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Joint exploration of crustal structure in Fuzhou basin and its vicinities by deep seismic reflection and high-resolution refraction as well as wide-angle reflection/refraction

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Science china Earth Sciences 2005年第7期48卷 925-938页

作者： ZHU Jinfang1, XU Xiwei2, ZHANG Xiankang3. HUANG Zonglin1, CHEN Xiangxiong1, FANG Shengming3. LIU Baojin3. ZHENG Rongzhang2,4.1. Seismological Bureau of Fujian Province,Fuzhou 3.0003.china 2. Institute of Geology,china earthquake Administration,Beijing 100029,china 3. research center for exploration geophysics,china earthquake Administration,zhengzhou 4.0002,china 4. State Key Laboratory of earthquake Dynamics,Institute of Geology,china earthquake Administration,Beijing 100029,china Seismological Bureau of Fujian Province Fuzhou 350003 China Institute of Geology China Earthquake Administration Beijing 100029 China research center for exploration {3. China Earthquake Administration Zhengzhou 450002 China State Key Laboratory of earthquake Dynamics Institute of Geology China Earthquake Administration Beijing 100029 China

The Fuzhou basin and its vicinities are located at the northern end of the southeastern coastal seismic zone of the mainland of china. By the joint explorations of high-resolution seismic refraction and wide-angle reflection/refraction as well as deep seismic reflection in the region, which is the first synthetic profile in china, its fine velocity structure and geometric structure from the ground to Moho discontinuity is obtained. The result shows that the crust is obviously layered with a thickness of about 3. km. Basically, it consists of two parts: upper crust and lower crust. The velocity of the upper crust is 5.9-6.2 km/s in which there is a 3.4.km-thick weak low-velocity layer between the depths of 10-15 km, while the velocity of the lower crust in the range of 6.3.7.2 km/s. There exists a strong velocity gradient layer about 3.km thick above the Moho discontinuity whose velocity increases from 6.5 to 7.27 km/s. There exist high-angle normal faults that are small in size and extend only in the shallow crust. These faults are the secondary developed on the hanging wall of westward dipping low-angle normal faults. Thus, their seismogenic ability is limited, however, there exists a high-angle deep fault in the crust from Changle-Zaoan fault zone to seashore fault zone. This deep fault has cut the interface between the upper and lower crusts and Moho discontinuity, and may be the deep structure to trigger destructive {3. source in future to affect Fuzhou City. These results have advanced the detecting precision of the deep structure in the southeastern coastal seismic zone of the mainland of china. In the aspect of the combined feature of the deep and shallow extensional structures that consist of the westward dipping low-angle normal faults and secondary normal faults on their hanging walls in the upper crust, it is firstly obtained that a united structural interpretation has deepened the knowledge about the deep dynamic process in the southeastern coasta

关键词： deep seismic reflection high-resolution seismic refraction wide-angle.

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Combined adjustment project of national astronomical geodetic networks and 2000' national GPS control network

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Progress in Natural Science:Materials International 2005年第5期15卷 435-441页

作者： YANG Yuanxi1*, ZHA Ming2, SONG Lijie3. WEI Ziqing1, WANG Zhouping2, OUYANG Guichong2, XU Bilin2, WU Xiaoping3.and WANG Junqin4.1. Xi'an research Institute of Surveying and Mapping, Xi'an 710054. china 2. Xi'an Informational and Technical {4. of Surveying and Mapping, Xi'an 710054. china 3. zhengzhou Institute of Surveying and Mapping, zhengzhou 4.0052, china 4. The First Surveying Team of Tianjin, Tianjin 3.014., china) Xian research Institute of Surveying and Mapping Xi''an 710054 China Xi''an Informational and Technical center of Surveying and Mapping Xi''an 710054 China zhengzhou Institute of Surveying and Mapping Zhengzhou 450052 China

The combined adjustment project of the nationwide astronomical geodetic networks and 2000' national GPS control network involve 4.519 terrestrial observational stations and 2666 GPS observational stations. In the terrestrial network, 25107 stations are height fixed and 23.12 stations are in three dimensions. 4.0793.terrestrial observations and 183.68 unknowns are involved in the adjustment. The three-dimensional observational models for the adjustment have been established. The crustal deformation influences and corrections are researched. Fast methods of solving partitioned adjustment for super large-scale geodetic network have been studied. The standard deviations of three-dimensional coordinates for all stations are evaluated. As a result of the combined adjustment, a unified national geodetic network with nearly 50000 stations is established, the high accurate three-dimensional geocentric coordinates are obtained. The standard deviation for geoid is averagely 0.2 m, for vertical deflection is about 1.5″, for the horizontal position is about 0.12 m, for the geodetic height is about 0.14.m, and for the three-dimensional position is averagely 0.3.m.

关键词： astronomical geodetic network GPS network combined adjustment datum geocentric coordinates.

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Study on attribute characterization for reservoir dynamic monitoring by seismic

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Science china Earth Sciences 2008年第S2期51卷 218-225页

作者： CHEN XiaoHong1,3.LI JingYe2,3.& ZHAO Wei4.1 Key Lab of Geophysical exploration of CNPC,china Petroleum University,Beijing 10224.,china 2 Basin & Reservoir {3. center,china Petroleum University,Beijing 10224.,china 3.State Key Laboratory of Petroleum Resource and Prospecting,china University of Petroleum,Beijing 10224.,china 4.{3. center of CNOOC,Beijing 100027,china 1. Key Lab of Geophysical exploration of CNPC China Petroleum University Beijing 102249 China 3. State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China 2. Basin & Reservoir research center China Petroleum University Beijing 102249 China 4. research center of CNOOC Beijing 100027 China

Study on characterizing reservoir parameters dynamic variations by time-lapse seismic attributes is the theoretical basis for effectively distinguishing reservoir parameters variations and conducting time-lapse seismic interpretation,and it is also a key step for time-lapse seismic application in real oil fields. Based on the rock physical model of unconsolidated sandstone,the different effects of oil saturation and effective pressure variations on seismic P-wave and S-wave velocities are calculated and analyzed. Using numerical simulation on decoupled wave equations,the responses of seismic amplitude with different offsets to reservoir oil saturation variations are analyzed,pre-stack time-lapse seismic attributes differences for oil saturation and effective pressure variations of P-P wave and P-S converted wave are calculated,and time-lapse seismic AVO (Amplitude Versus Offset) response rules of P-P wave and P-S converted wave to effective pressure and oil saturation variations are compared. The theoretical modeling study shows that it is feasible to distinguish different reservoir parameters dynamic variations by pre-stack time-lapse seismic information,including pre-stack time-lapse seismic attributes and AVO information,which has great potential in improving time-lapse seismic interpreta-tion precision. It also shows that the time-lapse seismic response mechanism study on objective oil fields is especially important in establishing effective time-lapse seismic data process and interpreta-tion scheme.

关键词： time-lapse seismic dynamic monitoring rock physical model pre-stack attribute Amplitude Versus Offset (AVO)

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Dam risk assistant analysis system design

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Science china(Technological Sciences) 2008年第S2期51卷 101-109页

作者： HE XianFeng1,2,3.GU ChongShi3.4.WU ZhongRu3.4.& SU HuaiZhi3.4.1 Yellow River Institute of Hydraulic {4.,zhengzhou 4.0003.china 2 Embankment Security Defect Prevention and Control Engineering {4. center of MWR,zhengzhou 4.000,china 3.College of Water Resources and Hydropower Engineering,Hohai University,Nanjing 210098,china 4.National Engineering {4. center of Water Resources Efficient Utilization and Engineering Safety,Hohai University,Nanjing 210098,china Yellow River Institute of Hydraulic research Zhengzhou 450003 China Embankment Security Defect Prevention and Control Engineering research center of MWR Zhengzhou 45000 China College of Water Resources and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering research center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China

In order to reduce the labor intensity and task difficulty of dam risk analysis and to meet the actual requirement of dam risk analysis,it is necessary to establish a dam risk assistant analysis *** program structure and the implementation ways of the dam risk assistant analysis system are analyzed,and a procedural framework with "three-tier and multi-database" structure and "level structure" is *** concept of dam risk assessment system modular development is proposed and the coupled mode of function module and data is ***,the dam risk assistant analysis system is developed using Delphi visual programming language.

关键词： dam risk risk analysis assistant analysis system

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National 2000' GPS control network of china

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Progress in Natural Science:Materials International 2007年第8期17卷 983-987页

作者： Yang Yuanxi~(1**) Tang Yingzhe~1 Chen Chuanlu~2 Wang Min~3.Zhang Peng~4.Wang Xiaorui~2 Song Lijie~5 Zhang Zusheng~6 (1.Xi'an research Institute of Surveying and Mapping,Xi'an 710054.china 2.Geodetic Data Processing center,Xi'an 710054.china 3.center of earthquake Analysis and Prediction,china Seismological Bureau,Beijing 10003.,china 4.National Geomatics center of china,Beijing 10004.,china 5.Institute of Surveying and Mapping,{14. University of Information Engineering,{14. 4.0052,china 6.First Crustal Deformation Monitoring center,china Seismological Bureau,Tianjin 3.0180,china) [a]Xi' an research Institute of Surveying and Mapping Xi' an China [b]Geodetic Data Processing center Xi'an China [c]center of earthquake Analysis and Prediction China Seismological Bureau Beijing China [d]National Geomatics center of Chinna Beijing China [e]Institute of Surveying and Mapping Zhengzhou University of Information Engineering Zhengzhou China [f]First Crustal Deformation Monitoring center China Seimological Bureau Tianjin China

An accurately unified national GPS network with more than 2500 stations,named"National 2000' GPS Control Net- work",signed the epoch 2000.0,has been established by integrating the existing six nationwide GPS networks of china set up by differ- ent departments with different *** paper presents the characteristics of the existing GPS networks,summarizes the strategies in the integrated adjustment of the GPS network,including functional model,stochastic model as well as the adjustment principle modifi- *** modifying the adjustment strategies according to the characteristics of the existing GPS networks and under the support of the IGS stations,the accuracy of the integrated national GPS network is greatly *** datum differences among the sub networks disappear,the systematic error influences are weakened,and the effects of the outliers on the estimated coordinates and their variances are *** is shown that the average standard deviation for the horizontal component is smaller than 1.0 cm,the vertical component is smaller than 2.0 cm,and the three-dimensional (3.D) position of geocenter coordinates is smaller than 3.0 *** exterior checking ac- curacy for the 3.D position is averagely better than 1.0 cm.

关键词： GPS control network adjustment systematic errors robust estimation variance component estimation coordinate system

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Two-step interface and velocity inversion—— Study o e of the Tangshan seismic region

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Acta Seismologica Sinica(English Edition) 1998年第6期11卷 34-44页

作者： XIAO LING LAI XIAN KANG ZHANG XU YAO ZHENG research center of exploration {3., {4. Seismological Bureau, zhengzhou 4.0003. {4.

This paper studies the computation method of two step inversion of interface and velocity in a region. The 3. D interface is described by a segmented incomplete polynomial; while the reconstruction of 3. D velocity is accomplished by the principle of least squares in functional space. The computation is carried out in two steps. The first step is to inverse the shape of 3. D interface; while the second step is to do 3. D velocity inversion by distributing the remaining residual errors of travel time in accordance with their weights. The data of seismic sounding in the Tangshan Luanxian seismic region are processed, from which the 3. D structural form in depth of the Tangshan seismic region and the 3. D velocity distribution in the crust below the Tangshan Luanxian seismic region are obtained. The result shows that the deep 3. D structure in the Tangshan seismic region trends NE on the whole and the structure sandwiched between the NE trending Fengtai Yejituo fault and the NE trending Tangshan fault is an uplifted zone of the Moho. In the 3. D velocity structure of middle lower crust below that region, there is an obvious belt of low velocity anomaly to exist along the NE trending Tangshan fault, the position of which tallies with that of the Tangshan seismicity belt. The larger block of low velocity anomaly near Shaheyi corresponds to a denser earthquake distribution. In that region, there is an NW trending belt of high velocity anomaly, probably a buried fault zone. The lower crust below the epicentral region of the Tangshan M S=7.8 earthquake is a place where the NE trending belt of low velocity anomaly meets the NW trending belt of high velocity anomaly. The two sets of structures had played an important role in controlling the preparation and occurrence o

