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Resolution:

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29-11-2021 Geophysics 215

Vertical Resolution: • Vertical Resolution is the ability to detect and map thin events such as reservoir sand bodies • It is determined by the average frequency and bandwidth of the seismic data • We can typically resolve down to ¼ wavelength • Wavelength is determined by frequency and velocity: • λ=V/f so resolution ~ V/(4*f) • Resolution deteriorates with depth

Lateral resolution :

Is the minimum distance between two features required to distinguish them as two separate features on the seismic record. It depends on Receiver spacing, dominant frequency, Velocity, and dip angle. The lateral resolution described by Fresnel Zone – Seismic data image (“illuminate”) an area, rather than a single point as might be suspected from examination of ray path diagrams The diameter of the Fresnel zone (F) depends upon three key variables: – Average velocity down to the horizon of interest (v) – Two-way travel time (t) – Dominant frequency (f) F = v (t/f)1/2 The Fresnel zone will be shrunk by the migration of the data during processing.


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