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Forward Scattering Series for 2-Parameter Acoustic Media:Analysis and Implications to the Inverse Scattering Task Specific Subseries

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Communications in Computational Physics 2008年第1期3卷 136-159页

作者： Adriana Citlali Ram´ırez Einar Otnes M-OSRP Department of PhysicsUniversity of Houston77204-5005USA statoil research Center N-7005 TrondheimNorway.

We study the 2-parameter acoustic Born series for an actual medium with constant velocity and a density *** a homogeneous background we define a perturbation,the difference between actual and reference medium(we use background and reference as synonyms),which exhibits an anisotropic behavior due to the density *** an actual medium with a constant velocity,the reference velocity can be selected so that the waves in the actual medium travel with the same speed as the waves in the background *** theory decomposes the actual wave field into an infinite series where each term contains the perturbation and the propagators in the background ***,in this formalism,all propagations occur in the background medium and the actual medium is included only through the perturbations which scatter the propagating *** density-only perturbation has an isotropic and an anisotropic *** anisotropic component is dependent on the incident direction of the propagating waves and behaves as a purposeful perturbation in the sense that it annihilates the part of the Born series that acts to correct the time to build the actual wave field,an unnecessary activity when the reference velocity is equal to the one in the actual *** means that the forward series is not attempting to correct for an issue that does not *** define the purposeful perturbation concept as the intrinsic knowledge of preciselywhat a given term is designed to *** is a remarkable behavior for a formalism that predicts the scatteredwave fieldwith an infinite *** each order of approximation the output of the series is consistent with the fact that the time is correct because the velocity is always *** the density-only perturbation,the forward series only seeks to predict the correct ***,we extend the analysis to a wave propagating in a medium where both density and velocity *** selecting a convenient set o

关键词： Born series acoustics inverse scattering scattering acoustic modeling.

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A review on the performance of conventional and energy-absorbing rockbolts

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Journal of Rock Mechanics and Geotechnical Engineering 2014年第4期6卷 315-327页

作者： Charlie C.Li Gisle Stjern Arne Myrvang Department of Geology and Mineral Resources Engineering Norwegian University of Science and Technology (NTNU) Trondheim 7491 Norway statoil ASA Stavanger Norway

This is a review paper on the performances of both conventional and energy-absorbing rockbolts manifested in laboratory tests. Characteristic parameters such as ultimate load, displacement and energy absorption are reported, in addition to load-displacement graphs for every type of rockbolt. Conventional rockbolts refer to mechanical rockbolts, fully-grouted rebars and frictional rockbolts. According to the test results, under static pull loading a mechanical rockbolt usually fails at the plate; a fully-grouted rebar bolt fails in the bolt shank at an ultimate load equal to the strength of the steel after a small amount of displacement; and a frictional rockbolt is subjected to large displacement at a low yield load. Under shear loading, all types of bolts fail in the shank. Energy-absorbing rockbolts are developed aiming to combat instability problems in burst-prone and squeezing rock conditions. They absorb deformation energy either through ploughing/slippage at predefined load levels or through stretching of the steel bolt. An energy-absorbing rockbolt can carry a high load and also accommodate significant rock displacement, and thus its energy-absorbing capacity is high. The test results show that the energy absorption of the energy-absorbing bolts is much larger than that of all conventional bolts. The dynamic load capacity is smaller than the static load capacity for the energy-absorbing bolts displacing based on ploughing/slippage while they are approximately the same for the D-Bolt that displaces based on steel stretching.

关键词： Rockbolt Laboratory bolt testEnergy-absorbing rockbolt Yield rockbolt Pull testShear test Dynamic testDrop test

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井震深度差约束条件下的TTI介质速度建模方法

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石油物探 2018年第4期57卷 570-575页

作者：张钋汪道柳徐昇周洪波刘金俊 statoil Gulf Service Houston 77042

提出了一种TTI介质中井震深度差约束条件下的速度建模方法。针对空间中测井位置分布的稀疏性,通过引入一个所谓的"桥"函数,根据已知的地质构造将井位处地层的井震深度差信息延拓到整个模型区域,并将此拓展信息作为层析成像反演的约束条... 详细信息

提出了一种TTI介质中井震深度差约束条件下的速度建模方法。针对空间中测井位置分布的稀疏性,通过引入一个所谓的"桥"函数,根据已知的地质构造将井位处地层的井震深度差信息延拓到整个模型区域,并将此拓展信息作为层析成像反演的约束条件。该方法降低了TTI模型反演参数之间的不确定性,改善了反演算子的病态性,提高了层析成像反演的稳健性。SEAM人工模拟数据和墨西哥湾实际广角地震数据测试结果表明,井震深度差约束条件下的TTI介质速度建模方法的反演结果提高了深度偏移后地层定位精度,改善了共成像点道集中同相轴的拉平程度。

关键词：速度建模层析反演 TTI介质深度偏移共成像点道集井约束

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Reservoir Stochastic Modeling Constrained by Quantitative Geological Conceptual Patterns

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Petroleum Science 2006年第1期3卷 27-33页

作者： Wu Shenghe Zhang Yiwei Jan Einar Ringas Faculty of Natural Resource ＆ Information Technology China University of Petroleum Beijing 102249 China statoil Trondheim Norway

This paper discusses the principles of geologic constraints on reservoir stochastic modeling. By using the system science theory, two kinds of uncertainties, including random uncertainty and fuzzy uncertainty, are recognized. In order to improve the precision of stochastic modeling and reduce the uncertainty in realization, the fuzzy uncertainty should be stressed, and the ＂geological genesis-controlled modeling＂ is conducted under the guidance of a quantitative geological pattern. An example of the Pingqiao horizontal-well division of the Ansai Oilfield in the Ordos Basin is taken to expound the method of stochastic modeling.

关键词： Reservoir stochastic modeling geological constraints sedimentary facies

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Microstructure and hydrogen storage properties of as-cast and rapidly solidified Ti-rich Ti-V alloys

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Transactions of Nonferrous Metals Society of China 2012年第8期22卷 1831-1838页

作者： Suwarno SUWARNO Jan Ketil SOLBERG Jan Petter MAEHLEN Bente KROGH Bφrre Tore BφRRESEN Esther OCHOA-FERNANDEZ Erling RYTTER Mario WILLIAMS Roman DENYS Volodymyr A.YARTYS Department of Materials Science and Engineering Norwegian University of Science and TechnologyNO-7491TrondheimNorway Institute for Energy Technology P.O.Box 40NO-2027KjellerNorway statoil research centre RotvollN-7005TrondheimNorway University of the Western Cape Private Bag X17Bellville7535South Africa

The goal of the present work was to optimize the phase-structural composition and microstructure of binary Ti0.8-0.9V0.2-0.1 alloys with respect to their hydrogen sorption properties. Application of these alloys is for hydrogen absorption from gaseous mixtures containing substantial amounts of carbon monoxide （CO） at high temperatures. Irrespective of alloy composition, both α（HCP） and β（BCC） phases in Ti0.8-0.9V0.2-0.1 formed single phase FCC hydrides upon hydrogenation in pure H2. An in situ synchrotron X-ray diffraction study showed that only the β-phase transformed to the corresponding hydride when the alloy was hydrogenated in a mixture of H2＋10%CO. Rapid solidification （RS） of the alloy resulted in refined grain sizes both in the Ti0.8V0.2 and Ti0.9V0.1 alloys. Furthermore, RS was found to increase the β-phase fraction in Ti0.9V0.1, being twice larger than that of the as-cast alloy. Ti0.9V0.1 had a platelike microstructure as observed by scanning electron microscopy （SEM）, the plates were about 300 nm thick. The microstructure refinement resulted in a faster kinetics of H desorption as observed by temperature desorption spectroscopy （TDS）.

