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I5B-segmentet

I5B-segmentet. Vurdering av seismisk AVO-respons i slumpområder. Top Cook depth map. Seismic profiles indicated as red lines. L2881. Line 2881, I4 segment. 1999 full stack. mid. far. near. Increasing amplitudes with offset indicates oilfilled reservoir. Top Statfjord. Top Brent.

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I5B-segmentet

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  1. I5B-segmentet Vurdering av seismisk AVO-respons i slumpområder

  2. Top Cook depth map. Seismic profiles indicated as red lines L2881

  3. Line 2881, I4 segment 1999 full stack mid far near Increasing amplitudes with offset indicates oilfilled reservoir Top Statfjord Top Brent Top Cook Yellow/red represents a decrease in acoustic impedance Base Crt.

  4. Randomline, I4 segment 1999 full stack mid far near Note the opposite avo response due to the pressure effect (blue arrow) and oilfilled reservoir (red arrow) Top Statfjord Top Brent Top Cook Yellow/red represents a decrease in acoustic impedance Base Crt.

  5. Top Cook depth map. Seismic profile indicated as red line L2995 Top Statfjord Top Brent Top Cook Yellow/red represents a decrease in acoustic impedance Base Crt.

  6. Line 2995, I5B segment (prospect) 1985 1996 1999 1996 Top Statfjord Top Brent Top Cook Yellow/red represents a decrease in acoustic impedance Base Crt.

  7. Line 2995, I5B segment (prospect), offset stacks 1985, full stack mid far near Top Statfjord Top Brent Top Cook Yellow/red represents a decrease in acoustic impedance Base Crt.

  8. Cook-2 and Cook-3 How much does geological setting affect seismic response? Model the seismic response in a three-layer setting with varying thicknesses and fluids

  9. How much does geological setting affect seismic response? • Cook-2 and Cook-3 are very different reservoirs, both in a geological sense and from a production point of view • Cook-2 is 50-60 meters thick, while Cook-3 is 15-50 meters thick, both thinning towards north • In the east the formation is eroded by the BCU. • We know that we can observe pressure build-up in Cook on 4D seismic • We want to predict how water flooding will appear in the 4D seismic, but our model has probably been to coarse, mixing Cook-2 and Cook-3 properties

  10. Shetland BCU Cook-3 Drake Cook-2 How much does geological setting affect seismic response? • Interfaces • Uneroded: Drake->Cook-3 • “Uneroded”: Shetland->Cook-3 • Eroded: Shetland->Cook-3 • Eroded: Shetland->Cook-2 • Fluids • Brine, oil, gas • Thickness variations • Cook-2: 0-60 meters • Cook-3: 0-50 meters Task: Determine the seismic response in a 3-layer model with varying thicknesses and fluids Get parameters from geomodel!

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