Carbonate rocks resistivity determination using dual and triple porosity conductivity models

The rocks may be classified as Archie rocks or Non-Archie rocks,depending on the link between pore structure and resistivity of the rock.For carbonate rocks,keeping this factor in view,the applicability of Archie's law tends to be unreasonable and employing Archie's equation will ultimately lead to inaccurate estimates of the water saturation.Numerous investigators have reported models that forms a link between laboratory results and field well logs to determine water saturation in intricate pore systems.In case of complex systems,Archie's law fails to correctly define the resistivity-index curves.In addition,it is imperative to carry out investigations at lower saturation values in order to elaborate the non-Archie characteristics.This brings the dual and triple porosity conductivity models into the equation.As these models are essential in defining the considerable changes of the resistivity-index curves,both qualitatively and quantitatively.The linkage between the two models is depicted electrically in series or in parallel.Moreover,it is possible to have a combination of the two configurations.As a result,the experimental results can be modeled accurately using least parameters.This work presents two models to determine water saturation in carbonate rocks,containing dual and triple porosity systems.This study also investigates the impact of different influential parameters such as saturation exponents,conductivity ratios,and pore volume fraction of each network systems,on the new models.Finally,the effect of each parameter is individually studied and the sensitivity analysis on the RI curves is produced.A new approach to apply these models is also explained which requires the use of NMR log,mercury injection capillary pressure(MICP)measurement,and simple plotting techniques to determine the water saturation.The proposed new models help petrophysicists to estimate water saturation in Non-Archie rocks,containing double and triple porosity network systems.

Study on water saturation computation models in complex pore volcanic reservoir

Determination of water saturation is important for reservoir evaluation. When complex pore structures such as fracture and cavity are present in reservoir, Archie equation is no longer suitable. According to different models of pore structure division, the authors studied water saturation conlputation models. The results show that dual porosity system is divided into four models. The first model is based on dual laterolog, the second is Dual Porosity I , the third is Dual Porosity Ⅱ , and the last one is based on the conductive pore. Besides, the triple porosity system is triple porosity model. Compute water saturation was using all the above five models in volcanic reservoir in Songnan gas field. The triple porosity system is the most suitable model for water saturation computation in complex pore structure volcanic reservoir.