1.13 The resistivity of a water-bearing sand was found to be 0.4 n-m. If the formation water resistivity is 0.02 N.m, give your best estimate of the formation porosity. What is the statisti- cally possible range of porosity in this sand?

You have been given a clear, well formed mineral crystal to identify. Suppose the crystal volume is 45 cm³ , and the mass is 97.65 g. Which of the following is the most likely composition of this sample? Quartz: density = 2650 kg/m3 Calcite: density = 2710 kg/m³ Aragonite: density = 2930 kg/m³ Halite: density = 2170 kg/m³ Dolomite: density = 2840 kg/m³

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12.. A dissolved contaminant with a concentration of 20 µg/mL is being advecte d with flowing groundwater at a velocity of 0.45 m/day in an aquifer which has a porosity of 25%. Groundwater from the aquifer discharges into a nearby strea m. What is the mass flux of the contaminant into the stream if the aquifer is 2.0 metre thick and 125 m wide where it discharges into the stream?