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Discovery and identification of clay-sized tuffaceous rocks in Chang 7 Member of Upper Triassic Yanchang Formation in Ordos Basin,China

引用

Journal of Central South University 2020年第6期27卷 1814-1827页

作者： ZHENG Qing-hua LIU Xing-jun LIU Yi-qun ZHOU Ding-wu YOU Ji-yuan YANG Kai-yan School of Chemistry&Chemical Engineering Yulin UniversityYulin 719000China Changqing Division China Petroleum Well Logging Limited CompanyXi’an 710201China Department of Geology Northwest UniversityXi’an 710069China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266510China Fengcheng Field Operation District PetroChina Xinjiang Oilfield CompanyKaramay 834000China

This study for the first time demonstrates that some of the so-called clay-sized mudstones observed by the naked eye,such as clay-sized black mudstones and clay-sized oil shales,which are rich in black organic matter(including oil and asphaltene),in the Chang 73 Submember of the Upper Triassic Yanchang Formation in the Ordos Basin of China are actually clay-sized tuffaceous rocks(including tuff,sedimentary tuff and tuffaceous sedimentary rock)with high hydrocarbon generation ***,these rocks can be defined as clay-sized tuffaceous source *** of this lithology has important theoretical and practical significance for the exploration and development of shale oil in the Chang 7 *** the macroscopic observation of drill cores and outcrop profiles,microscopic observation of electron probe thin sections and whole-rock inorganic geochemical analysis(including major,trace and rare earth elements),this work demonstrates that the organic matter-rich clay-sized tuffaceous rocks,especially clay-sized tuffs,have the following ***,the clay-sized tuffaceous rocks with little black organic matter are mainly greyish white,yellowish brown and purplish grey,and mixed colors occur in areas with strong bentonite ***,the clay-sized tuffaceous rocks have experienced strong devitrification and recrystallization,forming abundant flaky aluminosilicate minerals with directional *** thin sections under a polarizing microscope,the interference colors generally show regular alternation between the lowest interference color of first-order yellow and the highest interference color of second-order ***,the rock samples plot in the igneous rock field in the TiO2-SiO2 cross-plot and exhibit similar trace element and rare earth element patterns on spider diagrams,indicating that the samples are derived from the same *** results prove that clay-sized tuffaceous rocks may be widespread in the Chang 73 S

关键词： Ordos Basin Chang 7 Member clay-sized mudstone clay-sized tuffaceous rock lithologic identification

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