Fracture identification and productivity predictions in a carbonate reef complex

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6633992

Dennis, B; Georgi, D T; Callow, G O

In order to optimize well completions and production in naturally fractured reservoirs and to predict the effectiveness of enhanced oil recovery schemes, the in-situ fractures must be located and described. A combination of log measurements and core data were employed to locate and orient fractures and assess their overall contribution to reservoir performance in a Devonian reef complex. These techniques include the imaging of the well bore with the Formation MicroScanner Log (FMS) (Mark of Schlumberger) and the Borehole Televiewer (BMTV). The image data were compared to detailed core analysis, where available, and were used to determine the length, orientation, and probability of fractures as a function of porosity. The Array-Sonic (Mark of Schlumberger) tool was also run to help identify fractured zones using full waveform data and to quantify producibility from Stoneley wave data in comparison to flowmeter production logs. From the comparison of the images with core, the utility of the FMS and BHTV logs were established in identifying fractures and fracture sets as well as determining the orientation and vertical extent of the fractures. In addition, the response of FMS images to different porosity types was confirmed by core data. Comparison of the Array-Sonic data and the flowmeter production log data established the usefulness of the Stonely wave attenuation as a means of identifying permeable zones. The study results permit better definition of tool response to porosity types and fractures, and reveals the influence of fractures on the overall production of the reef complex. These results have implications on the initial and secondary production techniques of this and other carbonate reservoirs.

• OSTI ID: 6633992
• Report Number(s): CONF-880301-
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
DATA ANALYSIS
DEVONIAN PERIOD
EQUIPMENT
EXPLORATION
FRACTURED RESERVOIRS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOPHYSICS
IMAGE PROCESSING
MINERAL RESOURCES
PALEOZOIC ERA
PERMEABILITY
PETROLEUM DEPOSITS
PROCESSING
REEFS
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
WELL LOGGING
WELL LOGGING EQUIPMENT