关键词： hydrogen storage Ti-V alloys rapid solidification synchrotron X-ray diffraction carbon monoxide

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用奇异值分解方法压缩地震叠加剖面

用奇异值分解方法压缩地震叠加剖面

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美国勘探地球物理学家学会第67届年会

作者： Patrick Waldemar Tage Rφsten Tor A.Ramstad 朱成宏 Norwegian University of Science and Technology （NTNU） NTNU and statoil research centre NTNU

奇异值分解（SVD）是一种对于可分离数据具有极好的能量压缩特性的自适应变换。因此, 把SVD用于地震叠加剖面也许是一种理想的选择。为了获得一个好的SVD压缩系统,必须找到变换（奇异向量）和变换系数（奇异值）的有效二进制表达式。在...

奇异值分解（SVD）是一种对于可分离数据具有极好的能量压缩特性的自适应变换。因此, 把SVD用于地震叠加剖面也许是一种理想的选择。为了获得一个好的SVD压缩系统,必须找到变换（奇异向量）和变换系数（奇异值）的有效二进制表达式。在本文中,我们给出一种SVD编码系统,它利用奇异向量的正交性确定奇异向量的一个参数表达式的最小数目。用概率分布函数最优化编码器来量化这些参数和奇异值。SVD编码器设计为完全控制每一图象块内的均方误差。这里提出的方法能够以30:1的比例压缩地震叠加剖面而不损失任何视觉信息。考虑到这种方法的新颖性,尽管从信噪比方面看它已被一种标准的JPEG图像编码器所超越,但这种结果应当认为是一个好的结果。

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SUMIC:北海多分量海底地震测量——资料的解释和应用

SUMIC:北海多分量海底地震测量——资料的解释和应用

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美国勘探地球物理学家学会第64届年会

作者： Eivind Berg 严建文 statoil research Center Norway

我们研究了一种被称作SUMIC（海底地震）的海底四分量数据采集新方法。研究步骤之一是在海底布置地震检波器,完成一条近海2D SUMIC地震剖面的测量。该测量是在北海的一个油藏上进行的,其主要目的是对深部的一个油藏单元进行成象,该油藏...

我们研究了一种被称作SUMIC（海底地震）的海底四分量数据采集新方法。研究步骤之一是在海底布置地震检波器,完成一条近海2D SUMIC地震剖面的测量。该测量是在北海的一个油藏上进行的,其主要目的是对深部的一个油藏单元进行成象,该油藏单元通过其上覆岩层中的气体通道。在以前所采集的常规3D拖缆地震测量数据上,这一成象问题很难解决。由垂直速度分量vz数据得到的储层层段的图象与由常规拖缆地震数据得到的图象上显示出相同的畸变,这是因为P波在通过气体通道传播时会出现散焦和衰减。根据纵测线横波的x分量数据我们得到了储层段的更合理的成象和解释。我们应用了海上地震测量中的横波初至时间,在储层构造顶部标定了一个地堑构造。储层中气体对横波的影响要比对纵波的影响小。挪威国家石油研究中心证实SUMIC测量方法是一种有效的方法,与常规的海上地震方法相比它具备许多优点。其结果表明,该技术对于确定勘探远景区和储层构造以及地层圈定等具有重大的战略意义。

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通过AVO反演进行岩性识别

通过AVO反演进行岩性识别

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美国勘探地球物理学家学会第65届年会

作者： Arild Buland Martin Landrφ Roger Sollie Mona Andersen Terje Dahl 朱铉 IKU Petroleum research Norway IKU Petroleum research Norway IKU Petroleum research Norway statoil research Center Norway statoil research Center Norway

对来自Troll东部油田的两个数据集应用了一种地层弹性反演算法。本文的目的在于从包含有储集层岩石在内的多层模型中得到P波和S波速度及密度的估计。并且,我们要用估计的参数来区分各层的岩性。正演模型是通过将子波与包括水底多次波、...

