Experimental Investigation of Overburden Pressure Effect on Cementation Factor Measurement of a Reservoir Rock

The cementing factor or porosity exponent is one of the most important Archie parameters, which is a major source of uncertainty in the calculation of water saturation for a given reservoir condition. In carbonate rocks, due to the sensitivity of this parameter to pore type, water saturation estimation has associated with high inaccuracy. Laboratory measurements also are available just for few cases. This parameter normally varies in range of 1 to 5. Despite of great importance of this factor in reservoir studies, there is no general and precise relationships for the reservoirs in Iran, and saturation calculations are carried out by the equations usually with great errors. Hence, developing a reliable correlation according to the local geology to determine this property accurately is of crucial importance.In this study, in order to establish a new correlation relationship between the mentioned parameter and effective confining stress, 68 core samples from one of the biggest Middle East carbonate reservoirs were evaluated and this effect was investigated. Concluded results show that there is no sensitive relationship between these two parameters.

Keywords:

Water Saturation , Archie equation , Cementation factor , Overburden pressure