Experimental Study on Core Analysis for Determination of Sand Stone Resistivity

M.J.A. Prince and Anton Jefferson

Department of Petroleum Engineering, AMET University, Chennai - 603112, India.

DOI : http://dx.doi.org/10.13005/bbra/1416

ABSTRACT: The objective of this study includes the determination of porosity, grain density, permeability and resistivity characteristics of the sandstone reservoir. The Technical studies are carried out on eight core samples of the Sandston Reservoir. Then the core processing is done on core samples which include core cutting, core cleaning, core drying and sample preservation. Through which the Basic parameters such as length and diameter of the samples are determined. The effective porosity measured from Helium Porosimeter has been observed to be in the range of 7.2 to 14.4 %. The permeability to air, measured by air permeameter, has been found to be in low range i.e. 0.002 to 0.59md indicating that plugs are from tight sandstone reservoir. Grain density has been found to in between 2.62gm/cc to 2.67gm/cc, which also indicates the sandstone lithology. The resistivity measurement have been carried out at ambient temperature using the equipment known as LCR meter having two electrode system. The experiment has been carried out on eight core samples corresponding to the sub layer S2 of the sandstone reservoir. The brine solution of different salinities has been used for experimental studies that are 15g/l and 200 g/l as Nacl. The 15g/l brine solution represents the salinity of the formation and 200g/ l brine solution has been taken mainly for removal of effect of clay conductivity during resistivity analysis. The values of tortuosity coefficient ‘a’ and cementation factor ‘m’ for both 15g/l as NaCl and 200g/l are also determined.

KEYWORDS: Core analysis; Sand stone resitivity

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