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Very Low-Grade Metamorphism of Clastic Rocks from the meso-neoproterozoic and the Paleozoic along the Profile Yueyang-Linxiang in Northeastern Hunan Province and Its Geological Implications

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1743-1753页

作者： WANG Hejing YUAN Lei WANG Ling ZHOU Zhao AN Jiali School of Earth and Space Sciences Peking University Key Laboratory of Orogenic Belt and Crustal Evolution Ministry of Education

This study uses illite crystallinity,chlorite crystallinity,illite polytypes,the b0 cell-dimension of K-white mica,clay mineral assemblages and mineral geothermo-geobarometers to investigate the overprint of diagenesis and metamorphism on the meso-neoproterozoic and the Lower Paleozoic along the profile Yueyang-Linxiang in northeastern Hunan Province,*** crystallinity Kbler index（KI） of the 〈2μm fractions ranges from 0.225 to 0.485°Δ2θ while chlorite crystallinity Arkai index（AI） ranges from 0.244 to 1.500°Δ2θ.This indicates that the meso-neoproterozoic and the Lower Paleozoic along the profile Yueyang-Linxiang were overprinted with diagenesis and anchi- to *** metamorphic temperature is estimated with the IV site chlorite geothermometer roughly at 360℃.The b0 cell dimension values of illites（K-mica） range from 0.9002 to 0.9054 nm and,on average,at 0.9030 nm for the *** on cumulative frequency curves of illite（K-mica） b0 cell dimension,the peak metamorphic pressure of the mesoneoproterozoic along the profile Yueyang-Linxiang is derived of an intermediate pressure *** illites occur in the 2M1 polytype and some of them in a mixture of 2M1＋1M types especially those in the *** result partly agrees with the conclusion of the lower greenschist and greenschist facies of the Lengjiaxi and Banxi ***,it is not agreed with the sedimentary cover from the Sinian to the Lower Paleozoic or from the Banxi Group to the Lower *** thickening due to ＂collision＂ between the Yangtze and Cathaysia blocks led to an increase in the thickness of the meso-neoproterozoic to ca.14 km and resulted in a temperature increase in those rocks due to *** very low grade to low grade metamorphism overprinting the meso-neoproterozoic implies that the so called ＂Chiangnania or Jiangnan orogen＂ was no relative with the ＂Grenvillian orogeney;instead,it might be a continuous amalgamation product between the Yang

关键词： diagenesis very low-grade metamorphism illite crystallinity meso-neoproterozoic lowerpalaeozoic

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The primary dolostone in the meso-neoproterozoic:Cases study on platforms in China

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Journal of Palaeogeography 2022年第2期11卷 151-172页

作者： Zhi-Dong Bao Han-Cheng Ji Yuan Wang Zong-Feng Li Ting Liang Bo Niu Ming-Yang Wei Kai Lu Yan-Qing Shi Hua Zhang Pu Wan Zhuo-Lun Li Zhi-Bo Yang Rui Liu Can-Xing Liu Xu-Lin Zhong Xiao-Qi Guo Peng-Fei Xiang Zhong-Xian Cai Shui-Chang Zhang China University of Petroleum(Beijing) Beijing 102249China State Key Laboratory of Petroleum Resources and Prospecting Ministry of EducationBeijing 102249China China University of Geosciences(Wuhan) Wuhan 430074China Petro China Research Institute of Petroleum Exploration and Development Beijing 100083China

meso-neoproterozoic dolostone is abnormally well-developed in the platform areas in China,detailly,in the mesoproterozoic Calymmian Wumishan Formation of North China Basin,neoproterozoic Ediacaran Qigbulak Formation of Tarim Basin,and the neoproterozoic Ediacaran Dengying Formation of Sichuan *** outcrops and drilling cores from these basins show that these dolostones are mostly thick-bedded to massive,with mud-sized to silt-sized crystalline dolostone reaching 86%-97%of the total dolostone *** dolostones basically suffered no secondary metasomatism,regardless of containing microorganisms(such as algae and bacteria)or *** analyses of sedimentary palaeogeographic features indicate that:(1)the meso-neoproterozoic dolostone nearly covered the entire area basins,and was widely deposited in supratidal to intertidal zones,as well as in open platform environments;(2)the dolostone was subdivided according to the crystalline size,with the distribution controlled by geomorphology,i.e.,the pure mud-sized crystalline dolostone developing in depression areas,whereas the grainy mud-sized crystalline dolostone or the mound stromatolitic mud-sized crystalline dolostone developing in uplift areas;(3)deep-water basins developed between the carbonate platforms,and the seismic profiles show that these basins were formed by syngenetic deep faults in the meso-neoproterozoic *** syngenetic faults increased Mg^(2+)concentration in the seawater by injecting rich-Mg2+-bearing hydrothermal fluids into the carbonate *** analyses of geochemical and paleoclimatic indexes reveal that there is no obvious difference in carbon and oxygen isotope ratios between dolostones having different textures,with the ratios similar to those of the global seawater of the meso-neoproterozoic,indicating that the silt-sized crystalline dolostone has the same sedimentary origin as the mud-sized crystalline dolostone,i.e.,the former is from authigenic recrystallization of the

关键词： Thick-bedded to massive dolostone C-O isotopes meso-neoproterozoic Tarim basin Sichuan basin North China Basin

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Dynamic evaluation on sealing capacity of caprocks of the meso-neoproterozoic reservoirs in Ordos Basin,China

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Energy Geoscience 2024年第1期5卷 99-107页

作者： Yusong Yuan Yunqin Hao Rongqiang Zhang Key Laboratory of Geology and Resources in Deep Stratum Petroleum Exploration and Production Research InstituteSINOPECBeijing 102206China

The meso-neoproterozoic is a new play in the Ordos Basin.A deeper understanding about the dynamic relationship between the caprocks and the source rocks is *** on the comprehensive analysis of hydrocarbon source development characteristics of the meso-neoproterozoic and its overlying strata,as well as the formation contact relationships,lithology characteristics and exploratory drilling data,it is recognized that the meso-neoproterozoic contains two types of petroleum accumulation assemblage,that is,the“self-sourced indigenous”and“upper source rock-lower reservoir”*** former is mainly controlled by the development and distribution of source rocks of the Changcheng System,with the Lower Cambrian shale sequence as its *** later is controlled by the superposition between the meso-neoproterozoic and its overlying source rocks and this assemblage is mainly distributed in Hangjinqi and Pingliang areas with the Carboniferous-Permian shale sequence as its *** dynamic evaluation on the displacement pressure serves to reconstruct the displacement pressure history of the *** results show that the shale sequence of the Cambrian Maozhuang Formation in well XY 1 in the southern Ordos Basin has possibly acquired the ability of sealing natural gas since the early of Late *** displacement pressure increased rapidly up to 20 MPa during the Late Triassic-Jurassic and keeps at 9.2 MPa at present,indicating fair sealing *** Carboniferous-Permian caprocks in Hangjinqi area could have acquired the ability to seal natural gas in the Late Jurassic-Early Cretaceous,and the present-day displacement pressure is 9e12 MPa,indicating good sealing *** upper Paleozoic caprock in Pingliang area has been able to seal natural gas since the Early Jurassic,with a maximum displacement pressure of 23 MPa during the Cretaceous period and a current value of 17 e20 MPa,indicative of strong ability to seal natural *** sealing ability of

关键词： Ordos Basin meso-neoproterozoic Caprock sealing ability Displacement pressure

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