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Density Porosity Since the assiduity of a mixture of components is a analog function of the densities of its individual constituents, it is a simple social occasion to take aim the permeableness of a porous rock. base this purpose it is multipurpose to consider the pouch volume simulate of a average formation with water-filled pore space ( c all 1 ). [pic] |[pic] | |Figure 1 | Unit volume of porous rock consists of a work out ? make up of water and a fraction (1 - ?) made up of straight rock matrix. Thus the bulk density of the sample burn down be written as: ?b = ?ma (1 - ?) + ?f? where ma refers to the matrix density and f refers to the fluid density. truthful rearrangement of the terms l eads to an expression for porosity given by: ?D = (?ma - ?b) / (?ma - ?f) The equivalent concept is illustrated graphically in Figure 2 , where b is plotted against porosity. [pic] |[pic] | |Figure 2 | Note that ranks falling on the line connecting the matrix slur (?ma, ? = 0%) and the water point (?f, ? = 100%) represent all possible cases, extending from zero porosity rock matrix up to 100% porosity. Any mediocre value of ?b corresponds to nigh porosity ?. Note that, rigorously speaking, porosity is a quantitative fraction and that the assumption is made that ?b is equal to ?a, the cock reading. Density porosity, then, can be found either by using a ready reckoner or the map ( Figure 3 ), [! pic] |[pic] | |Figure 3 |...If you want to scramble a full essay, order it on our website: OrderEssay.net

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