Clay bound water calculation software

Quicklook petrophysical math crains petrophysical handbook. Determination of nmr t2 cutoff for clay bound water in shales. Sw calculations from laboratory capillary pressuresaturation pcsw. The nmr tool is sensitive to the difference between bound and free water i. Quantification of clay mineral and log response toward reservoir rock properties. Archies formula for water saturation calculation in a shalefree reservoir is presented as. Pdf effectivemedium resistivity models for calculating water. Clay bound water is understood to include the interlayer water, although the. The bound water volume varies with clay type, depth of burial, and burial history.

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. Soil water characteristics hydraulic properties calculator. Cec is dependant upon mineralogy, but also the surrounding water, its salinity, ph, temperature, pressure, and the type of cations in the water. A case study of carynginia formation, perth basin, western australia. In the current work, cementation exponent in free water mf and clay bound water. Its been almost 2 months since i treated our pond with your product. Water within the clay lattice or near the surface within the electrical double layer. Several commercial software packages are available that perform these s w calculations for. In actuality, the maths is very straightforward to program nowadays. Calculating porosity and water saturation slideshare. When shale has high clay content, the neutron porosity log is overestimated due to the hydrogen effect of clay. This water does not move when fluid is flowed through the rock. Total porosity may be defined as all the pore space containing fluids water, oil or gas. A synthesis of nmr and resistivity requires an estimate of the wet clay volume and its contribution to conductivity.

Pdf determination of nmr t2 cutoff for clay bound water. Assuming clay bound water is driven off by heating and drying, then phicore equals total porosity. Pdf quantification of clay mineral and log response. Petrophysical approach for estimating porosity, clay volume, and wa. In other words, effective porosity is total porosity less the volume of clay bound water. Petrophysical approach for estimating porosity, clay. Interactive petrophysics calculate shale volume youtube. 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. In the written program, all three unknowns have been determined. Pdf determination of nmr t2 cutoff for clay bound water in. Therefore, the density log is used to calculate the porosity of a shale gas reservoir. Clay bound water, due to the high cec of clays is only part of the total bound water. Core technology program of the korea institute of energy.

Shale is a finegrained, clastic sedimentary rock composed of mud that is a mix of clay minerals and tiny fragments siltsized particles of other minerals, especially. 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. The best way to calculate total porosity is using the density log, correcting for. In compliance with european union eu legislation for visitors from the eu, schlumberger requests your permission to place cookies on your computer to both. Being more qualitative than quantitative, they rely on local knowledge andor the log analysts good judgment. Polymer calculator, calculate how much polymer i need. This program estimates soil water tension, conductivity and water holding capability based on the soil.

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. Measurements of claybound water and total porosity by. It uses clay bound water conductivity instead of wsts bqv factor see eqs. An improvement in cation exchange capacity estimation and water.