Lab 5: Sorting, Velocity Analysis, Stacking
After performing various seismic data processing steps such as data quality control, frequency filtering and deconvolution on the east Texas real seismic data, the objective of today's lab session is to display the true image of the subsurface which required compressing the seismic data to infer a first approximation for such image. This includes : 1. Sorting the shot gathered data into common mid-point gathers (CMP) 2. Picking appropiate stacking velocities and applying accordingly normal move-out corrections (NMO). 3. Stacking all the CMPs such as average each CMP to form stacked CMP and then concatenate all stacked CMP traces together. 1. Common Midpoint Sorting Figure 1: CMP Sorting Seismic data acquisition with multifold coverage is done in shot-receiver ( s, g ) coordinates. Figure 1 depicts the geometry of a CMP gather and raypaths associated with a flat reflector. Note that CDP gather is equivalent to a CMP gather only when reflectors are hor
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