Abstract
Offset Vertical Seismic Profile (OVSP) surveys have seen increasing application in recent years as a valuable field development tool. Primary use, however, has been for the detection of small faults and structural features inadequately resolved by surface seismic data. This paper presents the results of an OVSP survey where recovery of reflection amplitudes related to limestone porosity was the primary objective. The survey was recorded in 1987 over the Jene field in South Sumatra, Indonesia. The reservoir at Jene is a reefal buildup within the Miocene Baturaja Limestone Formation, with oil trapped stratigraphically by updip permeability reduction towards the edge of the reef. OVSP data were recorded using tri-axial well geophones, and an airgun source. The data was processed for compressional and mode converted shear reflections. The greater resolution of the OVSP data indicated an anomalous amplitude reduction in the Baturaja Limestone reflection which, in conjunction with subsequent reprocessing of surface seismic data, has led to the interpretation of a small reef prospect located adjacent to Jene, considered to have a high probability of containing oil.
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