Inversion of prestack seismic data for reservoir characterization, offshore Andaman Sea, Thailand

Abstract

There are several methods for determining and predicting the fluid content of the petroleum reservoir rocks such as seismic inversion and Amplitude Versus Offset (AVO) analysis. This project presents one of seismic inversion methods called Simultaneous Inversion. The Simultaneous Inversion is applied to seismic data obtained from offshore Andaman Sea, Thailand, where has been identified as a gas sweet spot. This approach transforms seismic reflection data into elastic properties and quantitatively distinguishes these properties into two rock units—shale and sandstone. In addition, inversion results are compared with observations from previous AVO analysis study to confirm the distribution of the gas reservoir model. In conclusion, this project suggests that the seismic inversion is a more suitable method to apply to seismic data from offshore Andaman Sea.