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中国科学院地质与地球物理研究所2007学术年会

作者： Mingguo Zhai~(a,b,d,*),Qicheng Fan~c,Hongfu Zhang~(a,d),Jianli Sui~a,Ji’an Shao~e a Institute of Geology and geophysics,Chinese Academy of Sciences,beijing,100029,China b Key Laboratory of Mineral Resources.Chinese Academy of Sciences,beijing,100029,China c Institute of Geology,Chinese Seismological Bureau.beijing,100029,China d State Key Laboratory of Lithosphere Tectonic Evolution,beijing,100029,China c school of Earth and Space Sciences,Peking university,beijing,100871,China

Our recent studies show that the lower crust and lithospheric mantle in the eastern North China Craton(NCC) was thinned in the *** lower crust played a key role in the tectonic mechanism that led to lithospheric *** data from volcanic rocks and xenoliths support the idea that delamination of the lower crust and lithospheric mantle took place only along the northern and perhaps the southern margins of the NCC,and this was linked to post-collisional orogenic ***,it is difficult for the delamination process to act on the whole eastern NCC and remove 80-120 km of the *** crustal xenoliths in Mesozoic and Cenozoic basalts within the NCC arc of two *** is granulite-facies metamorphosed two pyroxene gabbros and eclogite-facies metamorphosed garnet pyroxenites formed at 140-120 *** other is Precambrian granulites that were strongly overprinted by Mesozoic ***-scale lower crustal replacement took place in the Mesozoic beneath the *** other words,some or perhaps most part of the present lower crust of the NCC is not *** present lowermost crust is mostly composed of Mesozoic meta-gabbros and *** late Jurassic,high-Sr granites in the NCC,which are compositionally similar to a dakite,probably formed by partial melting of the lowermost crust,leaving a residue of eclogite or garnet amphibolite.A hot upwelling mantle was necessary to partially melt the pre-existing lowermost crust and underplate magma in order to form the present lower *** eclogites could sink into the mantle,it is hard to imagine that there was a thick enough eclogite layer that could drag 80-120 km of the lithosphere into the asthenosphere beneath the NCC. Magmatic underplating seems to be a better alternative ***,the formation of the present lower crust through the underplating and replacement of the pre-existing one was closely related to lithospheric thinning,and represented a con

关键词： Lower crustal processes:Underplating Dclamination Lithospheric thinning North China

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Application of cylindrical linear phased array in casing borehole

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Chinese Journal of Acoustics 2010年第1期29卷 65-72页

作者： SHI Fangfang WU Xianmei KE Yijing ZHANG Bixing State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing 100190 school of geophysics and Oil Resource Yangtze University Jingzhou 434023)

An Ultrasonic Phased Array （UPA） transducer is presented for borehole imaging and casing inspection in acoustical logging. First, a Cylindrical Linear Phased Array （CLPA）, which is made up of numbers of piezoelectric elements distributed on the surface of a cylinder uniformly, is designed and fabricated. By transmitting and receiving acoustic waves using different groups of elements under the control of the electric system, the CLPA can gcan all area of the borehole wall dynamically and rapidly. Then the radiation and reflection acoustic fields of the CLPA are investigated theoretically in the casing borehole with defects. Finally, the experimental researches about ultrasonic scanning and imaging for the casing boreholes with defects have been conducted by the CLPA transducer. The experimental results consist well with the theoretical ones.

关键词： CLPA Application of cylindrical linear phased array in casing borehole

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裂缝性油藏高效压裂技术研究与应用

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西南石油大学学报（自然科学版） 2011年第4期33卷 121-124,196页

作者：王峰中国科学院地质与地球物理研究所北京朝阳100029 中国石油吉林油田分公司吉林松原138000

裂缝性油藏中天然裂缝的存在使得液体滤失量大,人工裂缝延伸扩展规律复杂,压裂施工砂堵率高,如何提高该类油藏压裂效果是油藏改造领域的重大难题。针对乾北—大情字井地区裂缝发育程度,压裂引起的储层污染等进行分析并开展高效压裂技术... 详细信息

裂缝性油藏中天然裂缝的存在使得液体滤失量大,人工裂缝延伸扩展规律复杂,压裂施工砂堵率高,如何提高该类油藏压裂效果是油藏改造领域的重大难题。针对乾北—大情字井地区裂缝发育程度,压裂引起的储层污染等进行分析并开展高效压裂技术研究,基于天然裂缝分布规律分析和油藏两个水平主应力差值与裂缝延伸净压力的关系,提出了实现支撑天然裂缝的条件和工艺技术措施;综合分析了压裂过程的伤害因素,研发出能有效降解压裂液残渣的中高温生物酶破胶剂。研究成果在乾北—大情字井地区16口井应用,增产效果明显,为裂缝性油藏压裂改造提供了新思路。

关键词：裂缝性油藏压裂生物酶乾北-大情字井地区

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带粒子滤波约束的PP-PS联合反演的稀疏解算法

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地球物理学报 2018年第3期61卷 1169-1177页

作者：王彦飞唐静耿伟峰王成祥中国科学院地质与地球物理研究所中国科学院油气资源研究重点实验室北京100029 中国科学院大学北京100049 西南石油大学地球科学与技术学院成都610500 中国石油集团东方地球物理勘探有限责任公司物探技术研究中心河北涿州072751

随着地震勘探目标从构造型油气藏向岩性油气藏的转变,地震勘探难度日益增大,这就要求从地震数据中获得更多可靠且具有明确地质含义的属性信息,并充分利用这些属性信息来对储层的岩性、岩相进行分析.AVO三参数反演能够从振幅随炮检距的... 详细信息

随着地震勘探目标从构造型油气藏向岩性油气藏的转变,地震勘探难度日益增大,这就要求从地震数据中获得更多可靠且具有明确地质含义的属性信息,并充分利用这些属性信息来对储层的岩性、岩相进行分析.AVO三参数反演能够从振幅随炮检距的变化信息中直接提取纵波速度、横波速度以及密度来估计岩石和流体的性质,进而对储层进行预测.然而,AVO反演本身是一个不适定的问题,加上地震纵波反射系数对横波速度和密度的不敏感,会造成单纯利用纵波地震数据进行反演的结果误差大.随着地震接收和数据处理技术的发展,越来越多的学者对PP-PS联合反演方法进行了研究并在实际资料中得以运用.融合转换横波地震数据的联合反演在一定程度上提高了反演的精度,降低了解的不稳定性.但是在信噪比较低的情况下,联合反演的效果受到了限制.本文从优化理论出发,提出了基于粒子滤波提供先验知识的l1范数约束极小化问题的稀疏解算法.并将上述方法运用到了不同的模型中,通过比较分析,证实了该方法在不同信噪比资料中的有效性和在信噪比较低情况下的优势.

关键词：联合反演粒子滤波正则化 l1范数稀疏解

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Mantle flow pattern and geodynamic cause of the North China Craton reactivation:Evidence from seismic anisotropy

Mantle flow pattern and geodynamic cause of the North China ...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Liang Zhao Seismological Laboratory,State Key Laboratory of Lithospheric Evolution,Institute of Geology and geophysics,Chinese Academy of Sciences,Beituchengxi Road #19,PO Box 9825,beijing 100029, China Mei Xue State Key Laboratory of Marine Geology,school of Ocean and Earth Science,Tongji {3., 123. Siping Road,Shanghai 200092,China

