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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association

Abstract


27th Annual Convention Proceedings, 2000
Pages 1-17

Simultaneous Previous Hit3DNext Hit 4C - OBC & Previous HitVSPNext Hit Walkaway Survey in the Attaka Field, East Kalimantan, Indonesia

Bill Borland, Phil Johnston, Mike Reblin, Suta Vijaya, Omar Kulbrandstad, Muhammad Idrees, Scott Leaney, Jan van de Mortel

Abstract

A 4-component (4C), Previous Hit3DNext Hit, 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 Previous HitdataNext Hit was acquired to determine the shear wave velocity structure in the area. This included a Previous Hit3DNext Hit Previous HitVSPNext Hit acquisition which was done simultaneously with the Previous Hit3DNext Hit OBC acquisition, a comprehensive walkaway Previous HitVSPNext Hit acquisition, and a dipole sonic log. This borehole Previous HitdataNext Hit allows the 4C seismic to be tied to the well control, and provides needed input for 4C Previous HitdataNext Hit 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 Previous HitdataNext Hit.

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 Previous HitdataNext Hit;

2) low Vs values were recognized in the near surface. These impact depth conversion, statics computation, and moveout correction steps in 4C OBC Previous HitdataNext Hit processing;

3) communications links between Previous HitVSPNext Hit and OBC recording equipment allowed a Previous Hit3DNext Hit Previous HitVSPNext Hit to be effectively acquired simultaneously with a 4C Previous Hit3DTop OBC survey.


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