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AAPG Bulletin

Abstract

AAPG Bulletin, V. 99, No. 11 (November 2015), PP. 20052022

Copyright copy2015. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/06191514050

Source Previous HitrockNext Hit facies distribution predicted from Previous HitoilNext Hit geochemistry in the Central Sumatra Basin, Indonesia

Norelis D. Rodriguez1 and R. Paul Philp2

1Chevron Energy Technology Company, 1500 Louisiana Street, Houston, Texas; ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma; [email protected]
2ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma; [email protected]

ABSTRACT

The molecular and compound-specific isotopic composition of the n-alkanes in 30 Previous HitoilNext Hit samples from the Central Sumatra Basin were analyzed with the purpose of determining facies variations of the source Previous HitrockNext Hit in this basin. The Previous HitoilNext Hit samples were generated by the Eocene-Oligocene lacustrine Brown Shale Formation. Biomarkers in the Previous HitoilNext Hit samples indicate varying contributions from algal and terrigenous organic matter, primarily under oxic, or suboxic depositional conditions. Five source Previous HitrockNext Hit facies were identified based on the relative concentrations of n-alkanes, isoprenoids, tricyclic terpanes, and steranes. The individual facies were also distinguished by the compound-specific isotopic composition of the n-alkanes. Source Previous HitrockTop depositional environments vary from deep lacustrine, shallow lacustrine, and lacustrine saline to coal and mixed coal and lacustrine shale. Deep lacustrine facies predominate in the Aman and Bengkalis troughs whereas saline and shallow lacustrine facies predominate in the South Aman and Kiri troughs, respectively. Oils derived from coal and mixed coal and lacustrine shale facies predominate in the northern part of the Central Sumatra Basin, in the Tanjung Medan and north of the Balam grabens.

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