Targeted High-End Processing to Deliver a Rapid P-Image from the Tangguh ISS® OBN survey

Abstract

Summary Seismic for reservoir development often requires interpretation of the seismic image as early as possible to facilitate well planning. Ultra-high-density Ocean Bottom Seismic (OBS) surveys using BP's Independent Simultaneous Source technology (ISS®) have proven themselves and been very beneficial for recording wide azimuths, long offsets, and high fold data to address complex imaging problems. Multicomponent data processing from OBS surveys can provide additional benefits to the imaging through PZ summation and PS processing etc. However, these benefits require extra processing effort, such as noise removal on the geophone data, which is known to be noisy in shallow water environments. On the other hand, P-only data processing is much less sensitive to these challenges. In this paper, we describe a superfast targeted P-only processing flow, using advanced methods of deghosting, demultiple, velocity model building and migration. The approach is described using data acquired with ISS® technology above ocean-bottom node receivers deployed in relatively shallow (20–80 m) water over the Tangguh LNG gas fields, Indonesia. Despite the huge amount of data to process, the products were delivered within 4 months of the last relevant node retrieval. This acceleration of data delivery supported timely well planning and field-wide development decision making.