Application of SeaBed Logging (SBL) technology to Support 30 Seismic and AVO Analysis in Identification of Hydrocarbon

SeaBed Logging (SBL) method came into oil and gas exploration industry and
provides geoscientists another tool to explore a prospect by looking at another physical
property, i.e. resistivity, besides acoustic impedance that can be obtained from seismic and
AVO analysis. SBL technology is no doubt a tool to complement seismic interpretation and
AVO analysis by offering an independent data set to exploration works. However, as the
technology is purely based on resistivity contrast down-earth, there're still rooms for
discussion to validate whether or not the technology is capable enough to help in delineating
the true geology of an area.
This study presents the result of a 20 SBL survey over 2 deep water prospects,
Prospect A and Prospect B, in Block 2F, Rajang Delta, offshore Sarawak. These 2 prospects
represent 2 cases that show different seismic interpretation in terms of amplitude anomalies
and different AVO analysis responses. The 30 seismic and AVO analysis of Prospect A do
not show any amplitude anomaly at the crest of the structure but at the flank of the structure.
Meanwhile for Prospect B, 30 seismic shows a high amplitude anomaly at both crest and
flank sides of the structure; and a Class III AVO response showed in the AVO analysis over
the crest of Prospect B.
The result of SBL survey over both Prospect A and Prospect B are then collaborated
to the seismic interpretation and AVO analysis. It is clearly showed that the SBL responses
matches well with the high amplitude features seen in seismic and AVO analysis of Prospect
B; and SBL only shows weak response in the case where both seismic and AVO analysis
hardly show anything like in Prospect A.