Geochemical Assessment of Late Paleogene Synrift Source Rocks in the South Sumatra Basin

Sutriyono, Edy

doi:10.21660/2016.23.1141

Cited by 4 publications

(3 citation statements)

References 27 publications

(41 reference statements)

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“…Fig. 2 Generalized stratigraphy of the Paleogene South Sumatra basin redrawn from [26] (left). Also shown is the division of coal seams within the Muara Enim Formation (right).…”

Section: Geology: An Overviewmentioning

confidence: 99%

Gas Content Appraisal of Shallow Coal Seams in the South Palembang Basin of South Sumatra

Asmina¹

2017

GEOMATE

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The gas content of coal seams in the South Palembang basin has been assessed using well log data and core analysis. The seams are stratigraphically exposed at shallow levels (<300 m), and present in the Late Miocene-Early Pliocene Muara Enim sequence. The coal thickness of single bed in each well varies between ~7 m and ~14 m. All samples analyzed are low rank coals, suggesting subbituminous and high volatile bituminous. Vitrinite reflectance (VR) measurements vary from 0.49-0.59%, but there appears an increase in the VR value with depth. The coals contain predominantly huminite (56-86 vol. %), whereas liptinite and inertinite are less abundant, ranging from 0.2-12.2 vol. % and 4.2-19.2 vol. % respectively. These low rank coals comprise a small number of minerals (6-11 vol. %), high moisture content of 2.4-12.6 wt. %, volatile matters of >39 wt. %, and fixed carbons of >43 wt. %. The amount of gas within individual coal layer varies from 4.1-5.3 m 3 /t, but the gas content tends to increase with deeper burial. The sum of the estimated gas-in-place is approximately 3,019x10 6 m 3 . In addition, the onset of gas generation within these near surface coals may occur due to biogenic controls during the coal-forming processes, as a result of sedimentation of the overburden in Pliocene time prior to the subsequent basin inversion commencing in the Plio-Pleistocene.

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“…Fig. 2 Generalized stratigraphy of the Paleogene South Sumatra basin redrawn from [26] (left). Also shown is the division of coal seams within the Muara Enim Formation (right).…”

Section: Geology: An Overviewmentioning

confidence: 99%

Gas Content Appraisal of Shallow Coal Seams in the South Palembang Basin of South Sumatra

Asmina¹

2017

GEOMATE

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“…Research on the characteristics and potential of hydrocarbon source rocks in Indonesia has been studied by several researchers in several locations, including in the Bogor Basin by Praptisih [1] and Jatmiko and Praptisih [2]. Studies in the Sumatra area were conducted by Zajuli and Panggabean [3][4], Syaifudin [5], and Sutriono et al [6]. On the other hand, similar studies in the Kalimantan area were conducted by Subroto [7] and Santi and Panggabean [8], and in Timor by Permana et al [9].…”

Section: ■ Introductionmentioning

confidence: 99%

Geochemistry and Potential Hydrocarbon Source Rocks of Rambatan Formation in Karangkobar Area, Central Java

Praptisih¹,

Sendjaja²,

Isnaniawardhani³

et al. 2022

Indones. J. Chem.

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The purpose of the study in the Karangkobar area was to investigate the source rock potential of the fine-grained surface samples of clastic sediments. The use of surface samples for source rock potential study in Indonesia is still limited. We conducted geochemical laboratory analyses in this research, including Total Organic Carbon (TOC), Rock-Eval Pyrolysis (REP), and Gas chromatography–mass spectrometry (GCMS). Seventeen samples have been analyzed for their TOC content. The result shows that TOC values varied between 0.36–1.55%, indicating that the source rock potential level based on the surface samples is poor to fair organic richness. REP was conducted on 16 samples, and the results show that the hydrocarbon-generating characteristics (HI values) ranged from 15 to 163 mg HC/g TOC. The kerogens identified included type II and III kerogen, which indicated the oil and gas-generating potential. Pyrolysis temperature is at maximum (Tmax) in the 276–458 °C, indicating that the samples were thermally immature to mature. GCMS analysis of source rock indicated that the depositional environment of the organic material derived from an open marine and plankton environment. This study is essential to complete the understanding of the petroleum system in Central Java.

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“…The early discovery of the oil production was from a shallow layer close to surface seeps that were exposed within anticline structures. The Talang Akar Formation has been hypothesized as the source rock for oil generation [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Time Reverse Modeling of Hydrocarbon Detection for Passive Seismic Source Localization: A Case Study of Synthetics and Real Data From the South Sumatra Basin, Indonesia

Haris¹,

Silaban

Riyanto³

et al. 2017

GEOMATE

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Subsurface passive seismic source localization, which is associated with hydrocarbon indication, has become an important tool for passive seismic data modeling. A time-reverse modeling (TRM) algorithm, which was applied to passive seismic data, has been developed and implemented to locate passive seismic sources by using an acoustic finite difference technique. By performing TRM, the recorded passive seismic amplitudes can be focused at their source depth, even though the focused point cannot be warranted as a source point. This paper aims to verify the ability of the developed TRM algorithm in localizing the passive seismic source associated with reservoir depth by means the possible movement of fluid. TRM was applied to synthetic and recorded passive seismic data from a gas reservoir area in the South Sumatra Basin. Synthetic passive seismic data were generated within a two-dimensional velocity model and calculated by using a finite difference algorithm simulating acoustic low-frequency wave propagation. TRM application to the synthetic data showed that passive seismic sources can be properly located in the same position as the original source. In addition, our application to the real passive seismic data sets showed that the passive seismic source is distributed randomly in the depth range of 700 m up to 1500 m, which was represented by high particle velocities.

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Geochemical Assessment of Late Paleogene Synrift Source Rocks in the South Sumatra Basin

Cited by 4 publications

References 27 publications

Gas Content Appraisal of Shallow Coal Seams in the South Palembang Basin of South Sumatra

Gas Content Appraisal of Shallow Coal Seams in the South Palembang Basin of South Sumatra

Geochemistry and Potential Hydrocarbon Source Rocks of Rambatan Formation in Karangkobar Area, Central Java

Time Reverse Modeling of Hydrocarbon Detection for Passive Seismic Source Localization: A Case Study of Synthetics and Real Data From the South Sumatra Basin, Indonesia

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