GEOLOGI DAN PENENTUAN PROSPEK HIDROKARBON BERDASARKAN ANALISIS PETROFISIKA PADA FORMASI WONOCOLO, BULU, DAN NGRAYONG, LAPANGAN ALF, CEKUNGAN JAWA TIMUR UTARA

Fitri Alquddus, Muhammad Idul (2023) GEOLOGI DAN PENENTUAN PROSPEK HIDROKARBON BERDASARKAN ANALISIS PETROFISIKA PADA FORMASI WONOCOLO, BULU, DAN NGRAYONG, LAPANGAN ALF, CEKUNGAN JAWA TIMUR UTARA. Other thesis, UPN "Veteran" Yogyajarta.

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Abstract

iii
SARI
Menurut Pringgoprawiro 1983 Disebutkan bahwa pada cekungan Jawa Timur Utara terutama pada
Formasi Ngrayong, dan Bulu memiliki kelimpahan hidrokarbon yang baik, maka dari itu penulis
melakukan penelitian untuk membuktikan keberadaan reservoir pada Formasi Ngrayong, Bulu, dan
Wonocolo.
Metode dalam penelitian ini yang digunakan untuk menganalisis kondisi geologi secara kualitatif
dan kondisi hidrokarbon menggunakan Analisis Petrofisika, yang dapat mengoptimalkan produktivitas
suatu Sumur dan mengenal karakteristik reservoirnya. Analisis ini dilakukan menggunakan data
wireline log yang divalidasi oleh dara routine core analisis, well report dan data mud log. Analisis
kualitatif dilakukan dengan mengidentifikasi litologi, menentukan marker sikuen stratigrafi, sistem
track, menentukan fasies sampai lingkungan pengendapan. Sedangkan analisis kuantitatif dengan
mengetahui properti petrofisika melalui perhitungan volume clay, prositas, saturasi air, dan
permeabilitas. kemudia dilakukan cut-off sampai didapatkan zona hidrokarbon.
Berdasarkan analisis kualitatif, didapatkan litologi berupa batupasir, batugamping berupa
wackstone-packstone, dan batuserpih. Pada lapisan pengamatan K1, L3 dan L5 merupakan batugamping
berupa wackstone-packstone. Pada Sumur pengamtan pengendapan dengan sistem regresi dan transgresi
berupa HST dan TST dengan marker sikuen SB dan MFS. Pada Sumur pengamatan didapatkan fasies
berupa calcalreous sand stone channel facies, interlaminated shale & sand facies, laminated shale and
sand facies, dan detrital limestone facies yang terendapkan pada lingkungan tidal channel, tidal flat,
lagoon, dan offshore bar. Pada lapisan pengamatan fasies berupa detrital limestone facies dengan
lingkungan pengendapan offshore bar (Selley, 198). Berdasarkan analisi kuantitatif, didapatkan
paremter petrofisika dengan nilai akhir dari permeabilitas sebesar 8,3 yang dilihat dari klasifikasi
Koesoemadinata, 1980 yang artinya baik/good. Sedangkan pada nilai cut-off porositasnya sebesar 19%,
15%, 14%, 11%, 15%, 13%, 23% dan 16%. Nilai volume shale sebesar 0.01, 0.02, 0.04, 0.08, dan 0.05
serta nilai water satuartion sebesar 0.7, 0.5, 0.6 yang menunjukan lapisan tersebut terisi oleh
hidrokarbon. Dan didapatkan juga kesimpulan dari zona prospek hidrokabron antara lain, Pada Sumur
ALF-1 lapisan K1 memiliki kedalaman 1478.27-1493.21 ft dengan ketebalan gross sebesar 14.94 ft dan
ketebalan net pay sebesar 14,25 ft. Pada lapisan L3 memiliki kedalaman 1658.25-1694.83 ft dengan
ketebalan gross sebesar 36.58 ft dan ketebalan net pay sebesar 14.33 ft. Pada lapisan L5 memiliki
kedalaman 1754.88-1764.02 ft dengan ketebalan gross sebesar 9.14 ft dan ketebalan net pay sebesar
5.87 ft. Pada Sumur ALF-2 lapisan K1 memiliki interval kedalaman 1646.7-1672.58 ft dengan ketebalan
gross sebesar 25.6 ft dan ketebalan net pay sebesar 2.97 ft. Pada lapisan L3 memiliki interval kedalaman
1825.9-1867.2 ft dengan ketebalan gross sebesar 41.3 ft, dan ketebalan net pay sebesar 15.54 ft. Pada
lapisan L5 memiliki interval kedalaman 1920.54-1928.92 ft dengan ketebalan gross sebesar 8.38 ft, dan
ketebalan net pay sebesar 3.15 ft. Pada Sumur ALF-3 lapisan K1 memiliki interval kedalaman 1586.8-
1616.8 ft dengan ketebalan gross sebesar 29.28 ft dan ketebalan net pay sebesar 22.56 ft. Pada lapisan
L5 memiliki interval kedalaman 1885.36-1902 ft dengan ketebalan gross sebesar 16.64 ft, dan ketebalan
net pay sebesar 15.44 ft. Sehingga pada Sumur pengamatan dikategorikan lapangan yang produktif
