Secondary field dielectric constant and/or resistivity well logging system and method
This patent describes an apparatus for determining the dielectric constant and/or resistivity of earth formations traversed by a borehole comprising: means for transmitting electromagnetic energy into the earth formation from a first location in the borehole at a frequency within a frequency range of 10 MHz to 60 MHz, receiving means for receiving electromagnetic energy at two locations in the borehole spaced longitudinally from the transmitting means and providing the signals representative of the total electromagnetic field at those locations, and determining means connected to the receiving means for determining the dielectric constant and/or resistivity of the formations in accordance with portions of the signals from the receiving means corresponding to secondary electromagnetic fields at the two receiving locations; the determining means includes: secondary field ratio means for deriving a secondary field ratio from portions of the signals representative of the secondary electromagnetic fields at the two receiving locations; and phase difference means for deriving a phase difference between the signals provided by the receiving means.
- Assignee:
- Texaco Inc., White Plains, NY
- Patent Number(s):
- US 4687995
- OSTI ID:
- 6166032
- Resource Relation:
- Patent File Date: Filed date 5 Mar 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
NATURAL GAS DEPOSITS
RESISTIVITY LOGGING
PETROLEUM DEPOSITS
BOREHOLES
DIELECTRIC PROPERTIES
ELECTROMAGNETIC FIELDS
ELECTROMAGNETIC RADIATION
MHZ RANGE 01-100
SIGNALS
CAVITIES
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
FREQUENCY RANGE
GEOLOGIC DEPOSITS
MHZ RANGE
MINERAL RESOURCES
PHYSICAL PROPERTIES
RADIATIONS
RESOURCES
WELL LOGGING
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration