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Sedimentology and Chronology of Paleogene Coarse clastic rocks in East-Central Tibet and Their Relationship to Early Tectonic Uplift

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Acta Geologica Sinica(English Edition) 2007年第3期81卷 398-408页

作者： ZHOU Jiangyu WANG Jianghai K. H. BRIAN A. YIN M. S. MATTHEW Faculty of Earth and Resources China University of Geosciences Wuhan Hubei 430074 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong 510640 China Food Engineering Research Center of the Ministry of Education/State Key Laboratory of Biocontrol College of Life Sciences Sun Yat-Sen University Guangzhou Guangdong 510275 China Department of Earth and Space Sciences University of California Los Angeles CA 90095 USA

A systematic sedimentological and chronological study of typical Paleogene basins in eastcentral Tibet suggests that the depositional characteristics of extensively developed huge-bedded, purplish-red coarse clastic rocks formed in a tectonic setting of regional thrusting and strike-slipping represent a typical dry and hot subaerial alluvial fan environment formed in a proximal and rapidaccumulating sediment body in debris flows and a fan-surface braided river. Combining results from basin-fill sequences, sequences of coarse clastic rocks, fauna and sporo-pollen associations and thermochronological data, it is conduded that the coarse clastic rocks formed in the period of 54.2- 24.1 Ma, nearly coeval with the formation of Paleogene basins in the northern （Nangqen-Yushu thrust belt）, middle （Batang-Lijiang fault belt）, and disintegration of large basins in the southern （LanpingSimao fold belt） segments of Tibet. The widespread massive-bedded coarse clastic rocks, fold thrusting and strike-slip, thrust shortening, and igneous activities in the Paleogene basins of eastcentral Tibet indicate that an early diachronous tectonic uplift might have occurred in the Tibetan Plateau from Middle Eocene to Oligocene, related to the initial stage of collision of the Indian and Asian plates.

关键词： Paleogene clastic rocks tectonic uplift chronology east-central Tibet

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Analysis of petrophysical cutoffs of reservoir intervals with production capacity and with accumulation capacity in clastic reservoirs

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Petroleum Science 2014年第2期11卷 211-219页

作者： Wang Yanzhong Cao Yingchang Song Guoqi Song Ling Yang Tian Zhang Shaomin School of Geosciences China University of Petroleum Geological Science Research Institute Shengli Oilfield SINOPEC Western New Prospect Research Center of Shengli Oilfield SINOPEC

Methodologies have been developed for calculating cutoffs of reservoir intervals with production capacity （RIPC） and reservoir intervals with accumulation capacity （RIAC） according to the types of pore throat structures and dynamic force by using data from petrophysical analysis, production tests and mercury injection. The data are from clastic reservoirs in the third member （Es3） and the fourth member （Es4） of the Shahejie Formation in the Shengtuo area on the North Slope of the Dongying Sag, Jiyang Depression, China. The method of calculating cutoffs of RIPC is summarized as follows： 1） determination of permeability cutoffs of RIPC; 2） classification of types of pore-throat structures according to mercury injection data and then relating porosity to permeability and determining the relationship between porosity and permeability according to each type of pore-throat structure; and 3） calculating porosity cutoffs of RIPC using established correlation between porosity and permeability according to the type of pore throat structure. The method of calculating cutoffs of RIAC includes： 1） establishing a functional relationship between oil-water interracial tension and formation temperature; 2） calculating limiting values of maximum connected pore-throat radii according to formation temperature and dynamic forces of each reservoir interval; 3） correlating permeability with maximum connected pore-throat radius and then obtaining permeability cutoffs of RIAC; and 4） calculating porosity cutoffs on the basis of permeability cutoffs according to specific correlations, suitable for the type of porethroat structure. The results of this study show that porosity and permeability cutoffs of clastic reservoirs decrease with depth. For a fixed permeability cutoff, the porosity cutoff of R1PC varies because the type of pore throat is different. At a fixed temperature, porosity and permeability cutoffs of RIAC decrease as dynamic force increases. For a fixed permeability cutoff of ef

关键词： Effective reservoir petrophysical cutoff of reservoir intervals with production capacity(RIPC) petrophysical cutoff of reservoir intervals with accumulation capacity (RIAC) clastic rocks

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Palaeoclimate of the Paleogene Dongying Formation in Bozhong Sag of Bohai Bay Basin

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Petroleum Research 2021年第4期6卷 368-378页

作者： Juan Zhang Chenchen Wang Jingmin Wang Linbo wang Yunqian Jia Rongrong Hu College of Earth Sciences Yangtze UniversityWuhan430100HubeiChina Laboratory of Reservoir Microstructure Evolution and Digital Characterization Wuhan430100HubeiChina Cooperative Innovation Center of Unconventional Oil and Gas Yangtze UniversityWuhan430100China School of Petroleum Engineering Yangtze UniversityWuhan430100China

It was showed that the sedimentary environment of lacustrine basins is more susceptible to basin size than that of marine basins,leading to frequent changes in sedimentary environment and large differences in sediment supply and *** on the comprehensive analysis of clay minerals,spore pollen,major elements and trace elements,the sedimentary environment of Dongying Formation and its evolution in Bozhong Sag were *** results showed that during the sedimentary period of Dongying Formation,the study area was in a subtropical warm and humid climate as a *** addition,the vertical distribution of spore pollen and algae was divided into four zones and each one represents different sedimentary *** zone I is characterized by a large number of spore pollen and algae,including juglanspollenites verus,ulmipollemites minor,abietineaepollenites and pinuspollenites,taxodiaceaepollenites hiatus,leiosphaeridia and granodiscus,and it indicates a relatively hot and dry climatic;Combination zone II mainly contains juglanspollenites verus,ulmipollemites minor,abietineaepollenites and pinuspollenites,pediastrum and *** with I,the number of spore pollen and algae decreases,but the number of pediastrum increases a lot,which represents warm and humid *** combination zone III is dominated by abietineaepollenites and pinuspollenites and chaetosphaeridium,and the species and quantity decrease *** indicates a relatively hot and humid climate at that *** zone IV contains a small amount of spore pollen and algae,and it means the climate was warm and humid at that *** frequent changes of sedimentary environment in lacustrine basins are influenceded by regional tectonic environment and basin *** S/A and E-T parameters,the paleoclimate in the study area was delineated and 10 sedimentary environment interfaces were identified,which further illustrated the characteristics of frequent fluctuati

关键词： clastic rocks Spore pollen assemblage zone Sedimentary environment Bozhong sag Lacustrine basin

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Reservoir Characteristics and Control Factors of The 4th Member of Xujiahe Formation in The Middle Part of Western Sichuan Depression

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Acta Geologica Sinica(English Edition) 2015年第A01期89卷 77-78页

作者： SONG Hongyu JI Youliang ZHOU Yong CHEN Xianliang ZHAO Chunni DONG Ruojing YANG Yong College of Geosciences China University of Petroleum Beijing 102249 China Xi'an University of Science and Technology Xi'an Shanxi 710054 China Exploration and Development Research Institute PetroChina Southwestern Oil and Gasfield Company ChengduSichuan 610041 China Research Institute of Petroleum Exploration andDevelopment Beijing 100083 China PetroChina Exploration and Development Company Beijing 100034 China

1 Introduction The western Sichuan depression is a foreland basin which formed since late Triassic. The middle part of it is the focus of our study, the west boundary is Longmen mountain and the east is Zhongjiang, th... 详细信息

关键词： SHALE gas reservoirs OIL shales SANDSTONE clastic rocks SCANNING electron microscopes

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