共查询到20条相似文献，搜索用时 234 毫秒
1.
随着计算机应用技术和地球物理信息处理技术的提高，帖邮票式的三维地震资料处理早已成为过去，地震资料连片处理由叠后时间偏移发展到叠前时间偏移连片，甚至有叠前深度偏移连片处理的趋势，然而，在实际的连片处理资料中，存在着不同年代、不同仪器、不同观测系统及不同网格的原始资料，本文就不同网格的实际生产资料进行叠前道内插方法研究，探索出一套在不同网格下做好叠前道内插的方法. 相似文献
2.
复杂地表条件下的成像研究是一直困扰地球物理学家的难题,对于该问题的一般做法是在解决静校正问题的基础上,在浮动基准面上进行成像。这种从浮动面开始偏移的方法,一般很难获得准确的速度模型,并且与实际情况有较大差距,在复杂地表条件下,无法对地下复杂构造进行准确成像。真地表叠前时间偏移技术是解决该问题的有效手段,为此,针对我国西部某复杂构造区,我们对真地表叠前时间偏移方法进行了研究和分析,在偏移过程直接解决静校正问题。应用真地表直接叠前时间偏移技术,对研究区三维地震资料进行了偏移处理,与老资料对比认为:在成果道集和成果剖面上反射波归位更准确;剖面波组特征清楚自然,构造成像清晰;通过地震资料解释分析,真地表直接偏移方法消除了由于静校正不合理造成的构造抬升,与钻井吻合,真地表偏移对复杂断块区小断裂的刻画能力更清晰,伴生断裂识别较好。综上认为,真地表叠前时间偏移方法,在复杂构造区是一种值得推广的方法。 相似文献
3.
四2区大部分三维地震野外资料品质较差,浅中深层资料讯噪比极低,面波、脉冲等干扰严重,在记录上几乎看不到有效反射信息,猝发脉冲噪声现象严重,三维地震资料束线多、变观现象严重。另外,地震资料多次波不发育,给处理带来了较大困难。本次采用FOCUS及GRISYS两套地震资料处理系统,进行叠前去噪、DMO叠加去噪、叠前F-X域预滤波、反褶积试验、三维RNA技术提高剖面信噪比以及PR分裂一步法偏移等处理方法,取得了很好的效果。 相似文献
4.
在三维地震资料处理中,由于中心点-偏移距-方位角空间分布不规则使得偏移结果存在成像假象,这中假象会影响到AVO分析的可行性。针对这种现象,本文对叠前数据进行振幅加权再进行叠前偏移,该方法在实际资料的应用,得到的资料更能体现含油储层振幅随偏移距增大而增大的AVO特征。 相似文献
5.
STN探区具有横向速度变化明显,信噪比不高,断裂系统复杂的特征,共炮域波动方程叠前深度偏移技术被认为是复杂构造区地震偏移成像的一个重要而有效的工具,该技术主要分为两步:第一步利用单程波动波动方程的检波点和炮点波场进行向下延拓;第二步为成像调整。结合Kirchhoff积分法偏移具有精细速度分析能力的优势和波动方程能够产生高精度成像的优势,并用于实际地震资料处理中。 相似文献
6.
本项目立项不久,为验证所开展理论研究的有效性,从各课题优选内容,提出直接介入大庆外围及深部油气储量预测工作的额外研究内容,旨在提升本项目的理论研究水平和应用价值。1998年研制集群计算机、研发叠前地震资料并行处理平台及辅助软件包,促成本项目与国际同步(2000年)生成“三维波动方程叠前深度偏移成像”算法及软件,提升了我国在勘探地球物理研究领域地震成像的能力。1999年,在大庆组装8个节点集群机,处理150km地震资料,在82线的深度剖面上,发现“凹中隆”内部结构和断裂特征。后经部署三维地震勘探及多项研究,大庆决定钻探“徐深1井”并获得重大突破,揭开了大庆发现大气田的序幕,极大地显现并提升了大庆油田的可持续发展空间。分别在北京和大庆两地设立“油储地球物理研究中心”,业已表明,合理的科研组织思路及举措,有利于重大项目成果的集成与应用,以及形成研究团队的群体突破态势。 相似文献
7.
针对梨树断陷构造复杂以及勘探现状等问题,对地震资料品质要求越来越高。通过叠前时间偏移预处理和关键参数的试验,保证偏移成果质量。叠前时间偏移处理后的资料三维构造形态合理,地质现象清楚,分辨率和信噪比有了较大提高,同相轴的连续性和断面也得到了改善,重新处理后的地震数据体能够满足实际生产应用的需求。 相似文献
8.
本次研究针对开发解释的需要,在深入细致分析原始资料的基础上,开发了炮点坐标快速重新定位、分频分域多次去噪和空间相对振幅补偿等多项新技术,在提高资料信噪比的基础上最大程度的保幅保真处理,使资料能量和覆盖次数得到了均衡,偏移画弧现象得到了抑制,提高了剖面成像质量,对三维地震资料叠前时间偏移的处理有很好的借鉴作用。 相似文献
9.
