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Seismic Image Prediction of Cenozoic Reef-Banks in the Northwestern South china Sea

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Journal of Earth Science 2012年第4期23卷 597-611页

作者：陈平陆永潮王振峰陈雷 Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Zhanjiang Branch Company of CNOOC Limited

The Cenozoic reef-banks reservoir in Qiongdongnan （琼东南） basin is one of the most profitable targets worthy of prospecting in the deep water area of the northwestern South china Sea. In this study, the characteristics of organic reef-like reflectors in southern uplift area of Qiongdongnan basin are analyzed based on the latest 2D and 3D seismic data. It is found that reef-like reflectors in Qiongdongnan basin show high-amplitude moundy continuous reflection at the top and the bottom, chaotic reflection inside the reef-like reflector and there is obviously speed difference between reef-like reflector body and surrounding rock. Combining the geological setting of reef and comparative analysis, the reef-like reflectors are considered to be the reef-banks. Furthermore, the results show that there are three kinds of reef structures in the southern uplift area of Qiongdongnan basin： the fault controlling structure, the fault flexure structure and the carbonate ramp structure. Each structure has its own grow-units that can reveal the growth process of the reef in order. The distribution of reef-like reflec- tors in space shows an arc belt pattern. According to this, four reef arc belts are identified, and their spatial trends are thought to have a good relationship with the buried fault. The internal structure con- stitution and the growth state of reef-like reflectors are mainly controlled by the geomorphology and monsoon-ocean current. The result has an instructive significance to oil-gas exploration of organic reef not only in Qiongdongnan basin, but also even in deep water areas of the South china Sea.

关键词： northwestern South china Sea reef-like reflector structure constitute control factor.

Dimensions of modified Besicovitch-Eggleston sets

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Science china Mathematics 2006年第2期49卷 245-254页

作者： XIE Yuqiong & WEN Zhixiong Department of Mathematics, wuhan university of Technology, wuhan 4.0070, china School of Mathematics and Statistics, wuhan university, wuhan 4.0072, china Department of Mathematics Wuhan University of Technology Wuhan 430070 China School of Mathematics Statistics Wuhan University Wuhan 430072 China

We consider the variants of Besicovitch-Eggleston sets in symbolic spaces, and determine their fractal dimensions.

关键词： Besicovitch-Eggleston set fractal dimension symbolic space multifractal.

Metallogenic epoch and genesis of the gold deposits in Jiaodong Peninsula, Eastern china: a regional review

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Progress in Natural Science:Materials International 2007年第2期17卷 138-143页

作者： YANG Liqiang, DENG Jun, GE Liangsheng, WANG Qingfei, ZHANG Jing, GAO Bangfei, JIANG Shaoqing and XU Hao ( State Key Laboratory of Geological Processes and Mineral Resources, china university of geosciences, Beijing 100083, china Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of geosciences, Beijing 100083, china) [a]State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing China [b]Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing China

Gold deposits are characterized by multi-sources, superimposition, large scale and temporal-spatial concentration in Jiaodong Peninsula, Eastern china. In this paper, we review the history and the development of the study on metallogenic chronology and genesis of gold deposits, summarize the main features of superimposed metallogenesis, provide evidence of the Mesozoic complex metallogenic system, and point out some problems for further research of Jiaodong gold deposit cluster from a regional view. Although gold deposits are different in genetic types, ore-forming materials and geological settings, our research indicates that the accumulation and emplacement of the ore-forming materials are temporally-spatially concentrated on a large scale, and the main metallogenic epoch of Jiaodong gold deposits was concentrated in Mesozoic. Metallogenic chronology and geological-geochemical data indicate that there are two periods of gold mineralizations occurred in 130-110 Ma and 90-80 Ma respectively in Jiaodong ore cluster. The gold deposit cluster results from the superimposition of the polygenetic mineralization, and further study is needed to investigate the formation and evolution of the Mesozoic complex metallogenic system.

关键词： superimposed metallogenic system Mesozoic Jiaodong ore cluster.

Rate of strong consistency of quasi maximum likelihood estimate in generalized linear models

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Science china Mathematics 2004年第6期47卷 882-893页

作者： YUE Li & CHEN Xiru School of Mathematics and Statistics, wuhan university, wuhan 4.0072, china Graduate School, Chinese Academy of Sciences, Beijing 100039, china 1. School of Mathematics and Statistics Wuhan University 430072 Wuhan China 2. Graduate School Chinese Academy of Sciences 100039 Beijing China

Under the assumption that in the generalized linear model (GLM) the expectation of the response variable has a correct specification and some other smooth conditions, it is shown that with probability one the quasi-likelihood equation for the GLM has a solution when the sample size n is sufficiently large. The rate of this solution tending to the true value is determined. In an important special case, this rate is the same as specified in the LIL for iid partial sums and thus cannot be improved anymore.

