Local Dip Structure
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Figure above shows the comparison of the original seismic data with local structural dip. The color on both dip attributes is significant to identify the local orientation of dip of the anticline at the area of study. Different parameters have been applied in each attribute to aid in the identification of geological features. For every parameter being used there is a significant contribution for the interpretation being done. Some of it may make the resolution of the data better and some may make it worst. This will affect drastically on the interpretation being done.
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Local structure dip
Local structure dip is the estimation of local dip from the seismic data. This attribute contains three options which are Event, Gradient and Principle Component.
Figure 2: Seismic Cross Section of Event Dip at Inline 1800
From figure 2, we can see that the anticline is symmetrical as both of its limbs are dipping at the same dip. This indicates that the anticline has a gentle slope.
Event dip shows the dip at the downslope area. Based on figure 1, we can see the anticline present dipping at 0Ëš to 20Ëš. The anticline cannot be seen clearly using this option for local structural dip.
Gradient dip shows the instantaneous gradient of the sample neighborhood. In Figure 2 shows the anticline at a visible view. The limbs are dipping about the same which at 0Ëš to 20Ëš. Using this option, the anticline’s resolution is better compared to event dip. It is easier to interpret using the gradient dip.
Principal component dip estimates the local dip estimate form principal component analysis of gradient covariance matrix. From the results, we can see the dipping is same as the event dip and gradient dip which is ranging from 0Ëš to 20Ëš. By using different parameters in Sigma X, Y and Z, we observed that sigma X, Y and Z at value 1.0 gives the best resolution. Below this value, the resolution is really bad.