New Perspectives On Seismic Sequence Imaging In The Geological Challenging Frontier M9 West, Offshore Myanmar

Abstract

M9 West, offshore Myanmar is located in the Moattama basin which is approximately 95 km south east from Yadana field. The water depth ranges from 70 to 500 meters. Modern bathymetry was extracted from 2D seismic data and illustrated that M9 West is situated on the continental shelf to slope. M9 West offshore Myanmar area was drilled by 2 wells and covered by a large number of existing 2D seismic lines with various vintages during 1997 to 2011. All 2D seismic data were acquired by using conventional seismic acquisition technique which provided the limited frequency bandwidth and led to high uncertainty of seismic interpretations. In order to fully explore over M9 West, PTTEPI acquired the new 3D seismic data with Deep‐Towed Dual‐Sensor 3D Marine Broadband Seismic Acquisition covering area of 3,080 km2 full fold with 14 streamers. The objective are to improve quality of seismic imaging, to minimize the uncertainty of seismic interpretation and mapping as interpreted in 2D seismic data and to increase the level of confidence for prospect identification to support future exploration and development activities in M9 West area. In addition, to better understand the depositional processes related to sea level change along shelf and reaffirm the geological play model, the high‐resolution seismic sequence stratigraphy study has been conducted by utilizing the new 3D seismic to establish the potential play model. The seismic data was processed covering the Miocene clastic and Carbonate/Volcanic intervals through PSTM. As the result, sequence stratigraphic interpretation, the seismic synthetic section was interpreted and possible to update more detail of the system tracts and facies distribution. The increase of in seismic resolution tends to show more laterally discontinuous reflections, related to lateral facies terminations. A top and base of sequence boundaries are detectable and interpretable on the dataset. Clearer imaging over slope progradation can be observed. Facies variations in the fan system are clearly visible and highlighted. In conclusion, reliable seismic sequence stratigraphy is highly valuable in this frontier area and help to de‐risk M9 West exploration due to the bandwidth extension from broadband technique. This leads seismic interpreter to step closer to be able to discern the rock properties, reservoir distribution and fluid content of potential reservoirs. Moreover, it might be changed the understanding of the basin and hopefully unveil its great potential in Moattama basin.

AAPG Datapages/Search and Discovery Article #90331©2018 AAPG Asia Pacific Region GTW, Back to the Future – The Past and Future of Oil and Gas Production in the Asia Pacific Region, Bangkok, Thailand, September 26-27, 2018