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Paleoenvironmental conditions, organic matter accumulation, and unconventional hydrocarbon potential for the Permian Lucaogou Formation organic-rich rocks in Santanghu Basin, NW China

Published on Jan 1, 2018in International Journal of Coal Geology 5.33
· DOI :10.1016/j.coal.2017.11.012
Shaohua Zhang1
Estimated H-index: 1
(Northwest University (United States)),
Chiyang Liu1
Estimated H-index: 1
(Northwest University (United States))
+ 6 AuthorsYuzhao Guan1
Estimated H-index: 1
(Northwest University (United States))
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Abstract
Abstract Organic-rich rocks have received increasing attention for they are essential for evaluating hydrocarbon potential and unravelling the interaction between Earth surface environments and the biosphere. In this paper, we performed a combination of mineralogical, inorganic and organic geochemical analyses on a 200-m core of the Permian Lucaogou Formation organic-rich rocks obtained from Santanghu Basin, NW China, to investigate paleoenvironmental conditions, organic matter accumulation, and hydrocarbon potential. The redox- and salinity-sensitive proxies (e.g. V/Cr, V/(V + Ni) and Sr/Ba, Rb/K, B/Ga, and B content), together with the wide distribution of pyrite and carbonate minerals in these dark, thinly laminated organic-rich rocks, suggest that dysoxic-anoxic, brackish-saline, alkaline conditions prevailed during the deposition of the Lucaogou Formation in the Santanghu Basin. The occurrence of hydrothermal minerals, including strontianite and barite, and enrichments of B (up to 158.0 ppm), Mn (up to 1291 ppm), and certain incompatible elements (Li (up to 923 ppm), Rb (up to 848 ppm), Sr (up to 1760 ppm), Hf (up to 12.7 ppm)) as well as Ni vs. Co vs. Zn and Fe vs. Mn vs. (Cu + Co + Ni) × 10 ternary diagrams demonstrate that the Lucaogou Formation received hydrothermal input during deposition, which suggests hydrothermalism was the source of brine that has caused the salinization of the water column. The positive correlation of HI value and TOC content, together with redox-sensitive proxies, illustrates primary productivity in surface water and preservation in anoxic bottom water collectively contributed to the enrichment of organic matter. Moreover, the positive correlation between silicate mineral content and TOC content and the negative correlation between carbonate content and TOC content suggest that terrigenous input as the main source of nutrients promoted organic matter accumulation, while carbonate constituents acted as a diluent to organic matter accumulation during deposition of the Lucaogou Formation. The faint positive correlation between TOC content and hydrothermal intensity indicator (Cr/Zr) seems to indicate that hydrothermal fluids may provide an additional source of nutrients for organic matter accumulation. In addition, the oil generation capacity of Lucaogou Formation, with abundant oil-prone organic matter (Type I/II 1 kerogen with HI values ranging from 421.18–918.41 mg HC/g TOC) in the early mature to mature stage (T max values ranging from 435 to 451 °C), is considerable. The Rock-Eval oil saturation index (OSI S 1 /TOC × 100) values range from 6.04–164.07 mg HC/g TOC, suggesting the Lucaogou Formation contains producible oil. The high brittle mineral (including quartz and carbonates) contents (> 50% wt%) and traces of clay minerals (
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  • Citations (9)
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References114
Newest
Published on Jun 1, 2017in AAPG Bulletin 2.68
Yuanjia Han4
Estimated H-index: 4
,
Brian Horsfield39
Estimated H-index: 39
+ 2 AuthorsSylvain Bernard25
Estimated H-index: 25
(CNRS: Centre national de la recherche scientifique)
Petroleum is retained in shales either in a sorbed state or in a free form within pores and fractures. In shales with oil resource potential, organic matter properties (i.e., richness, quality, and thermal maturity) control oil retention in general. In gas shales, organic pores govern gas occurrence. Although some pores may originate via secondary cracking reactions, it is still largely unclear as to how these pores originate. Here we present case histories mainly for two classic shales, the Mis...
18 Citations Source Cite
Published on Apr 20, 2017in Energy & Fuels 3.02
Guohui Chen7
Estimated H-index: 7
,
Shuangfang Lu11
Estimated H-index: 11
+ 5 AuthorsJiao Wang1
Estimated H-index: 1
Qualitative and quantitative evaluations of resource potential are of significant importance for both exploration and exploitation of shale oil. We investigate the shale oil resource potential in E2s4L (the lower submember of the fourth member of the Paleogene Shahejie Formation) of Damintun Sag by both qualitative and quantitative methods. From the viewpoint of qualitative evaluation, it is reasonable to hope that the target shale, with adequate oil-prone organic matter (OM) in the peak and lat...
