Major, trace and platinum-group element geochemistry of the Upper Triassic nonmarine hot shales in the Ordos basin, Central China

Qiu, Xinwei; Liu, Chiyang; Mao, Guangzhou; Deng, Yu; Wang, Feifei; Wang, Jianqiang

doi:10.1016/j.apgeochem.2014.11.028

Cited by 128 publications

(82 citation statements)

References 77 publications

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“…These properties enable REE pattern to be a useful geochemical tracer (L.P. Zhang et al, ; Nakada et al, ). The REEs of crude oil samples that were determined are listed in Table , and the REE contents of the mudstones and oil shales in Yanchang Formation are also listed in Table for comparison (Qiu et al, , b). The content of REE in the crude oils is three orders of magnitude lower than that of the rock samples.…”

Section: Resultsmentioning

confidence: 99%

“…Note: The REE contents (ppm) of Chang 7 oil shales are from Qiu et al, . The REE contents (ppm) of Chang 7 and Chang 9 mudstones are from Qiu et al, .…”

Section: Resultsmentioning

confidence: 99%

“…(d) REE Chondrite‐normalized distribution pattern of the lower crust. (e) REE Chondrite‐normalized distribution patterns of Chang 7 oil shales in the Ordos Basin (data from Qiu et al, ). (f) REE Chondrite‐normalized distribution patterns of mudstones from Chang 7 and Chang 9 subsections in the Ordos Basin (data from Qiu et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…Lower Jurassic Yanan Formation, unconformably overlying the Yanchang Formation, is also divided into ten subsections, namely, Yan 1 to Yan 10 from top to bottom (Duan, ), with the channel sandstone of Yan 10 and Yan 9 to be the most effective oil reservoirs (Song et al, ). Previous oil‐source correlation studies have suggested that the crude oils in the Ordos Basin were mainly derived from the Yanchang Formation (Zhang et al, ; Duan, ; Liu et al, ; Wang et al, ; Qiu et al, , b). In respect of specific hydrocarbon source, it is still debated.…”

Section: Introductionmentioning

confidence: 99%

“…The transition metals are particularly important in this regard (Oluwole et al, ). Geochemistry of source rock of Ordos Basin is relatively fairly documented in the literature (Qiu et al, , b). However, there is paucity of data on geochemistry of crude oils from Ordos Basin.…”

Section: Introductionmentioning

confidence: 99%

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Trace and rare earth element geochemistry of crude oils and their coexisting water from the Jiyuan Area of the Ordos Basin, N China

et al. 2017

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The concentration of trace and rare earth elements in 22 crude oil and five oilfield water samples, collected from Triassic Yanchang Formation and Jurassic Yanan Formation reservoirs in the Jiyuan Area of Ordos Basin, N China, was determined using inductively coupled plasma mass spectrometry (ICP-MS) for the first time. The oil samples were analysed to classify the oils into family and to determine the origin and depositional environment of organic matter that yield the oils using trace elements. The REE chondrite-normalized distribution patterns of the crude oils show light rare earth element (LREE) enrichment and right-oblique curves. These patterns could be divided into two distinct types that were consistent with that of the upper continental crust (UCC) and lower continental crust (LCC) characterizing by negative Eu anomalies and positive Eu anomalies, respectively. The REE concentrations in coexisting water samples are less than those in crude oils by a factor of ten. Cluster analysis also classified the oil samples from the Ordos Basin into two main groups. Integrated analysis of Co/Ni, V/Ni and V/ (V + Ni) values suggests that the organic matter have more terrigenous source input and the palaeoenvironment was anoxic and slightly oxic conditions. This study differs from previous studies by using trace element analyses of crude oils to constrain oil-source rock correlation. The results show that most of the crude oils in north Jiyuan area were derived from Chang 7 mudstones while those from Hongde area may be contributed by Chang 7 oil shales.

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Section: Resultsmentioning

confidence: 99%

“…Note: The REE contents (ppm) of Chang 7 oil shales are from Qiu et al, . The REE contents (ppm) of Chang 7 and Chang 9 mudstones are from Qiu et al, .…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Trace and rare earth element geochemistry of crude oils and their coexisting water from the Jiyuan Area of the Ordos Basin, N China

et al. 2017

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An integrated petrographical and geochemical study of the Tredian Formation in the Salt and Trans‐Indus Surghar ranges, North‐West Pakistan: Implications for palaeoclimate

Qureshi,

Rizwan,

Janjuhah

et al. 2023

The Depositional Record

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The Middle Triassic Tredian Formation is well exposed in the western region of the Salt Range. It is mostly composed of sandstone with minor alternations of shales and dolomite. This is the first integrated attempt using petrographical and geochemical features to reveal palaeoclimate during deposition of the Tredian Formation. This work sheds light on the petrographical and geochemical properties of the Tredian sandstone in order to date various layers and evaluate the palaeoclimate. The formation was sampled at two distinct stratigraphic layers for petrographic and geochemical analysis of major and trace elements. The sandstone of the Tredian Formation is sub‐feldspathic to feldspathic arenite with sub‐angular to rounded grains that are moderately to extensively sorted. The relative proportions of the quartz, feldspars and lithoclasts in the examined sandstone samples shows that the Tredian sediments originated from the interior of the craton during a transitional continental regime. Chemical index of alteration values of 59, chemical index of weathering values of 67, and plagioclase index of alteration values of 74.5 indicate a low to moderate degree of weathering in the Tredian sediment source region. Based on the silica content, SiO2/Al2O3 ratios (2.7–6.1; mean 4.1), and chemical maturity index, it is deduced that the Tredian Formation was deposited in chemically immature to sub‐mature and dry to semi‐arid conditions. Geochemical proxies indicate the acidic source of sediment and deposition on the passive margin of the Indian Plate. The trace element characteristics of the sediments, especially the Rb/Sr, Cu/Zn, Ni/Co, V/Cr and Sr/Ba ratios, indicate that the sediments originated from the first weathering cycle and support the notion that they were deposited in an oxidising continental environment. A semi‐arid to arid palaeoclimate predominated through the Middle Triassic at the north‐western passive continental margin of the Indian Plate in the south‐eastern Neo‐Tethys.

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Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures

Lou

Yin

et al. 2020

Energy Science & Engineering

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Major, trace and platinum-group element geochemistry of the Upper Triassic nonmarine hot shales in the Ordos basin, Central China

Cited by 128 publications

References 77 publications

Trace and rare earth element geochemistry of crude oils and their coexisting water from the Jiyuan Area of the Ordos Basin, N China

Trace and rare earth element geochemistry of crude oils and their coexisting water from the Jiyuan Area of the Ordos Basin, N China

An integrated petrographical and geochemical study of the Tredian Formation in the Salt and Trans‐Indus Surghar ranges, North‐West Pakistan: Implications for palaeoclimate

Acoustic and fractal analyses of the mechanical properties and fracture modes of bedding‐containing shale under different seepage pressures

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