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Impact of volcanism on the formation and hydrocarbon generation of organic-rich shale in the Jiyang Depression, Bohai Bay Basin, China

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Petroleum Science 2024年第3期21卷 1539-1551页

作者： Jia-Hong Gao Xin-Ping Liang Zhi-Jun Jin Quan-You Liu Chang-Rong Li Xiao-Wei Huang Ju-Ye Shi Peng Li State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Efficient Development Institute of EnergyPeking University Petroleum Exploration and Production Research Institute SINOPECBeijing100871 China School of Energy Resources China University of Geosciences Beijing100083 China

Globally,most organic-rich shales are deposited with volcanic ash *** ash,a source for many sedimentary basins,can affect the sedimentary water environment,alter the primary productivity,and preserve the organic matter(OM)through physical,chemical,and biological *** an increasing number of breakthroughs in shale oil exploration in the Bohai Bay Basin in recent years,less attention has been paid to the crucial role of volcanic impact especially its influence on the OM enrichment and hydrocarbon ***,we studied the petrology,mineralogy,and geochemical characteristics of the organic-rich shale in the upper submember of the fourth member(Es_(4)^(1))and the lower submember of the third member(Es_(3)^(3))of the Shahejie Formation,aiming to better understand the volcanic impact on organic-rich shale *** results show that total organic carbon is higher in the upper shale intervals rich in volcanic ash with enriched light rare earth elements and moderate Eu *** indicates that volcanism promoted OM formation before or after the *** positive correlation between Eu/Eu*and Post-Archean Australian Shale indicates hydrothermal activity before the volcanic *** plane graph of the hydrocarbon-generating intensity(S1+S2)suggests that the heat released by volcanism promoted hydrocarbon ***,the nutrients carried by volcanic ash promoted biological blooms during Es_(4)^(1 )and Es_(3)^(3) deposition,yielding a high primary *** blooms consume large amounts of oxygen and form anoxic environments conducive to the burial and preservation of ***,this study helps to further understand the organic-inorganic interactions caused by typical geological events and provides a guide for the next step of shale oil exploration and development in other lacustrine basins in China.

关键词： Volcanic ash hydrocarbon generation Organic-rich shale Shahejie Formation Jiyang Depression

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Geochemical Characteristics and hydrocarbon generation Modeling of the Paleocene Source Rocks in the Jiaojiang Sag,East China Sea Basin

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Journal of Earth Science 2024年第2期35卷 642-654页

作者： Chuang Lei Shiyan Yin Jiaren Ye Jingfu Wu Zhaosheng Wang Bin Gao Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources North China University of Science and TechnologyTangshan063210China Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesMinistry of EducationWuhan430074China CNOOC Research Institute Ltd Beijing100028China

Jiaojiang sag in the East China Sea Basin is at the earlier exploration stage,where characterizing hydrocarbon generation of source rocks is important to understand oil-gas exploration *** geochemical and basin modeling analysis,hydrocarbon generation capacity and process of the Paleocene E_(1)y,E_(1)l and E_(1)m formations were *** show that E_(1)y and E_(1)l mudstones are high-quality source rocks with Type Ⅱ kerogen,which is dominated by both aquatic organisms and terrestrial higher plants deposited in sub-reduced environment.E_(1)m mudstone interbedded with thin carbonaceous mudstone and coal is poor-quality source rock with Type Ⅲ kerogen,whose organic matter was originated from terrestrial higher plants under oxidized *** by burial and maturity histories,E_(1)y and E_(1)l source rocks experienced two hydrocarbon generation stages,which took place in the Late Paleocene and in the Middle to Late Eocene,respectively,and had high hydrocarbon generation capacity with cumulative hydrocarbon volume of 363 and 328 mg/g,respectively.E_(1)m source rock only had one hydrocarbon generation process in the Late Eocene,which had low hydrocarbon generation capacity with cumulative hydrocarbon volume of only 24 mg/*** future oil-gas exploration in the Jiaojiang sag should focus on hydrocarbon generation center and select targets in the central uplift formed before the Miocene with high-quality traps.

关键词： East China Sea Basin Jiaojiang sag source rock geochemical characteristics hydrocarbon generation basin modeling petroleum geology

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Influence of Magmatic Intrusion on Abnormal hydrocarbon generation and Expulsion of Source Rock:A Case Study of the Dongying Sag, Bohai Bay Basin

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1322-1337页

作者： LI Chuanming ZENG Jianhui WANG Maoyun LONG Hui LIU Shuning State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum (Beijing) College of Geosciences China University of Petroleum (Beijing)

How gabbro affects the generation and expulsion of hydrocarbons in muddy surrounding rocks is clarified by analyzing thin section, major and trace elements, total organic carbon（TOC）, pyrolysis, extracts and vitrinite reflectance data from source rocks in the Chunxi area the Dongying Sag, Bohai Bay Basin, eastern China. The results show that a magma intrusion brings copious heat to the source rocks, which promotes abnormal maturation of organic matter（OM） and rapid hydrocarbon generation. The CH4and H2produced by gabbro alteration play a role in hydrocarbon generation of source rocks. The hydrothermal process during magma intrusion provides many different minerals to the source rock, resulting in carbonate-rich surrounding mudstone. The carbonate and clay minerals produced by volcanic mineral alteration jointly catalyze the hydrocarbon generation of the source rock. The high-temperature baking of the intrusion results in hydrothermal pressurization and hydrocarbon generation pressurization, causing many fractures in the surrounding rock. The generated oil and gas are discharged through the fractures under diffusion and pressure. Mantle-derived CO2is also conducive to the expulsion of hydrocarbons because of its strong enrichment capacity for hydrocarbons.

关键词： catalysis Dongying Sag Eocene high temperature hydrocarbon generation igneous rock source rock

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hydrocarbon generation Evaluation of Permo-Carboniferous Source Rocks in Qinggu-2 Well in Dongpu Depression,China

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Journal of Earth Science 2010年第1期21卷 94-103页

作者：朱炎铭陈尚斌兰晓东王猛方俊华 Key Laboratory of Coal Bed Methane Resource and Reservoir Formation Course of Ministry of Education China University of Mining and Technology(Xuzhou) College of Resource and Geoscience China University of Mining and Technology(Xuzhou) College of Resource and Geoscience China University of Mining and Technology(Xuzhou )

The Dongpu （东濮） depression is a Mesozoic subsidence and Cenozoic fault basin developed within the North China eraton. Since the deposition of Permo--Carboniferous hydrocarbon source rock, the depression has undergone many tectonic disturbances and uplifts. The source rocks have un- dergone nonuniform uplift, deformation, deep burying, and magmatism, and those led to an inter- rupted or stepwise evolution of the hydrocarbon source rocks in Qinggu （庆古）-2 well. We have investigated the history of burying, heating, and hydrocarbon generation of the Permo-Carboniferous hy- drocarbon source rocks not just on the basis of tectonic disturbance and deep burying, but also with new studies in apatite fission track analysis, fluid inclusion measurements, and the application of the numerical simulation of EASY%Ro. The heating temperature of the source rocks pulsated upward from Indosinian to Himalayan stages and reached a maximum during early Himalayan. This led to the stepwise increases of organic maturation and multiple stages of hydrocarbon generation. This study delineated the tectonic stages, maturity evolved ranges, and the intensity of hydrocarbon generation of Permo-Carboniferous source rocks in Qinggu-2 well. The hydrocarbon gen- eration mainly occurred during Indosinian and early Himalayan. The early Himalayan stage hydrocarbon generation is the larger one, but the Dongying （东营） movement, which happened at the end of early Himalayan, may destroy the trapped oil and gas. Thereby, future exploration will need to pay more attention to the Dongying movement effect in Qinggu-2 well area, and it may get new breakthrough in Permo-Carboniferous oil and gas.

关键词： Permo-Carboniferuus source rock tectonic-burial history hydrocarbon generation numerical simulation of EASY%Ro.

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hydrocarbon generation from Carboniferous-Permian coaly source rocks in the Huanghua depression under different geological processes

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Petroleum Science 2020年第6期17卷 1540-1555页

作者： Jin-Jun Xu Qiang Jin Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580ShandongChina Pilot National Laboratory for Marine Science and Technology China University of Petroleum(East China)Aoshanwei Wenhai Road 1Qingdao 266237ShandongChina

Natural gas and condensate derived from Carboniferous-Permian(C-P)coaly source rocks discovered in the Dagang Oilfield in the Bohai Bay Basin(east China)have important implications for the potential exploration of C-P coaly source *** study analyzed the secondary,tertiary,and dynamic characteristics of hydrocarbon generation in order to predict the hydrocarbon potentials of different exploration areas in the Dagang *** results indicated that C-P oil and gas were generated from coaly source rocks by secondary or tertiary hydrocarbon generation and characterized by notably different hydrocarbon products and generation *** hydrocarbon generation was completed when the maturity reached vitrinite reflectance(Ro)of 0.7%-0.9%before uplift prior to the *** hydrocarbon generation from the source rocks was limited in deep buried sags in the Oligocene,where the products consisted of light oil and *** activation energies for secondary and tertiary hydrocarbon generation were 260-280 kJ/mol and 300-330 kJ/mol,respectively,indicating that each instance of hydrocarbon generation required higher temperature or deeper burial than the previous *** with secondary or tertiary hydrocarbon generation from C-P coaly source rocks were interpreted as potential oil and gas exploration regions.

关键词： hydrocarbon generation Thermal simulation Coaly source rocks Carboniferous-Permian Huanghua depression

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hydrocarbon generation from lacustrine shales with retained oil during thermal maturation

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Petroleum Science 2020年第6期17卷 1478-1490页

作者： Xin-He Shao Xiong-Qi Pang Mao-Wen Li Zhi-Ming Li Yi Zhao State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China College of Geosciences China University of PetroleumBeijing 102249China State Key Laboratory of Shale Oil and Shale Gas Resources and Eff ective Development SINOPEC Petroleum Exploration and Production Research InstituteBeijing 100083China SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms Wuxi Institute of Petroleum GeologyWuxi 214126JiangsuChina

Thermal maturation in the shale oil/gas system is inherently complex due to the competitive interplays between hydrocarbon generation and retention *** study hydrocarbon generation characteristics from shales within different stages of thermal maturation under the influence of retained oil,we performed Micro-Scale Sealed Vessels(MSSV)pyrolysis on a set of artificially matured lacustrine shale s amples from the Shahejie Formation in the Dongpu Depression in Bohai B ay Basin,*** results show that hydrocarbon yields of shale samples with or without retained oil at various thermal maturities follow different evolution *** components(C15+)in samples crack at high temperatures and generally follow a sequence,where they first transform into C6-14 then to C2-5 and *** accounts for most of the gaseous products at high temperatures in all samples,with different *** cracking of C2-5 is the main methane-generating process in samples with retained oil,whereas the source of methane in samples without retained oil is *** the studied shales,retained oils at early-mature stage retard the transformation of liquid to gaseous hydrocarbon and prompt the cracking of C2-5 to C1 to some *** reaction related to gypsum in the studied samples is the primary reason that can explain the loss of hydrocarbon yields,especially at high *** addition,transformation of volatile hydrocarbons to gas and coke also accounts for the loss of generated hydrocarbon,as a secondary factor.

关键词： MSSV pyrolysis hydrocarbon generation Lacustrine shales Thermal maturation Retained oil

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hydrocarbon generation Evolution of Permo-Carboniferous Rocks of the Bohai Bay Basin in China

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Acta Geologica Sinica(English Edition) 2010年第2期84卷 370-381页

作者： ZHU Yanming QIN Yong SANG Shuxun CHEN Shangbin LAN Xiaodong Coalbed Methane Resources and Reservoir Formation Process Key Laboratory of Ministry of Education China University of Mining and Technology Xuzhou Jiangsu 221008 China College of Resource and Geoscience China University of Mining and Technology Xuzhou Jiangsu 221116 China

The Bohai Bay Basin is a Mesozoic subsidence and Cenozoic rift basin in the North China Craton. Since the deposition of the Permo-Carboniferous hydrocarbon source rock, the basin has undergone many tectonic events. The source rocks have undergone non-uniform uplift, twisting, deep burying, and magmatism and that led to an interrupted or stepwise during the evolution of hydrocarbon source rocks. We have investigated the Permo-Carboniferous hydrocarbon source rocks history of burying, heating, and hydrocarbon generation, not only on the basis of tectonic disturbance and deeply buried but also with new studies on apatite fission track analysis, fluid inclusion measurements, and the application of the numerical simulation of EASY % Ro. The heating temperature of the source rocks continued to rise from the Indosinian to Himalayan stage and reached a maximum at the Late Himalayan. This led to the stepwise increases during organic maturation and multiple stages of hydrocarbon generation. The study delineated the tectonic stages, the intensity of hydrocarbon generation and spatial and temporal distribution of hydrocarbon generations. The hydrocarbon generation occurred during the Indosinian, Yanshanian, and particularly Late Himalayan. The hydrocarbon generation during the late Himalayan stage is the most important one for the Permo-Carboniferous source rocks of the Bohai Bay Basin in China.

关键词： Permo-Carboniferous source rocks burial history thermal history hydrocarbon generation EASY % Ro numerical simulation Bohai Bay basin

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Influence of hydrogen fugacity on thermal transformation of sedimentary organic matter:Implications for hydrocarbon generation in the ultra-depth

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Science China Earth Sciences 2022年第11期65卷 2188-2201页

作者： Jia WU Fujia JI Yuan WANG Bernhard M.KROOSS Kun HE Xiao JIN Qingyong LUO Yanan YANG Ningning ZHONG State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geoscience China University of Petroleum(Beijing)Beijing 102249China K&A Petrophysics Consulting Juelich 52428Germany PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China Development and Research Center National Geological Archives of ChinaChina Geological SurveyBeijing 100037China

hydrocarbon generation from sedimentary organic matter(SOM)with an original net C oxidation state(OS,-1–-2)is a disproportionation reaction involving the transfer of internal(“organic”)hydrogen and producing oxidized C(up to OS=+4)and reduced C(down to OS=-4).The contribution of extrinsic(“inorganic”)hydrogen could lead to an increase of hydrocarbon yields,but mechanisms and potential sources are still unclear,although it is supported by some experimental *** this study,we have analyzed quantitatively the effect of increasing hydrogen fugacity on the hydrocarbon generation behavior of the Cambro-Ordovician Alum shale at 350℃and 40 *** fugacity in the experimental system was controlled by the magnetite-hematite(MH)*** experimental data confirm that a more reducing environment will increase overall hydrocarbon yields and depress CO_(2) *** elevated hydrogen fugacity was found to correlate with an increase in δ^(13)C isotopic composition of methane and a decrease of δ^(13)C values in CO_(2),ethane and *** demonstrates that elevated hydrogen fugacity constrained by water-rock reaction in sedimentary basins can enhance hydrocarbon generation by“hydrocracking”.This mechanism of hydrocarbon generation by organic-inorganic interactions might be ubiquitous in the deeper sections of sedimentary basins(approximately 4–10 km).Thus,it will extend the connotation of the current theory on petroleum *** level of hydrogen fugacity,constrained by water-rock reactions,increases with depth and may thus activate over-maturity sedimentary organic matter to produce more *** end of hydrocarbon generation will thus move to a greater depth than predicted by the traditional *** will be correlated to the capacity of the buffer system,which should,in consequence,be taken into account in petroleum exploration,similar to the hydrogen index(HI)of *** extension of the fundamental theory will help to enlarge the area of petro

