Publications

Over the years, borehole seismic technique has been used to provide high resolution seismic imaging when conventional surface seismic could not provide the resolution needed for accurate interpretation. Positioning receivers down-hole near the target reflectors results in seismic signal attenuation only half of that encountered by conventional surface seismic acquisition. The evolution of this technology was driven by the fact that proper seismic imaging is critical to successful commercial field development. This paper presents a case study from Offshore Malaysia where a walkaway vertical seismic profile (WVSP) was successful in obtaining sufficient seismic imaging to delineate reservoirs underneath a gas cloud. Improvements in the resulting image enabled the interpreter to define the top reservoirs, which was not possible from the surface seismic. Based on these findings, the PETRONAS Carigali Sdn Bhd (PCSB) team decided to re-evaluate the technical and economic impacts to the initial field development plan (FDP).