[1]We investigate the mantle flow pattern and geodynamic cause of North China Craton(NCC)reactivation using shear wave splitting measurements from 140 broadband *** a newly developed method for simulating wave propagation in a two-dimensional anisotropic medium,we first examined the influence of sedimentary structures on SKS splitting *** simulations show that a sedimentary layer,whether isotropic or anisotropic,significantly influences the waveform;however,the shear wave splitting parameters can be retrieved with negligible *** a result,this study included new splitting measurements at stations which were deployed within basins and not used *** 121 broadband stations that contribute valid splitting results,55 stations are newly added which were deployed within basins. This significantly improved the sampling coverage on the *** complicated spatial patterns of the splitting parameters indicate that complex upper mantle deformation has occurred in the *** obtain both deep kinematic and geometric information,we interpret our splitting measurements in the context of new high-resolution tomographic results for the *** comparing our observations with three end-member conceptual models(upwelling,wedge flow,and lithospheric delamination),we found that the observed anisotropy pattern beneath the NCC is not completely consistent with any of ***,we prefer a hybrid mantle flow model,where the subduction of the Pacific Plate causes a mantle wedge flow beneath the eastern Archean block and a regional upwelling beneath the central block which has been imaged as a low velocity anomaly in seismic *** we speculate that the subduction of the Pacific Plate,compared to the NCC-Yangtze Craton amalgamation and the India-Eurasian collision,is most likely the geodynamic cause of the reactivation of the NCC eastern block during the Late Mesozoic to Cenozoic.

关键词： North China Craton craton reactivation upper mantle deformation shear wave splitting

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Isotopic disequilibrium in ultrahigh-pressure and retrograde metamorphism of eclogite and gneiss from the Chinese Continental Scientific Drilling in the Sulu orogen,China:evidence from mineral Nd-Sr-O isotopic composition

Isotopic disequilibrium in ultrahigh-pressure and retrograde...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Wei Wang·Ren-Xu Chen·Fukun Chen·Yong-Fei Zheng Key Laboratory of Mineral Resources, Institute of Geology and geophysics, Chinese Academy of Sciences,100029 beijing,China CAS Key Laboratory of Crust-Mantle Materials and Environments,school of Earth Sciences, {3. of Science and Technology of China, 23.026 Hefei,China

Diffusion rates of Sr and O in minerals are often comparable while Nd has a lower diffusion rate during thermal overprint(s);thus,the O isotope systems between metamorphic minerals can serve as an indicator tevaluate whether equilibrium of Rb-Sr and Sm-Nd systems has been preserved in the metamorphic minerals that experienced retrograde *** study presents a combination of investigation on Sm-Nd,Rb-Sr,and O isotopic compositions of minerals separated from ultra-high -pressure eclogite and gneiss that were collected from the main hole of the Chinese Continental Scientific Drilling project located in the Sulu orogen,eastern *** isotopic compositions of minerals from gneiss and eclogite yield two temperature groups of 620-740 and 460-590℃, representing diffusion cessation of isotopic exchange during the eclogite-facies recrystallization and later amphibolite-facies retrograde ***-Sr mineral regressions of two eclogite samples give consistent Triassic ages of 244 Ma,corresponding to eclogite-facies metamorphism, while the same minerals do not yield meaningful Sm-Nd isochron *** phenomenon likely suggests that Rb-Sr isotopic equilibrium was achieved during eclogite-facies metamorphism and preserved during late amphibolite-facies *** contrast,Sm-Nd isotopic equilibrium between the minerals of eclogite was not achieved under UHP metamorphic conditions. Regressions of epidote and biotite of one gneiss sample give a Triassic Sm-Nd age of 243.3. Ma,corresponding to the time of the eclogite-facies metamorphism,and a Jurassic mineral Rb-Sr age of 187.5±1.8 *** results imply that fluids have played an important role to achievement of the Sm-Nd isotopic equilibrium during eclogite-facies metamorphism and re-equilibration of the Rb-Sr isotopic system during later retrograde overprint.

关键词： Ultrahigh-pressure metamorphism Eclogite Gneiss Sr-Nd-O isotopes Isotopic equilibrium

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Seismic velocity structures and detailed features of the D”discontinuity near the core-mantle boundary beneath eastern Eurasia

Seismic velocity structures and detailed features of the D”...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Yumei He~(a,b,*),Lianxing Wen~(b,c) a Key Laboratory of the Earth’s Deep Interior,Institute of Geology and geophysics,Chinese Academy of Sciences,beijing 100029,PR China b Department of Ceosciences,State university of New York at Stony Brook,Stony Brook,NY 11790,USA c {3. of Earth and Space Sciences,university of Science and Technology of China,Hefei,Anhui 23.026,PR China

