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

Published on Feb 1, 2015in Applied Geochemistry 2.89
· DOI :10.1016/j.apgeochem.2014.11.028
Xinwei Qiu1
Estimated H-index: 1
(Northwest University (United States)),
Chiyang Liu4
Estimated H-index: 4
(Northwest University (United States))
+ 3 AuthorsJianqiang Wang3
Estimated H-index: 3
(Northwest University (United States))
Cite
Abstract
Abstract The Upper Triassic Chang 7 non-marine hot shales have been proven to contribute to Mesozoic oil reservoirs in the Ordos basin, Central China. These shales have been studied extensively in sedimentology, petrology and organic geochemistry. However, the factors controlling the development of the shales are still ambiguously constrained. This paper presents the major, trace, and platinum-group elements (PGEs) data to address these issues. The Chemical Index of Alteration (CIA), Chemical Index of Weathering (CIW), C -values and clay mineral compositions indicate that the Chang 7 hot shales were developed in a humid paleoclimate. The indicators of redox conditions (Eu/Eu ∗ , Ce/Ce ∗ , Ce anom , δU, U/Th, V/(V + Ni) and V/Cr) suggest that the Chang 7 hot shales were developed under anoxic environment. Uranium enrichment (average 46.10 ppm) is an important distinguished signature of the Chang 7 hot shales, which was mainly related to synchronous volcanic ash sediments and/or possibly hydrothermal fluids. The PGE concentrations of the Chang 7 hot shales were reported for the first time here, and can be subdivided into two groups. The total abundances of the Group One samples are relatively lower and derived mainly from detrital minerals, while the Group Two samples are relatively higher, and are also likely linked to the synchronous volcanic ash sediments and/or possibly hydrothermal fluids. Combined with the regional geological setting, we tentatively propose that the tectonics is the major control on the development of the Chang 7 hot shales.
  • References (96)
  • Citations (18)
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References96
Newest
Published on Feb 1, 2015in Mineralium Deposita 3.40
Shifeng Dai49
Estimated H-index: 49
(CUMT: China University of Mining and Technology),
Vladimir V. Seredin18
Estimated H-index: 18
(RAS: Russian Academy of Sciences)
+ 5 AuthorsPeipei Wang10
Estimated H-index: 10
(CUMT: China University of Mining and Technology)
We present multi-element data on the super-high-organic-sulfur (SHOS; 5.19 % on average) coals of Late Permian age from Guiding, in Guizhou Province, China. The coals, formed on restricted carbonate platforms, are all highly enriched in S, U, Se, Mo, Re, V, and Cr, and, to a lesser extent, Ni and Cd. Although the Guiding coals were subjected to seawater influence, boron is very low and mainly occurs in tourmaline and mixed-layer illite/smectite. Uranium, Mo, and V in the coal are mainly associat...
Published on Feb 1, 2014in Journal of Asian Earth Sciences 2.76
Xinwei Qiu3
Estimated H-index: 3
(CAS: Chinese Academy of Sciences),
Chiyang Liu4
Estimated H-index: 4
(Northwest University (United States))
+ 3 AuthorsJianqiang Wang3
Estimated H-index: 3
(Northwest University (United States))
Abstract Tuff intervals of Upper Triassic Yanchang Formation are laterally widespread in the Ordos basin, Central China. This paper focuses on magmatic origins and potential source regions of these tuff intervals through detail depositional, petrographic and geochemical analyses. Most of the tuff intervals are well-documented at the bottom of the Chang7 oil reservoir unit and can be correlated laterally, and certain tuff beds are reworked by turbidity current or seismic activity. Petrographic st...
Published on Sep 1, 2013in American Journal of Science 2.98
Yusheng Wan39
Estimated H-index: 39
,
Hangqiang Xie21
Estimated H-index: 21
+ 10 AuthorsMingzhu Ma17
Estimated H-index: 17
Published on Jan 1, 2013in Acta Petrologica Sinica 1.32
Liu Xianyang1
Estimated H-index: 1
(PetroChina)
The Changqing Oilfield Company has extensively and efficiently developed reservoirs with ultra-low permeability between 0.3 mD and 1 mD.Based on the practice of petroleum exploration and development in Ordos Basin,the tight oil herein refers to the oil that accumulates in oil shale or interbedded tight sandstone reservoirs adjacent to source rocks and with surface-air permeability less than 0.3 mD.Generally,this accumulated oil has not yet experienced large-scale and long-distance migration,and ...