4 Citations Source Cite
Published on Apr 1, 2017in International Journal of Coal Geology 5.33
Bo Liu2
Estimated H-index: 2
(Ministry of Science and Technology),
Achim Bechtel3
Estimated H-index: 3
+ 3 AuthorsXuan Chen1
Estimated H-index: 1
(PetroChina)
Abstract The non-marine Santanghu Basin in northwest China hosts one of the richest and thickest Permian lacustrine source rock intervals in the world. Conventional oil in Jurassic sandstone reservoirs and tight oil in the tuffaceous Permian Tiaohu Formation were sourced from mudrocks in the underlying second member of Lucaogou Formation, which also have tight oil potential proved by recent commercial discoveries. Based on inorganic and organic geochemistry, organic petrography, and stable isoto...
14 Citations Source Cite
Published on Mar 1, 2017in Marine and Petroleum Geology 3.54
Jian-HuaHE13
Estimated H-index: 13
(China University of Geosciences),
Wenlong Ding14
Estimated H-index: 14
(China University of Geosciences)
+ 3 AuthorsYaxiong Sun4
Estimated H-index: 4
(China University of Geosciences)
Abstract The Es 3 L (lower sub-member of the third member of the Eocene Shahejie Formation) shale in the Jiyang Depression is a set of relatively thick and widely deposited lacustrine sediments with elevated organic carbon, and is considered to be one of the most important source rocks in East China. We can determine the mineralogy, organic and inorganic geochemistry of the Es 3 L shale and calculate paleoclimate indexes by using multiple geochemical proxies based on organic chemistry (total org...
16 Citations Source Cite
Published on Mar 1, 2017in Earth-Science Reviews 9.53
Anastasia G. Ilgen9
Estimated H-index: 9
(SNL: Sandia National Laboratories),
Jason E. Heath10
Estimated H-index: 10
(SNL: Sandia National Laboratories)
+ 7 AuthorsRoberto Suarez-Rivera1
Estimated H-index: 1
Fine-grained sedimentary rocks – namely mudrocks, including their laminated fissile variety — shales – make up about two thirds of all sedimentary rocks in the Earth's crust and a quarter of the continental land mass. Organic-rich shales and mudstones are the source rocks and reservoirs for conventional and unconventional hydrocarbon resources. Mudrocks are relied upon as natural barriers for geological carbon storage and nuclear waste disposal. Consideration of mudrock multi-scale physics and m...
18 Citations Source Cite
Published on Mar 1, 2017in Nature 43.07
Matthew S. Dodd2
Estimated H-index: 2
(UCL: University College London),
Dominic Papineau20
Estimated H-index: 20
(UCL: University College London)
+ 5 AuthorsCrispin T. S. Little29
Estimated H-index: 29
(University of Leeds)
Perhaps the earliest known signs of life have been found in Quebec, where features such as haematite tubes suggest that filamentous microbes lived around hydrothermal vents at least 3,770 million years ago.
113 Citations Source Cite
Published on Feb 1, 2017in Journal of Asian Earth Sciences 2.76
Rumana Yeasmin1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences),
Daizhao Chen21
Estimated H-index: 21
(CAS: Chinese Academy of Sciences)
+ 3 AuthorsChuan Guo4
Estimated H-index: 4
(CAS: Chinese Academy of Sciences)
Abstract The organic-rich sediments were widely deposited over the entire Yangtze Block during the Early Cambrian (late Nemakit-Daldynian to Botomian). In the mid-upper Yangtze region, northeastern Guizhou, South China, they comprise, in ascending order, the Niutitang, Jiumenchong and lower Bianmachong formations which are dominated by black shales except the middle one characterized by interbedded shales-limestones. Three third-order depositional sequences are identified in the two studied sect...
11 Citations Source Cite
Published on Feb 1, 2017in Organic Geochemistry 3.12
Yu Song4
Estimated H-index: 4
(JLU: Jilin University),
Achim Bechtel25
Estimated H-index: 25
+ 3 AuthorsQingtao Meng9
Estimated H-index: 9
(JLU: Jilin University)
Abstract The Laoheishan Basin located in northeastern China is filled with non-marine coal- and “oil shale” (oil-prone mudstone) sediments of the Lower Cretaceous Muling Formation. Based on petrological, mineralogical and geochemical methods, the depositional environment during organic matter (OM) accumulation is investigated for the first time. The coal is subbituminous in rank. Petrological and bulk geochemical data indicate sapropelic coal, deposited in low-lying mire under freshwater conditi...
4 Citations Source Cite
Published on Jan 1, 2017in Palaeogeography, Palaeoclimatology, Palaeoecology 2.62
Yangfang Li1
Estimated H-index: 1
(Lanzhou University),
Tongwei Zhang22
Estimated H-index: 22
(University of Texas at Austin)
+ 1 AuthorsDeyong Shao1
Estimated H-index: 1
(Lanzhou University)
Abstract The main controlling factors of organic matter accumulation in the Upper Ordovician Wufeng–Lower Silurian Longmaxi Formations are complex and remain highly controversial. This study investigates the vertical variation of total organic carbon (TOC) content as well as major and trace element concentrations of four Ordovician–Silurian transition sections from the Upper Yangtze Platform of South China to reconstruct the paleoenvironment of these deposits and to improve our understanding of ...
