Site: Lamont-Doherty Earth Observatory, Palisades, NY

Well: Lamont Test Well 4 (TW-4)

Total depth: 1802 ft (549.2 m)

Casing depth (driller): 750 ft (228.6 m)

Casing depth (logger): 744 ft (226.8 m )

Nominal hole diameter (bit size): 3.78 in.

Logging date: 10/3/2013 (Schlumberger) - 12/5/2013 (USGS)

Logging company: Schlumberger/USGS

Sampling interval: 0.5 ft (0.1524 m) - Schlumberger

Sampling interval: 0.01 ft (0.003 m) - USGS

 

General Information

Test Well 4 (TW4) was drilled to a total depth of 1802 ft (549.2 m). It penetrated the outcropping Palisades sill (0-695 ft, 0-211.8 m), the Newark basin sediments (695-1711 ft, 211.8-521.5 m)), and the underlying metamorphic basement (1711-1802 ft., 521.5-549.3 m). The shallow part of the hole was cased to 750 ft (228.6 m). A bridge formed soon after drilling in the weathered horizon at the top of the basement and did not allow logging tools to reach the hole total depth.

 

USGS Tools/Measurements

1. Three-Arm Caliper (9074 Series), Century Geophysical Corp. / Well diameter; caliper run separately - measurements acquired logging up

2. Magnetic Susceptibility (9622 Series), Century Geophysical Corp., dual-focused coils, 1.44 MHz operating frequency - measurements acquired logging up

3. Inclinometer and Magnetometer (9622 Series), Century Geophysical Corp., Slant angle and azimuth - measurements acquired by 2-axis inclinometer and 3-axis magnetometer

4. Multifunction Tool (9041 Series), Century Geophysical Corp. / Ambient temperature, natural gamma ray, shot normal resistivity (16N), long normal resistivity (64N), lateral resistivity (64N/16N), fluid (mud) resistivity, spontaneous potential, single-point resistance - measurements acquired logging down.

5. Optical Borehole Televiewer (ALT OBI), Mount Sopris Co. / Borehole Imaging

6. Acoustic Borehole Televiewer (9804 Series), Century Geophysical Corp. / Borehole Imaging

7. Electro Magnetic Flow Meter (9721 Model), Century Geophysical Corp. / Hydrologic testing

 

The USGS data are available online in LAS format.The depth in the LAS files is given in feet. A null value of -99999.0 may replace invalid log values.

The hydraulic test data are available online in ASCII format.

Borehole Televiewer data are available online in Well CAD format.

 

Schlumberger Tools/ Measurements

 

Tool string
Run
Top depth (ft)
Bottom depth (ft)
Notes
1. ISLT/ILDT/ITGN
Main
639.5
1710
Casing at 744 ft. No sonic waveforms. No density measurement.
2. IDFR/ILDT/ITGN
Main
0
1710
Casing at 744 ft
3. PSPT/RSTC
Main
604
1717
Casing at 744 ft. Inelastic/Capture Mode

 

ISLT/ILDT/ITGN - iFlex Sonic Logging Tool/iFlex Lithodensity Tool/iFlex Telemetry-Gamma/Neutron Tool

IDFR/ILDT/ITGN - iFlex Induction Dual FormationResistivity Tool/ iFlex Lithodensity Tool/iFlex Telemetry-Gamma/Neutron tool

PSPT/RSTC - Production Services Platform/Reservoir Saturation Pro Tool

 

The Schlumberger data have been converted into ASCII format and are included in the online database. The depth in the ASCII files is given in feet.
Logs such as the gamma ray, recorded in the cased portion of the hole should be used qualitatively only, as the signal from the formation is affected by the presence of casing.
A null value of -999.25 may replace invalid log values.

 

For further information, please contact:

 

Natalia Zakharova

Phone: 845-365-8726

Fax: 845-365-3182

E-mail: nzakh@ldeo.columbia.edu

 

Cristina Broglia

Phone: 845-365-8343

Fax: 845-365-3182

E-mail: chris@ldeo.columbia.edu