Published on Dec 1, 2012in Chinese Journal of Geochemistry
Xinglian Yang7
Estimated H-index: 7
(CAS: Chinese Academy of Sciences),
Yuanlong Zhao18
Estimated H-index: 18
(Guida: Guizhou University)
+ 1 AuthorsHong Yang2
Estimated H-index: 2
(Guida: Guizhou University)
The Jianshan section in Jianhe County, Guizhou Province, is a very important auxiliary section to the candidate stratotype at the boundary between Cambrian Series 2 and Series 3. Twenty four samples collected from the Jianshan section of the Kaili Formation were analyzed for the concentrations of trace element and rare-earth elements (REEs) by inductively coupled plasma mass spectrometry. The trace element and REE geochemical characteristics of the Kaili Formation at the Jianshan section show th...
Published on Nov 1, 2012in Organic Geochemistry 3.12
DUANYi11
Estimated H-index: 11
(CAS: Chinese Academy of Sciences)
Abstract Maling oilfield is one of the earliest discovered oilfields in the Ordos Basin. It is also a typical representative of oil reservoirs in fluvial deposits. However, due to the deficiency of geochemical study on the crude oils and source rocks, the interpretation of the oil origin is largely based on the geological situation. Maling crude oils (21) and source rocks (14) from the basin have been systematically analyzed. The distribution of the biomarkers indicates that the crude oils mainl...
Published on Sep 1, 2012in Chemical Geology 3.62
Guangping Xu11
Estimated H-index: 11
(CSU: Colorado State University),
Judith L. Hannah18
Estimated H-index: 18
(CSU: Colorado State University)
+ 2 AuthorsHolly J. Stein32
Estimated H-index: 32
(CSU: Colorado State University)
Abstract Trace elements such as U, Mo, Re, V and Ni in marine shales are commonly used to probe paleoenvironmental conditions. Trace elements may have either a detrital or seawater source, or both. The seawater contribution is often modelled from whole-rock sediment analyses. Using whole-rock trace element ratios as paleoredox proxies, however, presents limitations. In this study, we compare three different methods of digestion using Middle Triassic black shales from Svalbard and Svalis Dome, an...
Published on Sep 1, 2012in Chemie Der Erde-geochemistry 2.36
Jian Cao16
Estimated H-index: 16
(NU: Nanjing University),
Ming Wu1
Estimated H-index: 1
(NU: Nanjing University)
+ 4 AuthorsYing Zhang1
Estimated H-index: 1
(PetroChina)
Abstract Trace and rare earth element (REE) of Jurassic mudstones from the northern Qaidam Basin of northwest China were measured by inductively coupled plasma mass spectrometry (ICP-MS) analysis. The analytical results show that the trace element and REE concentrations are higher than in the average of the upper crust. Three aspects evolved: (i) the paleoclimate index, Σ(Fe + Mn + Cr + Ni + V + Co)/Σ(Ca + Mg + Sr + Ba + K + Na), varies between 0.27 and 1.14 indicating semi-arid to semi-moist co...
Published on Aug 1, 2012in International Journal of Coal Geology 5.33
Shifeng Dai49
Estimated H-index: 49
(CUMT: China University of Mining and Technology),
Yaofa Jiang12
Estimated H-index: 12
+ 8 AuthorsJianhua Zou8
Estimated H-index: 8
(CUMT: China University of Mining and Technology)
Abstract Aluminum-hydroxide (boehmite and diaspore)-, Ga-, REY (rare earth elements and Y)-, and Al-rich Pennsylvanian Taiyuan Formation coals have previously been found in the Jungar and Daqingshan Coalfields, Inner Mongolia, China. Gallium, REY, and Al are potentially extractable and usable elements in combustion residues derived from these coals. This paper reports new results on 50 bench samples of the No. 6 coal from the Guanbanwusu Mine, Jungar Coalfield, Inner Mongolia, and provides new d...
Published on Jul 1, 2012in Sedimentary Geology 3.24
Caineng Zou22
Estimated H-index: 22
(PetroChina),
Lan Wang8
Estimated H-index: 8
(PetroChina)
+ 2 AuthorsLianhua Hou13
Estimated H-index: 13
(PetroChina)
Abstract Deep-lacustrine transformation of sandy debrites into turbidites in the downslope direction is evident in the Upper Triassic Yanchang Formation of the Ordos Basin, central China. This facies trend is used as a template for predicting the distribution of reservoir facies of the Huaqing oilfield, which contains 100-million-tonnes of oil reserves. Based on examination of conventional cores from 30 wells, four major types of lithofacies have been recognized: (1) fine-grained massive sandsto...
Cited By18
Newest
Published on Nov 1, 2019in Marine and Petroleum Geology 3.54
Ruiqian Chen (China University of Petroleum), Guangdi Liu11
Estimated H-index: 11
(China University of Petroleum)
+ 1 AuthorsYushun Cao (China University of Petroleum)
Abstract Nitrogen isotope (δ 15 N) analysis has been used to evaluate depositional redox conditions in well-preserved sedimentary systems; however, fewer N-isotope studies have been performed to reconstruct the redox conditions in lacustrine shales. In this paper, we report the δ 15 N data from the Upper Triassic Chang 7 Shale of the Ordos Basin, North China. Sedimentary δ 15 N values are significantly higher in the Chang 7 3 and the lower part of the Chang 7 2 submembers (Zone A; average = 9.4 ...
