Spatial frequency method and apparatus for investigating earth conductivity with high vertical resolution by induction techniques

Patent · Tue Jun 06 04:00:00 EDT 1989

OSTI ID:5748886

Barber, T D

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
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ELECTRIC CONDUCTIVITY
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
ELECTROMAGNETIC FIELDS
EQUIPMENT
EXPLORATION
GEOLOGIC DEPOSITS
GEOPHYSICS
INDUCTION LOGGING
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
RESOURCES
WELL LOGGING
WELL LOGGING EQUIPMENT