Fault-plane reflections

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Seismic Data Analysis
Series Investigations in Geophysics
Author Öz Yilmaz
DOI http://dx.doi.org/10.1190/1.9781560801580
ISBN ISBN 978-1-56080-094-1
Store SEG Online Store

The section in Figure 5.0-2a contains a major listric fault that dips down from left to right. Also, there are many auxiliary faults that intersect this main fault and several antithetic faults which do not intersect it. These fault patterns commonly occur in areas in which extension has taken place. We see reflections associated with the sedimentary strata, as well as faint indications of fault-plane reflections. Along major fault zones, such as those in Figure 5.0-2a, there is often a clear case of conflicting dips. Migration of the stacked section (Figure 5.0-2b) positions the events dipping down from right to left with an acceptable accuracy. Nevertheless, the listric fault can be inferred and traced only by following the termination points of the dipping events.

Figure 5.0-2  Conflicting dips associated with fault planes: (a) CMP stack without dip-moveout correction; (b) time migration of the stack in (a); (c) the stack with dip-moveout correction; (d) time migration of the stack in (c).

The DMO stack shown in Figure 5.0-2c has preserved the conflicting dips associated with the listric fault and the growth faults in comparison with the conventional CMP stack (Figure 5.0-2a). Migration of the DMO stack (Figure 5.0-2d) yields a crisp image of the fault planes associated with the growth faults in contrast with the image from migration of the conventional stack (Figure 5.0-2b).

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