Steps taken for a speedy evaluation for successful optimization of water pattern by detailed reservoir characterization, is discussed with reference to an Eocene sandstone reservoir of Kalol field India. The reservoir without water aquifer support has 30 years of production history. Water injection was done for 25 years in a central line drive consisting 8 injectors aligned in N-S direction. The main production problem was the rapid decline in reservoir pressure in the main pool, from 237 to 77 Kg/cm2 for a production of 25% OOIP. Performance reviews carried out in 1981, 1982 and 1990 suggested various steps such as increase in water injection rates, switching to peripheral injection besides central line drive and infill drilling to arrest the decline in reservoir pressure but without success. Integrated genetic facies modeling done in 1992, suggested reduction of the amount and redistribution of water throughout the fiel away from the most permeable parts. This has improved the production performance after 25 years by way of arrest of pressure decline.

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