共查询到20条相似文献，搜索用时 15 毫秒
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This paper extends a previously developed three-part wedge method for the seismic stability analysis of the landfill with a triangular berm using pseudo-static method, and moreover, the translation failure condition of the landfill along under bottom of the berm is only presented. In the seismic impact zone, it is necessary to consider the impact of the seismic force on the stability of the landfill. Generally, apart from the horizontal seismic force, the landfill is also subjected to both upward and downward vertical seismic forces. The downward vertical seismic force has a positive impact on the seismic stability of the landfill, while the upward vertical seismic force is just opposite. Therefore, simply ignoring vertical seismic force, the seismic stability of the landfill will be overestimated or underestimated in the seismic condition. Besides, the seismic yield coefficient is calculated by assuming FSV = 2FS and the ratio of vertical seismic coefficient to horizontal seismic coefficient is equal to 2/3. 相似文献
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利用人工神经网络方法检测地震剖面同相轴 总被引：1，自引：1，他引：0
在地震勘探中,经过各种处理后最终得到用于解释的地震剖面实际上都可以看作是一些图像。这样,就可以从图像处理的观点来看问题,图像的特征有边缘和区域,那么,地震反射同相轴在地震剖面图像上,可以看作是一边缘。人工神经网络是近年来发展起来的一种新技术,它可以进行二维图像的边缘检测,基于这一点,把神经网络边缘检测技术应用到地震剖面上来检测地震反射界面,压制地震剖面上的随机干扰,从而改善地震图像的质量,达到提高地震资料信噪比和分辨率的目的。运用该技术对实际剖面进行了处理,效果很好,证明了方法的可行性和有效性。 相似文献
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Scale Matching with Factorial Kriging for Improved Porosity Estimation from Seismic Data 总被引：1，自引：0，他引：1
When seismic data and porosity well logs contain information at different spatial scales, it is important to do a scale-matching of the datasets. Combining different data types with scale mismatch can lead to suboptimal results. A good correlation between seismic velocity and rock properties provides a basis for integrating seismic data in the estimation of petrophysical properties. Three-dimensional seismic data provides an unique exhaustive coverage of the interwell reservoir region not available from well data. However, because of the limitations of measurement frequency bandwidth and view angles, the seismic image can not capture the true seismic velocity at all spatial scales present in the earth. The small-scale spatial structure of heterogeneities may be absent in the measured seismic data. In order to take best advantage of the seismic data, factorial kriging is applied to separate the small and large-scale structures of both porosity and seismic data. Then the spatial structures in seismic data which are poorly correlated with porosity are filtered out prior to integrating seismic data into porosity estimation. 相似文献
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基于地震波全波波动方程,分析了岩性地震勘探所依赖的岩性参数,并对岩性地震参数的反演方法进行了归类。通过分析岩性地震勘探技术中存在的问题,提出了对岩性地震勘探技术应用的要求,并进一步介绍了进行岩性地震勘探的方法及流程。 相似文献
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地震沉积学是地震地层学和层序地层学的延续发展。最近10多年来,地震沉积学研究受到人们的高度重视,在地震沉积学理论、陆相碎屑沉积砂体、海相沉积砂体、碳酸盐岩和混积岩刻画、地震成岩相预测、砂体精细表征和开发地质应用、地球物理新方法新技术、RGB(Red-Green-Blue)地震属性融合、储集层预测技术以及三维可视化技术雕刻地质体等10个方面取得了长足进展。未来地震沉积学应该关注地震地貌学理论模型、地震岩性学新方法、勘探地震沉积学、开发地震沉积学、地球物理反演新方法和人工智能技术等方面的研究,不断完善地震沉积学理论方法,拓展地震沉积学在油气勘探开发等领域的应用,助力油气勘探开发提高经济效益。 相似文献
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土石坝抗震安全的设计一般立足于预防结构的倒塌,如何使土石坝结构地震破损控制在可接受的风险水平是一个值得研究的重要课题。应用地震风险分析理论,建立了土石坝地震风险分析方法,包括地震危险性分析、地震易损性分析和地震灾害损失评估3个方面。在场地地震危险性分析基础上,将基于性能的抗震设计思想应用于土石坝结构地震易损性分析中,以土石坝坝顶相对沉陷为评价指标,划分土石坝震损等级,最后结合地震经济损失分析,建立了土石坝地震风险计算模型,在技术和经济上对土石坝地震破损风险进行分析计算。以某高土石坝为例,用该模型对大坝的震害和经济损失进行了预测分析,其结论可为土石坝安全评价及投资决策等提供依据。 相似文献