关键词： Hydrous pyrolysis Thermal decomposition Magnetite-hematite redox buffer hydrocarbon generation Organic-inorganic interaction

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Study on the relationship between hydrocarbon generation and pore evolution in continental shale from the Ordos Basin,China

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Petroleum Science 2021年第5期18卷 1305-1322页

作者： Ji-Yuan Wang Shao-Bin Guo School of Energy Resources China University of GeosciencesBeijing100083China Key Laboratory of Strategy Evaluation for Shale Gas Ministry of Land and ResourcesBeijing100083China

The relationship between hydrocarbon generation and the evolution of shale pore structure and its heterogeneity of continental shale from the Ordos Basin,China was quantitatively studied based on thermal simulation experiment,mercury injection capillary pressure(MICP),gas adsorption,vitrinite reflectance(R_(o))analysis,and hydrocarbon generation test combined with Frenkel-Halsey-Hill(FHH)fractal *** result shows that the pore volume(PV)and specific surface area(SSA)of pores with different pore sizes show a trend of decreasing first and then increasing as the maturity increases in general,R_(o)>1.59%is initially defined as a favorable stage for pore development in continental *** generation has different effects on pore heterogeneity of different *** the N_(2)adsorption,the roughness of small pore surface(D_(1))decreases in the oil window;the complexity of large pore structure(D_(2))increases in the oil window but decreases in the gas *** the MICP,the heterogeneity of small pore(D_(1))increases in the oil window and increases first and then decreases in the gas window;D_(2)remains basically constant during the whole stage and is close to 3,indicating that the heterogeneity of large pores is extremely strong and is not affected by hydrocarbon generation.

关键词： Shale hydrocarbon generation Pore evolution Fractal dimension

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Process and Mechanisms of Deep Fluid Effects on hydrocarbon generation and Pore Space in Shale:A Case Study from the Mesoproterozoic Xiamaling Formation in the Zhaojiashan Section

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Acta Geologica Sinica(English Edition) 2022年第4期96卷 1342-1352页

作者： MENG Qingqiang PANG Qian HU Guang JIN Zhijun ZHU Dongya LIU Jiayi ZHANG Chuanwen State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development SINOPECBeijing 100083China Petroleum Exploration and Product Research Institute SinopecBeijing 102206China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 637001China Institute of Energy Peking UniversityBeijing 100871China School of Energy Chinese University of Geosciences(Beijing)Beijing 100083China

Heat carried by deep fluid might greatly affect hydrocarbon generation and pore space in *** intrusion carrying high levels of heat may be a means by which to explore the influence of deep fluid on shale *** study evaluates hydrocarbon generation and analyzed the evolution of shale storage space in the third member of the Xiamaling Formation in the Zhaojiashan section,Hebei Province,based on experimental data such as TOC,SEM,VRo,low-temperature N_(2)adsorption and high-pressure mercury *** results show that the dyke intrusion reduced the shale TOC content drastically―by up to 77%―and also induced instantaneous hydrocarbon generation over a range about 1.4 times the thickness of the ***,the dyke intrusion might transform organic pores in surrounding shales into inorganic *** were two shale porosity peaks:one appeared when VRo=2.0%,caused by the increase of organic pores as thermal maturity increased,the other occurred when the VRo value was between 3%and 4%,caused by the increase of inorganic mineral *** can be concluded that dyke intrusion can be an effective tool with which to study how deep fluid affects instantaneous hydrocarbon generation and pore space in shale.

关键词： deep fluid hydrocarbon generation thermal effect pore Xiamaling Formation

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