Shear and compressional velocity structures and features of the D" discontinuity near the core-mantle boundary(CMB) beneath eastern Eurasia are studied based on forward waveform modeling and differential -travel-time analysis of ScSH-SH,sScS-sS,PcP-P and pPcP-pP ***-quality differential-travel-time analysis reveals two high-velocity patches spanning a width of 3.00 km and separated by a 3.0-km wide normal velocity *** maximum shear and compressional velocity perturbations reach 3.8%and 2.7%,*** data indicate that the D" discontinuity emerges in the high velocity patches and disappears in the normal-velocity ***,the features of the D" discontinuity,although constrained by rather sparse seismic data,vary from diffusive discontinuities in the eastern patch to sharp discontinuities in the western *** D" discontinuities occur at about 270 km above the CMB in the eastern patch with a shear velocity jump of 3.0-5.0%and a transitional depth of at least 100 km,and at 250 km above the CMB in the western patch with an abrupt shear velocity jump of 5.0%.A diffusive P wave discontinuity is also observed in the eastern patch with the similar features of the S wave *** inferred features of the D" discontinuity can be explained by the post-perovskite transformation in the lower *** observations that the D" discontinuities occur only in the high-velocity patches may be due to the effect of the positive Clapeyron slope of the post-perovskite transition,and the varying transitional depths of the D" discontinuity in the high-velocity regions may be caused by the compositional effects on the post-perovskite transition in the presence of strong variations of composition within the high-velocity *** high-velocity patches geographically correlate with the subduction of the Pacific and Indian plates in the past 3.-60 Ma,and the normal-velocity gap falls into the subduction gap between the Pacific and Indian plates

关键词： Seismic velocity structure Core-mantle boundary D"discontinuity Eastern Eurasia

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世界上最快回应大地震的汶川地震断裂带科学钻探

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地球物理学报 2018年第5期61卷 1666-1679页

作者：许志琴吴忠良李海兵李丽南京大学地球科学与工程学院南京210046 自然资源部深地动力学重点实验室中国地质科学院地质研究所北京100037 中国地震局地震预测研究所北京100036 中国地震局地球物理研究所北京100081

2008年5月12日汶川大地震之后,在青藏高原东缘龙门山地区实施了汶川地震断裂带科学钻探,这是目前世界上最快回应大地震的科学钻探,为地学家探索地震成因机制提供了极好的机遇.汶川地震断裂带科学钻探工程(WFSD)沿产生同震地表破裂的两... 详细信息

2008年5月12日汶川大地震之后,在青藏高原东缘龙门山地区实施了汶川地震断裂带科学钻探,这是目前世界上最快回应大地震的科学钻探,为地学家探索地震成因机制提供了极好的机遇.汶川地震断裂带科学钻探工程(WFSD)沿产生同震地表破裂的两条断裂带——龙门山的映秀—北川断裂和灌县—安县断裂共实施了6口科学群钻.其目标在于对钻孔的岩心、岩屑和流体样品进行多学科观察、测试和研究,揭示汶川地震断裂带的深部物质组成、结构、产出以及构造属性;探索地震过程中的岩石物理和化学行为、能量状态与破裂演化过程;认识汶川地震发生的应力环境、巨大的地震破裂产生及传播原因、地下流体在地震的孕育、发生、停止过程中的作用,从而检验和深入理解地震断裂发震机理.目前,汶川科钻项目已取得的部分重要成果如下:(1)查明了汶川地震断裂带结构、组成;(2)揭示了汶川地震过程中"热增压"为重要断裂弱化机制,提出断裂带内石墨可作为判断大地震发生的标志;(3.发现目前世界上最低的断层摩擦系数,并首次记录到大震后断裂带快速愈合信息;(4)重建龙门山的构造格架,提出汶川大地震发生的新的成因模式;(5)通过对汶川地震余震的精确定位、钻孔附近的地震台阵观测,确定了地震活动与龙门山断裂带不同区段的空间关系;揭示断裂带深部流体特征与地震活动的关系,为确定大震孕育过程提供深部流体活动行为的科学依据.

