Well logging apparatus and methods for determining formation resistivity at a shallow and a deep depth

Patent · Tue Feb 06 04:00:00 EST 1990

OSTI ID:7017777

Clark, B; Jundt, J; Luling, M; Ross, M O

This patent describes an apparatus for determining the resistivity of earth formations surrounding a borehole. It comprises: means for generating electromagnetic wave energy at a first location in the borehole; means for receiving electromagnetic wave energy at second and third locations in the borehole. The second and third locations being successively spaced longitudinally in the borehole from the first location; means for detecting the phase shift between electromagnetic energy received at the second and third locations in the borehole; means for detecting the attenuation between electromagnetic energy received at the second and third locations in the borehole; means for determining, as a function of the detected phase shift, the resistivity of formations at a relatively shallow depth of investigation around the second and third locations; and means for determining, as a function of the detected attenuation, the resistivity of formations at a relatively deep depth of investigation around the second and third locations.

• Assignee: Schlumberger Technology Corp., Houston, TX
• Patent Number(s): US 4899112; A
• Application Number: PPN: US 7-115503A
• OSTI ID: 7017777
• 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
DESIGN
ELECTRIC LOGGING
EQUIPMENT
EXPLORATORY WELLS
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RESISTIVITY LOGGING
RESOURCES
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS