This research is to assess the influence of regional versus global controls on the diagenesis and reservoir quality of Tertiary carbonate platforms. The three main objectives are: (1) to evaluate controlling influences on diagenesis, fracturing and potential reservoir quality of a Cenozoic syntectonic carbonate platform (Tonasa Formation, Indonesia). (2) To contribute towards understanding diagenetic alteration of volcanogenic covered and/or influenced carbonate platforms. (3) To evaluate controlling influences on diagenetic variability of slope and basinal deposits.