Educational tool for understanding seismic acquisition, processing, and interpretation
Simulate the acquisition of seismic data using reflected waves from subsurface layers.
Acquisition Parameters:
The seismic acquisition phase involves generating seismic waves that travel through the subsurface and are reflected back to receivers at the surface. The time it takes for waves to travel from source to reflector and back to receiver depends on the velocity of the medium and the depth of the reflector.
Adjust the source position and receiver parameters to see how they affect the recorded seismic traces.
Apply processing techniques to enhance signal quality and prepare data for interpretation.
Processing Workflow:
Seismic processing enhances the signal-to-noise ratio and prepares the data for interpretation. Key steps include filtering to remove noise, applying gain control to balance amplitudes, and stacking multiple traces to enhance signal quality.
Experiment with different processing parameters to see how they affect the seismic data quality.
Analyze seismic data to determine the velocity model of the subsurface.
Velocity Analysis:
Velocity analysis is crucial for accurate depth conversion. By analyzing how seismic waves travel through different materials, we can determine the velocity structure of the subsurface. This is typically done using semblance analysis, constant velocity stacks, or NMO analysis.
Click on the semblance panel to pick velocities at different times. These picks will be used for depth conversion.
Convert time-domain seismic data to depth using velocity information.
Depth Conversion:
Depth conversion transforms seismic data from the time domain to the depth domain using velocity information. This is essential for accurate subsurface mapping and interpretation. Professional seismic sections typically display data as wiggle traces with variable density fill.
Adjust the velocity model, display settings, and wiggle trace parameters to create a professional-quality depth section.
Interpret the seismic data to identify subsurface structures and layer boundaries.
Interpretation Workflow:
Seismic interpretation involves identifying and mapping subsurface features such as layer boundaries (horizons) and faults. Professional interpreters often work with wiggle traces to identify precise peak and trough positions that correspond to geological interfaces.
Click on the seismic section to pick horizons. Use auto-tracking to automatically follow strong reflectors across the section.