Seismic data

The marine data are a 3-D DMO'ed poststack data volume acquired over a salt intrusion in the Gulf of Mexico, donated by Halliburton Geophysical Services to SEP. The test data set used here is a smaller portion of the complete data set. I am using 30,000 poststack traces binned on a 300x100 surface grid, with a decimated inline (300) spacing of 37.5 m and an original crossline (100) spacing of 25 m, representing a surface area of 11 km inline by 2.5 km crossline. The traces were decimated to 8 ms to save memory, without loss of signal bandwidth.

Figures and show a crossline and inline section respectively, sliced from near the center of the input stacked data volume. The crossline section shows a sedimentary anticline over some rough diffractions related to salt. The inline section shows fairly gently dipping sediments abutting a region of steep dip diffractions and reflections associated with salt-sediment interfaces.

 

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Figure 2 Crossline section from near the center of the input stacked data volume. Notice the sedimentary anticlinal structure uplifted by the underlying salt (rough diffraction region).

 

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Figure 3 Inline section from near the center of the input stacked data volume. The strong diffraction and steep-dip reflection energy is associated with salt-sediment interfaces. Some weak evidence of shallow faulting is seen at 8 km distance at 1.5 seconds.