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Discussion of gas enrichment mechanism and natural gas origin in marine sedimentary basin,china

Science Bulletin 2007年第S1期 62-76页

作者： zhu guangyou, zhao wenzhi, zhang shuichang, liang yingbo & wang zhengjun research center of petroleum geology, research institute of petroleum exploration and development, petrochina, beijing 100083, china

There are abundant natural gas resources in Chinese marine sedimentary basin. The exploration hot shots of natural gas are the Palaeozoic marine strata here in recent years, and several large scale gas fields have been discovered. Chinese Palaeozoic high-post matured and coal measure hydrocarbon source rocks are mainly prone to gas generation in the present. This research considered that gas source rocks and TSR are the key cause of gas enrichment of marine strata. High-quality argillaceous and coal measure hydrocarbon rocks are distributed widely in the Palaeozoic marine strata, which have been in highly matured phase in the present. The argillaceous source rock generally contains various sulfates that could accelerate crude oil cracking to gas for TSR occurrence, and coal measure source rock mainly generates gas, so Chinese marine basin gives priority to accumulating gas. Marine strata have not founded oil reservoirs in the Sichuan Basin and Ordos Basin, and they consist mainly of dry gas. Marine natural gases are the mixed gases of oil cracking gas and coal-formed gas in a general way, oil cracking gases contain usually some H2S and CO2. Hydrocarbon carbon isotopes are very complicated, and methane and ethane isotopic values bear apparent reversal caused by thermal evolution and mixing among different genetic types of natural gas. Coal-formed gases are the main component of Chinese marine natural gas. The Upper Permian of the Sichuan Basin and the Carboniferous-Permian of the Ordos Basin coal measure hydrocarbon source rock present large hydrocarbon generation potential, which are the prospecting highlight of marine natural gas hereafter. Oil cracking gas exploration will be paid much attention to in the Tarim Basin because of the lack of coal measure hydrocarbon source rock.

关键词： marine facies Palaeozoic carbonate rock genetic type gas source carbon isotope hydrogen sulfide (H2S)

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Discussion of gas enrichment mechanism and natural gas origin in marine sedimentary basin,china

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Chinese Science Bulletin 2007年第A01期52卷 62-76页

作者： zhu guangyou zhao wenzhi zhang shuichang liang yingbo wang zhengjun research center of petroleum geology Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

关键词：碳酸盐岩石古生代海洋遗传学

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Unconventional petroleum Sedimentology:A Key to Understanding Unconventional Hydrocarbon Accumulation

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Engineering 2022年第11期18卷 62-78页

作者： Caineng Zou Zhen Qiu Jiaqiang zhang Zhiyang Li Hengye Wei Bei Liu Jianhua zhao Tian Yang Shifa zhu Huifei Tao Fengyuan zhang Yuman wang Qin zhang Wen Liu Hanlin Liu Ziqing Feng Dan Liu Jinliang Gao Rong Liu Yifan Li research institute of petroleum exploration and development China National Petroleum CorporationBeijing 100083China National Energy Shale Gas research and development(Experiment)center Beijing 100083China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Department of geology Colorado College Colorado SpringsColoradoCO 80903USA School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Key Laboratory of Tectonics and petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China College of Geosciences China University of PetroleumQingdao 266580China State Key Laboratory of Oil and Gas Reservoir geology and Exploitation Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China china University of petroleum Beijing 102249China Oil and Gas research center Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Earth Sciences Jilin UniversityChangchun 130061China School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China

The commercial exploitation of unconventional petroleum resources(e.g.,shale oil/gas and tight oil/gas)has drastically changed the global energy structure within the past two ***-spot intervals(areas),the most prolific unconventional hydrocarbon resources,generally consist of extraordinarily high organic matter(EHOM)deposits or closely associated sandstones/carbonate *** formation of sweet-spot intervals(areas)is fundamentally controlled by their depositional and subsequent diagenetic settings,which result from the coupled sedimentation of global or regional geological events,such as tectonic activity,sea level(lake level)fluctuations,climate change,bottom water anoxia,volcanic activity,biotic mass extinction or radiation,and gravity flows during a certain geological *** shales with EHOM content and their associated high-quality reservoir rocks deposited by the coupling of major geological events provide not only a prerequisite for massive hydrocarbon generation but also abundant hydrocarbon storage *** Ordovician-Silurian Wufeng-Longmaxi shale of the Sichuan Basin,Devonian Marcellus shale of the Appalachian Basin,Devonian-Carboniferous Bakken Formation of the Williston Basin,and Triassic Yanchang Formation of the Ordos Basin are four typical unconventional hydrocarbon systems selected as case studies *** each case,the formation of sweet-spot intervals for unconventional hydrocarbon resources was controlled by the coupled sedimentation of different global or regional geological events,collectively resulting in a favorable environment for the production,preservation,and accumulation of organic matter,as well as for the generation,migration,accumulation,and exploitation of *** petroleum sedimentology,which focuses on coupled sedimentation during dramatic environmental changes driven by major geological events,is key to improve the understanding of the formation and distribution of sweet-spot intervals(areas)

关键词： Sedimentology Black shales Fine-grained sediments Organic matter accumulation Extraordinarily high organic matter Unconventional petroleum

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