Source rock potential and organic geochemistry of carboniferous source rocks in Santanghu Basin, NW China

Song, Daofu; He, Dengfa; Wang, Shurong

doi:10.1007/s12583-013-0339-9

Cited by 12 publications

(21 citation statements)

References 17 publications

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“…Reservoirs are tight sandstones, dolomitic mudstones, tuffaceous dolomites, and carbonates interbedded with Lucaogou mudstones (Liu et al, 2012a,b;Song et al, 2013;Meng et al, 2014), as well as tuffs in the overlying Tiaohu Formation (Liang et al, 2014;Ma et al, 2015Ma et al, , 2016 ( Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

“…Exploration wells have been primarily vertical with sub-economic oil flow or shows in only 15 of 35 PetroChina wells and commercial flow rates in only 4 wells (Reuters, 2012). Underlying Carboniferous volcaniclastic rocks are also productive (Song et al, 2013). Ma et al (2015) used organic geochemical and petrological approaches to demonstrate an oil-source correlation between oils reservoired in the tuffaceous Tiaohu Formation and the underlying Lucaogou Formation mudrocks in the Santanghu Basin.…”

Section: Introductionmentioning

confidence: 99%

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Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

Hackley

Fishman

et al. 2016

International Journal of Coal Geology

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Exploration for tight oil in the frontier Santanghu Basin of northwest China has resulted in recent commercial discoveries sourced from the lacustrine Upper Permian Lucaogou Formation, already considered a "world class source rock" in the Junggar Basin to the west. Here we apply an integrated analytical program to carbonate-dominated mudrocks from the Lucaogou Formation in Santanghu Basin to document the nature of organic matter (OM) in the context of an evolving lake system. The organic-rich samples wt.%; n=10) were widely spaced from a ~200 m cored section, interpreted from textural and mineralogical evidence to document transition from a lower under-filled to an overlying balanced-filled lake. Organic matter is dominated by moderate to strongly fluorescent amorphous material with Type I geochemical signature (HI values 510-755; n=10) occurring in a continuum from lamellar stringers, 10-20 µm thick, some ≥1 mm in length (possible microbial mat; preserved only in lower under-filled section) to finely-disseminated amorphous groundmass intimately intermixed with mineral matrix. Biomarkers for methanotrophs and photosynthetic cyanobacteria indicate a © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ complex microbial consortium. A unicellular prasinophyte green alga(?), similar to Tasmanites in marine rocks, is present as discrete flattened discs 50-100 µm in diameter. Type III OM including vitrinite (some fluorescent) and inertinite also is abundant. Solid bitumen, indicating local kerogen conversion, fills voids and occurs throughout the cored section. Vitrinite reflectance values are 0.47-0.58%, consistent with strong OM fluorescence but may be "suppressed". Other proxies, e.g., biomarker parameters, indicate the Lucaogou Formation is in the early oil window at this location. On average, slightly more amorphous OM and telalginite are present in the lower section, consistent with a shallow, stratified, saline environment with low sediment dilution. More inertinite is present in the upper section, indicating greater terrestrial influx and consistent with higher quartz and plagioclase content (dominantly authigenic chalcedony and albite). Laminated mudstones in the upper section indicate anoxia prevented bioturbation from benthic grazing, also indicating stratified water column conditions.A decrease upsection in authigenic dolomite with reciprocal increase of ankerite/siderite is consistent with decreasing salinity, as is an overall decrease in gammacerane index values. These observations suggest evolution from a shallow, stratified evaporative (saline) setting to a deeper, stratified freshwater basin with higher water input during Lucaogou deposition. The evolution from an under-filled to balance-filled lake in Santanghu Basin is similar to Lucaogou deposition in Junggar Basin, suggesting similar tectonic and climatic controls. Paleoclimate interpretations from other researchers in this area suggested an evolution from semi-arid ...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

