DEPOSITION ANALYSIS OF GOOD QUALITY RESERVOAR (NET PAYING SAND) IN LATE MIOCENE AT âAâ FIELD, KUTAI BASIN USING SEISMIC STRATIGRAPHY AND SEISMIC ATTRIBUTE METHODS
Kutai Basin is the second largest basin with hydrocarbon reserves in Indonesia. Where, research was carried out in one of the fields, namely field "A", where gaseous hydrocarbons have been proven to be found. Currently the production status of the "A" field is postponed becaus...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/77890 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Kutai Basin is the second largest basin with hydrocarbon reserves in Indonesia.
Where, research was carried out in one of the fields, namely field "A", where
gaseous hydrocarbons have been proven to be found. Currently the production
status of the "A" field is postponed because there are geological factors that are
still not well understood regarding reservoar distribution and net pay, the thin
reservoar with stratigraphic traps and the significant difference in hydrocarbon
content in adjacent wells are challenges in this field. So, in this research, seismic
stratigraphy and seismic attribute methods were used to understand this. The
reservoar in field "A" is Late Miocene age in the upper slope channel area.
Research was carried out on the KR70-90 sequence boundary where many
reservoar are found. In KR70-KR90 there are parasequences which generally
consist of LST (Lowstand System Tract) and condensed sections. The net pay
reservoar contained in KR70-KR90 is in the LST (Lowstand System Tract) zone,
with gamma ray log data generally showing a finning upward pattern and several
coarsening upward. The net pay reservoar in field "A" is mostly in the KR70-KR80
sequence with sedimentation rates values higher than the KR80-90 sequence based
on biostratigraphy reports. The sedimentation rates are influenced by the activity
of growing faults in the west of field which controls subsidence and local sea level
changes, where KR70-80 has greater and faster sea level changes. The Sum of
Negative Amplitude attribute is used to map the reservoar while the
Sweetness/Variance attribute maps the net pay. The attribute shows that the
thickness of the reservoar is proportional to the net pay and the position of the well
in the facies. In some cases, a high variance value affects the net pay. |
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