Organic Matter Characteristics of the Kiliran and Ombilin Oil Shales, Indonesia

Widayat, AgusHaris; Anggayana, Komang; Syafrizal, Syafrizal; Heriawan, Mohamad Nur; Hede, ArieNaftali H.; Hakim, Andy Yahya Al

doi:10.1016/j.proeps.2013.01.013

Cited by 7 publications

(5 citation statements)

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“…As reported in several reports and publications (Suwarna et al, 2000(Suwarna et al, , 2001a(Suwarna et al, and b, 2002(Suwarna et al, , and 2006Kusumahbrata et al,2002Kusumahbrata et al, , 2003Kusumahbrata et al, , and 2004Heryanto et al, 2001;Susanto et al, 2004;Hermiyanto and Santy, 2008;Widayat et al, 2013), oil shale occurs in some parts of Sumatra, including Kiliranjao and Ombilin Basins in West Sumatra (Figure 1). Those oil shales have preliminary been studied, however their potential and quality have not been known well yet.…”

Section: Introductionmentioning

confidence: 76%

“…The excellent potential level of the Kiliranjao oil shale coincides with the Carnell et al, (2013) study. They stated that the dark brown, faintly laminated, highly organic-rich shale, with predominant algal matter, contains TOC varying Widayat et al (2013) who analyzed the oil shale samples from Kiliran (Kiliranjao) area, show the result as follows. TOC content of the samples gained varies from 2.10 -10.94%, pyrolysis yield (PY) of 6.08 -66.72 mg HC/g rock, HI ranging between 285.3 and 754.9, T max from 423 -435 o C, and PI of 0.01 -0.02.…”

Section: Organic Geochemical Analysismentioning

confidence: 99%

“…Thereby, the thermal maturity is of immature to early mature stage. In addition, Widayat et al (2013) who studied oil shale in Ombilin Basin, where Talawi area is situated, indicate that their samples contain TOC between 3.55 -5.87%, pyrolysis yield (PY) varying from 27.47 -42.79 mg HC/g rock, T max value between 435 -439 o C, PI of 0.06 -0.13, and HI ranging between 497.4 -752.7 range. These characteristics tend to show that the samples are included into a good potential category, and situated in oil-prone level.…”

Section: Organic Geochemical Analysismentioning

confidence: 99%

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Eo-Oligocene Oil Shales of the Talawi, Lubuktaruk, and Kiliranjao Areas, West Sumatra: Are they potential source rocks?

Iqbal¹

2014

Indonesian J. Geosci.

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To anticipate the increasing energy demand, additional data and information covering unconventional fossil fuels such as oil shale must be acquired to promote the usage of alternative energy sources to crude oil. The Talawi and Lubuktaruk regions situated within intra-montane Ombilin Basin, and the Kiliranjao area assumed to be located in a small intra montane Kiliranjao Sub-basin are occupied by Eo-Oligocene sediments of Sangkarewang and Kiliran Formations, respectively. Field activity, geochemical screening techniques, and organic petrographic analysis, supported by SEM mode, are methods used. Most of the oil shale sequence is typically of an organically rich-succession comprising predominantly well-bedded, laminated and fissile, brownish to dark grey organic-rich shales and mudstones. The exinite macerals within oil shale comprise mainly Pediastrum-lamalginite with minor cutinite, resinite, liptodetrinite, sporinite, bituminite, and rare Botryococcus-telalginite. Therefore, the oil shale deposits can be described as "lamosites". Minor vitrinite maceral is also recognized. TOC analysis on selected shale samples corresponds to a fair up to excellent category of source rock characterization. The kerogen is suggested to be of mixed Type II and Type I autochthonous materials such as alginite, with minor allochthonous substances. Oil samples collected appear to be positioned within more oil prone rather than gas prone. Thermal maturity of the oil shales tends to show an immature to marginally/early mature stage. By evaluating all the results of geochemical and organic petrological analyses conducted on shale lithologies (shale and mudstone), it can be concluded that the oil shales in those areas are effective source rocks having a favourable potential for generating shale oil or gas to be included as alternative energy resources in the future.

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Section: Introductionmentioning

confidence: 76%

Section: Organic Geochemical Analysismentioning

confidence: 99%

Section: Organic Geochemical Analysismentioning

confidence: 99%

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Eo-Oligocene Oil Shales of the Talawi, Lubuktaruk, and Kiliranjao Areas, West Sumatra: Are they potential source rocks?

