--> ABSTRACT: Fracture Identification and Productivity Predictions in a Carbonate Reef Complex, by B. Dennis, E. Standen, D. T. Georgi, and G. O. Callow; #91030 (2010)
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Fracture Identification and Productivity Predictions in a Carbonate Reef Complex

B. Dennis, E. Standen, D. T. Georgi, G. O. Callow

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 Previous HitBoreholeNext Hit 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 ru to help identify fractured zones using full waveform data and to quantify producibility from Previous HitStoneleyTop 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.

AAPG Search and Discovery Article #91030©1988 AAPG Annual Convention, Houston, Texas, 20-23 March 1988.