# rock lab 1 - Porosity:is a quantitative expression of the...

• Lab Report
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Porosity :is a quantitative expression of the volume of the empty spaces (or pore volume ) between the solid grains and the total volume of the conventional core plug . 100 B P V V Where : V p =pore volume V b =bulk volume Porosity can be classified from engineering point of view into types : 1. Absolute porosity (total porosity ): is the ratio of the total volume of the voids in the rock to the total volume of the rock . 2. Effective porosity : is the ratio of the volume inter conacted voids in the rock to the total volume of the rock . Factors effect of porosity : 1. Geometry of grain packing 2. Hetrogenity of grain size :

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3. Cemention 4. Fracture 5. Dissolution Laboratory measurements of porosity : 1. saturation method. 2. mercury method. 3. helium method We measure the porosity to determine the volume or the amount hydrocarbons ( OOIP ) in the reservoir by equation :
Bo Sw) AhΦhΦ 7758 N Where : A = area Φ = porosity h = thickness Sw = water saturation Bo = formation volume factor prepare the sample with following steps : 1.

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• Fall '16
• Ratio, Soil physics, Effective porosity, rock sample

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