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Carbonate lithofacies.ppt

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Carbonate lithofacies.ppt

  1. 1. Carbonate sedimentology/1 Dunham (1962) Carbonate classification
  2. 2. Carbonate sedimentology/2 Folk (1962) Carbonate classification
  3. 3. Carbonate sedimentology/3 • Interpretation techniques applied to clastic reservoirs can also be applied to carbonate depositional systems. • Carbonates however, differ from clastics due to the importance of biogenic processes and their susceptibility to diagenetic modifications. Carbonates versus clastics
  4. 4. Carbonate sedimentology/5 • All primary sedimentary structures recognised in siliciclastic rocks can occur in carbonates (e.g. cross-bedding in ooid shoals, slumps etc.) • In addition there may be: – Biogenic structures (reefs etc.) – Diagenetic structures unique to carbonates Sedimentary structures
  5. 5. Carbonate sedimentology/6 The ultimate goal
  6. 6. Carbonate sedimentology/7 Carbonate lithofacies – core calibration Vertical well Boundary between FMI facies FMI7 and FMI4. The burrowed surface is clearly visible (arrowed) as are the packstone-filled burrows below. Burrowed contact (dashed line) between FMIF7 and FMIF4. Burrows (squares) are filled with packstone. Possible hardground. FMIF7 FMIF4 Static image Dynamic image Slabbed core
  7. 7. Carbonate sedimentology/8 Carbonate lithofacies FMI image facies associations vs Ka 0.01 0.10 1.00 10.00 100.00 1000.00 0 1 2 3 4 5 6 FMI image facies association Ka (mD) FMIA1 FMIA2 FMIA3 FMIA4 FMIA5
  8. 8. Carbonate sedimentology/9 Conductive fracture Resistive fracture Fractures in carbonates Vertical well

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