SC3-RAV™ 2011 - Baziw Consulting Engineers Ltd.

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3.4 Data Stack BCE SC3RAV 2011 Seismic Data Analysis Software The Data Stack option allows the user to post-stack acquired seismic cone time series. When selecting this option the file input dialog box shown in Figure 37 appears where the user selects the seismic files to stack. The user can input multiply seismic files in this dialog box (i.e., plus left mouse click or plus left mouse click). After specifying the files to be stacked, the user is asked to specify whether the stacked seismic trace should be stored in ASCII or Binary format (see Figure 38). Finally, the user is prompted to specify the directory and file name of the stacked time series as is shown in Figure 39. Figure 37: Data Stack file input dialog box Figure 38: Specifying the format to save stacked time series Figure 39: Specifying the directory and name of the stacked time series Version 11.1.0 Page 25 file
BCE SC3RAV 2011 Seismic Data Analysis Software 3.5 Signal Decay The Signal Decay option allows the user to minimize the effect of possible source wave multiples on the first arriving source wave, and applies an exponential decay function to the selected time series data after a user specified time. Figure 40 shows the user interface for this software option. The Initial Time Decay (ms) and Decay Factor (1/ms) are required user input. The Decay Factor is defaulted to 0.5. As the Decay Factor is increased, there is a sharper decay of the time series data at the specified time index. Figure 41 illustrates the use of this option on time series data with the Initial Time Delay set to 154 ms and a Decay Factor of 0.5. The traces in red are the decayed seismic data where the effects of the source wave multiples have been minimized significantly. It should be noted that if the user want to apply the day from the start of the trace to the Initial Decay Time then check box Front End Decay must be checked. The Initial Time Decay parameter assumes that any pre-trigger data has been removed from the seismic trace. For this reason, it is advised that software option Display Pre-trigger is unchecked when determining the Initial Decay Parameter within software options Depth Profile and View->Seismic Data. When applying the SC1-RAV software Signal Decay, the saved file will not retain the pretrigger information. 3.6 Polarity Change Figure 40: User interface for Signal Decay Figure 41: Example of applying the Signal Decay option to time series data with source wave multiples The Polarity Change option facilitates the user in selecting a set of seismic data files (similar interface to that outlined in Depth Profiling) and subsequently changing the polarity of the time series. Version 11.1.0 Page 26
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SC3-RAV™ 2011 - Baziw Consulting Engineers Ltd.

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