EVALUASI DATA MUD LOGGING DAN WELLSITE GEOLOGY UNTUK IDENTIFIKASI GEOTHERMAL FEED ZONE PADA PEMBORAN SUMUR DUG-L6, LAPANGAN GEA, SUMATERA SELATAN.

GEA, HARMAIN SAKA (2025) EVALUASI DATA MUD LOGGING DAN WELLSITE GEOLOGY UNTUK IDENTIFIKASI GEOTHERMAL FEED ZONE PADA PEMBORAN SUMUR DUG-L6, LAPANGAN GEA, SUMATERA SELATAN. Tesis thesis, UPN Veteran Yogyakarta.

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Abstract

RINGKASAN
EVALUASI DATA MUD LOGGING DAN WELLSITE GEOLOGY
UNTUK IDENTIFIKASI GEOTHERMAL FEED ZONE PADA
PEMBORAN SUMUR DUG-L6, LAPANGAN GEA, SUMATERA
SELATAN.
Penelitian ini bertujuan untuk mengidentifikasi zona produktif pada sumur
panas bumi DUG-L6, Lapangan Gea, Sumatera Selatan, melalui integrasi data real
time selama pemboran berarah. Analisis difokuskan pada dua trayek lubang, yaitu
12¼” (1300–1790 mMD) dan 9⅞” (1790–2593 mMD), dengan menggunakan data
dari Mud Logging Unit (MLU), deskripsi cutting, parameter teknis pemboran, serta
respon formasi terhadap fluida sirkulasi. Indikator utama yang digunakan meliputi
anomali drilling break, kehilangan sirkulasi lumpur, anomali temperatur BHCT,
serta keberadaan mineral alterasi hidrotermal.
Hasil menunjukkan tiga kejadian drilling break signifikan pada kedalaman
1388–1389.7 mMD, 1667–1669 mMD, dan 2495.7–2497 mMD, yang ditandai
dengan peningkatan tajam ROP, penurunan WOB, dan anomali suhu permukaan.
Nilai BHCT melebihi ambang 55°C tercatat selama sirkulasi aktif pada interval
1300–1355 mMD (maksimum 63,4°C) dan 2300–2593 mMD (maksimum 60,6°C),
disertai dengan kejadian kehilangan sirkulasi total (TLC). Evaluasi cutting pada
interval 1300–1355 mMD mengidentifikasi litologi Dacite Lithic Tuff dengan
mineral alterasi illite dan chlorite, serta nilai MeB sebesar 4–5 yang
mengindikasikan zona transisi menuju zona permeabel.
Dua interval, yakni 1300–1355 mMD dan 2300–2593 mMD, memenuhi
minimal tiga dari empat kriteria validasi zona feed, meliputi drilling break, TLC,
anomali BHCT, dan mineral hidrotermal. Temuan ini menunjukkan bahwa integrasi
data mud logging dan observasi geologi sumur mampu mengidentifikasi zona
reservoir secara akurat selama pemboran. Metode ini terbukti efektif sebagai dasar
pengambilan keputusan teknis secara real-time pada pemboran panas bumi.
Kata kunci: Geothermal, zona feed, mud logging, drilling break, BHCT, DUG-L6,
Sumatera Selatan.
vii
ABSTRACT
EVALUATION OF MUD LOGGING AND WELLSITE GEOLOGY DATA
FOR THE IDENTIFICATION OF GEOTHERMAL FEED ZONES IN THE
DRILLING OF WELL DUG-L6, GEA FIELD, SOUTH SUMATRA.
This study aims to identify productive zones in the DUG-L6 geothermal
well, Gea Field, South Sumatra, by integrating real-time drilling data and
geological observations during directional drilling. The analysis focuses on two
borehole sections, 12¼” (1300–1790 mMD) and 9⅞” (1790–2593 mMD), using
data from Mud Logging Unit (MLU), cutting descriptions, drilling parameters, and
formation responses. Key indicators used include drilling break anomalies, mud
losses, temperature anomalies (BHCT), and the presence of hydrothermal
alteration minerals.
Results show three major drilling breaks at 1388–1389.7 mMD, 1667–1669
mMD, and 2495.7–2497 mMD, which coincide with sharp ROP increases, WOB
reductions, and surface thermal anomalies. BHCT values exceeding 55°C were
recorded during circulation at 1300–1355 mMD (peak 63.4°C) and 2300–2593
mMD (peak 60.6°C), accompanied by total and partial mud losses. Evaluation of
cuttings in the 1300–1355 mMD interval revealed Dacite Lithic Tuff lithology with
moderate to strong chlorite and illite alteration, supported by MeB values of 4–5,
indicating transition from a sealing zone to a permeable feed zone.
Two zones—1300–1355 mMD and 2300–2593 mMD—meet at least three of
four validation criteria: drilling break, circulation loss, BHCT anomaly, and
hydrothermal mineral indicators. These findings demonstrate that the integration
of mud logging and geological wellsite data can effectively identify geothermal
reservoir zones in real-time, eliminating the need for post-drilling datasets such as
wireline logging or PTS. The methodology provides a reliable, early assessment
tool for geothermal drilling decision-making.
Keywords: geothermal drilling, mud logging, wellsite geologist, feed zone,
hydrothermal alteration, directional well, formation evaluation
viii

Item Type:	Tugas Akhir (Tesis)
Subjek:	T Technology > T Technology (General)
Divisions:	Fakultas Teknologi Mineral dan Energi > (S2) Magister Teknik Perminyakan
Depositing User:	Eko Yuli
Date Deposited:	21 Oct 2025 02:55
Last Modified:	21 Oct 2025 02:55
URI:	http://eprints.upnyk.ac.id/id/eprint/44635

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