Radio frequency resistivity and dielectric constant well logging utilizing phase shift measurement

Patent · Tue Mar 15 04:00:00 EST 1977

OSTI ID:7214379

Cox, P T; Meador, R A; Thompson, L W

The invention disclosed herein includes methods and apparatus for determining the resistivity and dielectric constant of earth materials in the vicinity of a well borehole. A radio frequency electromagnetic field in the frequency range from 20 to 40 megahertz is generated in a borehole and the total electromagnetic field at two longitudinally spaced locations is detected. Measurements of the relative phase shift in the field between the detector locations and the amplitude of the field at least at one of the detector locations may then be interpreted according to predetermined relationships in terms of the earth formation resistivity and dielectric constant. 6 claims, 6 figures.

• Assignee: Texaco Inc.
• Patent Number(s): US 4012689
• OSTI ID: 7214379
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BOREHOLES
CAVITIES
DIELECTRIC PROPERTIES
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EQUIPMENT
FREQUENCY RANGE
GEOLOGIC DEPOSITS
MHZ RANGE
MHZ RANGE 01-100
PETROLEUM DEPOSITS
PHASE SHIFT
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
RESISTIVITY LOGGING
RESOURCES
RF SYSTEMS
WELL LOGGING