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Prospect Basin with Proven Petroleum System
Basin Status
Rifting Valley Foreland
Tectonic Setting
0
Area (km2)
0
Visitor Count
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Prospectivity & Resources of
Bone Basin

Basin Capacity
Data based on 26 May 2024

Oil 21600
MMBO
(Million Barrels of Oil)
Gas N/A
TCF
(Trillion Cubic Feet)

Resources
Data based on 26 May 2024

Oil
Conventional
239.79
MMBO
(Million Barrels of Oil)
Gas
Conventional
1.16
TCF
(Trillion Cubic Feet)
Oil
Unconventional
N/A
MMBO
(Million Barrels of Oil)
Gas
Unconventional
N/A
TCF
(Trillion Cubic Feet)

Executive Summary of
Bone Basin

Description

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Version
1
Published Date
14 Sep 2022
Uploaded Date
24 Jul 2023
Photos Some footage of Bone Basin
Introduction Preliminary details of Bone Basin
Sulawesi or Celebes is located in the central part of the Indonesian archipelago with an area of ​​174,600 square km. The shape is unique or resembles the letter K with four peninsulas with east, northeast, southeast and south directions. Sulawesi is bordered by the Makassar Strait in the west, the Sulawesi Sea in the north, Flores in the south, Timor in the southeast and Maluku in the east.
Data based on: 14 Sep 2022
Exploration History Detailed history of Bone Basin

The history of exploration in this basin started from 1909 and 1915 (Abendanon, 1915) conducted a geological survey and found indications of an active petroleum system in the form of hydrocarbon seepage in the Parandean area and the West Coast of Doda (Lariang Sub-basin). In 1918, further field studies were carried out by Reyzer which was published in the form of the first geological map in Indonesia which mapped the geology of the entire South Sulawesi region.

This geological map also confirms the presence of hydrocarbon seeps in the Kira-Pandean, Emba-Enrekang, Sadang River, Bua Kayu areas, the presence of Eocene coal in the Randanon-Makale and Banti areas, as well as on the banks of the Karama River to the north. Furthermore, in 1930 to 1931 exploration was continued by a Dutch limited company named BPM (Bataafsche Petroleum Maatschappij) which found hydrocarbon seeps in pyroclastic rocks in the Jambu area, southeast of Enrekang.

Exploration was resumed in 1970 through Gulf Oil ltd and in 1971 the BBA-1X well was drilled in Bone Bay to test the closure prognosis on the eastern fold flank, faulted anticlines and evaluation of rock formations of Tertiary to Late Mesozoic age. The drilling results are still far from the target of the Malawa Formation and the Tonasa Formation so that the wells are closed and abandoned. In 1974 BP Petroleum Development explored the Sengkang and Kampung Baru areas to carry out four exploration drillings and found hydrocarbons that had developed into the Walangan and Kampung Baru gas fields. In 1976, Gulf Oil explored and drilled the Bonge-1 well and found minor gas accumulations.

Drilling was continued for the next three wells in 1980 at the Walanga and Kampung Baru fields. Then in 1991, Energy Equity ltd became the operator by buying blocks owned by Gulf Oil and BP and Energy Equity started production by developing the Kampung Baru-Walanga and Sampi-sampi gas fields in 1997. Exploration in this basin was still continuing in 2007 through PT TGS with speculative seismic methods and the last survey was conducted by PPGL in 2011 with conventional seismic methods.

Data based on: 14 Sep 2022
Regional Geology Detailed regional geology of Bone Basin

Sulawesi and its surroundings is a complex area because it is the confluence of three large plates, namely the Indo-Australian Plate which moves north-northeast, the Pacific Plate which moves west-northwest and the Eurasian Plate which moves almost statically or very slowly towards the north-east, south-southeast (Hamilton, 1979; Hutchison, 1989) and a smaller plate, the Philippine Plate.

The collision process of the four plates causes the island of Sulawesi to have four arms with different tectonic processes to form a geological mosaic. This island seems to be torn apart by various faults such as the Palu-Koro Fault, Poso Fault, Matano Fault, Lawanopo Fault, Walanae Fault, Gorontalo Fault, Batui Fault, Tolo Fault, Makassar Fault and others, where various types of rocks mix so that the stratigraphic position is difficult to determine.

In the northern part of Sulawesi Island there is the North Sulawesi Trench which was formed by subduction of oceanic crust from the Sulawesi Sea, while in the southeast there is the Tolo Fault which is a subduction between the southeast arm of Sulawesi Island and the western part of the Banda Sea, where the two structures are connected by the Palu-Koro Fault and Matano Fault.

Data based on: 14 Sep 2022
Petroleum System Detailed petroleum system of Bone Basin

Based on the results of geochemical analysis from field data collection and laboratory results, interpretation of BBA-1X well data, interpretation of pseudo-wells in the Bone basin, it was found that the rock that has the potential as source rock is the Malawa or Toraja Formation in the form of Eocene black carbonate shale with an average TOC.

The average is 11 percent and the coal at the bottom of the Tonasa Formation is Oligocene with an average TOC of 33 percent with kerogen type III (vitrinite). Reservoir rocks in the Bone Basin are sandstones of the Malawa or Toraja Formation of Middle-Late Eocene age, Tonasa Formation consisting of Late Eocene-Middle Miocene limestone, and Late Miocene Walanae Formation sandstone.

The rocks that act as insulating rocks are the Walanae Formation shale, the upper shale members of the Camba Formation and Bone Formation, and the upper shale of the Toraja Formation. The trap pattern that developed in this basin is tilted fault blocks formed in the Middle Eocene age and sedimentary drapes above the pinnacle reef. Also found combination traps between lateral pinch-outs and tilted fault blocks in shallow deposits along the western boundary of the Bone Basin. The estimated reserves based on the 50 percent of probability calculation are 239.79 MMBO with the oil scenario and 1.15727 TCF with the natural gas scenario.

Data based on: 14 Sep 2022
Resources Detailed resources of Bone Basin
Data based on: 14 Sep 2022

Petroleum System Chart of
Bone Basin

Description

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Version
1
Published Date
20 Sep 2022
Uploaded Date
20 Jun 2023
Petroleum System Chart Petroleum system chart to Bone Basin

Montage of
Bone Basin

Description

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Version
1
Published Date
14 Sep 2022
Uploaded Date
20 Jul 2023
Montage Detailed montage of Bone Basin

Reports & Publications of
Bone Basin

Description

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1
Published Date
-
Uploaded Date
20 Jun 2023
Reports & Publications PDF The PDF displayed is only pages 1 to 20. For a complete PDF, you can download it by clicking the download button.