Image and fracture analysis（裂缝成像测井）.pdf

文档介绍：Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
Image and fracture analysis
Trevor Williams
Borehole Research Group, LDEO
Hole 1309D, mid Atlantic
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
Types of downhole image tools
- Electrical Resistivity: FMS (Formation MicroScanner),
FMI (Formation MicroImager),
RAB (Resistivity-At-Bit), etc
- Ultrasonic: UBI (Ultrasonic Borehole Imager),
BHTV (BoreHole TeleViewer), etc
- Video.
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
Downhole video
Clear drilling fluid is required
for downhole video - not often
the case.
J. Nelson, COLOG
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
Unwrapped borehole images
0° 180° 360°
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
The first downhole
images?
Thompson / Loran 1904,
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
Downhole video
J. Nelson, COLOG
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
Resistivity Images
Needs water-based drilling fluid
(not oil-based)
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
FMS (Formation Micro-Scanner)
Resistivity Images
40 cm
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
FMI
Well Logging Principles and Applications: Borehole Image Analysis. April 11, 2008
FMS Processing
Processing is required to convert the 64 electrical current traces recorded
into a color-scale resistivity image.
1. Speed correction. For "stick and slip" - irregular tool motion.
2. Equalization. Between button electrodes and between pads.
3. Button correction. ., "dead buttons" the defective trace is replaced
by traces from adjacent good buttons.
4. EMEX voltage correction. During l