Nang Nuan field is located in Chumphon basin, which is one of Tertiary half grabens in offshore Thailand. The main reservoir is the Permian Ratburi carbonate reservoir, known as basement of the overlying Tertiary clastic sediments (Figure-1). The geologic understanding of the Ratburi carbonate has been evolving from time to time as new information and analysis are obtained. However, secondary diagenetic process such as caving development system or karstification has been believed to be mainly responsible for the porosity enhancement of the otherwise tight Ratburi carbonates. This paper is aimed to show the influence of fractures to the development of the reservoir in the Pre- Tertiary section and provide different perspective of possible geologic model of Nang Nuan field.


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