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Evolution of nC_(16)H_(34)-water-mineral systems in thermal capsules and geological implications for deeply-buried hydrocarbon reservoirs

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Geoscience Frontiers 2022年第2期13卷 139-158页

作者： Guang-Hui Yuan Zi-Hao Jin Ying-Chang Cao Ke-Yu Liu Jon Gluyas Yan-Zhong Wang Ke-Lai Xi Key Laboratory of Deep Oil and Gas School of GeosciencesChina University of PetroleumQingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyNo.62Fuzhou South RoadQingdao 266071China Department of Earth Sciences Durham UniversityDurham DH13LEUK

organic-inorganic interactions between hydrocarbons and most minerals in deeply buried reservoirs remain *** this study,gold capsules and fused silica capillary capsules(FSCCs)with different com-binations of nC_(16)H_(34),water(distilled water,CaCl_(2) water)and minerals(quartz,feldspar,calcite,kaolinite,smectite,and illite)were heated at 340℃ for 3-10 d,to investigate the evolution and reaction pathways of the organic-inorganic interactions in different hot *** heating,minerals exhibited little alteration in the anhydrous *** alterations,how-ever,occurred obviously in the hydrous *** inorganic components affected nC_(16)H_(34) degra-dation ***,water promoted the free-radical thermal-cracking reaction and step oxidation reaction but suppressed the free-radical cross-linking *** impact of CaCl_(2) water on the nC_(16)H_(34) degradation was weaker than the distilled water as high Ca^(2+)concentration suppressed the formation of free *** presence of different waters also affects the impact of different minerals on nC_(16)H_(34) degradation,via its impact on mineral *** the anhydrous nC_(16)H_(34)-mineral systems,calcite and clays catalyzed generation of low-molecular-weight(LMW)alkanes,particularly the ***,feldspar,and calcite catalyzed generation of high-molecular-weight(HMW)alkanes and PAHs,whereas clays catalyzed the generation of LMW alkanes and mono-bicyclic aromatic hydrocarbons(M-BAHs).In the hydrous nC_(16)H_(34)-distilled water-mineral systems,all minerals but quartz promoted nC_(16)H_(34) degra-dation to generate more LMW alkanes,less HMW alkanes and *** the nC_(16)H_(34)-CaCl_(2) water-mineral systems,the promotion impact of minerals was weaker than that in the systems with distilled *** study demonstrated the generation of different hydrocarbons with different fluorescence colors in the different nC_(16)H_(34)-water-mineral systems after heating for t

关键词： nC_(16)H_(34)-water-mineral systems organic-inorganic interactions Hydrocarbon degradation Mineral alteration Deeply buried hot reservoirs

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Iron Speciation of Mud Breccia from the Dushanzi Mud Volcano in the Xinjiang Uygur Autonomous Region,NW China

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2201-2213页

作者： XU Wang ZHENG Guodong MA Xiangxian Danielle FORTIN David R.HILTON LIANG Shouyun CHEN Zhi HU Guoyi Key Laboratory of Petroleum Resources Gansu Province/Key Laboratory of Petroleum Resources ResearchInstitute of Geology and GeophysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Earth and Environmental Sciences University of Ottawa25 Templeton St.OttawaOntarioK1N 6N5Canada Scripps Institution of Oceanography University of California San DiegoLa JollaCA 92093-0244USA Key Laboratory of Mechanics on Disaster and Environment in Western China(Lanzhou University) Ministry of EducationLanzhou 730000China CEA Key Laboratory of Earthquake Prediction(Institute of Earthquake Forecasting) China Earthquake AdministrationBeijing 100036China Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China

organic-inorganic interactions occurring in petroleum-related mud volcanoes can help predict the chemical processes that are responsible for methane emissions to the atmosphere. Seven samples of mud breccia directly ejected from one crater were collected in the Dushanzi mud volcano, along with one argillite sample of the original reddish host rocks distal from the crater, for comparison purposes. The mineral and chemical compositions as well as iron species of all samples were determined using XRD, XRF and M?ssbauer spectroscopy, respectively. The results indicate that a series of marked reactions occurred in the mud volcano systems, more specifically in the mud breccia when compared to the original rocks. Changes mainly included:(1) some conversion of clay minerals from smectite into chlorite and illite, and the precipitation of secondary carbonate minerals such as calcite and siderite;(2) silicon depletion and significant elemental enrichment of iron, manganese, magnesium, calcium and phosphorus; and(3) transformation of iron from ferric species in hematite and smectite into ferrous species in siderite, chlorite and illite. These geochemical reactions likely induced the color changes of the original reddish Neogene argillite to the gray or black mud breccia, as a result of reduction of elements and/or alteration of minerals associated with the oxidation of hydrocarbons. Our results also suggest that greenhouse gases emitted from the mud volcanoes are lowered through a series of methane oxidation reactions and carbon fixation(i.e., through carbonate precipitation).

关键词： mud volcano mud breccias iron species organic-inorganic interactions greenhouse gas

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