untuk dilakukan eksplorasi lebih lanjut.
Kata Kunci: Analisis Kualitatif, Petrofisika, Formasi Ngrayong Bulu dan Wonocolo, Cekungn Jawa
Timur Utara
iv
ABSTRACT
According to Pringgoprawiro 1983, it was stated that in the North East Java basin, especially in
the Ngrayong Formation, and Bulu Formations have good corrosion, therefore the authors conducted
a study to prove the existence of reservoirs in the Ngrayong, Bulu, and Wonocolo Formations.
The method in this study used to qualitatively analyze geological conditions and carbon conditions
using Petrophysical Analysis, which can optimize the productivity of a well and identify reservoir
features. This analysis was performed using wireline log data which was validated by routine core
analysis, well reports and mud log data. Qualitative analysis was carried out by identifying lithology,
determining sequence stratigraphic markers, system paths, determining facies to depositional
environments. While the quantitative analysis by knowing the petrophysical properties through the
calculation of clay volume, porosity, air saturation, and permeability. then cut-off is done to get the
carbonate zone.
Based on the qualitative analysis, the lithology is sandstone, limestone is wackstone-packstone, and
shale. In the observation layers K1, L3 and L5 are limestones in the form of wackstone-packstone. In
the depositional observation wells with a regression and transgression system in the form of HST and
TST with SB and MFS sequence markers. In the observation well, the facies were found in the form of
calcareous sandstone channel facies, shale & interlaminated sand facies, layered shale facies, and
detrital limestone facies deposited in tidal channel, tidal flat, lagoon, and offshore bar environments.
The facies observation layer is a detrital limestone facies with an offshore bar depositional environment
(Selley, 198). Based on the quantitative analysis, obtained petrophysical parameters with a final value
of permeability of 8.3 as seen from the Koesoemadinata classification, 1980 which means good.
Meanwhile, the porosity cut-off values are 19%, 15%, 14%, 11%, 15%, 13%, 23% and 16%. Shale
volume values of 0.01, 0.02, 0.04, 0.08, and 0.05 and water saturation values of 0.7, 0.5, 0.6 which clog
the layers with water. And also the conclusions from the hydrocarbon prospect zone, among others, in
the ALF-1 Well the K1 layer has a depth of 1478.27-1493.21 ft with a gross thickness of 14.94 ft and a
net pay thickness of 14.25 ft. The L3 layer has a depth of 1658.25-1694.83 ft with a gross thickness of
36.58 ft and a net pay thickness of 14.33 ft. The L5 layer has a depth of 1754.88-1764.02 ft with a gross
thickness of 9.14 ft and a net pay thickness of 5.87 ft. In the ALF-2 well, the K1 layer has a depth interval
of 1646.7-1672.58 ft with a gross thickness of 25.6 ft and a net pay thickness of 2.97 ft. The L3 layer has
a depth interval of 1825.9-1867.2 ft with a gross thickness of 41.3 ft, and a net pay thickness of 15.54
ft. The L5 layer has a depth interval of 1920.54-1928.92 ft with a gross thickness of 8.38 ft, and a net
pay thickness of 3.15 ft. In the ALF-3 well, the K1 layer has a depth interval of 1586.8-1616.8 ft with a
gross thickness of 29.28 ft and a net pay thickness of 22.56 ft. The L5 layer has a depth interval of
1885.36-1902 ft with a gross thickness of 16.64 ft, and a net pay thickness of 15.44 ft. So that in the
observation of wells observing productive fields for further exploration.
Keywords: Qualitative Analysis, Petrophysics, Ngrayong Bulu and Wonocolo Formations, North East
Java Basin

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Qualitative Analysis, Petrophysics, Ngrayong Bulu and Wonocolo Formations, North East Java Basin
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Eko Yuli
Date Deposited:	21 Aug 2023 04:11
Last Modified:	21 Aug 2023 04:11
URI:	http://eprints.upnyk.ac.id/id/eprint/37006

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