SURFACE ATTRIBUTES
1. Root Mean Square (RMS):
The function of RMS amplitude as a post-stack attribute is to compute the square root of the sum of squared amplitudes divided by the number of samples within the specified window used. To map direct hydrocarbon indicators in a zone of interest, we must first measure the reflectivity. As RMS squares every value within the window, it becomes sensitive to noise. We can distinguish between lithologies by using RMS. Porous sands or sinuous channel belts are indicated by high values of RMS.
For our data, the maximum RMS amplitude value is 2.5. We consider the colour present in our data is blue, purple and green. The blue colour varies from dark to light (cyan). Meanwhile, green colour varies from green to yellow. Elevation is varies where the highest elevation is at the middle part represented by blue and purple section. Meanwhile, the lowest elevation are represented by green and yellow section. We can conclude that the middle part is folded by tectonic movement.
1. Maximum amplitude:
The figure shows the horizons of maximum amplitude with the various colours of legend where the maximum positive amplitude that referred as a peak is 2.50 at the green colour. There are 5 horizons that we were detected started from the top layer until the bottom layer that forming the anticline surface. The blue to purple colour that colour range bar of -2.00 to -5.00 indicates the minimum vertical amplitude while the maximum vertical amplitude indicates by yellow to orange colour with the colour range bar of 6.00 to 8.00 . By interpreting these horizons, we can map the strongest direct hydrocarbon indicator within a zone of interest. Maximum amplitude can enhance the DHI hydrocarbon and DHI will appear when a seismic data has a high acoustic impedance rather than low acoustic impedance. From this horizon amplitude we can identify bright spot, polarity reversal and dim spot at the peak of amplitude.
