RESERVOIR, DEPOSITIONAL, ENVIRONMENTS, BODIES, OFFSHORE, WESTERN NIGER DELTA

One hundred and seventy seven ditch cutting samples were collected from Tomswell, Vals-Field, Niger Delta, at interval of 5715-5730ft to 8680-8695ft which marks the total depth of the well. The samples were subjected to sedimentological, mechanical and heavy mineral separation analysis. Ten (10) depths of interest were selected for proper analysis using a mechanical sieve machine. Pickett crossplots were integrated in evaluating the reservoir quality and depositional environment of sand bodies of the Toms-well in the Val’s Field, Offshore Niger Delta. Evaluated parameters include; storage properties (porosity, saturation), flow property
(permeability) as well as reservoir heterogeneities. Results show that the sand are texturally and compositionally matured. The corosity is fine to medium. The presence of cementing materials act as barriers to vertical flow of fluids but porosity is however preserved and permeability is enhanced by other processes such as coating of the grains by micro-quartz which slows down cementation. The sandstones are sourced from mainly felsic igneous rocks and from low to high grade metamorphic rocks. The depositional system is fluvial while the depositional environment is coastal plain. On the whole, the reservoir quality of the Toms-well, Val’s field is good and will yield optimal output on production.