Geochemical characteristics and origins of the crude oil of Yanchang Formation Chang 2 in Ansai Area, Erdos Basin, China

Lu, Zhizhong; Chen, Shijia; Yong, Li; He, Qing; Zhang, Jingyue; Hai, Zhenyin

doi:10.1080/10916466.2018.1482327

Cited by 10 publications

(16 citation statements)

References 7 publications

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“…All the oil samples from the Jiyuan Area had V/Ni values less than 1, except five samples with V/Ni ratios slightly higher than 1 (Table 3), which is an enrichment of nickel over vanadium, thus indicating that the oil samples were mainly derived from terrestrial organic matter. This interpretation was reached in accordance with previous work (Wang et al, 1995;Hou et al, 2007;Yao et al, 2007;Zhang et al, 2008b;Liu et al, 2013), which reported a nonmarine source rock with type III/II kerogen for the crude oil in Ordos Basin. The relative abundance of C 27 , C 28 and C 29 regular steranes in the crude oils from the study area also suggest a combination contribution of lower hydrobiont and terrigenous higher plants to the crude oils .…”

Section: Partition Coefficients Of Ree Between Crude Oil and Watersupporting

confidence: 92%

“…In particular, the organic matter of crude oils collected from reservoirs in north Jiyuan area was deposited under oxic conditions. It is widely accepted that the Upper Triassic black oil shale developed in an anoxic environment while the mudstone developed in a slightly oxic environment, which was mainly inferred from organic geochemistry and element analysis (Zhang et al, 2008b;Yang et al, 2010;Liu et al, 2013;Qiu et al, 2015a, b). Thus, in the study area, 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.…”

Section: Oil-source Rock Correlationmentioning

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, 2012), with the channel sandstone of Yan 10 and Yan 9 to be the most effective oil reservoirs (Song et al, 2003). 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, 2008b;Duan, 2012;Liu et al, 2013;Wang et al, 2014;Qiu et al, 2015a, b). In respect of specific hydrocarbon source, it is still debated.…”

Section: Introductionmentioning

confidence: 99%

“…Chu et al (2013) suggested that the oils in Chang 8 reservoir were balanced by mutual contribution of Chang 7 and Chang 9 source rocks. Hou et al (2007) believed that the crude oils in the Jiyuan area were derived from Chang 7 mudstones of Upper Triassic in Ordos Basin, while Liu et al (2013) indicated that most of the crude oils that distributed in the Jiyuan, Xifeng, Baibao, Heshui and Huaqing areas were coming from Chang 7 member oil shale, while the oils coming from Chang 7 dark mudstone are fewer.…”

Section: Introductionmentioning

confidence: 99%

“…However, there is paucity of data on geochemistry of crude oils from Ordos Basin. A few data that are available are on organic geochemistry of Ordos oils (Duan et al, 2008;Duan, 2012;Liu et al, 2013). Data on trace element properties of crude oils from Ordos Basin are very scarce, not to mention the oilfield water that coexists in the reservoir with oil.…”

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: Partition Coefficients Of Ree Between Crude Oil and Watersupporting

confidence: 92%

Section: Oil-source Rock Correlationmentioning

confidence: 99%

Section: Introductionmentioning

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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Paleogeotemperature and maturity evolutionary history of the source rocks in the Ordos Basin

Ren

et al. 2017

Geological Journal

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Tectonothermal evolution has an important control on maturity and hydrocarbon‐generation of source rocks. On the basis of analysis of the present‐day geothermal gradient, rock thermophysical parameters and heat flow, the thickness contour and vitrinite reflectance can be identified, and the distribution of thermal anomaly was discussed. The paleogeotemperature and paleogeothermal gradients are calculated after the recovery of the erosional thickness. With the theory of the recovering of the superposed and modified sedimentary basin, the evolutionary history since the end of Triassic, the end of Jurassic, the Late Early Cretaceous is presented for two sets of source rocks recovered in various perspectives of plans, cross‐sections, important wells, and typical areas. The impact of tectonothermal evolution on the maturity and hydrocarbon‐generation history of the source rocks is discussed. The paleogeothermal gradient (4.0 °C/100 m on average) is higher than the present one (2.9 °C/100 m on average). With the slightly continuous increase since the Late Paleozoic, the paleogeotemperature of the Ordos Basin reached its maximum in Late Early Cretaceous and decreased continuously from then on. The paleogeotemperature and maturity of the source rocks continuously increased before Late Early Cretaceous. The tectonothermal event during Late Jurassic to Early Cretaceous controlled the source rocks with the high temperature and maturity in the Wuqi‐Qingyang‐Fuxian. The temperature decreased, and the maturity hardly changed after the Late Cretaceous. The source rocks of the Shanxi Formation reached maturity, high maturity and over‐maturity at the Late Triassic, the Late Jurassic, and the Early Cretaceous, respectively. The source rocks of the Yanchang Formation reached low maturity and maturity sequentially all in the Early Cretaceous.

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Optimization of oil source correlation indexes: a case of Chang 10 member in Ordos Basin’ Zhoujiawan area

Chen

Hou

et al. 2021

Arab J Geosci

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Geochemical characteristics and origins of the crude oil of Yanchang Formation Chang 2 in Ansai Area, Erdos Basin, China

Cited by 10 publications

References 7 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

Paleogeotemperature and maturity evolutionary history of the source rocks in the Ordos Basin

Optimization of oil source correlation indexes: a case of Chang 10 member in Ordos Basin’ Zhoujiawan area

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