随着地震勘探的不断深入,许多新的技术难点也在不断出现,为煤田地震勘探技术的不断发展提出了许多新的技术挑战,常规的地震资料叠后处理技术存在各种局限性,已经不能够解决许多复杂区的地质问题,如在构造复杂区构造成像不清,大倾角地区无法成像等。近年来,针对构造复杂区及大倾角地区,常采用叠前时间偏移技术来解决构造复杂区构造成像及大倾角地区无法成像问题,并且取得了良好的效果。 相似文献
10.
本文基于单程波方程进行VSP正演模拟方法研究,该方法可以直接模拟出上行波,省去波场分离处理。用文中方法对不同模型的理论试算表明,地震合成记录的反射波清晰,没有多次波、直达波和其他干扰波,叠前深度偏移成像结果与地质模型完全吻合。 相似文献
11.
运用集群式并行机结构的软硬件特点,进行波动方程三维叠前深度偏移,已成为加速其庞大计算的有效工具。而集群式并行机节点之间的负载平衡,则是制约并行计算算法加速比的关键问题。提出运用索引排序方法以实现节点计算任务静态分配负载平衡,运用堆排序算法以实现节点计算任务动态分配负载平衡。分别以炮集域、频率域数据分解策略为例,展示负载平衡的实现过程。测试结果表明,负载平衡并行算法具有良好的并行效率。 相似文献
12.
针对新疆淖毛湖矿区深部构造复杂区段,应用三维地震叠前偏移技术实现了复杂构造的精确归位,提高了资料解释精度,使最终的地质成果可靠程度提高。 相似文献
13.
In this paper, we report a new method to incorporate 3D scaffold with electrotaxis measurement in the microfluidic device. The electrotactic response of lung cancer cells in the 3D foam scaffolds which resemble the in vivo pulmonary alveoli may give more insight on cellular behaviors in vivo. The 3D scaffold consists of ordered arrays of uniform spherical pores in gelatin. We found that cell morphology in the 3D scaffold was different from that in 2D substrate. Next, we applied a direct current electric field (EF) of 338 mV/mm through the scaffold for the study of cells’ migration within. We measured the migration directedness and speed of different lung cancer cell lines, CL1-0, CL1-5, and A549, and compared with those examined in 2D gelatin-coated and bare substrates. The migration direction is the same for all conditions but there are clear differences in cell morphology, directedness, and migration speed under EF. Our results demonstrate cell migration under EF is different in 2D and 3D environments and possibly due to different cell morphology and/or substrate stiffness. 相似文献
14.
K. Hockemeyer C. Janetopoulos A. Terekhov W. Hofmeister A. Vilgelm Lino Costa J. P. Wikswo A. Richmond 《Biomicrofluidics》2014,8(4)
Stromal cells in the tumor microenvironment play a key role in the metastatic properties of a tumor. It is recognized that cancer-associated fibroblasts (CAFs) and endothelial cells secrete factors capable of influencing tumor cell migration into the blood or lymphatic vessels. We developed a microfluidic device that can be used to image the interactions between stromal cells and tumor cell spheroids in a three dimensional (3D) microenvironment while enabling external control of interstitial flow at an interface, which supports endothelial cells. The apparatus couples a 200-μm channel with a semicircular well to mimic the interface of a blood vessel with the stroma, and the design allows for visualization of the interactions of interstitial flow, endothelial cells, leukocytes, and fibroblasts with the tumor cells. We observed that normal tissue-associated fibroblasts (NAFs) contribute to the “single file” pattern of migration of tumor cells from the spheroid in the 3D microenvironment. In contrast, CAFs induce a rapid dispersion of tumor cells out of the spheroid with migration into the 3D matrix. Moreover, treatment of tumor spheroid cultures with the chemokine CXCL12 mimics the effect of the CAFs, resulting in similar patterns of dispersal of the tumor cells from the spheroid. Conversely, addition of CXCL12 to co-cultures of NAFs with tumor spheroids did not mimic the effects observed with CAF co-cultures, suggesting that NAFs produce factors that stabilize the tumor spheroids to reduce their migration in response to CXCL12. 相似文献
15.
The explosive development of inertial microfluidic systems for label-free sorting and isolation of cells demands improved understanding of the underlying physics that dictate the intriguing phenomenon of size-dependent migration in microchannels. Despite recent advances in the physics underlying inertial migration, migration dynamics in 3D is not fully understood. These investigations are hampered by the lack of easy access to the channel cross section. In this work, we report on a simple method of direct imaging of the channel cross section that is orthogonal to the flow direction using a common inverted microscope, providing vital information on the 3D cross-sectional migration dynamics. We use this approach to revisit particle migration in both straight and curved microchannels. In the rectangular channel, the high-resolution cross-sectional images unambiguously confirm the two-stage migration model proposed earlier. In the curved channel, we found two vertical equilibrium positions and elucidate the size-dependent vertical and horizontal migration dynamics. Based on these results, we propose a critical ratio of blockage ratio (β) to Dean number (De) where no net lateral migration occurs (β/De ∼ 0.01). This dimensionless number (β/De) predicts the direction of lateral migration (inward or outward) in curved and spiral channels, and thus serves as a guideline in design of such channels for particle and cell separation applications. Ultimately, the new approach to direct imaging of the channel cross section enables a wealth of previously unavailable information on the dynamics of inertial migration, which serves to improve our understanding of the underlying physics. 相似文献
16.
