SULISTIANA, SULISTIANA (2023) PENENTUAN ZONA HIDROKARBON PADA LAPANGAN “ SLS” FORMASI NGIMBANG BERDASARKAN HASIL ANALISIS PETROFISIKA. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
i
SARI
Cekungan Jawa Timur Utara merupakan cekungan yang sudah banyak dilakukan kegiatan
eksplorasi minyak dan gas bumi salah satu Formasi yang menarik dan dijadikan target pada penelitian
adalah Formasi Ngimbang karena Formasi Ngimbang dapat berperan sebagai batuan sumber dan
reservoar. Maka penulis melakukan penelitian untuk membuktikan keberadaan reservoar lapangan SLS
formasi Ngimbang yang terdiri 4 well log yaitu ST – 7, ST – 6, ST – 1, dan ST – 2.
Metode yang digunakan dalam penelitian ini berupa dua metode yakni metode analisis data
kualitatif menggunakan log sumur dengan penentuan variasi litologi, fasies, dan lingkungan
pengendapan, serta korelasi sumur. Metode kuantitatif meliputi analisis petrofisika yang berupa volume
shale, porositas, dan permeabilitas, serta saturasi air. Analisis Kualitatif dan kuantitatif ini dilakukan
menggunakan data wireline log yang divalidasi oleh data routine core analysis, well report, dan data
mud log.
Berdasarkan hasil analisis kualitatif, didapatkan litologi batulempung, batupasir, dan batugamping.
Pada sumur pengamatan pengendapan dengan sistem transgresi berupa TST dengan marker FS. Pada
lokasi penelitian didapatkan fasies berupa calcalreous sandstone channel facies, interlaminated shale
and sand facies, laminated shale and sand facies, dan detrital limestone facies yang diendapkan pada
lingkungan tidal flats, estuarine chanel, offshore bars, dan logoon. Hasil analisis petrofisika zona X1
sumur ST – 7, ST – 6, ST – 1, ST - 2 dari data reservoar summary menunjukkan akhir dari permebilitas
sebesar 88%. Sedangkan nilai porositas sebesar 20,3%, 28,2%, 16,5%, dan 14,4% . Nilai Vsh sebesar
0,7%, 24,5%, 10,9%, dan 11,8%. Nilai saturasi air sebesar 67%, 69%, 68%, dan 70% pada zona X1
Formasi Ngimbang. Hasil cut – off dari analisis petrofisika yang dapat divalidasi menggunakan RCAL
(routine core analysis) yaitu sumur ST – 2 zona X1 memiliki nilai porosity sebesar 14,4%, water
saturation sebesar 70%, dan volume shale sebesar 11,8% sehingga dapat disimpulkan bahwa sumur ST
– 2 produktif terdapat hidrokarbon berupa oil yang telah disandingkan menggunakan well repot.
Sedangkan pada sumur ST – 7, ST – 6, ST – 1 terdapat hasil pay – zone yang artinya pada lapisan
tersebut prospek sebagai lapisan hidrokarbon hal ini sudah disandingkan menggunakan data well repot,
namun pada sumur ST – 7, ST – 6, dan ST – 1 tidak dapat divalidasi menggunakan RCAL karena tidak
terdapat data tersebut.
Kata Kunci : Cekungan Jawa Timur Utara, Formasi Ngimbang, Analisis kualitatif, Analisis kuantitatif.
ii
ABSTRAC
The North East Java Basin is a basin where a lot of oil and gas exploration activities have been
carried out. One of the formations that is interesting and targeted for research is the Ngimbang
Formation because the Ngimbang Formation can act as a source rock and reservoir. So the author
conducted research to prove the existence of the Ngimbang formation SLS field reservoir which consists
of 4 well logs, namely ST – 7, ST – 6, ST – 1, and ST – 2.
The methods used in this research are two methods, namely the qualitative data analysis method
using well logs to determine variations in lithology, facies and depositional environment, as well as
well correlation. Quantitative methods include petrophysical analysis in the form of shale volume,
porosity and permeability, as well as water saturation. This qualitative and quantitative analysis was
carried out using wireline log data which was validated by routine core analysis data, well reports and
mud log data.
Based on the results of qualitative analysis, the lithology of mudstone, sandstone and limestone
was obtained. In the sediment observation well, the transgression system is in the form of TST with FS
marker. At the research location, facies were found in the form of calcalreous sandstone channel facies,
interlaminated shale and sand facies, laminated shale and sand facies, and detrital limestone facies
which were deposited in tidal flats, estuarine channels, offshore bars and logoon environments. The
results of the petrophysical analysis of zone X1 wells ST – 7, ST – 6, ST – 1, ST - 2 from the reservoir
summary data show a final permeability of 88%. Meanwhile, the porosity values are 20.3%, 28.2%,
16.5% and 14.4%. The Vsh values are 0.7%, 24.5%, 10.9%, and 11.8%. Water saturation values are
67%, 69%, 68%, and 70% in zone X1 of the Ngimbang Formation. The cut-off results from
petrophysical analysis that can be validated using RCAL (routine core analysis), namely the ST - 2 zone
X1 well has a porosity value of 14.4%, water saturation of 70%, and shale volume of 11.8% so it can
be concluded that the ST – 2 well is productive, containing hydrocarbons in the form of oil which has
been aligned using a well troubleshooter. Meanwhile, in the ST - 7, ST - 6, ST - 1 wells there are pay -
zone results, which means that the prospect of this layer as a hydrocarbon layer has been compared
using troublesome well data, but in the ST - 7, ST - 6, and ST wells – 1 cannot be validated using RCAL
because there is no such data.
Keywords: North East Java Basin, Ngimbang Formation, Qualitative analysis, Quantitative analysis.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | North East Java Basin, Ngimbang Formation, Qualitative analysis, Quantitative analysis. |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 13 Nov 2023 03:04 |
| Last Modified: | 13 Nov 2023 03:04 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/38126 |
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