Changes

[[File:Aapg 4.png|350px|thumbnail|center|Figure 4 Identification Polaity Offshore Seismic Data<ref name=Abdullah />]]

[[File:Aapg 4.png|350px|thumbnail|center|Figure 4 Identification Polaity Offshore Seismic Data<ref name=Abdullah />]]

Different trick is used to identify polarity of onshore seismic data. If target is carbonate or regional geology target has coal lithology. Polarity prediction can assume that Carbonate has strong AI than other lithology. That mean if carbonate contact to other lithology will show very strong amplitude because the contrast IA.is high. Picture below shows. If top carbonate has strong amplitude with red color amplitude. The change polarity of other lithology to top carbonate commonly from low to high IA, if red reflector is negative amplitude so polarity of this data is SEG normal.<ref name=Abdullah />

Different trick is used to identify polarity of onshore seismic data. If target is carbonate or regional geology target has [[coal]] lithology. Polarity prediction can assume that Carbonate has strong AI than other lithology. That mean if carbonate contact to other lithology will show very strong amplitude because the contrast IA.is high. Picture below shows. If top carbonate has strong amplitude with red color amplitude. The change polarity of other lithology to top carbonate commonly from low to high IA, if red reflector is negative amplitude so polarity of this data is SEG normal.<ref name=Abdullah />

[[File:Aapg 5.png|300px|thumbnail|center|Figure 5 Identification Polarity Onshore Seismic Data<ref name=Abdullah />]]

[[File:Aapg 5.png|300px|thumbnail|center|Figure 5 Identification Polarity Onshore Seismic Data<ref name=Abdullah />]]