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MAC. Endharto
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
Chemical Engineering, Chemistry & Bioengineering Energy

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THE SHOREFACE - FAIRWEATHER WAVE BASE ENVIRONMENT OF THE MIDMIOCENE SANDSTONE IN THE CENTRAL PART OF THE MADURA ISLAND MAC. Endharto
Scientific Contributions Oil and Gas Vol 29 No 1 (2006)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.29.1.1021

Abstract

As mentioned in the previous paper (Endharto, 2005) this paper is part of the series of the depositional model of the Ngrayong Sandstone, which takes part especially in the central part of the Madura Island. This study also examines physical evidence of the best exposure of the study area. The central part is located between 07 01' 18" S - 113 32' 56" E and 07 04' 55" S- 113 36' 54" E, covering the area of Tanjung - Pasean to the north and Mentok - Kertengeneh - Sentol to the south. (Figure 1). The Geological work was carried out during June - July 2005, where the particular attention was concentrated within the central region of the island. There are 3 major key outcrop areas were studied and assigned for the depositional setting of this area (i.e., Tanjung toward Pasean River, Mentok - Kertengeneh Oil Field and Sentol Daya sections). This worked has attempted to sort it out both vertical and horizontal sections with applying the stratigraphic measuring sections (outcrop/surface logs), horizontal distance using passing compass, supported by petrography and paleontology analysis, and trying to look at the internal sedimentological structures to get into broadly image of the depositional system within this area.
THE PALAEOENVIRONMENTS AND DEPOSITIONAL MODEL FOR THE NGRAYONG SANDSTONES AN OUTCROP STUDY IN EASTERN PART OF THE MADURA ISLAND AS A REFERENCE MAC. Endharto
Scientific Contributions Oil and Gas Vol 29 No 2 (2006)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.29.2.1025

Abstract

This topic is the most eastern portion of the se- ries depositional model of the Ngrayong Sandstone, which well develops particularly in Madura Island. This study is also observing both vertical and horizontal sequences of the sedintentological aspects and its geological associations of the Ngrayong Sandstone outcrops. The eastern part is situated between 06° 58' 10" S- 113° 46' 16" E and 06 59' 47" S- 113° 56' 09" E, that covers the eastern studies area ie, Mandala --Belukares and Prenduan to the west and Banjar Barat – Gapura - Sema to the eastern margin (Fig- ure 1). These areas are also exemplifying the east- ern most of the Ngrayong Sandstone depositional setting. Like most of the previous Ngrayong Sandstone Studies of these series is to consign the sand- stone deposition aspects especially in the main land of Madura to obtain good affiliation within the basin configuration related to hydrocarbon exploration in this region. The worked was converged on the Ngrayong Sandstone exposures to investigate the depositional style of the sandstone in the eastern portion of the island. The data mostly obtained from direct measurement of even single section of the outcrop, paleocurrent analysis and sedimentary structure, collecting the rock samples for petrographic study to see the modal analysis, di- agenesis, and reservoir characteristic.
STRATIGRAPHY, TECTONICSAND MAJOR SEQUENCE BOUNDARY DEVELOPMENT IN TERTIARY SEDIMENTS OF CENTRAL SUMATRA BASIN Ukat Sukanta; Mac. Endharto
Scientific Contributions Oil and Gas Vol 28 No 3 (2005)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.28.3.1043

Abstract

According to Satrio and Soejanto (1994), the CPI contract area of Central Sumatra basin has discovered more than 130 fields, and most of these fields are structural traps. The basin is a NW - SE trending elongate depression, which is bounded in the north- west by the Asahan Arc and in the southeast by the Tigapuluh High. To the West, it is bounded by the northwest – southeast trending Barisan Mountains, whereas to the northeast by the Strait of Malacca (Figure 1). The Central Sumatra Basin is based by the Pretertiary basement rocks and has been filled by Eocene up to the Plio-Pleistocene siliciclastic-dominated strata. Based on a three year consulting work for the CPI and discussion with many Earth Scientists of this company, and being supported by much information on the related data from published reports, the senior author has been able to propose scientific contribution on the stratigraphy of the basin and its relationships with tectonism and sea level changes.
Co-Authors Ukat Sukanta