Iqbal¹

2014

Indonesian J. Geosci.

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“…Journal homepage: h p://ijog.bgl.esdm.go.id ISSN 2355-9314 (Print), e-ISSN 2355-9306 (Online) I J O G petrology (Fatimah and Ward, 2009;Widayat et al, 2013) and organic geochemistry (Anggayana et al, 2014;Widayat et al, 2013). With respect to the presence of organic matter in the oil shale, the authors have demonstrated the depositional environments responsible for the organic matter preservation.…”

Section: Indonesian Journal On Geoscience Geological Agency Ministry mentioning

confidence: 99%

Precipitation of Calcite during the Deposition of Paleogene Sangkarewang Oil Shale, Ombilin Basin, West Sumatra, Indonesia

Widayat¹,

Anggayana²,

Khoiri³

2015

Indonesian J. Geosci.

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Geochemical and petrographical analyses were carried out to investigate the occurrence of calcite in the former Ombilin lacustrine lake. The study involves eight samples taken from a 56 m long drill core of Sangkarewang oil shale. Geochemical investigation showed that the samples consist of varied terrigenous input represented by Si, Al, K, and Ti, and autochthonous input represented by S, total organic carbon (TOC), and d 13 C of bulk organic matter. Along the drill core profile the abundance of autochthonous input decreases upwards, while that of terrigenous input oppositely increases upwards. Petrographical analysis revealed that calcite is a major mineral in the samples. In this study, the abundance of calcite could be represented by the abundance of Ca, as calcite is the only significant Ca containing mineral. Ca is abundant in the samples (8.4% in average) and its concentration varies similarly with those of S, TOC, and d 13 C, suggesting that the element as well as calcite incorporates the autochthonous input. The variation of calcite abundance in the drill core profile is considered to be related with primary productivity changes during the development of the former lake. Higher primary productivity represented by more positive of d 13 C value (-24.8‰) during the deposition of the lower part of the drill core profile promoted the higher amount of deposited organic matter. In such environment, the supersaturation of carbonate ion in lake water was also reached and significant precipitation of authigenic calcite occurred. As the lake developed, the primary productivity decreased as indicated by more negative of d 13 C value (eventually-26.8‰). This condition led to the decreases of deposited organic matter and calcite in the lake sediments.

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“…Some studies have been carried out in order to investigate the geological framework and petroleum system [4][5][6][7][8]. However, these studies dealt only with general geological approaches such as geological mapping, petrography, palynology, and mineralogy.…”

Section: Introductionmentioning

confidence: 99%

Depositional Environment of the Sangkarewang Oil Shale, Ombilin Basin, Indonesia

2014

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Abstract. Five samples from a 56 m long drill core that was recovered from the lacustrine Sangkarewang oil shale have been studied by means of petrography and organic geochemistry in order to investigate the organic matter composition and depositional environment of the shale. The organic matter consisted of abundant lamalginite (30%, v/v) and a very limited amount of vitrinite, suggesting an aquatic depositional environment with minor terrestrial influence. Organic geochemical analysis exhibited the dominance of pristane, phytane, and generally n-alkane compounds. These compounds may have originated mostly from aquatic photosynthetic organisms. The oil shale was likely deposited in an anoxic lake environment as suggested by the presence of framboidal pyrite (6%, v/v) and preserved organic matter with a total organic carbon (TOC) percentage of about 4.9%. The pristane/phytane ratio was relatively high (about 3.9) and thought to be source sensitive rather than redox sensitive. Hopanoid and aryl isoprenoid compounds were present in minor amounts. The latter compounds are interpreted to be derived from green sulfur bacteria dwelling in an anoxic environment with the presence of H 2 S in bottom water.

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Organic Matter Characteristics of the Kiliran and Ombilin Oil Shales, Indonesia

Cited by 7 publications

References 10 publications

Eo-Oligocene Oil Shales of the Talawi, Lubuktaruk, and Kiliranjao Areas, West Sumatra: Are they potential source rocks?

Eo-Oligocene Oil Shales of the Talawi, Lubuktaruk, and Kiliranjao Areas, West Sumatra: Are they potential source rocks?

Precipitation of Calcite during the Deposition of Paleogene Sangkarewang Oil Shale, Ombilin Basin, West Sumatra, Indonesia

Depositional Environment of the Sangkarewang Oil Shale, Ombilin Basin, Indonesia

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