18 Citations Source Cite
Published on Dec 1, 2016in Sedimentary Geology 3.24
Chengcheng Ye4
Estimated H-index: 4
(CAS: Chinese Academy of Sciences),
Yibo Yang9
Estimated H-index: 9
(CAS: Chinese Academy of Sciences)
+ 1 AuthorsWeilin Zhang13
Estimated H-index: 13
(CAS: Chinese Academy of Sciences)
Abstract The Qaidam Basin, located on the northeastern Tibetan Plateau and containing Cenozoic sediments with a maximum thickness of ~ 12,000 m, is an ideal place to study the phased uplift of the NE Tibetan Plateau and regional climate change. The estimation of the paleosalinity of sedimentary environments not only helps to evaluate the evolution of lakes in this region but offers insights into contemporaneous climate change. We present detailed geochemical and mineralogical investigations from...
13 Citations Source Cite
Cited By9
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Published on Jul 1, 2019in Journal of Petroleum Science and Engineering 2.89
Min Wang9
Estimated H-index: 9
(China University of Petroleum),
Zhiqiang Guo1
Estimated H-index: 1
(China University of Petroleum)
+ 6 AuthorsGuohui Chen7
Estimated H-index: 7
(China University of Petroleum)
Abstract With the consumption of conventional petroleum resources, the exploration and development (EP however, EP shale oil flows are also being produced from shale fractures. In general, the progress of exploration for lacustrine shale oil in China has been unsatisfactory in recent years. We believe that shale oil mobility and shale fracability are vital factors for shale oil exploitation, which should be strengthened and further studied.
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Published on Jan 1, 2019
Bodhisatwa Hazra7
Estimated H-index: 7
,
Bodhisatwa Hazra6
Estimated H-index: 6
(CSIR: Council of Scientific and Industrial Research)
+ 2 AuthorsAshok K. Singh7
Estimated H-index: 7
The basic pyrolysis techniques used for source-rock geochemical analysis are generally simple and can be interpreted in a straightforward way. However, some of the data generated can be misleading and lead to confused interpretations if not properly assessed. This chapter discusses the different aspects of source-rock evaluation using the commonly used Rock-Eval technique on a step-by-step basis. Here, the impact for several factors on key Rock-Eval derived measurements, viz. particle crush-size...
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Published on Jan 1, 2019
Bodhisatwa Hazra7
Estimated H-index: 7
,
David Wood55
Estimated H-index: 55
+ 2 AuthorsAshok K. Singh7
Estimated H-index: 7
Source Cite
Published on Jul 1, 2018in Organic Geochemistry 3.12
Bin Cheng5
Estimated H-index: 5
(CAS: Chinese Academy of Sciences),
Jianbing Xu1
Estimated H-index: 1
(CAS: Chinese Academy of Sciences)
+ 3 AuthorsZewen Liao12
Estimated H-index: 12
(CAS: Chinese Academy of Sciences)
Abstract Studies of occluded oxygen-bearing compounds inside kerogen are scarce, although such studies are important in understanding early-stage transformation of organic matter. A relatively low-maturity kerogen from the late Permian mudstone of the Lucaogou Formation of the Santanghu Basin, northwestern China, was successively extracted with n -hexane, acetone and dichloromethane to release the adsorbed components, and the extracted kerogen was treated with a mild oxidation reagent H 2 O 2 to...
1 Citations Source Cite
Published on Jun 1, 2018in Fuel 5.13
Guoheng Liu5
Estimated H-index: 5
(China University of Petroleum),
Bo Liu1
Estimated H-index: 1
(Ministry of Science and Technology)
+ 5 AuthorsLei Chen30
Estimated H-index: 30
(China University of Petroleum)
Abstract A series of qualitative descriptions and quantitative analyses was used to determine the lithofacies characteristics and hydrocarbon distribution pattern of Lucaogou Formation fine-grained sedimentary rocks in the Santanghu Basin. The qualitative descriptions include core description, petrographic thin section observation, fluorescence observation, cathode luminescence observation and scanning electron microscope (SEM) observation. The quantitative analyses include X-ray diffraction, to...
1 Citations Source Cite
Published on Apr 1, 2018in Fractals
Hexin Huang1
Estimated H-index: 1
(Northwest University (United States)),
Lei Chen30
Estimated H-index: 30
(China University of Petroleum)
+ 7 AuthorsBin Luo1
Estimated H-index: 1
(Northwest University (United States))
In order to better understand the impact of fractal features of pore-throat structures on effective physical properties of tight gas sandstones, this paper carried out constant-rate mercury injection tests, gas–water permeability analyses, helium-based porosity and nitrogen pulse decay permeability measurements, and SEM and casting thin-section analyses on 20 sandstone samples of the Shihezi Formation from 16 wells of the Sulige Gas Field in the Ordos Basin, China. The fractal dimensions of pore...
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