关键词： quasi-likelihood function generalized linear models strong consistency

Dirichlet Problems for the Quasilinear Second Order Subelliptic Equations

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Acta Mathematica Sinica,English Series 1996年第1期12卷 18-32页

作者： Xu Chaojiang Department of Mathematics wuhan university wuhan, 4.0072 china Department of Mathematics wuhan university wuhan 430072 China

In this paper, we study the Dirichlet problems for the following quasilinear secondorder sub-elliptic equation, sum from i,j=1 to m(X~*(A(x,u)Xu)+sum from j=1 to m(B(x,u)Xu+C(x,u)=0 in Ω, u=φ on Ω,where X={X, …, X} is a system of real smooth vector fields which satisfies the Hrmander’scondition, A(i,j), B, C∈C~∞(■×R) and (A(x, z)) is a positive definite matris. We have provedthe existence and the maximal regularity of solutions in the "non-isotropic" Hlder space associatedwith the system of vector fields X.

关键词： Sub-elliptic equation Dirichlet problem A priori estimate

On the Markov equivalence of maximal ancestral graphs

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Science china Mathematics 2005年第4期48卷 548-562页

作者： ZHAO Hui, ZHENG Zhongguo & LIU Baijun School of Mathematical Sciences, Peking university, Beijing 100871, china Department of Statistics, Central china Normal university, {4. 4.0079, china 1. School of Mathematical Sciences Peking University 100871 Beijing China

Necessary and sufficient conditions for a maximal ancestral graph (MAnG)to be Markov equivalent to another MAnG and to a DAG are provided respectively. Also a polynomial-time algorithm for converting a MAnG into its e... 详细信息

关键词： maximal ancestral graph, Markov equivalence, minimal collider path, m-separation.

Rheological Strength of UHP Eclogite from Dabieshan: Evidences from High p-T Experiments

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Journal of Earth Science 2001年第3期 3-8页

作者： Zhang JunfengGraduate School, china university of geosciences, wuhan 43.074 Institute of Geophysics & Planetary Physics, university of California, Riverside, CA 92521, USAJin ZhenminFaculty of Earth Sciences, china university of geosciences, wuhan 43.074

We present here experimental study of the rheological properties of UHP eclogite from Dabie at a pressure of 3 GPa by utilizing the 5 GPa Griggs type piston cylinder apparatus. The rheological constitutive equation of eclogite is determined with a stress exponent of 3.4. an activation energy of 4.0 kJ/mol and a preexponential factor of 103.3. Our!study shows that: (1) As a typical two phase rock, the flow strength of eclogite depends on the proportions of the strong phase (garnet) and the weak phase (omphacite); (2) The plastic deformation of eclogite is dominated by dislocation creep; (3) Based on that eclogite has the same strength as the upper mantle harzburgite, our study suggests that the delamination of the subducting crust component from the underlying upper mantle is unlikely. Therefore, the stretching after the collision orogeny coupled with the upwelling of the upper mantle may play a more important role in the exhumation of UHP rocks.

关键词： UHP eclogite rheological strength dislocation creep high p T experiment delamination Dabieshan.

Irregular but Nonfractal Drums and n-Dimensional Weyl Conjecture

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Acta Mathematica Sinica,English Series 1995年第2期11卷 168-178页

作者： Chen Hua Department of Mathematics wuhan university wuhan, 4.0072 china Department of Mathematics Wuhan University Wuhan People's Republic of China

In this paper, we study the asymptotics of the spectrum of the Dirichlet （or Neumann） Laplacian in a bounded open set ΩRn（n≥1） with irregular but nonfractal boundary Ω. We give a partial resolution of the Weyl conjecture, i.e. for the counting function Ni（λ）（i=0: Dirichlet; i=i: Neumann）, we have got a precise estimate of the remainder term Ψi（λ）=φ（λ）-Ni（λ） for large λ, where φ（λ） is the Weyl term. This implies that for the irregular but nonfractal drum Ω, not only the volume |Ω|n is spectral invariant but also the area of boundary |Ω|n-1 might be spectral invariant as well.

关键词： Math Irregular but Nonfractal Drums and n-Dimensional Weyl Conjecture

Compressive fracture characteristics of Zr-based bulk metallic glass

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Science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 823-827页

作者： FAN ZhenJun,ZHENG ZhiYuan & JIAO ZengBao School of Materials Sciences and Technology,china university of geosciences,Beijing 100083,china 1. School of Materials Sciences and Technology China University of Geosciences Beijing 100083 China

The compressive fracture characteristics of Zr-based bulk metallic glass under uniaxial compression tests are *** zigzag rheological behavior is observed in the compression stress-strain curves of amorphous *** room temperature the uniaxial compression fracture takes place along the plane which is at a 4.-degree angle to the direction of the compressive *** microstructure of a typical fracture pattern is the vein network.A unique,finger-like vein pattern is found to exist at the fracture surface of Zr-based bulk metallic glass.

关键词： bulk metallic glass fracture surface compressive fracture