After the summer of the second year of growth the plant produces seeds. One individual can produce 100,000 to 180,000 seeds. These seeds are released in close proximity to the plant and can remain viable for over 100 years. The invasive common mullein prefers dry and sandy soils, but is adaptable to many soil types.
primary porosity. (geology). Natural porosity in petroleum reservoir sands or rocks. 1  Facebook. 2  Twitter.rimary porosity. (geology). Natural porosity in petroleum reservoir sands or rocks. 1  Facebook. 2  Twitter.
Most oil and gas has been produced from sandstones. These rocks usually have high porosity, and are usually âhigh perm.â Porosity and permeability are absolutely necessary to make a productive oil or gas well.The petroleum geologist must stay focused on the porosity and permeability of the prospective reservoir.orosity. Porosity of a rock is a measure of its ability to hold a fluid. Mathematically, porosity is the open space in a rock divided by the total rock volume (solid + space or holes). Porosity is normally expressed as a pecentage of the total rock which is taken up by pore space.