Hackley

Fishman

et al. 2016

International Journal of Coal Geology

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“…Santanghu Coalfield is located at Barkol County and Yiwu County, Northeast Xinjiang Province, with a strip shape oriented NW-SE between Moqinwula and Suhaitu Mountains (Liu et al 2012a, b;Song et al 2013;Ge et al 2015;Hackleya et al 2016). Santanghu Coalfield is the largest integrated Coalfield prospecting area in Xinjiang and even in China.…”

Section: Geological Settingmentioning

confidence: 99%

The characteristic and evolution of coal-forming swamp in Hanshuiquan district, Santanghu Coalfield, Xinjiang, NW China, during the Middle Jurassic: evidence from coal petrography, coal facies and sporopollen

Feng¹,

He²,

Tian³

et al. 2019

Int J Coal Sci Technol

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“…The basin in an area of 2 3 × 10 4 km 2 and with accumulative petroleum reserves of more than 3 × 10 8 tons has been discovered at present. Since the initial formation in the Silurian period, this basin has experienced several tectonic movements, inducing well-developed regional faults and strongly weathered local rocks [23][24][25]. Volcanic eruptions frequently occurred in and around the basin during the late Palaeozoic era which probably produced some fracture channels by faulting.…”

Section: Geological Settingsmentioning

confidence: 99%

“…, and Kalagang Formation (C 2 k). The Kalagang Formation is primarily composed of fundamental intermediate volcanic lava that is incorporated within basalt, andesite, and transitional rock types [24]. Beneath the Kalagang Formation is the Haerjiawu Formation which contains hydrocarbon source rocks.…”

Section: Geological Settingsmentioning

confidence: 99%

Occurrence and Origin of H₂S from Volcanic Reservoirs in Niudong Area of the Santanghu Basin, NW China

Zheng

Liang

et al. 2019

Geofluids

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A series of samples including natural gas, formation water, and rocks were collected from volcanic rock reservoirs in the Niudong area of the Santanghu Oilfields and analyzed for their mineral and/or chemical compositions and sulfur and carbon isotopes in order to investigate the occurrence and origin of hydrogen sulfide (H2S). H2S was mostly dissolved in the formation water along with petroleum production in the study area. The δ34S values of on-well H2S samples varied in a range of 9.2‰ to 20.5‰, probably indicating thermochemical sulfate reduction (TSR) and/or thermal decomposition of organic sulfur-bearing compounds (TDS) as the genetic process for H2S. However, the chemical composition of formation waters from the Kalagang Formation (C2k) and their coefficient of desulfurization also revealed that TSR could be the main principle for H2S formation. Considering the regional geological background, especially the tectonic structures and thermal evolution features of the basin, it was concluded that H2S in the study area was dominantly produced by thermal genesis with TSR as a domain through interactions between hydrocarbons and aqueous sulfate dissolved from sulfate minerals.

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Source rock potential and organic geochemistry of carboniferous source rocks in Santanghu Basin, NW China

Cited by 12 publications

References 17 publications

Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

The characteristic and evolution of coal-forming swamp in Hanshuiquan district, Santanghu Coalfield, Xinjiang, NW China, during the Middle Jurassic: evidence from coal petrography, coal facies and sporopollen

Occurrence and Origin of H₂S from Volcanic Reservoirs in Niudong Area of the Santanghu Basin, NW China

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Source rock potential and organic geochemistry of carboniferous source rocks in Santanghu Basin, NW China

Cited by 12 publications

References 17 publications

Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

Organic petrology and geochemistry of mudrocks from the lacustrine Lucaogou Formation, Santanghu Basin, northwest China: Application to lake basin evolution

The characteristic and evolution of coal-forming swamp in Hanshuiquan district, Santanghu Coalfield, Xinjiang, NW China, during the Middle Jurassic: evidence from coal petrography, coal facies and sporopollen

Occurrence and Origin of H2S from Volcanic Reservoirs in Niudong Area of the Santanghu Basin, NW China

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Occurrence and Origin of H₂S from Volcanic Reservoirs in Niudong Area of the Santanghu Basin, NW China