--> Abstract: Delivering an Efficient, Robust and Comprehensive Petrophysical Evaluation in Carbonate Environments, by Raghu Ramamoorthy, Charles Flaum, Austin Boyd, Nikita Seleznev, Haitao Sun, and Juntao Ma; #90077 (2008)

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Delivering an Efficient, Robust and Comprehensive Petrophysical Evaluation in Carbonate Environments

Raghu Ramamoorthy1*, Charles Flaum2, Austin Boyd3, Nikita Seleznev3, Haitao Sun2, and Juntao Ma2
1Schlumberger, UAE
2Schlumberger, China
3Schlumberger-Doll Research, USA
*[email protected]

Several researchers have shown that petrophysical properties in carbonates are strongly correlated to pore microgeometry. Therefore, accurate petrophysical evaluation requires the integration of texture-sensitive logs such as nuclear magnetic resonance (NMR), borehole images and full waveform acoustic logs. Lithology and porosity evaluation in the presence of anhydrite requires the use of capture spectroscopy logs. A comprehensive and accurate petrophysical evaluation of carbonates requires the use and integration of a large suite of logs. As a result, an easy-to-implement workflow is needed to rapidly and reliably integrate all this data. This presentation shows an interpretation methodology and workflow that facilitates the easy integration of logging measurements essential to accurate carbonate evaluation. The workflow, which is the result of decades of research into carbonate petrophysics, shows that the method provides a rapid, robust, and comprehensive petrophysical evaluation including lithology, porosity, tar quantification, pore-geometry evaluation, permeability and rock types, fluid saturations, relative permeability, and primary drainage capillary pressure curves. Examples are presented from major Middle East carbonate reservoirs. We also present a software implementation that leverages the methodology through an intuitive and user-friendly workflow, enabling the delivery of a comprehensive report on-time. The method has been applied on several wells in the Middle East within a few hours of the receipt of log data at the processing center. On a couple of the wells the results were available before the tools had been pulled out of the well, permitting decisions on subsequent data acquisition and on the completion of the well.

 

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain