RESERVOIR DISTRIBUTION AND SLOPE CHANNEL SYSTEM SEDIMENTATION MODEL ANALYSIS, A CASE STUDY OFFSHORE KUTAI BASIN, EAST KALIMANTAN
Up to date the exploration and the exploitation in the deepwater area is considered as new matter, particularly in Indonesia. Only one deepwater basin of the some basins in Indonesia which has been proven to be able to produce hydrocarbon, namely offshore Kutai basin. Therefore the data and th...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/77073 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Up to date the exploration and the exploitation in the deepwater area is considered as
new matter, particularly in Indonesia. Only one deepwater basin of the some basins in
Indonesia which has been proven to be able to produce hydrocarbon, namely offshore
Kutai basin. Therefore the data and the study of the reservoir in the area need to be
more explored in detail so therefore required more accurate and effective techniques.
One of the techniques which used to help analyze and interpret the image of the
geological subsurface condition is seismic amplitude attribute. Seismic signals which
generally used to obtain reservoir information is amplitude. Interpretive approach to
evaluate the reservoir from the attributes of the amplitude is using a simple
assumption, namely bright spot on seismic data. This assumption based on the value
of the amplitude, it will be higher when hydrocarbon saturation is high, gross
thickness is becoming thicker (although with several complications with tuning
effect).
Extraction of seismic amplitude attributes RMS (Root Mean Square) is intended to
see the extremely changes of the lithology, such as the existence of a reservoir layer.
Seismic attributes extracted from 3D seismic data Pre-Stack Time Migration (PSTM)
and three wells data (J-1, J-2 and J-3) for calibration this analysis. From the result of
amplitude attributes RMS extraction is well detected by the amplitude on analysis
window from 5 ms to up and 5 ms to down. The results of the analysis show the
hydrocarbon potential in the slope channel system, at the Pliocene age, Kutai Basin,
with the direction of deposition leads to the North West - South East (NW-SE), with a
width ranging between 300 m - 1 km, 1–10 km long and a thickness ranging between
10-60 m.
Using this methodology for modeling and reservoir distribution in the slope channel
system can be used as an alternative interpretation of the reservoir in this area. The
result of RMS amplitude extracted from the horizon which interpreted from the
seismic data shows a fairly good correlation between amplitude and thickness of the
reservoir and its validated with well data. The results of interpretation shows that
currently the reservoir layer package it looks most likely is the result of the process of
filling the valley (gully). The existence of layered reservoirs on the slope system is
closely related to geomorphology and rise and fall of sea level. |
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