Sedimentary facies associations and sequence stratigraphy of source and reservoir rocks of the lacustrine Eocene Niubao Formation (Lunpola Basin, central Tibet)

Wei, Wei; Lu, Yongchao; Xing, Fengcun; Liu, Zhongrong; Pan, Lei; Algeo, Thomas J.

doi:10.1016/j.marpetgeo.2017.07.032

Cited by 34 publications

(24 citation statements)

References 61 publications

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“…The upper Niubao Formation is composed of siltstone, dolomitic mudstone, evaporite, conglomerate and oil shale (Wei et al, 2017). Overall, this unit exhibits upward-fining trends from the lower to middle portions and finally the upper part (Fig.…”

Section: Depositional Environmentsmentioning

confidence: 98%

“…2). This sequence is overlain by shallow to semi-deep lacustrine associations of upper Niubao Formation, which was intersected by Wang-1 borehole and consists mainly of dolostone, dolomitic mudstone and massive sandstone with conglomeratic intercalations (Wei et al, 2017).…”

Section: Geological Settingmentioning

confidence: 99%

“…3F). A scarcity of detrital grains of coarse quartz in the dolomitic layer may suggest deposition in a low-energy, restricted lacustrinemargin setting under dry conditions (Wei et al, 2017). Small-scale ripples on the siltstone surface may have developed in a nearshore setting, as a product of wave oscillation.…”

Section: Depositional Environmentsmentioning

confidence: 99%

“…It has been suggested that the abundant terrestrial plant debris (Fig. 3G) was derived from developed swamps on river floodplains (Wei et al, 2017). Detailed field outcrop analysis (DeCelles et al, 2007) showed that the correlative Tertiary deposits in the adjacent Nima Basin were also characterized by massive red gypsiferous siltstone, which were interpreted as evaporitic playa deposits.…”

Section: Depositional Environmentsmentioning

confidence: 99%

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Nucleation and stabilization of Eocene dolomite in evaporative lacustrine deposits from central Tibetan plateau

Wen

Sánchez‐Román

et al. 2020

Sedimentology

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In past decades, the formation of dolomite at low temperature has been widely studied in both natural systems and cultured experiments, yet the mechanism(s) involved in the nucleation and precipitation of dolomite remains unresolved. Late Eocene dolomitic deposits from core in the upper Niubao Formation (Lunpola Basin, central Tibetan Plateau, China) are selected as a case study to understand the dolomitization process(es) in the geological record. Dolomite formation in Lunpola Basin can be ascribed to a different mechanism forming the large quantities of replacive dolostones in the geological record; and provides a potential fossil analogue for primary dolomite precipitation at low temperature. This analogue consists of an alternation of laminated dolomitic beds, organic‐rich and siliciclastic layers; formed in response to intense evaporation interpreted to take place in a continental shallow lake environment. Mineralogical, textural and stable isotopic evaluations suggest that the dolomite from those dense‐clotted laminated beds is a primary precipitate. At the nanoscale, these dolomitic beds are composed of Ca–Mg carbonate globular nanocrystals (diameter 80 to 100 nm) embedded in an organic matrix and attached to clay flakes. Micro‐infrared spectroscopy analyses have revealed the presence of aliphatic compounds in the organic matrix. Microscopic and elemental compositional studies suggest that clay surfaces may facilitate the nucleation of dolomite at low temperature in the same way as the organic matrix does. The dolomite laminae show values for δ18OVPDB from −3.2 to −1.76‰ and for δ13CVPDB from −2.62 to −3.78‰. Inferred δ18OSMOW values of the lake water reveal typical evaporitic hydrological conditions. These findings provide a potential link to primary dolomite formation in ancient and modern sedimentary environments; and shed new light on the palaeoenvironmental conditions in central Tibet during the Eocene.

