.1g/cm3Maximum Density




200

250

300

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

529

SITE 1042

530


HOLE 1042C

alure-u-out-dedls.

r- ac-itynddi-a-tor

-er


Logging Tools


At Hole 1042C only the CDR = compensated dual resistivity (re-sistivity-gamma ray) was used.

Processing



Resistivity data processing: A deconvolution technique called“qualitative resistivity overlay” aimed at providing enhanced verticresolutions is used for both shallow and deep resistivity measments to compute output with 1-2-3-4-5 ft vertical resolution (docmentation on this technique is also available upon request). The puts are sampled at a 0.0762-m (3 in) sampling rate and are incluin the database along with the standard 0.1524-m (0.5 ft) channe

Quality Control

During the processing, quality control of the data is mainly peformed by cross-correlation of all logging data. The best data arequired in a circular borehole; this is particularly true for the denstool, which uses clamp-on stabilizers to eliminate mud standoff ato ensure proper contact with the borehole wall. A data quality incator is given by the differential caliper (DCAL) channel, which mesures the tool standoff during the recording. Another quality indicais represented by the density correction (DRHO).

Additional information about LWD logs can be found in the “Explanatory Notes” and “Site 1042” chapters, this volume. For furthquestions about the logs, please contact:


SITE 1042

Hole 1042C: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data

Dep

th (

mbs

f)

0

50

100

150





0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

531

SITE 1042

532

Hole 1042C: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data (cont.)

Dep

th (

mbs

f)

200

250





200

250

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

300 300

SITE 1043


HOLE 1043B

naledodole,

eholen of

alure-cu- out-udedels.

er- ac-ityanddi-a-tor

x-her


Logging Tools




Processing




Density data processing: Density data have been processed tocorrect for the irregular borehole using a technique called “rotatioprocessing,” which is particularly useful in deviated or enlargboreholes with irregular or elliptical shape. This statistical methmeasures the density variation while the tool rotates in the borehestimates the standoff (distance between the tool and the borwall), and corrects the density reading (a more detailed descriptiothis technique is available upon request).

Resistivity data processing: A deconvolution technique called“qualitative resistivity overlay” aimed at providing enhanced verticresolutions is used for both shallow and deep resistivity measments to compute output with 1-2-3-4-5 ft vertical resolution (domentation on this technique is also available upon request). Theputs are sampled at a 0.0762-m (3 in) sampling rate and are inclin the database along with the standard 0.1524-m (0.5 ft) chann

Quality Control

During the processing, quality control of the data is mainly pformed by cross-correlation of all logging data. The best data arequired in a circular borehole; this is particularly true for the denstool, which uses clamp-on stabilizers to eliminate mud standoff to ensure proper contact with the borehole wall. A data quality incator is given by the differential caliper (DCAL) channel, which mesures the tool standoff during the recording. Another quality indicais represented by the density correction (DRHO).

Additional information about LWD logs can be found in the “Eplanatory Notes” and “Site 1043” chapters, this volume. For furtquestions about the logs, please contact:


533

SITE 1043

534

Hole 1043B: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data

Dep

th (

mbs

f)

0

50

100

150





0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1043

Hole 1043B: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data (cont.)

Dep

th (

mbs

f)

200

250

300





200

250

300

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

535

SITE 1043

536

Hole 1043B: LWD Natural Gamma Ray-Resistivity-Penetration Logging Data (cont.)

Dep

th (

mbs

f)

350

400

450





350

400

450

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

500 500

SITE 1043

Hole 1043B: LWD Natural Gamma Ray-Density-Porosity Logging Data

Dep

th (

mbs

f)

0

50

100

150







0

50

100

150

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

537

SITE 1043

538

Hole 1043B: LWD Natural Gamma Ray-Density-Porosity Logging Data (cont.)

Dep

th (

mbs

f)

200

250

300







200

250

300

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

SITE 1043

Hole 1043B: LWD Natural Gamma Ray-Density-Porosity Logging Data (cont.)

Dep

th (

mbs

f)

350

400

450







350

400

450

-15 5ppmUranium

-8 12ppmThorium

0 10wt.%Potassium

Dep

th (

mbs

f)

539

500 500

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