Delaware Basin core at 9,820 ft: low GR, high resistivity, bimodal NMR T2, and FMI with ghost stylolites; thin section shows euhedral dolomite rhombs and moldic porosity, yet k is an order of magnitude below what porosity suggests. What diagenetic overprint would you call for the porosity–permeability mismatch?
I’d call it stylolite-associated cementation with late saddle dolomite/anhydrite choking the pore throats — the molds bump phi but tiny throats crush k, which fits the bimodal T2 and high Rt. We saw k jump about 6x on similar Delaware plugs after a toluene Soxhlet and rerun; try a solvent extraction on a twin plug and see if it moves, @corehound?
I’d tag it as tight, nonplanar saddle dolomitization with intercrystalline microporosity plus a bitumen overprint lining the molds — , classic phi>>k at 9,820 ft. The bimodal T2 reads micro vs. mold pores, but MICP should pop a sub‑micron throat mode; do a quick UV/solvent check for bitumen along those ghost stylolites. If it’s clean, a sulfate stain might catch sneaky anhydrite fringes, @melanie_85rich.
At 9,820 ft, stylolite-sourced Fe-calcite rims choking molds; check CL + SEM-EDS on ‘ghost stylolites’?