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Section: Depositional Environmentsmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Section: Depositional Environmentsmentioning

confidence: 99%

Section: Depositional Environmentsmentioning

confidence: 99%

See 2 more Smart Citations

Nucleation and stabilization of Eocene dolomite in evaporative lacustrine deposits from central Tibetan plateau

Wen

Sánchez‐Román

et al. 2020

Sedimentology

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“…The petroleum potentials of lacustrine source rocks from the Gulf of Thailand will be extremely useful for other petroleum systems with lacustrine sources (e.g. Ding et al, 2015, Wei et al, 2017. The knowledge gained from this kind of analysis of hydrocarbon potentials of multipetroleum systems will serve as a guide in exploring sedimentary basins with more than one petroleum systems.…”

Section: Significance and Wider Implicationsmentioning

confidence: 99%

Hydrocarbon Generation Potentials of Cenozoic Lacustrine Source Rocks: Gulf of Thailand, Southeast Asia

Akinlotan¹,

Jolly²,

Anyiam³

2018

International Journal of Geology and Earth Sciences

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Several hydrocarbon-rich Cenozoic basins are scattered across Southeast Asia and they present excellent opportunity to examine these rich but under-explored basins. These near-shore basins have petroleum potentials that are associated with the Oligocene-Miocene fluvio-lacustrine multipetroleum systems but are largely underexplored. This study evaluates the petroleum source potentials of some selected Cenozoic basins via maturation modelling analysis, burial and heat flow histories. ZetaWare's Genesis modelling software was used for the study with burial history and thermal history parameters (vitrinite, TOC and HI). The maximum transformation of kerogen to hydrocarbon for source rocks in these basins may be as high as 80-100%. Analyses showed that threshold maturity for maximum hydrocarbon expulsion is around 1.0% vitrinite reflectance (Ro). Thermal maturation is accentuated with depth-especially southward and offshore. Source rocks in the Western (central) and Hua Hin (north) Basins are the most prolific (with up to 400 mgHC/gtoc); least prolific sources are in the Western (north and south) Basin with 96-120 mgHC/gtoc and 40-50 mgHC/gtoc respectively. These sources have expelled only secondary amount of gas (11-80mg/gtoc) because they are oil prone sources. Oil to gas expulsion ratio of 7:1 is estimated. Hydrocarbon expulsion started in the Late Miocene after the emplacement of all necessary traps. Deeply buried sources show good prospects for possible residual hydrocarbon generation. Moreover, all the modelled wells displayed source rocks that expelled significant quantity of hydrocarbon. All these basins show strong correlation with Pattani Basin, the most prolific hydrocarbon-bearing basin in the Gulf of Thailand.

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The middle‐upper Eocene Loza‐Portilla Formation (Western Pyrenees, North Spain): Palustrine‐lacustrine carbonate‐dominated sequences in a piggy‐back basin under compressional tectonic stress

Larena,

Murelaga,

Sanjuan

et al. 2024

The Depositional Record

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The Loza‐Portilla Formation consists of 100–300 m of alluvial siliciclastics and palustrine‐lacustrine carbonates and minor evaporites, infilling a tectonically active syncline basin (Miranda‐Trebiño Basin, Basque‐Cantabrian Pyrenees), which developed over the south Pyrenean Thrust Front during middle to late Eocene times. Detailed facies characterisation and correlation allowed the reconstruction of the stratigraphic architecture of the formation, which consists of three unconformity‐bounded depositional sequences, representative of three successive phases of carbonate lake development. A model of low‐energy shallow lake with ramp margins and wide palustrine fringes fits well with the architecture of the three stacked carbonate‐dominated sequences, with stratal architectures characteristic of shallow balanced‐fill lake basins. A range of limestones representative of different palustrine and lacustrine environments is distinguished, commonly arranged in metre‐thick facies sequences and cycles reflecting water‐level changes and marked shoreline shifts, likely associated with prevailing tectonic and climate conditions. Compressional tectonism and associated halokinetic movements exerted major control on depositional trends and distribution of the main depocentres. The Loza‐Portilla Formation is of major palaeogeographical significance in the tecto‐sedimentary evolution of the Pyrenean domain, labelling the first phase of uplift and emersion that affected large areas of the Basque‐Cantabrian (western) Pyrenees, prior to end‐Eocene generalised continentalisation.

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Sedimentary facies associations and sequence stratigraphy of source and reservoir rocks of the lacustrine Eocene Niubao Formation (Lunpola Basin, central Tibet)

Cited by 34 publications

References 61 publications

Nucleation and stabilization of Eocene dolomite in evaporative lacustrine deposits from central Tibetan plateau

Nucleation and stabilization of Eocene dolomite in evaporative lacustrine deposits from central Tibetan plateau

Hydrocarbon Generation Potentials of Cenozoic Lacustrine Source Rocks: Gulf of Thailand, Southeast Asia

The middle‐upper Eocene Loza‐Portilla Formation (Western Pyrenees, North Spain): Palustrine‐lacustrine carbonate‐dominated sequences in a piggy‐back basin under compressional tectonic stress

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