Step-by-Step SeiSee Tutorial for Processing Seismic Profiles
SeiSee is a powerful, lightweight, and free software tool used widely in geophysics to view, analyze, and process seismic data in SEG-Y format. Whether you are a student or an experienced geophysicist, mastering SeiSee allows you to quickly quality-check (QC) data and apply essential processing workflows. This step-by-step tutorial will guide you through the process of opening, analyzing, and applying basic processing steps to a seismic profile. Step 1: Install and Launch SeiSee
Before processing, ensure you have the latest version of the software.
Download SeiSee from the official software repository or developer website.
It is a portable application, meaning it does not require a complex installation; simply extract the ZIP file. Double-click the SeiSee.exe file to launch the program. Step 2: Open Your SEG-Y File
Seismic profiles are typically stored in standard SEG-Y format. Click on File in the top menu bar and select Open. Browse your computer to locate your .sgy or .segy file. Select the file and click Open.
A geometry configuration window may appear. For standard viewing, accept the default parameters and click OK. Your seismic section will now appear on the main screen. Step 3: Configure Visual Display Settings
To effectively process and interpret your profile, you must optimize how the seismic waves are displayed.
Choose Display Mode: In the top toolbar, toggle between Wiggle (shows trace lines), Grayscale (variable density), or Color modes. Grayscale or color fills are usually best for regional structural analysis.
Adjust Gain: Seismic signals lose energy as they travel deeper. Use the Gain tool (often represented by a slider or multiplication factor like x1, x2, x5) to boost weak signals at later times without clipping the shallow data.
Zooming: Use the magnifying glass icons or scroll your mouse wheel to zoom into specific reflectors or areas of interest. Step 4: Analyze Trace Headers
Understanding the metadata embedded within your seismic file is critical before applying any processing filters.
Click on View and select Trace Headers (or click the header table icon).
A spreadsheet view will open, showing parameters for every single trace, such as Source/Receiver coordinates, Shotpoint numbers, Ensemble numbers, and Sample intervals.
Verify that the time sampling rate (e.g., 1ms or 2ms) and total trace length match your project specifications. Step 5: Apply Frequency Filtering (Bandpass Filter)
Seismic data often contains unwanted low-frequency ground roll or high-frequency ambient noise. SeiSee features built-in processing filters to clean this up. Navigate to the Processing or Filter menu. Select Bandpass Filter.
Input your frequency cut-offs. A standard starting filter for shallow seismic data might be a trapezoidal filter like 10-20-80-120 Hz. This allows frequencies between 20Hz and 80Hz to pass through completely while cutting off extreme lows and highs.
Click Apply to instantly see the noise reduction on your profile. Step 6: Adjust Automatic Gain Control (AGC)
If standard gain manipulation isn’t enough to balance the amplitude of your profile from top to bottom, apply AGC. Select AGC from the processing options.
Define the AGC Window in milliseconds (e.g., 200 ms to 500 ms). A shorter window balances amplitudes aggressively but can boost background noise, while a longer window preserves more natural amplitude variations.
Click Apply to homogenize the signal strength across the entire time scale. Step 7: Export and Save the Processed Profile
Once you are satisfied with the visual clarity and noise reduction of your seismic profile, you should save your progress.
Save as SEG-Y: To keep the data in a geophysical format for interpretation software, go to File > Save As and export it as a new SEG-Y file. Tip: Never overwrite your original raw data file.
Export as Image: For reports or presentations, go to File > Export Image (or Print to File) to save the section as a BMP, PNG, or PDF format. To help tailor further instructions, tell me:
What type of seismic data are you working with? (e.g., shallow environmental, deep oil & gas, sub-bottom profiler)
What is the primary goal of your processing? (e.g., noise removal, structural interpretation, data conversion)
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