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Agus Mochamad Ramdhan
Faculty of Earth Sciences and Technology, Institut Teknologi Bandung (ITB)
Earth & Planetary Sciences Energy Engineering

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Journal : Bulletin of Geology

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ANALISIS MEKANISME TERJADINYA TEKANAN-LUAP DAN PREDIKSI TEKANAN PORI PADA LAPANGAN BD, CEKUNGAN JAWA TIMUR Ryan Surjaudaja; Agus Mochamad Ramdhan; Indra Gunawan
Bulletin of Geology Vol 1 No 2 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.2.2

Abstract

The East Java Basin is one of the sedimentary basins with proven petroleum system and very prospective as an exploration target. However, drilling in this basin is a risky operation because of the presence of overpressure, which is shown by kick and lost during exploration wells drilling in BD Field as an example. Drilling problems and drilling risks can be reduced by doing overpressure study, including overpressure generating mechanism, pore pressure prediction, and estimation top of overpressure. The temperature in this field can reach 80°C at the depth around 1500 m SSTVD. However, the Dutta-Katahara crossplot does not indicate any diagenesis of smectite to illite. It is also confimed by XRD data in one of the well, which shown domination of kaolinitic clay mineral. Based on the vitrinite reflectance data, there is no transformation of kerogene to hydrocarbon in this field. The burial history plot shows rapid sedimentation with the rate of 1723 m/million years. Based on those criterias, the main overpressure generating mechanism is interpreted to be loading mechanism. High sedimentation rate is related to the peak inversion in Plio-Pleistocene time, providing abundant of sediment supply into the basin. Pore pressure in this field can be estimated by using sonic data with Eaton’s method. Both direct and indirect pressure measurements, combine with drilling data are used to support this estimation. Based on well data, top of overpressure in this field is located at the depth around 1500-1600 m SSTVD. The top of overpressure is located within Lidah Formation.
PREDIKSI TEKANAN PORI DENGAN DATA SEISMIK 3D DAN DATA LOG SUMUR MENGGUNAKAN METODE EATON (STUDI KASUS DI CEKUNGAN BONAPARTE UTARA) Tatang Juhatta; Agus Mochamad Ramdhan; Fatkhan Fatkhan
Bulletin of Geology Vol 1 No 2 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.2.4

Abstract

Pore pressure prediction has important implications in determining the success of drilling activities. This thesis discusses pore pressure prediction in the northern Bonaparte Basin using wireline log data and 3D seismic interval velocity. The Eaton method is used to predict pore pressure in wells and to construct 3D model of pore pressure. Eaton method is used for pore pressure prediction, overpressure mechanism in the well and 3D model of pore pressure. Pore pressure prediction is determined by effective stress value that is obtained by the analysis of interval check-shot velocity, hydrostatic pressure is assumed to follow the gradient of 0.43 psi/ft and overburden pressure is obtained from density log data. Pore pressure prediction in 3D model is determined from 3D model of effective stress that is generated from average NCT of interval velocity of each well, the hydrostatic pressure is assumed to follow the gradient of 0.43 psi/ft and 3D model of pressure overburden generated from the 3D model density that is obtained from model 3D interval velocity by the result of Gardner transformation. The analyses of pore pressure in the well and 3D model indicate that overpressure occurs in Wangarlu Formation at the depth interval of 2000-2300 m, then it gradually reaches hydrostatic pressure in the Plover Fm. at the depth interval of 3750-3900m. Overpressure is generated by disequilibrium compaction meaning that sediments fail to compact because the expulsion of pore water is inhibited. Compression tectonic activity that occurred in the late Miocene in the north, probably contributes to increase in lateral stress that produces overpressure that spreading laterally to the south of the study area. The results of this study can be applied in the planning of drilling wells including casing design and estimation of mud weight in each depth interval that will be used during drilling.
METODE SEISMIC PORE PRESSURE UNTUK PENYEBARAN TEKANAN LUAP DI BLOK ARU, CEKUNGAN SUMATRA UTARA Jihan Cessar H. Gurning; Agus Mochamad Ramdhan
Bulletin of Geology Vol 1 No 2 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.2.5

Abstract

The North Sumatra Basin is one of the Tertiary back-arc basins which has been explored since the colonial era. The existence of overpressured zone has already been recognized. This is due to the existence of shale or claystone sequence that is capable to generate overpressure condition. Therefore, the understanding and knowledge of pore pressure and the mud weight used to counter the pressure are of paramount importance. The approach used to define pore pressure value with Eaton empirical method is generally done on wells only. In this research, determination of lateral pore pressure distribution is done with the seismic image and seismic interval velocity data. Wireline log and seismic interval velocity data are both being integrated to generate the pore pressure estimation and the distribution of overpressured zone in the North Sumatra Basin. The overpressure in this research area is caused by non-loading mechanism with the transformation of smectite into illite. The top of overpressure generally follows stratigraphic layer and sometimes it crosses the stratigraphic layer.
Co-Authors Fatkhan Fatkhan Indra Gunawan Jihan Cessar H. Gurning Ryan Surjaudaja Tatang Juhatta