TY JOUR TI Absolute permeability modeling for a clastic unconsolidated reservoir accounting for clay mineral distribution KW unconsolidated sandstone KW absolute permeability model KW clay minerals KW facies analysis KW geological modeling KW hydrodynamic modeling KW heavy oils KW core analysis KW early diagenesis. JO Vestnik AGGE AU Ivanov, D.A. PY 2026 IS PB Association of Geologists, Geophysicists and Engineers