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Title: Tuned borehole gravity gradiometer

A tuned borehole gravity gradiometer is described for detecting variations in gravity gradient which consists of: a suspended dipole mass system having symmetrically distributed dipole masses and suspension means for suspending the dipole masses such that the gravity gradient to be measured produces an angular displacement about a rotation axis of the dipole mass system from a reference position; and tuning means with the dipole mass system for selectively varying the sensitivity to angular displacements with respect to the rotation axis of the dipole mass system to variations in gravity gradient, wherein the tuning means includes means for selectively varying the metacentric height of the dipole mass system.
Authors:
;
Publication Date:
OSTI Identifier:
5563613
Report Number(s):
US 4581932
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 20 Dec 1984
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 47 OTHER INSTRUMENTATION; GRAVITY LOGGING; WELL LOGGING EQUIPMENT; PETROLEUM DEPOSITS; BOREHOLES; DIPOLES; GRAVITY SURVEYS; INCIDENCE ANGLE; ROTATION; SENSITIVITY; TUNING; CAVITIES; EQUIPMENT; GEOLOGIC DEPOSITS; GEOPHYSICAL SURVEYS; MINERAL RESOURCES; MOTION; MULTIPOLES; RESOURCES; SURVEYS; WELL LOGGING; 020200* - Petroleum- Reserves, Geology, & Exploration; 440400 - Well Logging Instrumentation