Engineering
Calculate the arithmetic average and thickness weighed average porosity for the following data code.
Sample number Depth (ft) Porosity (%)
1 3705.5 40.1
2 3706.5 35.1
3 3707.5 39.3
4 3708.5 36.5
5 3709.5 29.1
Following CT scanning, data are available for a chalk core plug from the North Sea area. The core plug is scanned at equal distance for 9 different slices. The second column provides the CT numbers for a clean sample (denoted as air ref),whereas the third column provides the CT numbers for a 100% brine-saturated sample (denoted as water ref ). CT number for pure water is 32 HU and -1000 HU for air. Calculate the porosities of each slice of this core plug.
Slice No. Air Ref, Hounsfield Units (HU) Water Ref, Hounsfield Units (HU)
1 2651 2966
2 2664 2984
3 2660 2975
4 2670 2987
5 2668 2985
6 2675 2984
7 2681 2989
8 2677 2986
9 2682 2995
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