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Integrate Seismic to Constrain Uncertainties in Rock Property Distribution: An Previous HitExampleNext Hit from the Far East

Wenche H. Asyee1, Georg Warrlich2, Conxita Taberner1, Maria Boya-Ferrero2, and Ben Stephenson3
1 Shell International E&P, Rijswijk, Netherlands
2 PDO, Muscat, Oman
3 Shell Canada, Calgary, AB

The Malampaya gas Previous HitfieldNext Hit located offshore Philippines in the South China Sea has always been considered to be one of the examples of a complex mid Tertiary isolated platform. The structural history during the platform growth and resulting facies distribution have always been recognized as the main factors controlling the diagenetic processes during the evolution of the Previous HitfieldNext Hit and the resulting property distribution.

Since the discovery of this deepwater (+ 850 meters) gas Previous HitfieldNext Hit in 1991 numerous studies have been carried out to describe and analyze the geological history of the build-up and the distribution of rock properties. From early 2003 until early 2005 the Shell Carbonate Team in Rijswijk (NL) carried out a study integrating all available old and new Previous HitdataNext Hit. Apart from an additional diagenesis study and structural analysis of the Previous HitdataNext Hit also the new high-resolution 3D seismic survey shot by PGS in 2002 was analyzed. This survey was reprocessed by Shell and optimized by Chevron to enhance resolution and decrease noise and artifacts (sea bottom multiples) before stacking.

The attribute analysis of the impedance cube calculated from the high resolution seismic gave new insights in the property distribution of the Previous HitfieldNext Hit. The integration of the acoustic impedance volume with the new and existing geological studies allowed the study team to decrease the uncertainty in the rock property distributions and a renewed understanding of the geological history of the Previous HitfieldTop beyond the time of deposition.

The authors would like to thank PNOC and CHEVRON for their support.