Abstract:
THE PRESENT ACCOUNT OF CORE ANALYSIS IN MARU 1 OIL AND GAS DEVELOPMENT
COMPANY LIMITED (OGDCL) LEAD TO THE IDENTIFICATION OF RESERVOIR
CHARACTERISTICS (POROSITY AND PERMEABILITY) AND SEDIMENTOLOGY (PETROGRAPHY,
MICROPALEONTOLOGY AND ENVIRONMENT OF DEPOSITION) OF PIRKOH LIMESTONE.
PIRKOH LIMESTONE ENCOUNTERED IN MARU 1 IS OF EOCENE AGE AND CONSISTS OF
LIMESTONE. THIN SECTIONS OF 14 SAMPLES WERE PREPARED FOR THEIR DETAILED PETRO
GRAPHIC STUDIES THAT LEAD TO THE CLASSIFICATION OF PIRKOH LIMESTONE AND ITS
ENVIRONMENT OF DEPOSITION, PETROGRAPHY, MICROPALEONTOLOGY. 30 PLUGS WERE
ANALYZED FOR RESERVOIR CHARACTERISTICS I.E. POROSITY AND PERMEABILITY.
ALL THE STUDIED SAMPLES OF PIRKOH LIMESTONE ARE CLASSIFIED AS WACKSTONE,
BOUNDSTONE, GRAINSTONE, PACKSTONE CONSISTING OF MICROFOSSILS AND MATRIX AS
CEMENTING MATERIAL. IN SOME SAMPLES DISTORTION OF FOSSILS ARE PRESENT. THE
ENVIRONMENT OF DEPOSITION IS HIGH ENERGY SHALLOW MARINE.
THE PLUG ANALYSIS INDICATES THAT THE POROSITY IS GOOD TO VERY GOOD (12.20 TO
27.46%) AND PERMEABILITY IS LOW TO FAIR (0.11 TO 6.59 MD). THE REASON OF LOW
PERMEABILITY OF SUCH SAMPLES AT CERTAIN INTERVAL COULD BE DUE TO THE
ARGILLACEOUS NATURE OF LIMESTONE.