关键词： two step interface and velocity inversion 3 D velocity pattern of crust below Tangshan seismic region seismicity zone

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Age of Yingfeng rapakivi granite pluton on the north flank of Qaidam and its geological significance

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Science china Earth Sciences 2004年第4期47卷 357-365页

作者： XIAO Qinghui1,2, LU Xinxiang1,3. WANG Fei4. SUN Yangui5, WEI Xiangdong3.& XING Zuoyun6 1. Division of Granite Geology, china Geological Survey, Yichang 4.3.03. china 2. Information center of Ministry of Land and Resources, Beijing 100812, china 3. Geological Survey of Henan Province and Institute of Geological research of Henan Province, zhengzhou 4.0053. china 4. Geological Institute, china Seismological Bureau, Beijing 100029, china 5. Geological Survey Institute of Qinghai Province, Xining 81003., china 6. china University of Geosciences, Wuhan 4.0}074. china Division of Granite Geology China Geological Survey Yichang 443003 China Information center of Ministry of Land and Resources Beijing 100812 China Geological Survey of Henan Province and Institute of Geological research of Henan Province Zhengzhou 450053 China Geological Institute China Seismological Bureau Beijing 100029 China Geological Survey Institute of Qinghai Province Xining 810032 China china University of Geosciences Wuhan 430074 China

The Yingfeng rapakivi granite on the north flank of Qaidam is a newly discovered Proterozoic rapakivi pluton in china, which was found after the discovery of Shachang rapakivi in Miyun County, Beijing and Kuandian rapakivi in Jilin Province. Yingfeng rapakivi pluton is ex-posed on the north side of the suture belt between Qinling-Kunlun orogenic belt and North china plate. U-Pb zircon isotopic dating and Ar-Ar isotopic dating of both hornblende and K-feldspar from the Yingfeng rapakivi granite have been conducted. The results show that the age of (1776±3.)Ma at the upper intercept in Concorde diagram represents the age of formation of the plu-ton, whereas the age of (526 281) Ma at the lower intercept and Ar-Ar mineral dating of horn-blende and K-feldspar correspond to the age of a later event affecting the pluton, suggesting that Yingfeng pluton has ever been affected by strong regional Caledonian-Hercynian tectonic movement after its formation. The discovery of middle Proterozoic Yingfeng rapakivi granite pro-vides a petrologic evidence for the timing of cratonization of both the continental crust basement in western china and the basement of the North china plate and for a rifting event taking place in the mid-Proterozoic, suggesting that an amalgamation of ancient china continents had ever happened during the L liang Movement?between the early Proterozoic and the mid-Proterozoic.

关键词： rapakivi, U-Pb dating, Ar-Ar dating, Kunlun-Qinling orogenic belt.

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Natural gas origins of large and medium-scale gas fields in china sedimentary basins

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Science china Earth Sciences 2008年第S1期51卷 1-13页

