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AAPG Bulletin
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AAPG Bulletin; Year: 2025; Issue: April DOI: 10.1306/02262523078
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Figure 17. Case study 4: West Africa Pre-Salt Aptian. (A) Bar diagram showing pore types (PTs) nested in the petrophysical rock categories (PRC). PT colors are from Figure 16C with PT2 representing common occurrences of high fracture (Frac) density, large pore size and high density and bad holes while PT1 and PT3 have, respectively, very low to moderate presence of bad holes, vug size, and density. Stars identify PRCs with low attribute presence, which are regarded as nonreservoir, whereas PRC8 is an intermediate case based on porosity and permeability ranges. (B) Diagram showing the lumping or grouping of PCRs into final PRCs (FPRCs) based on previously discussed attribute presence and ranges. (C) Table showing summary of PRCs, mineralogy, reservoir quality (RQ), bad holes, and borehole imagery-derived PTs. For mineralogy pie chart legend see Figure 8. EFAC = electrofacies association category; RD = deep resistivity.
Figure 17. Case study 4: West Africa Pre-Salt Aptian. (A) Bar diagram showing pore types (PTs) nested in the petrophysical rock categories (PRC). PT colors are from Figure 16C with PT2 representing common occurrences of high fracture (Frac) density, large pore size and high density and bad holes while PT1 and PT3 have, respectively, very low to moderate presence of bad holes, vug size, and density. Stars identify PRCs with low attribute presence, which are regarded as nonreservoir, whereas PRC8 is an intermediate case based on porosity and permeability ranges. (B) Diagram showing the lumping or grouping of PCRs into final PRCs (FPRCs) based on previously discussed attribute presence and ranges. (C) Table showing summary of PRCs, mineralogy, reservoir quality (RQ), bad holes, and borehole imagery-derived PTs. For mineralogy pie chart legend see Figure 8. EFAC = electrofacies association category; RD = deep resistivity.