ANALISIS SPLITTING ALOKASI PRODUKSI DAN PERHITUNGAN CADANGAN MINYAK SISA PADA LAPANGAN “ZR”

Rachman, Farhan Zhahir (2025) ANALISIS SPLITTING ALOKASI PRODUKSI DAN PERHITUNGAN CADANGAN MINYAK SISA PADA LAPANGAN “ZR”. Skripsi thesis, UPN Veteran Yogyakarta.

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Abstract

ABSTRAK
ANALISIS SPLITTING ALOKASI PRODUKSI DAN
PERHITUNGAN CADANGAN MINYAK SISA PADA
LAPANGAN “ZR”
Oleh
Farhan Zhahir Rachman
NIM: 113210062
(Program Studi Sarjana Teknik Perminyakan)
Lapangan “ZR” merupakan salah satu lapangan minyak di fase produksi lanjut yang
mengalami penurunan laju produksi akibat melemahnya tekanan reservoir.
Lapangan ini memiliki komplesi commingle, di mana beberapa lapisan reservoir
diproduksi bersamaan tanpa pemisahan laju produksi tiap layer. Kondisi ini
menimbulkan tantangan dalam evaluasi cadangan minyak sisa karena kontribusi
masing-masing sub-layer tidak terukur secara langsung.
Penelitian ini bertujuan untuk menghitung cadangan minyak sisa pada Lapangan
ZR menggunakan dua metode, yaitu metode korelasi JJ Arps yang didasarkan pada
klasifikasi drive mechanism reservoir, dan metode Decline Curve Analysis (DCA)
yang berbasis data produksi historis. Pendekatan splitting produksi dilakukan untuk
mengalokasikan produksi minyak ke masing-masing sub-layer dengan
mempertimbangkan parameter petrofisika berupa kh(1−Sw), sehingga estimasi
cadangan dapat dilakukan secara lebih akurat pada setiap interval lapisan produktif.
Berdasarkan hasil splitting alokasi produksi menunjukkan bahwa sub-layer F-5B
memiliki kontribusi produksi tertinggi terhadap total produksi lapangan, sedangkan
sub-layer F-3B menjadi lapisan dengan kontribusi terendah. Hasil perhitungan
metode JJ Arps menghasilkan estimasi ultimate recovery (EUR) sebesar 54,37
MMstb dan remaining reserve sebesar 8,67 MMstb, sedangkan metode DCA
menghasilkan EUR sebesar 46,58 MMstb dan remaining reserve sebesar 0,89
MMstb. Selain itu, hasil peramalan DCA menunjukkan bahwa produksi beberapa
lapisan masih dapat berlanjut hingga lebih dari 20 tahun mendatang. Perbandingan
antara dua metode tersebut menghasilkan selisih nilai remaining reserve sebesar
7,79 MMstb. Perbedaan signifikan ini menunjukkan bahwa metode JJ Arps
cenderung memberikan estimasi lebih besar karena didasarkan pada kondisi ideal
reservoir, sementara DCA memberikan hasil yang lebih konservatif dan realistis
karena mengacu pada performa produksi aktual.
Kata kunci: decline curve, forecasting, jj arps, splitting produksi
vi
ABSTRACT
ANALYSIS OF PRODUCTION ALLOCATION SPLITTING AND
REMAINING OIL RESERVES ESTIMATION IN THE “ZR”
FIELD
By
Farhan Zhahir Rachman
NIM: 113210062
(Petroleum Engineering Undergraduate Program)
The ZR Field is one of the oil fields currently in the late production phase and
experiencing a decline in production rates due to decreasing reservoir pressure.
This field employs commingled completions, in which several reservoir layers are
produced simultaneously without separating the production rates of each layer.
This condition poses challenges in evaluating remaining oil reserves because the
contribution of each sub-layer cannot be directly measured.
This study aims to estimate the remaining oil reserves in the ZR Field using two
methods: the JJ Arps correlation method based on the classification of reservoir
drive mechanisms, and the Decline Curve Analysis (DCA) method utilizing
historical production data. A production splitting approach was applied to allocate
oil production to each sub-layer by considering petrophysical parameters such as
kh(1−Sw), enabling more accurate reserve estimation in each productive interval.
The results of the production allocation splitting show that the F-5B sub-layer has
the highest production contribution to the total field production, while the F-3B
sub-layer has the lowest contribution. The JJ Arps method yielded an estimated
ultimate recovery (EUR) of 54.37 MMSTB and remaining reserves of 8.67 MMSTB,
whereas the DCA method produced an EUR of 46.58 MMSTB and remaining
reserves of 0.89 MMSTB. Furthermore, DCA forecasting indicated that production
from several layers could continue for more than 20 years. The comparison between
the two methods resulted in a remaining reserve difference of 7.79 MMSTB. This
significant discrepancy shows that the JJ Arps method tends to produce higher
estimates as it is based on ideal reservoir conditions, while the DCA method
provides more conservative and realistic results as it reflects the actual production
performance.
Keywords: decline curve, forecasting, jj arps, production splitting
vii

Item Type:	Tugas Akhir (Skripsi)
Uncontrolled Keywords:	decline curve, forecasting, jj arps, production splitting
Subjek:	T Technology > T Technology (General)
Divisions:	Fakultas Teknologi Mineral dan Energi > (S1) Teknik Perminyakan
Depositing User:	Eko Yuli
Date Deposited:	10 Oct 2025 02:02
Last Modified:	10 Oct 2025 02:02
URI:	http://eprints.upnyk.ac.id/id/eprint/44211

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