作者： ZHANG ShuiChang &ZHU GuangYou research center of research Institutes of Petro{3. {4. and Development,Beijing 100083.{3. research center of research Institutes of Petro{3. {4. and Development Beijing 100083 China

china sedimentary basins present abundant natural gas resource thanks to its unique geological *** highly-matured hydrocarbon source rocks,widespread coal-measure strata and low temperature Quaternary saline strata,etc.,indicate the wide foreground of china natural gas resources. Up to now,most of the petroliferous basins have been discovered to have wholesale natural gas accumulation from Precambrian,Paleozoic,Mesozoic to Cenozoic in the east,the central,the west and the coast of *** large and medium-scale gas reservoirs are mainly composed of hydrocarbon gas with big dry coefficient,tiny non-hydrocarbon,wide carbon isotope distribution and varying origin types,the hydrocarbon gas includes coal-formed gas,oil-formed gas,biogenic gas and inorganic gas, ***-formed gas is the main type of china natural gas resources,in particular several explored large-scale gas fields(>100 billion cubic meter)of Kela 2,Sulige and Daniudi,etc.,they all belong to coal-formed gas fields or the gas fields consisting mostly of coal-formed ***-formed gas is also abundant in china marine basins,for example marine natural gas of Sichuan Basin generated from crude oil cracking *** and secondary biogenic gas fields were discovered respectively in the Qaidam Basin and Western Slope of Songliao *** addition,inorganic gases are mainly distributed in the eastern china,in particular the Songliao Basin with abundant carbon dioxide accumulation,indicating that the eastern china present large exploration potential of inorganic gas.

关键词： natural gas origin sedimentary basin large and medium-scale gas field

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Patterns of platinum-group elements in mantle peridotite, granulite xenoliths and basalt in Hannuoba

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Chinese Science Bulletin 1999年第18期44卷 1676-1681页

作者： CHU Xuelei, LI Xiaolin, XU Jiuhua and LIU Jianming1. The research center of Mineral Resources exploration , Chinese Academy of Sciences , Beijing 100101, {3. 2. Institute of Geology , Chinese Academy of Sciences , Beijing 100029, {3. 3. Institute of High Energy Physics , Chinese Academy of Sciences , Beijing 100817 , {3. 4. Beijing University of Science and Engineering , Beijing 100083. {3. Corresponding author The research center of Mineral Resources exploration Chinese Academy of Sciences Beijing China Institute of Geology Chinese Academy of Sciences Beijing China Institute of High Energy Physics Chinese Academy of Sciences Beijing China Beijing University of Science and Engineering Beijing China

Neutron activation analysis after preconcentration of nickel sulfide fire assay was used in measurement of Ru, Ph, Pd, Os, Ir, Pt (i.e. PGE elements) and Au concentrations for basalt, mantle and granulite xenoliths in Hannuoba. The chondrite- and primitive mantle-normalized PGE patterns generally exhibit flat (for Iherzolite), negative slope (for harzburgite),

关键词： mantle xenolith granulite xenolith basalt platinum-group element Hannuoba.

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Risk analysis model for landslide mass of high slope in dam area

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Science china(Technological Sciences) 2008年第S2期51卷 25-31页

作者： GU ChongShi1,2,HE XianFeng3.4.WU ZhongRu1,2 & SU HuaiZhi1,2 1 College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,china 2 National Engineering research center of Water Resources Efficient Utilization and Engineering Safety,Nanjing 210098,china 3.Yellow River Institute of Hydraulic research,zhengzhou 4.0003.china 4.Embankment Security Defect Prevention and Control Engineering research center of MWR,zhengzhou 4.0003.china 1. College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China 2. National Engineering research center of Water Resources Efficient Utilization and Engineering Safety Nanjing 210098 China 3. Yellow River Institute of Hydraulic research Zhengzhou 450003 China 4. Embankment Security Defect Prevention and Control Engineering research center of MWR Zhengzhou 450003 China

In order to identify the threat of reservoir bank landslide to dam safety and reduce the risk of dam failure,impact factors of the landslide are *** concept of landslide risk degree is put forward to measure the threat of landslide to dam *** monotony of the landslide risk assessment function which changes with different affecting factors is analyzed *** on gene automatic programming,a data mining model of the landslide risk assessment function is constructed combined with impact factors of reservoir bank landslide on dam *** the assessment function of landslide risk has been excavated and established according to practical project information,which provides a valuable reference for analyzing the impact of landslide on dam risk.

关键词： landslide dam failure risk landslide risk

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