对来自Troll东部油田的两个数据集应用了一种地层弹性反演算法。本文的目的在于从包含有储集层岩石在内的多层模型中得到P波和S波速度及密度的估计。并且,我们要用估计的参数来区分各层的岩性。正演模型是通过将子波与包括水底多次波、传输影响、吸收和组合滤波影响的反射率相褶积来执行的。采用了阻尼高斯-牛顿算法使最小平方不吻合函数达到最小。反演在作了τ-p变换的 CMP道集上执行。反演结果表明所估计的Vp／Vs比与来自井中的岩性之间有很好的相关性。对砂岩,Vp／Vs比估计为1．6-2．0,对页岩则为2．1-3．0,在储集层中,Vp／Vs比在含气砂岩中估计为1．6,流体接触面之下为1．7,石灰岩具有与砂岩相类似的Vp／Vs比,但是可从高得多的声阻抗估值来区别。

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Has the Drake Passage Played an Essential Role in the Cenozoic Cooling?

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Atmospheric and Oceanic Science Letters 2010年第5期3卷 288-292页

作者： ZHANG Zhong-Shi YAN Qing WANG Hui-Jun Bjerknes centre for Climate research UniResearch Bergen N-5007 Norway Nansen-Zhu International research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The Drake Passage is the seaway between South America and Antarctica. It is widely believed that the thermal isolation effects caused by the opening of the Drake Passage played an important role in the abrupt cooling that occurred at the Eocene-Oligocene boundary in the Cenozoic. These effects are also thought to be independent of the geometry of the passage. Here, the authors demonstrate that the climate impacts of the Drake Passage depend on the passage geometry by comparing the climate's sensitivity to the opening of the Drake Passage under the present and the Early Eocene land-sea configurations. These experiments show that the thermal isolation effects caused by the passage are much stronger under the present land-sea configuration. In comparison, under the Early Eocene land-sea configuration, the weak anomalies in heat transport caused by the opening of the narrow and shallow Drake Passage are not strong enough to thermally insulate Antarctica. The climate effects of the Drake Passage on the Cenozoic cooling have been overestimated in previous sensitivity studies carried out using the present land-sea configuration. Thus, it is unlikely that the opening of the Drake Passage played an essential role in the abrupt Cenozoic cooling, especially in the abrupt cooling at the Eocene-Oligocene boundary.

关键词： Drake Passage land-sea configuration Cenozoic cooling

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Target-Oriented Inversion of Time-Lapse Seismic Waveform Data

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Communications in Computational Physics 2020年第6期28卷 249-275页

作者： Xingguo Huang Morten Jakobsen Kjersti Solberg Eikrem Geir Nævdal Department of Earth Science University of BergenP.O.Box 78035020 BergenNorway NORCE Norwegian research centre Postboks 225838 BergenNorway

Full waveform inversion of time-lapse seismic data can be used as a means of estimating the reservoir changes due to the *** the repeated computa-tions for the monitor surveys lead to a large computational cost,time-lapse full wave-form inversion is still considered to be a challenging *** address this problem,we present an efficient target-oriented inversion scheme for time-lapse seismic data using an integral equation formulation with Gaussian beam based Green’s function *** proposed time-lapse approach allows one to perform a local inversion within a small region of interest(e.g.a reservoir under production)for the monitor *** have verified that the T-matrix approach is indeed naturally target-oriented,which was mentioned by Jakobsen and Ursin[24]and allows one to reduce the compu-tational cost of time-lapse inversion by focusing the inversion on the target-area *** method is based on a new version of the distorted Born iterative T-matrix inverse scattering *** Gaussian beam and T-matrix are used in this approach to perform the wavefield computation for the time-lapse inversion in the baseline model from the survey surface to the target *** have provided target-oriented inversion results of the synthetic time-lapse waveform data,which shows that the proposed scheme reduces the computational cost significantly.

关键词： Waveform inversion time-lapse seismic seismic inverse scattering target-oriented inversion Gaussian beam based Green’s function

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