Xrd sample preparation pdf

It fluctuates with time and its value is usually time averaged. Porosity is a fraction between 0 and 1, typically ranging from less than 0. Xrd sample preparation pdf may also be represented in percent terms by multiplying the fraction by 100. Normal particle density is assumed to be approximately 2.

The principal complication is that there is not a direct proportionality between porosity and hydraulic conductivity but rather an inferred proportionality. There is a clear proportionality between pore throat radii and hydraulic conductivity. Also, there tends to be a proportionality between pore throat radii and pore volume. If the proportionality between pore throat radii and porosity exists then a proportionality between porosity and hydraulic conductivity may exist. However, as grain size or sorting decreases the proportionality between pore throat radii and porosity begins to fail and therefore so does the proportionality between porosity and hydraulic conductivity. Black represents solids, blue represents pore space. This can be split into connected and unconnected porosity.

Connected porosity is more easily measured through the volume of gas or liquid that can flow into the rock, whereas fluids cannot access unconnected pores. Porosity is the ratio of pore volume to its total volume. Porosity is not controlled by grain size, as the volume of between-grain space is related only to the method of grain packing. Rocks normally decrease in porosity with age and depth of burial.

Facebook Comments