Hydrocarbon potential
1. Seismic pull up -anticline or carbonate?
Although our seismic volume shows a pull up effect that might mislead us to a carbonate structure, but after interpretation (by applying attributes ), we concluded that the pull up seismic at (xline 1546 and 1346) is due to the formation of anticline. From the curvature data (figure 3) it show positive curvature which prove it is anticline.
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Figure 1: Seismic pull up at xline 1546 and 1346. A show seismic pull up due to anticline
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Figure 2: Anticline structure from time slice -700
2. Gas Possibility
The seismic show chaotic characteristic at the axis of the anticline, indicates possible gas cloud or column.From the RMS attribute (figure5B) Bright spot is spotted at the uppermost cube is a clear DHI. Furthermore, if you look closely to the gas column (figure 5), you can see a pull down trend (velocity is slower in gas) at the axis of anticline(xline 1446)
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Figure 3: A show, positive curvature show an anticline in the timeslice -700 and inline 1800
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Figure 4: Amplitude shut off inline 1600. (A) shows original seismic and (B) Curvature attribute applied
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Figure 5: (A) Original seismic, (B) RMS and (C) Sweetness from inline 1800 and xline 1446
3. Traps
Although anticline serve as excellent traps, the traps that prevent the gas leakage in our seismic volume is structural trap created by the faults and fractures. The faults and fractures are probably the reason that caused the gas to escape (from a deeper trap not shown in the seismic cube) and migrated.
Figure 6: (D) and (E) is From timeslice -200. before (D) and after (E) RMS attribute applied
Figure 7: Coherence attribute applied, fracture are enhanced visually
Figure 8: before (A) and after Coherence attributes (B)
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