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Petrology and organic geochemistry of the Baishaping and Damaidi Devonian cutinitic liptobioliths,west of the Kangdian Uplift,China

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Petroleum Science 2022年第5期19卷 1978-1992页

作者： Dao-Fu Song Tie-Guan Wang Ping Li Mai Zhang An-Liang Liu Jia-Dong Yan State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China

Devonian cutinitic liptobiolith is a special type of coal formed during the early evolutionary stage of land plants.The Baishaping and Damaidi Devonian coals are notable for their distinct papery,sheet-like texture,and unusually high cutinite content(>50%),belonging to typical cutinitic liptobiolith.They are bituminous coals and have a suppressed vitrinite reflectance.Compared with typical typeⅢkerogen,these liptobioliths are characterized by extremely high yields of volatile matter and high hydrogen contents owing to their enhanced cutinite contents.As indicated by pyrolysis and elemental analysis results,the Devonian cutinitic liptobioliths are dominated by typeⅠ-Ⅱkerogens and have an excellent potential to generate liquid hydrocarbons.The Baishaping cutinitic liptobioliths are mainly composed of ribbon-like thick-walled cutinites,with small amounts of thin-walled type.Vitrinite is only present in trace amounts and is dominated by telinite.Meanwhile,the Damaidi Devonian coals are primarily composed of ribbon-like thin-walled cutinites,followed by collotelinites which are usually sandwiched by cutinites.The different petrological characteristics of the Baishaping and Damaidi liptobioliths might indicate a structural variation in the coal-forming plant cuticles and two distinct coal-forming conditions.The molecular bio markers in the Devonian coals are mainly composed of C_(18)-C_(20)tetracyclic diterpenoids,which are assumed to be the dominant soluble constituent of the Devonian land-plant cuticles and might have played an important role in early land plant radiation.Other molecules include aromatic tetracyclic diterpenoids,3-5 ring polycyclic aromatic hydrocarbons and their methylated counterparts,and C_(16)-and C_(18)-monocarboxylic acids.n-Alkanes are present only in small amounts.The molecular composition of the cutinite-rich coals is unexpected,because cuticular waxes are one of the most important sources of n-alkanes.In general,the petrology and geochemistry of the Devonian cutinitic liptobiolith indicate

关键词： Coal chemistry macerals Hydrocarbon potential Plant cuticles Tetracyclic diterpenoids

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Organic matter pores in the chang 7 lacustrine shales from the Ordos Basin and its effect on reflectance measurement

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Petroleum Science 2023年第1期20卷 60-86页

作者： Peng Pang Hui Han Xiu-Cheng Tan Shi-Meng Ren Chen Guo Lin Xie Ling-Li Zheng Hai-Hua Zhu Yuan Gao Yun-Hui Xie School of Geoscience and Technology Southwest Petroleum UniversityChengduSichuan610500China Natural Gas Geology Key Laboratory of Sichuan Province Southwest Petroleum UniversityChengduSichuan610500China Shale Gas Industry Development Institute of Sichuan Province ChengduSichuan610500China The First Branch Mud Logging Company CNPC Bohai Drilling Engineering Co.Ltd.Tianjin300457China State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Southwest Petroleum UniversityChengduSichuan610500China Beijing Center for Physical and Chemical Analysis Beijing100089China Nursing College Guizhou University of Traditional Chinese MedicineGuiyangGuizhou520002China

To quantify the pore characteristics of various macerals in Chang 7 lacustrine shales,macerals were effectively identified according to their optical and morphological characteristics,and the nanoscale pore structure of macerals was observed by scanning electron microscope.Meanwhile,the reflectances of different positions in the same pieces of vitrinite or solid bitumen with heterogeneous pores development were measured.The results showed that the average contents of sapropelinite,liptinite,vitrinite,inertinite and solid bitumen are 42.7%,8.7%,13.6%,13.8% and 21.2%,respectively,which suggests that the source of the organic matter of the Chang 7 shales is a mixed source input.The organic pores of Chang 7 shales are enriched,and the pore shapes are mostly round or elliptical.The pore size of organic pores has a wide distribution,mainly concentrate in the range of 100-400 nm,and the average plane porosity of organic pores is 10.13%.The size order of the organic pores in various macerals is:solid bitumenfusinite>bituminite>solid bitumen>vitrinite>liptinite.OM pores are mainly contributed by bituminite,solid bitumen and fusinite.The plane porosity of bituminite increases with maturity.In the process of thermal evolution,the plane porosity of fusinite is distributed in the two ranges of 20%-28% and 1%-7%.The former is mainly the primary pores of the fusinite itself,and the latter is the secondary pores formed in the thermal evolution.As for the organic pores of other macerals,no obvious thermal evolution law was found.Meanwhile,the surface imperfections of vitrinite or solid bitumen is enhanced by the enrichment of organic pores(an increase in pore size or pore number),which may result in the underestimation of their reflectances.

