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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


18th Annual Convention Proceedings (Volume 1), 1989
Pages 269-288

Experience with Surface and Downhole Vector Wavefield Recording in Central Sumatra

Eddy Murhantoro, Jeff Wright

Abstract

A VSP survey was acquired in January 1987 in the Minas Field, the largest oil field in S.E. Asia which has already produced more than 3 billon barrels of oil. The source for the VSP was a 200 cu.in. airgun in a mudpit. The downhole sensor was a three Previous HitcomponentNext Hit (3C) SAT tool. This led to the discovery that the airgun was an efficient source of energy for shear Previous HitwavesNext Hit in addition to P-Previous HitwavesNext Hit. The shear Previous HitwavesNext Hit data was then used with the P-Previous HitwavesNext Hit data to correlate to lithology. To increase the S-Previous HitwavesNext Hit velocity data base, three additional wells were recorded using the airgun source in a pit. These data enabled the development of Vp-Vs relationships for Central Sumatra for further use in seismic amplitude versus offset modelling.

The interest generated by the new S-Previous HitwavesNext Hit data led to surface recording of 3C data using single Galperin geophones. The Sikladi area was chosen for the first experiment as previous conventional recording showed two shallow bright spots associated with gas accumulations. The objective was to gather additional data via converted Previous HitwavesNext Hit. The correlation of P-SV to P-P reflections, both generated by an explosive source, confirmed the extra potential of shear Previous HitwavesTop for discriminating hydrocarbon bearing zones.

Both examples of downhole and surface recording of 3C data demonstrate the usefulness of vector wavefield techniques in the Central Sumatra area.


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