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Pressure Sensitivity of the Joint Elastic-electrical Properties of Carbonate Reservoir RocksNormal access

Authors: L. J. North, A. I. Best and J. Sothcott
Event name: 74th EAGE Conference and Exhibition incorporating EUROPEC 2012
Session: Rock Physics - Elastic Properties
Publication date: 04 June 2012
DOI: 10.3997/2214-4609.20148409
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 326.81Kb )
Price: € 20

Summary:
We compare newly acquired laboratory data of P-wave velocity (Vp, 700 kHz) and electrical resistivity (expressed as apparent formation factor F, 80 Hz) on 24 carbonate samples with a range of porosities and permeabilities, to similar data for shaly sandstones. Crossplots of F - Vp, and the pressure sensitivity of the F - Vp relation, reveal similar trends for carbonates and sandstone, with the carbonates following closely, and extending, the clean sandstone trend. Unlike for shaly sandstones, the carbonate trends are only partly controlled by permeability. Other possible controls include heterogeneity, pore aspect ratio and size distribution.


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