关键词： Ordos Basin Chang 7 member OM pore macerals Differential developmental characteristics Reflectance

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Compositional and Structural Study of macerals in Coals and Source Rocks Using SIMS

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International Journal of Mining Science and Technology 1997年第1期18卷 11-18页

作者：刘大锰金奎励毛鹤龄

The authors applied the Secondary Ion Mass Spectrometry (SIMS) technique to the analysis of compositions and structures of vitrinites fusinites, fusinites bitumens and graptolites in the hydrocarbon source rocks with different maturities dscribed their SIMS spectral characteristics and found that different macerals have differnt spectra which, reflected the compositional and structural differences of macerals. Moreover, the change bod of parameter CH2+/CH3+ can be used for the evaluation of thermal evolution regularity of macerals in the hydrocarbon source rocks The study results show that the SIMS technique is a powerful means for microara analysis of macerals in coals and source rocks. It is certain that the study level of macerals can be raised by detailed study of SIMS results of SIMS results of macerals.

关键词： macerals of coals and source rocks chemical composition and structure Secondary Ion Mass Spectrometry

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Coal petrology characteristics of middlings from Qianjiaying fat coal mine

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International Journal of Mining Science and Technology 2013年第5期23卷 777-782页

作者： Zou Wenjie Cao Yijun Zhang Zhijun Liu Jiongtian School of Chemical Engineering and Technology China University of Mining & Technology National Engineering Research Center of Coal Preparation and Purifcation China University of Mining & Technology School of Chemical and Environmental Engineering China University of Mining & Technology

The objective of this paper is to evaluate the coal petrology characteristics of slack middlings(13–0.5 mm)of dense media separation and flotation middlings from Qianjiaying fat coal preparation plant.Phase composition,macerals distribution,microlithotype and mineral occurrence of the two middlings were studied by XRD analysis and polarized light microscopy observation.macerals distribution and wettability of the float-and-sink products separated from the middlings after grinding was investigated to determine the liberation degree.Studies show that there are more vitrinite and mineral,but less inertinite in slack middlings than in flotation middlings.macerals associated with mineral in slack middlings is 69.85%,by volume,which is 17.86%higher than that in flotation middlings.Minerals in slack middlings are dominated by pyrite and clay,which are disseminated with the diameter less than2 lm.The main mineral in flotation middlings is clay with size range of 2–20 lm.Single macerals in the slack middlings are diffcult to liberate due to the fne-grained minerals.After grinding,macerals associated with minerals in the slack middlings decrease to 46.73%,by volume,which is higher than in flotation middlings by 25.89%,by volume.For slack middlings with poor liberation degree,density fractions below1.8 g/cm3is hydrophobic with contact angle above 71.5°.For the well liberated flotation middlings,there is signifcant wettability difference among the float-and-sink products.This research is the theoretical basis to realize re-separation of middlings.

关键词： Middlings macerals Mineral liberation Wettability

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On bacterial role in hydrocarbon generation mechanism,Banqiao Sag

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Science China Chemistry 1995年第9期38卷 1123-1134页

作者：王铁冠钟宁宁侯读杰黄光辉于志海杨池银廖前进 Geosciences Department University of PetroleumBeijing 102200China Petroleum Geochemistry Laboratory Jianghan Petroleum InstituteJingsha 434102China Geological Exploration & Development Institute Dagang Oil FieldTianjin 300280China

Terrestrial organic matter is a main primary source material for oil and gas generation in theEogene Shahejie Formation in Banqiao Sag,bacterial degradation and reworking of sedimentary organic matterwould be conducive to the enhancement of its sapropelification level and to the early generation of immatureoil.Bacteria-derived short-chain alkanes are a major material base for the light hydrocarbon formation ofcondensate and crude oil in Banqiao Sag,certain thermal maturation,formation temperature and pressure areexternal conditions for the condemate formation.The establishment of hydrocarbon generation model shouldbe favorable to the resource prediction of deep-lying high-mature and shallow-lying immature oils and gases.