关键词：龙门山构造带 WFSD 汶川地震10周年地震机制构造格架

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龙门山灌县—安县断裂带断层泥低磁化率的矿物、化学响应和蠕滑作用环境

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地球物理学报 2018年第5期61卷 1782-1796页

作者：何祥丽李海兵张蕾王焕葛成隆曹勇白明坤李成龙叶小舟韩帅地球科学与资源学院中国地质大学(北京) 北京100083 自然资源部深地动力学重点实验室中国地质科学院地质研究所北京100037 自然资源部古地磁与古构造重建重点实验室中国地质科学院地质力学研究所北京100081

断层带内的流体不仅可以通过水岩反应改变断裂岩的矿物组成和化学成分,从而导致化学性质和物理性质的变化,而且可以影响或控制断裂带的变形行为.断裂带中岩石磁学特征是由特定化学环境下磁性矿物的种类和含量所决定的,因此,从矿物学和... 详细信息

断层带内的流体不仅可以通过水岩反应改变断裂岩的矿物组成和化学成分,从而导致化学性质和物理性质的变化,而且可以影响或控制断裂带的变形行为.断裂带中岩石磁学特征是由特定化学环境下磁性矿物的种类和含量所决定的,因此,从矿物学和地球化学角度探讨断裂岩的磁性变化,对揭示断层的变形行为和环境具有一定的指示作用.本文以汶川科钻WFSD-3.钻孔中龙门山灌县—安县断裂带断裂岩为研究对象,运用高分辨率磁化率测试、XRD矿物成分半定量分析、XRF元素扫描以及不同价态Fe元素含量分析等多种方法开展断层磁学变化和变形环境的研究.磁化率测试结果表明灌县—安县断裂带断层泥的磁化率值普遍低于对应的围岩磁化率平均值.结合前人研究成果表明造成该断层泥低磁化率异常的原因是在间震期的长期流体作用下,铁磁性矿物(例如磁铁矿)转变成顺磁性矿物(铁硫化物、菱铁矿或含铁的黏土矿物).新生铁硫化物和含铁黏土矿物是在间震期缓慢形成的,而黏土矿物含量的增加弱化了断层强度,促进断层蠕滑,这说明断层泥低磁化率异常可能指示了该断裂在间震期长期缓慢活动,即为蠕滑变形.断层泥中黄铁矿的发育和高Fe^(2+)和S元素、低Fe^(3.)的特征显示灌县—安县断裂作用环境通常是在低温、还原环境中进行的.这些结果与低磁化率值的相关性暗示断层泥低磁化率异常可能对活动断层的低温还原环境具有指示意义.

关键词：灌县—安县断裂带断层泥磁化率蠕滑 WFSD-3.

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Transverse instability and magnetic structures associated with electron phase space holes

Transverse instability and magnetic structures associated wi...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Aimin Du,~1 Mingyu Wu,~2 Quanming Lu,~(2,a)) Can Huang,~2 and Shui Wang~2 1 Institute of Geology and geophysics,Chinese Academy of Sciences,beijing 100029,China 2 CAS Key Laboratory of Basic Plasma Physics,school of Earth and Space Sciences, {3. of Science and Technology of China,Hefei,Anhui 23.026,China

Electron phase space holes(electron holes) are found to be unstable to the transverse instability. Two-dimensional(2D) electromagnetic particle-in-cell simulations are performed to investigate the structures of the fluctuating magnetic field associated with electron *** combined actions between the transverse instability and the stabilization by the background magnetic field (B=Be) lead a one-dimensional electron hole into several 2D electron holes which are isolated in both the x and y *** electrons trapped in these 2D electron holes suffer the electric field drift v=E×B/B due to the existence of the perpendicular electric field E,which generates the current along the z ***,the unipolar and bipolar stmctures are formed for the parallel cut of the fluctuating magnetic field along the x and y directions,*** the same time,these 2D electron holes move along the x direction,and the unipolar structures are formed for the parallel cut of the fluctuating magnetic field along the z direction.

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