WellCAD Basics - Advanced Logic Technology

BOOK 1 - WELLCAD BASICS - 137
The following options are available:
Filter Width:
Each filter type uses the data of a user-defined data window to calculate the new
filtered value. The data point to be filtered is centered in the window. The Filter
Width is set in number of data points. After processing the center value the filter
window will be moved one sample and the new center value will be processed.
Filter Type:
Three different filter types are available. Choose the Moving Average to compute
an average value from all the values in the defined filter window and set it as the new
data, filtered point. The Weighted Average option sets a weighted average value,
calculated from the filter window, as new data point. If the Median filter will be
applied the data values within the filter window will be sorted and the median (the
data point at 50%) will be taken as new data value.
The following example shows the three filter types applied with 87 being the current
data point and a filter width of 5.
Moving Average:
Weighted Average:
Median:
85 �
90 � 87 �125�
88
� 95
5
1�85
� 2�
90 � 3�
87 � 2�125
�1�
88
� 96
9
Median(
85,
87,
88,
90,
125)
� 88
Depth Range:
The data from a selected or the entire depth range of the log can be filtered.
A new Well Log will be output as result of the filter process, holding the set of
filtered data values.