Spatial frequency method and apparatus for investigating earth conductivity with high vertical resolution by induction techniques
This patent describes an induction sonde for measuring a characteristic of an earth formation traversed by a borehole comprising: a support member; transmitter means secured to the support member for transmitting an electromagnetic induction signal into the formation about the sonde; and receiver means secured to the support member a preselected distance from the transmitter means for receiving induction signals from the formation thereby determining the vertical response as a function of depth, the preselected distance being selected to provided a sonde with no zeros in the spatial frequency response in the frequency range of interest, the spatial frequency response being the Fourier transform of the vertical response.
- Assignee:
- Schlumberger Technology Corp., Houston, TX
- Patent Number(s):
- US 4837517
- OSTI ID:
- 5748886
- Resource Relation:
- Patent File Date: 16 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
NATURAL GAS DEPOSITS
INDUCTION LOGGING
PETROLEUM DEPOSITS
WELL LOGGING EQUIPMENT
ELECTRIC CONDUCTIVITY
ELECTROMAGNETIC FIELDS
EXPLORATION
GEOPHYSICS
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
EQUIPMENT
GEOLOGIC DEPOSITS
MINERAL RESOURCES
PHYSICAL PROPERTIES
RESOURCES
WELL LOGGING
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Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
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