关键词： source inputs hydrogen-rich macerals mineral-bituminite groundmass hydrocarbon generation model.

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Spontaneous combustion liability of coal and coal-shale: a review of prediction methods

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International Journal of Coal Science & Technology 2019年第2期6卷 151-168页

作者： M.Onifade B.Genc The School of Mining Engineering University of the Witwatersrand P.O. WITS Johannesburg 2050 South Africa

This study presents a review of the various methods to predict the spontaneous combustion liability of coal and coal-shale. The relative propensity of coal to undergo self-heating can be established by different methods. These methods are well established in their usage, but the fact that no particular test method has become a standard to predict the spontaneous combustion liability indicates that doubt still exists as to the validity of all of them. The underlying principle of all the tests is that the more readily the coal undergoes exothermic oxidation, the more liable it is to self-heat. Comprehensive studies that centres on the international position on research being conducted by academics, different research institutes and industries on spontaneous combustion of coal and coal mine fires were evaluated. Relationships between the geochemical analysis (proximate and ultimate analysis, forms of sulphur, petrographic properties, X-ray diffraction and X-ray fluorescence) and spontaneous combustion testing methods (numerical and experimental approaches) used to predict the spontaneous combustion liability of coal were reviewed. The combination of these tests provides a better understanding of the mechanism that controls the spontaneous combustion phenomena. However, irrespective of the extensive studies that have been conducted over time, spontaneous combustion is still a major problem in the coal value chain.

关键词： Coalfields Spontaneous combustion liability macerals Numerical and geochemical analysis

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Geochemistry and Organic Petrography of Jordanian Sultani Oil Shale

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Open Journal of Geology 2016年第10期6卷 1209-1220页

作者： Hani Alnawafleh Khalid Tarawneh George Siavalas Kimon Christanis Andreas Iordanidis Department of Mining and Mineral Engineering Al-Hussein Bin Talal University Ma’an Jordan Department of Civil Engineering Isra University Amman Jordan Department of Geology University of Patras Patras Greece Shell Global Solutions International B.V Hague The Netherlands Department of Geotechnology and Environmental Engineering Technological Educational Institute (TEI) of Western Macedonia Kila Kozani Greece

The Sultani oil shale (OS) deposit is considered as a major fossil fuel source in Jordan. Applying various petrographic and geochemical techniques, this paper aims to study the Sultani OS geochemical and organic petrographic features. Results show that Sultani OS is a bituminous limestone consisting of very fine-grained matrix with rippled micro-laminated texture and muddy material of cryptocrystalline micrite. The rock is rich in Cretaceous microfossil shells filled in organic matter (OM). The fillingOMis bitumen of the migrabitumen type. TheOMcontent reaches up to 17 wt.% with high oil-yielding capacity (up to 12 wt.%). High TOC values suggest that the Sultani OS has a very good source rock potential. Organic petrography shows lowOMmaturity level and reveals two varieties of vitrinite, namely primary and oxidized vitrinite. The latter is derived from terrestrial plant tissues. Additionally, liptinite macerals including alginite and to a lesser extent cutinite, also participate. Various diagenetic features such as pyrite replacement and bitumen thermal alteration have been recorded. Results suggest that Sultani OS is a marinite formed under marine conditions with limited contribution of terrestrialOMinput.

关键词： Oil Shale Jordan Bitumen Organic Matter Vitrinite Reflectance macerals

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Investigation on the Microstructure Features of Bump-Prone Coal

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地学前缘 2009年第S1期16卷 57-57页

作者： Yixin Zhao,Yaodong Jiang,Jie Zhu State Key Lab of Coal Resources and Safe Mining,China University of Minining and Technology(Beijing),Beijing 100083, China.

A series of experiments,using X-ray diffraction, electronic microscope investigation and SEM observation,are carried out to investigate the microstructure characteristics of bump-prone coal. The samples are from four coal seams in two different coal mines,which compose of No.7,No.9 and No.12 coal seams in Zhaogezhuang mine and No.11 seam in Xinzhouyao mine.The microstructure parameters of coal are adopted to calculate the bump liability of

关键词： coal bump liability microstructure XRD macerals electronic microscope

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