FMS Sonic
Uploaded by
Hossein TashaFMS Sonic
Uploaded by
Hossein TashaFMS/DSI-2
Tool String 31.45m
30.56m
Description 28.35m
The Formation MicroScanner / Dipole Shear Sonic Imager
DSI-2
(FMS/DSI-2) tool string provides both resistivity images Dipole Shear Sonic Tool
and acoustic data from an open, fluid-filled borehole. The
FMS consists of four orthogonal imaging pads, each
containing 16 microelectrodes which are in direct contact
with the borehole wall during the recording of data. The
button current intensity is sampled every 0.1 in (2.5 mm). DSI-2
Transmitter-Receiver Section
The tool emits a focused current from the four pads into
the formation, and produces oriented, two-dimensional,
high resolution images of the variations in microresistivity
around the borehole wall. The DSI-2 can acquire a wide
array of acoustic data which are determined by transmitter 12.81m
firing sequences. The DSI-2 is a multi-receiver tool with a
linear array of eight receiver stations, a monopole 10.3m
transmitter and two dipole transmitters. The receiver array Detector 9.92m NGT-C
Natural Gamma Ray Tool
provides multiple spatial samples of the propagating 7.68m
wavefield for full waveform analysis. The arrangement of FMS
the transmitters and receivers allows measurement of wave Formation MicroScanner
w/GPIT
components propagating deeper into the formation.
Applications Pad Contact 0.46m
Formation MicroScanner
♦ Mapping of formation structures
Schematic illustration of the Formation
♦ Dip determination MicroScanner/Dipole Shear Sonic Imager
♦ Correlation of coring and logging depths tool string.
♦ Precise positioning of core sections where core
recovery is less than 100% Deployment Notes
♦ Interpretation of depositional environments The FMS/Sonic tool string combination is always
Dipole Sonic Shear Imager deployed after the Triple Combo tool string. This
♦ Calculation of impedance logs for synthetic important safety precaution is necessary to safeguard the
seismogram generation fragile FMS, which is rare and hard to replace. The FMS
and sonic tools are combined for the purpose of providing
♦ Porosity and pseudodensity estimation
ideal centralization. The FMS/Sonic string also includes
♦ Fracture porosity determination
a Natural Gamma Ray Tool (NGT) for depth correlation
with other tool strings.
Tool String Specifications
Length: 31.45 meters
Diameter: 3.625 inches
Primary Measurements: High resolution microresistivity images, Compressional wave velocity, Shear wave velocity, Natural gamma ray
ODP Logging Services, Lamont-Doherty Earth Observatory, Rt. 9W, Palisades, NY 10964
100 bit size bit size casing
N S N
Pass1
Pass2
washout
200 SGR
300
CGR
Depth (mbsf)
400
washout
500
C1 C2
600
-15 -10 100 300 10 15 10 20 4 6 3 5
Caliper Tool Azimuth Caliper Gamma-Ray Vp Vs FMS
(in) (degrees) (in) (gAPI) (km/s) (km/s)
Sample output of downhole logs obtained with the FMS/Sonic tool string. Shown are caliper (4-arm tool),
computed and standard gamma-ray, compressional-wave, and shear-wave velocity logs, along with FMS images.
FMS/Sonic Tool Specifications
Maximum Maximum Vertical
Tool Acronym Tool Name Diameter Length Sample Interval Logging Speed
Temperature Pressure Resolution
DSI-2 Dipole Shear Sonic Imager 175° C 20,000 psi 3.625 in. 11.6 m 6 in. 3.51 ft 1800 ft/hr
NGT Natural Gamma Ray Tool 149° C 20,000 psi 3.625 in. 2.61 m 6 in. .75 - 1 ft 1800 ft/hr
FMS Formation MicroScanner 176° C 20,000 psi 3.625 in. 7.72 m 0.009 in. (.25 mm) 0.19 in. (5 mm) 1800 ft/hr
11/2001