This paper will focus on a High-Pressure High-Temperature (HPHT) carbonate gas field in Central Luconia, Field X, offshore Sarawak, Malaysia. Discovery of field X was made based on a 2009 3D legacy Pre-Stack Time Migration (PreSTM) seismic data and an exploration well drilled in 2013. The main challenge for this field is to move from the exploration phase into the field development phase, without acquiring additional seismic or well data. One of the ways forward, is to extract new information via seismic data reprocessing. The reasons for this are the cost of seismic reprocessing is marginal compared to drilling an appraisal well and there is significant improvement in the seismic processing and seismic inversion technology over the last decade. Full Waveform Inversion (FWI), combined with other latest processing technology, are the key workflows in this seismic reprocessing that determines the quality of the results. A quantitative interpretation (QI) study was subsequently performed to conclude the seismic study and enhance reservoir understanding in preparation for field development planning.

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