Propagation anisotropic well logging system and method

Patent · Tue Jan 13 04:00:00 EST 1987

OSTI ID:6828236

Savage, K D; Cox, P T; Paap, H J

This patent describes an apparatus for determining the anisotropy of an earth formation by measuring both vertical and horizontal resistivity of the formation in the vicinity of a borehole traversing the earth formation comprising: first transmitter means located in the borehole and spatially arranged with the earth formation in a first predetermined manner for transmitting electromagnetic energy into the earth formation at a frequency within a frequency range from 0.5 MHz to 4 MHz, second transmitter means located in the borehole and spatially arranged with the earth formation in a second predetermined manner for transmitting electromagnetic energy into the earth formation at a frequency within a frequency from 0.5 MHz to 4 MHz, first receiving means spatially arranged with the earth formation in the first predetermined manner and spaced a first predetermined distance from the first transmitter means for receiving electromagnetic energy from the earth formation and providing a corresponding signal, second receiving means spatially arranged with the earth formation in the first predetermined manner and spaced a second predetermined distance from the first receiving means for receiving electromagnetic energy from the earth formation and providing a corresponding signal, third respective means spatially arranged with the earth formation in the second predetermined manner and spaced the first predetermined distance from the second transmitter means for receiving electromagnetic energy and providing a corresponding signal, and fourth receiving means spatially arranged with the earth formation in the second predetermined manner and spaced a predetermined distance from the third receiving means for receiving electromagnetic energy and providing a corresponding signal.

• Assignee: Texaco Inc., White Plains, NY
• Patent Number(s): US 4636731
• OSTI ID: 6828236
• 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
ANISOTROPY
BOREHOLES
CAVITIES
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
DATA PROCESSING
DATA TRANSMISSION SYSTEMS
DISTANCE
ELECTRIC LOGGING
ELECTROMAGNETIC RADIATION
EQUIPMENT
FREQUENCY RANGE
GEOLOGIC DEPOSITS
MHZ RANGE
MHZ RANGE 01-100
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PROCESSING
RADIATIONS
RESISTIVITY LOGGING
RESOURCES
SIGNALS
SPACE DEPENDENCE
WAVE PROPAGATION
WELL LOGGING
WELL LOGGING EQUIPMENT