Deposition conditions of the Jurassic lacustrine source rocks in the East Fukang Sag, Junggar Basin, NW China: Evidence from major and trace elements

2019 ◽  
Vol 55 (7) ◽  
pp. 4936-4953
Author(s):  
Jinqi Qiao ◽  
Luofu Liu ◽  
Xiaoqing Shang
Keyword(s):  
Trace Elements ◽  
Junggar Basin ◽  
Major And Trace Elements ◽  
Source Rocks ◽  
Nw China ◽  
Deposition Conditions

scholarly journals Organic Matter Accumulation Mechanism in the Lower Cambrian Strata from Well Luntan 1 in the Tarim Basin, NW China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Qian Deng ◽  
Haizu Zhang ◽  
Haozhe Wang ◽  
Zhiwei Wei ◽  
Bin Cheng ◽  
...  
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Tarim Basin ◽  
Enrichment Factors ◽  
Major And Trace Elements ◽  
Source Rocks ◽  
Drilling Depth ◽  
Nw China ◽  
High Productivity ◽  
Organic Matter Accumulation

A large amount of light crude oils have been found within 4000 to 7000 m deep strata of Cambrian, Ordovician, and Silurian reservoirs in the Tarim Basin, NW China. To enhance the understanding of parental materials of deep oils, a set of high-quality source rocks from the Yuertusi Formation in well Luntan 1 (maximum drilling depth of 8882 m) was studied in terms of their sedimentary condition and mechanism of organic matter enrichment. Total organic carbon (TOC) content, carbon isotope of kerogen (δ13Cker), and major and trace elements of the rocks from the Sinian Qigebulake, Cambrian Yuertusi, and Xiaoerbulake Formations in well Luntan 1 were analysed. The results showed that the δ13Cker value of the Yuertusi Formation barely changed with an average of -31.19‰. High TOC contents accompanied by enrichments of the bioessential trace elements, such as cadmium, chromium, copper, nickel, and zinc, occurred in the lower part of the Yuertusi Formation. Excess barium (Baxs) and phosphorus concentrations revealed high primary productivity during the deposition of the Yuertusi Formation. Moreover, variations in the enrichment factors of molybdenum, uranium, and vanadium and molybdenum-uranium covariation pattern indicated suboxic-anoxic conditions in the Qigebulake Formation, anoxic-euxinic conditions in the Yuertusi Formation, and suboxic-oxic conditions in the Xiaoerbulake Formation. The TOC contents were significantly correlated with the paleoproductivity and paleoredox parameters, indicating that high productivity and reducing conditions jointly controlled the organic matter accumulation and preservation in well Luntan 1.

Petroleum generation kinetics for Permian lacustrine source rocks in the Junggar Basin, NW China

2016 ◽  
Vol 98 ◽  
pp. 1-17 ◽  
Author(s):  
Baoli Xiang ◽  
Erting Li ◽  
Xiuwei Gao ◽  
Ming Wang ◽  
Yi Wang ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Source Rocks ◽  
Nw China ◽  
Petroleum Generation

scholarly journals Carboniferous source rocks in the Ludong-Wucaiwan area, Junggar Basin, NW China

2010 ◽  
Vol 37 (5) ◽  
pp. 523-530 ◽  
Author(s):  
Wang Xulong ◽  
Zhao Mengjun ◽  
Xiang Baoli ◽  
Da Jiang ◽  
Jiang Yiqin ◽  
...  
Keyword(s):  
Junggar Basin ◽  
Source Rocks ◽  
Nw China

scholarly journals Deep-Buried Triassic Oil-Source Correlation in the Central Junggar Basin, NW China

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Ming Wu ◽  
Jun Jin ◽  
Wanyun Ma ◽  
Baoli Xiang ◽  
Ni Zhou ◽  
...  
Keyword(s):  
Higher Plants ◽  
Linear Regression Analysis ◽  
Stable Carbon Isotope ◽  
Junggar Basin ◽  
Type A ◽  
Source Rocks ◽  
Central Basin ◽  
Nw China ◽  
Source Correlation ◽  
Oil Source

Whether there is an effective deep-buried lacustrine Triassic petroleum system in the Junggar Basin, NW China, has been enigmatic and debated for a long time. Here we conduct an oil-source correlation to address this issue. Results show that the extracted bitumens from the Triassic mudstones in the central basin have distinctive stable carbon isotope and biomarker compositions compared to the Permian-sourced and Jurassic-sourced hydrocarbons, the other two recognized sources in the study area. These characteristics include δ13C value of -30.46~-26.30‰, β-carotane/maximum n-alkane of 0.22–0.41, Pr/Ph of 1.00–1.51, C24 tetracyclic terpane/C26 tricyclic terpane of 0.43–0.96, Ts/Tm of 0.34–0.64, gammacerane/C30 hopane of 0.10–0.14, and regular steranes C27 > C28 < C29 with C29 sterane in dominance (40–50%). These suggest that the Triassic mudstones in the study area host fresh lacustrine organic matters with high input of higher plants. The Triassic-reservoired crude oils and extracts can be divided into two types. Through oil-source correlation, we infer that both type A and type B oils are derived from mixed Permian and Triassic source rocks. Linear regression analysis shows that the contribution from Triassic mudstones to type A and B oils is 67% and 31%, respectively. This implies that the deep-buried Triassic lacustrine mudstones in the Junggar Basin may have some oil-generation potential and thus might represent a new case of Triassic petroleum systems in China and deserves a more detailed and thorough study in future exploration and exploitation.

scholarly journals Geochemical characteristics of coal-measure source rocks and coal-derived gas in Junggar Basin, NW China

2009 ◽  
Vol 36 (3) ◽  
pp. 365-374 ◽  
Author(s):  
Li Jian ◽  
Jiang Zhenglong ◽  
Luo Xia ◽  
Wang Dongliang ◽  
Han Zhongxi
Keyword(s):  
Junggar Basin ◽  
Geochemical Characteristics ◽  
Source Rocks ◽  
Coal Measure ◽  
Nw China
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