Borehole logging method for fracture detection and evaluation

Patent · Tue May 16 04:00:00 EDT 1989

OSTI ID:5717386

Hornby, B E; Johnson, D L

A method is describe for locating a fracture in a subsurface earth formation traversed by a borehole, the method using an acoustic source and at lest one acoustic detector traversing the borehole at a plurality of depths, the fracture positioned outside the direct path from the acoustic source to the at least acoustic detector, the method consists of the steps of: generating a first signal from the acoustic source, the first signal representative of Stoneley wave propagating in the borehole, receiving the first signal at the at least one detector, the first signal representative of Stoneley waves propagating in the borehole from the acoustic source to the at least one detector, receiving a second signal at the at least one detector, the second signal representative of reflections of the Stoneley wave, the reflections arising from an interaction of the Stoneyle waves and the fracture; and combining the first and second received signals to derive a fracture signal indicative of a characteristic of the fracture.

• Assignee: Schlumberger Technology Corp., New York, NY
• Patent Number(s): US 4831600
• OSTI ID: 5717386
• 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
EQUIPMENT
EXPLORATORY WELLS
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
RESOURCES
SEISMIC SOURCES
SONIC LOGGING
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS