Application of 3D iterative SRME for shallow water de-multiple, a case study on data from Phu Quoc Basin in offshore Vietnam

Abstract

This paper presents our continuous effort on multiples attenuation in shallow water environment. The seismic data were acquired at various locations along the offshore of Vietnam, and the interpretation of the data is made difficult due to the presence of shallow water related multiples. Previously, we have demonstrated a two-step workflow of applying first shallow water de-multiple (SWD) and then surface related multiple elimination (SRME) to handle shallow water multiples. This workflow has been proven to be effective as it has been applied on many marine seismic surveys. In this paper, we expand our current workflow by incorporating the data before and after SWD as the dual input for 3D SRME model prediction, namely 3D iterative SRME for shallow water for targeting higher order peg-leg surface related multiples that includes the seafloor as one of the multiple generators. Apart from being data driven, 3D iterative SRME for shallow water also takes into consideration the spatially-varying nature of subsurface structures. We demonstrate, through the real-data examples, that our workflow provides an optimal multiple attenuation solution in the shallow water environment.