Borehole logging tool utilizing electromagnetic energy in the determination of dip of subsurface formations surrounding a borehole
This patent describes an electromagnetic logging tool for use in the determination of the dip of subsurface earth formations surrounding a borehole. This tool consists of: a. a borehole tool adapted for movement through the borehole and having at least two antenna arrays positioned at spaced-apart locations along the longitudinal axis of the tool. Each of the antenna arrays has at least three antenna sub arrays spaced approximately equally around the longitudinal axis of the tool for transmitting and receiving electromagnetic energy; b. means for simultaneously supplying electromagnetic energy to each of the sub arrays of the two antenna arrays for transmitting electromagnetic energy into the earth formations; c. means coupled to each of the sub arrays of the two antenna arrays for detecting the amplitudes of the electromagnetic signals returning to the sub array from the earth formations; d. means for determining the amplitude differences between the electromagnetic signals received by each of the sub arrays in each of the two antenna arrays to provide at least three amplitude differences for each antenna array; and e. means for determining the phase of each of the amplitude differences of the first antenna array with respect to the corresponding amplitude difference of the second antenna array.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4578645
- OSTI ID:
- 5720571
- Resource Relation:
- Patent File Date: Filed date 1 Feb 1984
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electromagnetic logging apparatus with button antennas for measuring the dielectric constant of formation surrounding a borehole
Method and apparatus for dielectric well logging of subsurface earth formations with a lumped constant antenna
Related Subjects
47 OTHER INSTRUMENTATION
58 GEOSCIENCES
PETROLEUM DEPOSITS
ELECTROMAGNETIC SURVEYS
WELL LOGGING EQUIPMENT
DESIGN
OPERATION
AMPLITUDES
ANTENNAS
BOREHOLES
DEPTH
GEOLOGIC STRATA
INCLINATION
POSITIONING
SIGNALS
SPACE DEPENDENCE
CAVITIES
DIMENSIONS
ELECTRICAL EQUIPMENT
ELECTRICAL SURVEYS
EQUIPMENT
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
RESOURCES
SURVEYS
020200* - Petroleum- Reserves
Geology
& Exploration
440400 - Well Logging Instrumentation
580203 - Geophysics- Geophysical Survey Methods- (1980-1989)