Muhamad Iqbal, . (2025) PENENTUAN ZONA ABNORMAL PRESSURE MENGGUNAKAN PENDEKATAN PORE PRESSURE FRACTURE GRADIENT DAN ANALISIS FASIES BERDASARKAN DATA SUMUR DI LAPANGAN “BALE”, FORMASI PARIGI DAN CIBULAKAN ATAS, CEKUNGAN JAWA BARAT UTARA. Skripsi thesis, Universitas Pembangunan Nasional Veteran Yogyakarta.
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Abstract
The frequent occurrence of loss circulation during drilling activities in the Bale
Field indicates the need for a comprehensive understanding of the presence of
abnormal pressure in the subsurface. This study aims to estimate the Pore Pressure
Fracture Gradient (PPFG) using the Eaton method based on resistivity logs to
support drilling risk mitigation, such as identifying weak zones. The abnormal
pressure analysis was conducted with the assistance of Excel software. The
estimation began with the calculation of the overburden gradient, the determination
of shale points, and the establishment of the normal compaction trend (NCT) as the
basis for pore pressure prediction. Rock geomechanical parameters, such as
Poisson’s ratio, were calculated using the RHOB Gardner equation through the
Vp/Vs ratio (difference between P- and S-wave velocities), with density logs as an
alternative due to the unavailability of sonic log data. The interpretation results
indicate that abnormal pressure in the Bale Field is characterized by underpressure
caused by heat decrease, controlled by a normal fault regime, based on the stress
regime classification of Anderson (1951) with the relationship OBG > Shmax >
Shmin. The distribution of weak zones observed on the fracture gradient map shows
a northeast–southwest trend, thus safe drilling recommendations include avoiding
this trend. In addition, facies analysis results indicate that the depositional
environment allowed the formation of limestone, which has a direct influence on
the development of underpressure.
| Item Type: | Tugas Akhir (Skripsi) |
|---|---|
| Additional Information: | Muhamad Iqbal (Penulis-111210042); Muhamad Syaifuddin (Pembimbing) |
| Uncontrolled Keywords: | Abnormal pressure, metode Eaton, pore pressure fracture gradient, sesar normal, underpressure. |
| Subjek: | Q Science > QE Geology |
| Divisions: | Fakultas Teknologi Mineral dan Energi > (S1) Teknik Geologi |
| Depositing User: | Bayu Pambudi |
| Date Deposited: | 10 Feb 2026 02:05 |
| Last Modified: | 10 Feb 2026 02:05 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/47010 |
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