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Principles of equilibrium thermodynamics were applied and found useful in evaluating aspects of Frio diagenesis. Solutionmineral equilibria as predictors of reservoir quality and diagenetic history were tested by comparing formation waters from regions of good and poor reservoir quality, the upper and lower Texas coast, respectively. Comparison among waters from these regions was made on activity diagrams of 16 diagenetic reactions such as calcite = ferroan calcite, kaolinite = chlorite, and Ca-montmorillonite = Na-montmorillonite. Relative position of tested waters, with respect to the stability field of authigenic minerals occluding permeability and porosity, was related to reservoir quality. Solution-mineral equilibria...

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