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The AAPG/Datapages Combined Publications Database
Indonesian Petroleum Association
Abstract
Simultaneous
3D
4C - OBC &
VSP
Walkaway Survey in the Attaka Field, East Kalimantan, Indonesia
Abstract
A 4-component (4C), 3D
, Ocean-Bottom-Cable (OBC) seismic survey was carried out at Attaka oil field, Kutai Basin, East Kalimantan. The objective was to improve seismic imaging beneath a gas chimney. Borehole geophysical
data
was acquired to determine the shear wave velocity structure in the area. This included a
3D
VSP
acquisition which was done simultaneously with the
3D
OBC acquisition, a comprehensive walkaway
VSP
acquisition, and a dipole sonic log. This borehole
data
allows the 4C seismic to be tied to the well control, and provides needed input for 4C
data
processing algorithms, including common conversion point (CCP) mapping, CCP moveout corrections, and migration.
The walkaways also allowed derivation of Qp and Qs information, which indicated a very low Qp (~19) in the near surface. This low Qp is thought to be responsible for the poor quality compressional seismic data
.
Findings are:
1) Extremely low Qp values associated with a known gas chimney were quantified. These are believed to be responsible for the deterioration of conventional P wave data
;
2) low Vs values were recognized in the near surface. These impact depth conversion, statics computation, and moveout correction steps in 4C OBC data
processing;
3) communications links between VSP
and OBC recording equipment allowed a
3D
VSP
to be effectively acquired simultaneously with a 4C
3D
OBC survey.
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