Published on Aug 1, 2019in Journal of Petroleum Science and Engineering 2.89
Wenxue Han2
Estimated H-index: 2
(SDUST: Shandong University of Science and Technology),
Xiangchun Chang4
Estimated H-index: 4
(SDUST: Shandong University of Science and Technology)
+ 4 AuthorsSiqi Meng
Abstract The geochemical characteristics, genesis and accumulation mechanism of the pre-salt gases of Ordos Basin have been rarely studied in China. Components and carbon isotope values of pre-salt gases are investigated and compared with those of the Upper Paleozoic and post-salt gases. Homogenization temperatures and carbon isotope values of gases of the pre-salt fluid inclusions were also measured. Based on the geochemical parameters, combined with the geological conditions, the genesis and a...
Published in Geological Journal 1.95
Yan Wang (NU: Nanjing University), Jian Cao16
Estimated H-index: 16
(NU: Nanjing University)
+ -3 AuthorsTianming Shi (PetroChina)
Published on Jul 1, 2019in Journal of Asian Earth Sciences 2.76
Zhengjian Xu4
Estimated H-index: 4
(China University of Petroleum),
Luofu Liu9
Estimated H-index: 9
(China University of Petroleum)
+ 7 AuthorsYun Shu
Abstract The fact that high-quality lacustrine source rocks (generally shale and mudstone) control the formation and distribution of conventional and unconventional oil and gas reservoirs in lacustrine basins has been well-accepted in petroleum exploration and exploitation. Taking the Chang 7 lacustrine source rocks in the Ordos Basin as an example, several points having been reached are as follows. (1) The Chang 7 source rocks possess an excellent source rock potential, and the shales hold a be...
Published on Jun 12, 2019in Australian Journal of Earth Sciences 1.28
J. You (Northwest University (United States)), Y. Liu (Northwest University (United States))+ 3 AuthorsZ. Chen
AbstractEvidence for hydrothermal activity, such as siliceous rocks, iron dolomite layer deposits, and hydrothermal mineral combinations of ilmenite + pyrite + anhydrite, has been found in the high-quality source rocks from the Chang 7 layer in the Triassic Yanchang Formation from the southern margin of the Ordos Basin, China. In this paper, elemental geochemical analysis is carried out on a large number of samples collected from an outcrop geological section and drill core from the Chang 7 laye...
Published on May 1, 2019in Marine and Petroleum Geology 3.54
Guo Chen1
Estimated H-index: 1
(China University of Petroleum),
Wenzhe Gang1
Estimated H-index: 1
(China University of Petroleum)
+ 4 AuthorsQingyun Cao (PetroChina)
Abstract The Upper Triassic Chang 7 unit consists of more than 110 m of lacustrine sediments, including mudstone and shale, and it is considered to be the most important hydrocarbon source rock in the Ordos Basin. Power spectral, wavelet, evolutionary fast Fourier transform (FFT), and correlation coefficient analyses of the gamma ray (GR) and density (DEN) logging series from well Y56 in the Chang 7 unit reveal strong astronomical signals of long eccentricity (405 kyr), short eccentricity (100 k...
Published on May 1, 2019in Marine and Petroleum Geology 3.54
Delu Li1
Estimated H-index: 1
(Xi'an University of Science and Technology),
Rongxi Li6
Estimated H-index: 6
(Chang'an University)
+ 6 AuthorsFeng Xu1
Estimated H-index: 1
Abstract Lower Paleozoic shale is an important source rock and reservoir for gas in the northwestern Upper Yangtze Plate. The paleoenvironment, and its impact on organic matter enrichment of the shale, plays a vital role in the exploration and development of the resource. Based on the analysis of the results of total organic carbon (TOC), maceral examination, bitumen reflectance (Rb), major elements, trace elements, rare earth elements (REEs), and X-ray diffraction (XRD) of shale samples from th...
Published on Apr 1, 2019in Marine and Petroleum Geology 3.54
Yuhang Chen (Xi'an Shiyou University), Zengwu Zhu , Long Zhang (Xi'an Shiyou University)
Abstract Oil shale is an important form of unconventional resources. It is significant to determine the control factors on oil shale distribution. Abundant oil shale resources are hosted in the Member Chang 7–3 (Ch7-3), Triassic Yanchang Formation in southeastern Ordos Basin (NW China). This study was conducted to investigate the sedimentary environment, distribution and organic matter source of the Ch7-3 Oil shale by a combined study of outcrops, core data, organic and element geochemical indic...