Clay bound water calculation software

Archie, simandoux, indonesia, fertl, and sw ratio the archie equation was the first empirical model built 1942 to estimate the water saturation in non conductive matrix rocks. It uses clay bound water conductivity instead of wsts bqv factor see eqs. Shale basics in petrophysical analysis, shale volume is one of the key answers used later to correct porosity and water saturation for the effects of clay bound water, cbw. From comparison to log analysis results, it appears that some clay bound water remains in many cases, so phicore lies between total and effective porosity from log analysis. Therefore, the density log is used to calculate the porosity of a shale gas reservoir. Sw calculations from laboratory capillary pressuresaturation pcsw. The bound water volume varies with clay type, depth of burial, and burial history. In actuality, the maths is very straightforward to program nowadays. Measurements of claybound water and total porosity by. Archies formula for water saturation calculation in a shalefree reservoir is presented as. Petrophysical approach for estimating porosity, clay volume, and wa. Shale volume estimation is the first calculation step in a log analysis. Assuming clay bound water is driven off by heating and drying, then phicore equals total porosity.

Calculating porosity and water saturation slideshare. In compliance with european union eu legislation for visitors from the eu, schlumberger requests your permission to place cookies on your computer to both. Several commercial software packages are available that perform these s w calculations for. Being more qualitative than quantitative, they rely on local knowledge andor the log analysts good judgment. Soil water characteristics hydraulic properties calculator. The best way to calculate total porosity is using the density log, correcting for. In the written program, all three unknowns have been determined. Cec is dependant upon mineralogy, but also the surrounding water, its salinity, ph, temperature, pressure, and the type of cations in the water. Pdf quantification of clay mineral and log response. After clay bound water correction corrected mercury injection capillary pressure data now match far better with actual gas water or oil water capillary pressure data and the porosity now reflects the clay bound water and will result in more representative reserve estimations. A synthesis of nmr and resistivity requires an estimate of the wet clay volume and its contribution to conductivity. Clay bound water, due to the high cec of clays is only part of the total bound water. In other words, effective porosity is total porosity less the volume of clay bound water.

Pdf determination of nmr t2 cutoff for clay bound water in. Total porosity may be defined as all the pore space containing fluids water, oil or gas. Clay bound water is understood to include the interlayer water, although the. An improvement in cation exchange capacity estimation and water. Quantification of clay mineral and log response toward reservoir rock properties. We have had about 6 inches of rain since and the pond looks great. Since clays andor clay bound water typically affect all logging devices, a variety of clay estimators can be constructed. Core technology program of the korea institute of energy. When shale has high clay content, the neutron porosity log is overestimated due to the hydrogen effect of clay. Petrophysical approach for estimating porosity, clay. A case study of carynginia formation, perth basin, western australia. This water does not move when fluid is flowed through the rock. Pdf determination of nmr t2 cutoff for clay bound water.

This program estimates soil water tension, conductivity and water holding capability based on the soil. Interactive petrophysics calculate shale volume youtube. Water within the clay lattice or near the surface within the electrical double layer. Its been almost 2 months since i treated our pond with your product. In the current work, cementation exponent in free water mf and clay bound water. Quicklook petrophysical math crains petrophysical handbook. Determination of nmr t2 cutoff for clay bound water in shales. In the normal definition used by a log analyst, clay bound water is not part of the effective porosity and is the difference between total porosity and effective porosity. The nmr tool is sensitive to the difference between bound and free water i. Polymer calculator, calculate how much polymer i need.