Journal of Petroleum and Sedimentary Geology

Korean Society of Petroleum and Sedimentary Geology

J Pet Sediment Geol 1(1):1-15

eISSN: 2635-7704

DOI: https://doi.org/10.31697/jpsg.2018.1.1.1

Article

인도네시아 칼리만탄 남동부 바리토 분지의 석유 탐사 잠재성 고찰: 인접한 쿠타이 분지와의 석유시스템 비교

원석기¹, 신영재²^,^*, Herru Lastiadi Setiawan³, Jonathan Setyoko Hadimuljono³, 손미라²

A study on petroleum exploration potential of Barito Basin in southeastern Kalimantan, Indonesia: comparison of petroleum system with adjacent Kutai Basin

SeokGi Won¹, Young Jae Shinn²^,^*, Herru Lastiadi Setiawan³, Jonathan Setyoko Hadimuljono³, Mira Son²

^*Corresponding Author :Young Jae Shinn, Tel: +82-42-868-3251, Fax: +82-42-868-3414, E-mail: shinn21@kigam.re.kr

ⓒ Copyright 2018 Korean Society of Petroleum and Sedimentary Geology. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Jun 21, 2018 ; Revised: Jun 28, 2018 ; Accepted: Jun 29, 2018

Published Online: Oct 31, 2018

요약

인도네시아 칼리만탄 남동부에 위치한 신생대 열개 분지인 바리토 분지와 쿠타이 분지는 석유탐사 역사가 오래된 분지이다. 지리적으로 인접한 두 분지는 분지형성 기작과 퇴적환경 발달이 매우 유사하지만 쿠타이 분지에서는 다수의 대규모 유전이 발견된 반면, 바리토 분지에서는 분지 북동부 지역에 국한되어 유전이 발견되었다. 두 분지의 퇴적환경은 대체로 동시열개 호소성 환경에서 삼각주 퇴적상, 후열개 해양성 환경으로 변화하는 유사한 특징을 나타낸다. 하지만, 바리토 분지는 동시열개 탄정층, 쿠타이 분지는 후열개 삼각주 퇴적층이 주요한 석유시스템을 형성하고 있으며, 각각 동시열개 단계의 석유시스템 유형과 후열개 단계의 석유시스템 유형과 대비된다. 이와 같이 석유시스템 발달 유형이 다른 이유는 조구조적 운동과 관련된 융기와 분지 침강이 시기적으로 다르게 일어나 근원암 매몰 심도와 성숙도에 영향을 미쳤기 때문이다. 메라투스 산맥의 차별적인 융기는 바리토 분지의 북동부 지역을 중심으로 동시열개 퇴적층인 탄정층의 열적 성숙이 가능하게 하였다. 반면에 칼리만탄 중앙 산맥의 융기는 쿠타이 분지의 동시열개 퇴적층의 삭박을 야기하였고, 삭박된 퇴적물들은 후열개 단계 동안 두꺼운 삼각주 퇴적층을 형성하면서 충분히 매몰되어 후열개 단계 석유시스템 유형이 발달하게 되었다. 바리토 분지의 탐사 잠재성은 이미 알려진 동시열개 탄정층에 여전히 남아 있고, 그 외에 신생대 이전 균열 기반암, 후열개 와루킨층 저류암, 바리토 분지 서쪽 지역 베라이 탄산염 저류암에 대한 추가적인 탐사와 평가가 필요하다.

ABSTRACT

The Kutai and Barito basins are the Cenozoic rift basins in southeastern Kalimantan, Indonesia and are very mature for hydrocarbon exploration history. Both basins have experienced similar structural evolution and depositional history. Despite the similarity between two basins, large oil and gas fields were found in the Kutai Basin, whereas not common in the Barito Basin and localized in its northeastern part. Depositional history of both basins evolved from lacustrine syn-rift to marine post-rift stages through fluvio-deltaic transitional environment. However, different type of petroleum system has been identified in the Barito and Kutai basins. Syn-rift lacustrine to fluvio-deltaic sequence (Tanjung Formation) is an essential element of petroleum system in the Barito Basin and post-rift deltaic sequence (Balikpapan and Kampung Baru formations) is a key element in the Kutai Basin. Such difference in the petroleum system type is associated with difference in burial history, affected by spatio-temporal variation of uplifting and basin subsidence. The differential uplifting of the Meratus Mountains allowed the syn-rift Tanjung Formation to reach thermal maturation only in the northeastern Barito Basin. The uplifting of the Central Kalimantan Mountains, however, caused erosion of the syn-rift sequence in the Kutai Basin and supplied enough sediments to form the post-rift deltaic sequence with thermal maturity. Future exploration potential of the Barito Basin still remains in the well-known, syn-rift Tanjung Formation and needs to be further evaluated from the pre-Cenozoic fractured basement, the post-rift Warukin, and the Berai limestone reservoirs particularly in the western region of the Barito Basin.

Keywords: 바리토 분지; 쿠타이 분지; 석유 시스템; 석유 탐사; 칼리만탄

Keywords: Barito Basin; Kutai Basin; petroleum system; hydrocarbon exploration; Kalimantan

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