Method of deep penetration well logging using three receivers

Patent · Tue Jun 10 04:00:00 EDT 1986

OSTI ID:5485132

Cox, P T; Warren, W F; Nussbaum, T W

A well logging method is described for determining the dielectric constant and/or conductivity of earth formations, some of which has fluid invasion, in the vicinity of a well borehole. The method consists of: transmitting electromagnetic energy into the earth formation from a first location in a borehole at a frequency which enables the electromagnetic energy to propagate throughout the surrounding earth formations, receiving electromagnetic energy at second, third and fourth locations in a borehole, where the second location is a predetermined distance from the first location, the third location is at a greater predetermined distance from the first location than the second location and the fourth location is at a greater predetermined distance from the first location than the third location, providing signals representative of the received electromagnetic energy at those locations, and determining the dielectric constant and/or resistivity of the earth formations in accordance with the signals provided by the receiving step the determining step includes: deriving an amplitude ratio from the signals representative of the received electromagnetic energies at the second and third locations, and deriving the phase difference between signals representative of the received electromagnetic energies at the third and fourth locations.

• Assignee: Texaco Inc., White Plains, NY
• Patent Number(s): US 4594551
• OSTI ID: 5485132
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
AMPLITUDES
BOREHOLES
CAVITIES
CONTROL
DEPTH
DIELECTRIC PROPERTIES
DIMENSIONS
DISTANCE
ELECTRIC CONDUCTIVITY
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
EQUIPMENT
FREQUENCY CONTROL
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
RECORDING SYSTEMS
RESISTIVITY LOGGING
RESOURCES
SIGNALS
SURVEYS
WELL LOGGING
WELL LOGGING EQUIPMENT