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Abstract
Sui Main Limestone (SML) is the best reservoir in the Middle Indus Basin of Pakistan. It is an important reservoir that has produced gas for the last fifty (50) years and continues to produce 600 MMCF per day. The characteristic microfossil assemblages within the SML have been studied from fifty two thin sections of the reservoir rock from four Sui wells for understanding the reservoir architecture and quality. There are two distinctive fossil assemblages within SML Formation. The major lower part (>300m) is a carbonate facies of massive fossiliferous limestone dominated by Nummulites along with Alveolina, Discocyclina and Miliolids. The upper part (20m) consists of argillaceous fossiliferous limestone interbedded with calcareous shale layers, making a transition to the overlying Ghazij shales. Assilina is the characteristic fossil with its associated assemblage
References
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