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Petroleum Systems in Jatibarang

The document summarizes the petroleum systems in the Jatibarang Sub-Basin in Northwest Java, Indonesia. Lower Talang Akar Formation shales serve as the source rock, while Upper Talang Akar and Upper Cibulakan formations contain sandstone and limestone reservoirs. The Batu Raja Limestone within the area has good porosity and could result in sizable hydrocarbon accumulations. Normal faults control the stratigraphy and provided migration pathways for hydrocarbons from the Early Oligocene to Late Miocene source and reservoir rocks. The paper characterizes the sub-basin's petroleum system in terms of source rock type, migration, major reservoir and seal units, and hydrocarbon entrapment

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85 views1 page

Petroleum Systems in Jatibarang

The document summarizes the petroleum systems in the Jatibarang Sub-Basin in Northwest Java, Indonesia. Lower Talang Akar Formation shales serve as the source rock, while Upper Talang Akar and Upper Cibulakan formations contain sandstone and limestone reservoirs. The Batu Raja Limestone within the area has good porosity and could result in sizable hydrocarbon accumulations. Normal faults control the stratigraphy and provided migration pathways for hydrocarbons from the Early Oligocene to Late Miocene source and reservoir rocks. The paper characterizes the sub-basin's petroleum system in terms of source rock type, migration, major reservoir and seal units, and hydrocarbon entrapment

Uploaded by

Aldi Yudasaputra
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© © All Rights Reserved
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The Understanding of Petroleum Systems in Jatibarang

Sub-Basin on North West Java Indonesia

Naufal Juliandre Munandar(1), Aldi Yudasaputra, S.T.(2), Ir. Nurdrajat, M.T.(3)


Faculty of Geological Engineering, Universitas Padjadjaran , Indonesia

Abstract
Oil and Gas exploration and exploitation in the West Java Province have been prolific
until today. Many concept between conventional and unconventional have been applied to
develop this area. One of the steps that can be considered as a play concept was based on
manifestation on oil seepages and geological surface mapping.
Based on rock sample from geological surface mapping, the sediments identification
in petrography analysis can be classified: shales as sourcerock from Lower Talang Akar
Formation, sandstone and limestones as reservoirs from Upper Talang Akar and Upper
Cibulakan. In this area where the Batu Raja Limestone has a good porosity, sizeable
accumulation may result. Then according to the paleontology analysis including polen and
foraminifera, depositional environtment can be define as fluvial deltaic and shallow marine
type.
The basin of North West Java is a coastal area elongated in the E-W direction with an
approximate width of 60-70 km. It is bordered to the South by the Java geanticline and in the
North extends to the Sunda shelf under the shallow Java sea. The Jatibarang sub-basin is
located in the eastern part of the North West Java Basin. It is well known as a prolific area for
hydrocarbon, producing oil and gas from Early-Oligocene to Late-Miocene reservoirs. The
sub-basin was formed in the Early Tertiary and grew as part of the North West Java Back-Arc
Basin. The early development of the sub-basin, started with formation of a half-graben
generated by the active back-arc tensional systems. It then was filled by Tertiary sediments.
The occurence of hydrocarbon in the Jatibarang sub-basin according to the stratigraphy from
the oldest to the youngest formation is as follows: Jatibarang, Talang Akar, Baturaja, Upper
Cibulakan, Parigi, and Cisubuh, then their formations were controlled by the existing normal
fault which provided vertical migration pathways for hydrocarbon.
In this paper, petroleum systems in Jatibarang Sub-Basin on North West Java have
been characterized in term of the type of source rock, migration, major reservoir and seal
unit, and style of entrapment.
Keywords: Petroleum System, Jatibarang, Sub-Basin, Surface Mapping.

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