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thermal simulation experiment of organic matter-rich shale and implication for organic pore formation and evolution

Petroleum Research 2017年第4期2卷 347-354页

作者： Zhongliang Ma Lunju Zheng Xuhui Xu Fang Bao Xiaolu Yu State Key Laboratory of Shale Oil and Gas Enrichment and Effective Development Jiangsu 214126China State Energy Center for Shale Oil Research and Development Jiangsu 214126China Sinopec Key Laboratory of Petroleum Accumulation Mechanisms Jiangsu 214126China Wuxi Research Institute of Petroleum Geology Sinopec Petroleum Exploration and Production Research InstituteJiangsu 214126China

A thermal simulation experiment of diagenesis,hydrocarbon generation and evolution of the organic matter-rich shale was carried out to investigate formation and evolution of organic pores under the constraint from immature,low mature,mature,high mature to overmature geological *** argon ion polishingefield emission scanning electron microscope was used to analyze microscopic features of original samples and simulated samples of various evolution *** showed organic pores could be formed during hydrocarbon generation from biochemical and hypothermal processes in the immature and low mature stages,and the shale shallow-buried depth might be favorable for preservation of organic pores;the generation and evolution of organic pores were of heterogeneity,and the maturity was not a decisive factor which controlled formation and development of organic pores,while the difference in physiochemical structure of organic matter played an important role in formation and evolution of organic pores;the organic pore development was obviously related with the retained oil,and the organic pores formed in the oil generation stage were easily filled by pyrolysis asphalt;organic contraction fractures/organic marginal pores might be important storage spaces for shale gas occurrence,and their development was mainly controlled by the physiochemical structure and evolution degree of organic matters when the chemical adsorbed organic matter was converted into the physical adsorbed organic matter and the free organic matter.

关键词： thermal simulation experiment Organic pores thermal evolution stage Heterogeneity Plane porosity Retained oil Shale

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Mechanisms of carbon isotopic fractionation in the process of natural gas generation: Geochemical evidence from thermal simulation experiment

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Petroleum Exploration and Development 2020年第5期47卷 1042-1054页

作者： PENG Weilong LIU Quanyou HU Guoyi LYU Yue ZHU Dongya MENG Qingqiang GUO Fengtao WANG Ruoli State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development SinopecBeijing 100083China Petroleum Exploration and Production Research Institute SinopecBeijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China The Eleventh Oil Extraction Plant PetroChina Changqing Oilfield CompanyQingyang 745000China

Low maturity coal samples were taken from the Ordos Basin to conduct gold tube thermal simulation experiment in a closed system,and the characteristics of the products were analyzed to find out the fractionation mechanism of carbon isotopes and the causes of abnormal carbon isotopic compositions of natural *** the heating rates of 2℃/h(slow)and 20℃/h(rapid),the low maturity coal samples of the Ordos Basin had the maximum yields of alkane gas of 302.74 mL/g and 230.16 mL/g,theδ13C1 ranges of-34.8‰to-23.6‰and-35.5‰to-24.0‰;δ13C2 ranges of-28.0‰to-9.0‰and-28.9‰to-8.3‰;andδ13C3 ranges of-25.8‰to-14.7‰and-26.4‰to-13.2‰,*** gas in the thermal simulation products of rapid temperature rise process showed obvious partial reversal of carbon isotope series at 550℃,and at other temperatures showed positive carbon isotope *** the two heating processes,theδ13C1 turned lighter first and then heavier,and the non-monotonic variation of theδ13C1 values is because the early CH4 is from different parent materials resulted from heterogeneity of organic matter or the carbon isotope fractionation formed by activation energy difference of early enriched 12CH4 and late enriched *** reversal of carbon isotope values of heavy hydrocarbon gas can occur not only in high to over mature shale gas(oil-type gas),but also in coal-derived *** thermal simulation experiment of toluene,it is confirmed that the carbon isotope value of heavy hydrocarbon gas can be reversed and inversed at high to over mature *** isotope fractionation effect caused by demethylation and methyl linkage of aromatic hydrocarbons may be an important reason for carbon isotope inversion and reversal of alkane gas at the high to over mature stage.

关键词： thermal simulation experiment natural gas carbon isotope composition fractionation mechanism low maturity coal aromatic hydrocarbon pyrolysis

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Assessment of recoverable oil and gas resources by in-situ conversion of shale——Case study of extracting the Chang 7_(3) shale in the Ordos Basin

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Petroleum Science 2022年第2期19卷 441-458页

作者： Lian-Hua Hou Xia Luo Sen-Hu Lin Yong-Xin Li Li-Jun Zhang Wei-Jiao Ma Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China National Energy Tight Oil&Gas R&D Center Beijing100083China School of Geosciences China University of PetroleumQingdaoShandong266580China

The purpose of this study is to investigate the entire evolution process of shales with various total organic contents(TOC)in order to build models for quantitative evaluation of oil and gas yields and establish methods for assessing recoverable oil and gas resources from in-situ conversion of organic matters in *** simulation experiments under in-situ conversion conditions were conducted on Chang 7_(3) shales from the Ordos Basin in a semi-open system with large *** results showed that TOC and R_(o) were the key factors affecting the in-situ transformation potential of *** remaining oil and gas yields increased linearly with TOC but inconsistently with R_(o).R_(o) ranged 0.75%—1.25%and 1.05%—2.3%,respectively,corresponding to the main oil generation stage and gas generation stage of shale in-situ *** a model to evaluate the remaining oil/gas yield with TOC and R_(o) was *** TOC of shale suitable for in-situ conversion should be greater than 6%,whereas its R_(o) should be less than 1.0%.Shales with 0.75%(R_(o))could obtain the best economic *** results provided a theoretical basis and evaluation methodology for predicting the hydrocarbon resources from in-situ conversion of shale and for the identification of the optimum“sweet spots”.The assessment of the Chang 7_(3) shale in the Ordos Basin indicated that the recoverable oil and gas resources from in-situ conversion of organic matters in shale are substantial,with oil and gas resources reaching approximately 450×10^(8) t and 30×10^(12)m^(3),respectively,from an area of 4.27×10^(4) km^(2).

关键词： Shale oil In-situ conversion processing thermal simulation experiment Hydrocarbon generation mechanism Hydrocarbon resource Ordos basin

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Pyrolysis of coal measure source rocks at highly to over mature stage and its geological implications

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Petroleum Exploration and Development 2020年第4期47卷 773-780页

作者： GAO Jinliang NI Yunyan LI Wei YUAN Yilin Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China

The influence of water on gas generation from humic type organic matter at highly to over mature stage was investigated with thermal simulation experiments at high temperature and *** result of the experiments indicates that the effect of water on gas generation was controlled by the thermal maturity of organic *** could enhance gas generation and increase hydrocarbon gas yields significantly at over mature stage of humic type organic *** isotopic compositions of coal-derived gases generated at highly to over mature stage were mainly controlled by thermal maturity of source rocks,but also affected by formation *** and over mature coal measure source rocks are widely distributed in *** hydrocarbon gas generation capacity of coal measure source rocks and resource potential of coal-derived gases in deep formations would be significantly enhanced assuming that formation water could be involved in the thermal cracking of highly to over mature organic matter in real geological settings.

关键词： coal measure source rocks high-over maturation coal-derived gas thermal simulation experiment

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