为更好地满足储层建模系统三维可视化改进的需求,在研究软件三维显示功能的基础上,针对原有软件的特点,提出一种将原先只使用OpenGL库进行三维显示的系统改造成利用Open Inventor库与OpenGL库共同实现三维绘制功能的软件思路和实现方法。分析和总结了使用Open Inventor调用OpenGL常见的几种技术。结合储层建模的一般原理,将测井数据和地震数据资料的计算和储层模型的可视化功能进行了分离。 相似文献
17.
Sungmin Hong Pei-Hsiang Tsou Chao-Kai Chou Hirohito Yamaguchi Chin B. Su Mien-Chie Hung Jun Kameoka 《Biomicrofluidics》2012,6(2)
A simple microfluidic 3D hydrodynamic flow focusing device has been developed and demonstrated quantitative determinations of quantum dot 525 with antibody (QD525-antibody) and hemagglutinin epitope tagged MAX (HA-MAX) protein concentrations. This device had a step depth cross junction structure at a hydrodynamic flow focusing point at which the analyte stream was flowed into a main detection channel and pinched not only horizontally but also vertically by two sheath streams. As a result, a triangular cross-sectional flow profile of the analyte stream was formed and the laser was focused on the top of the triangular shaped analyte stream. Since the detection volume was smaller than the radius of laser spot, a photon burst histogram showed Gaussian distribution, which was necessary for the quantitative analysis of protein concentration. By using this approach, a linear concentration curve of QD525-antibody down to 10 pM was demonstrated. In addition, the concentration of HA-MAX protein in HEK293 cell lysate was determined as 0.283 ± 0.015 nM. This approach requires for only 1 min determining protein concentration. As the best of our knowledge, this is the first time to determinate protein concentration by using single molecule detection techniques. 相似文献
18.
复杂地区典型特征往往表现为近地表地质结构复杂,纵向、横向变化大,地下地质构造破碎,大倾角老地层出露。介绍了该类地区地震资料的主要特点;分析了处理好该类地震资料起决定性作用的静校正、去噪技术、频率补偿及偏移成像几个重要环节,并指出了生产中应注意的几个问题。 相似文献
19.
Tsutomu Harada 《Research Policy》2003,32(10):1737-1751
The purpose of this paper is to reexamine the role of gatekeeper in R&D organizations through the data collected from a midium-sized machine tool firm. Although the related literature points out (1) information gathering and (2) information transmitting functions as main roles of gatekeeper, this paper further suggests (3) knowledge transforming function that has to be executed within R&D organizations. We will argue that since the latter function often requires distinctive skills that impede information gathering activities, there emerges a three-step flow of communication instead of a two-step flow of communication. We define persons fulfilling this new role as a knowledge transformer, and related testable hypotheses are derived. The latter part of this paper proposes new measuring methods that identify knowledge transformers and test these hypotheses. 相似文献
20.
In this paper, 3D particle focusing in a straight channel with asymmetrical expansion–contraction cavity arrays (ECCA channel) is achieved by exploiting the dean-flow-coupled elasto-inertial effects. First, the mechanism of particle focusing in both Newtonian and non-Newtonian fluids was introduced. Then particle focusing was demonstrated experimentally in this channel with Newtonian and non-Newtonian fluids using three different sized particles (3.2 μm, 4.8 μm, and 13 μm), respectively. Also, the effects of dean flow (or secondary flow) induced by expansion–contraction cavity arrays were highlighted by comparing the particle distributions in a single straight rectangular channel with that in the ECCA channel. Finally, the influences of flow rates and distances from the inlet on focusing performance in the ECCA channel were studied. The results show that in the ECCA channel particles are focused on the cavity side in Newtonian fluid due to the synthesis effects of inertial and dean-drag force, whereas the particles are focused on the opposite cavity side in non-Newtonian fluid due to the addition of viscoelastic force. Compared with the focusing performance in Newtonian fluid, the particles are more easily and better focused in non-Newtonian fluid. Besides, the Dean flow in visco-elastic fluid in the ECCA channel improves the particle focusing performance compared with that in a straight channel. A further advantage is three-dimensional (3D) particle focusing that in non-Newtonian fluid is realized according to the lateral side view of the channel while only two-dimensional (2D) particle focusing can be achieved in Newtonian fluid. Conclusively, this novel Dean-flow-coupled elasto-inertial microfluidic device could offer a continuous, sheathless, and high throughput (>10 000 s−1) 3D focusing performance, which may be valuable in various applications from high speed flow cytometry to cell counting, sorting, and analysis. 相似文献