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The seismic sedimentology is a continuous development of seismic stratigraphy and sequence stratigraphy,and has been paid much attention in recent ten years,especially in its principle,continental and marine classic sedimentary sandbodies,carbonate and mixed deposits,prediction of seismic diagenetic facies,fine characterization of sandbodies,new geophysical methods and techniques,RGB fusion of seismic attributes,and 3D visualization carving geobodies,etc. The future development of seismic sedimentology should concentrate on seismic geomorphological model,new method of seismic lithology,seismic sedimentology for exploration and exploitation, geophysical inversion methods,and artificial intelligent technology,etc. The gradually improvement of theory and methods in seismic sedimentology as well as the extended application of seismic sedimentology in hydrocarbon exploration and exploitation will increase its economic efficiency. 相似文献
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Mapping and understanding distributed deformation is a major challenge for the structural interpretation of seismic data. However, volumes of seismic signal disturbance with low signal/noise ratio are systematically observed within 3D seismic datasets around fault systems. These seismic disturbance zones (SDZ) are commonly characterized by complex perturbations of the signal and occur at the sub-seismic (10 s m) to seismic scale (100 s m). They may store important information on deformation distributed around those larger scale structures that may be readily interpreted in conventional amplitude displays of seismic data. We introduce a method to detect fault-related disturbance zones and to discriminate between this and other noise sources such as those associated with the seismic acquisition (footprint noise). Two case studies from the Taranaki basin and deep-water Niger delta are presented. These resolve SDZs using tensor and semblance attributes along with conventional seismic mapping. The tensor attribute is more efficient in tracking volumes containing structural displacements while structurally-oriented semblance coherency is commonly disturbed by small waveform variations around the fault throw. We propose a workflow to map and cross-plot seismic waveform signal properties extracted from the seismic disturbance zone as a tool to investigate the seismic signature and explore seismic facies of a SDZ. 相似文献
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The Himalayas are one of very active seismic regions in the world where devastating earthquakes of 1803 Bihar–Nepal, 1897 Shillong, 1905 Kangra, 1934 Bihar–Nepal, 1950 Assam and 2011 Sikkim were reported. Several researchers highlighted central seismic gap based on the stress accumulation in central part of Himalaya and the non-occurrence of earthquake between 1905 Kangra and 1934 Bihar–Nepal. The region has potential of producing great seismic event in the near future. As a result of this seismic gap, all regions which fall adjacent to the active Himalayan region are under high possible seismic hazard due to future earthquakes in the Himalayan region. In this study, the study area of the Lucknow urban centre which lies within 350 km from the central seismic gap has been considered for detailed assessment of seismic hazard. The city of Lucknow also lies close to Lucknow–Faizabad fault having a seismic gap of 350 years. Considering the possible seismic gap in the Himalayan region and also the seismic gap in Lucknow–Faizabad fault, the seismic hazard of Lucknow has been studied based on deterministic and the probabilistic seismic hazard analysis. Results obtained show that the northern and western parts of Lucknow are found to have a peak ground acceleration of 0.11–0.13 g, which is 1.6- to 2.0-fold higher than the seismic hazard compared to the other parts of Lucknow. 相似文献
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Bayesian estimation of reservoir properties—effects of uncertainty quantification of 4D seismic data
Kjersti Solberg Eikrem Geir Nævdal Morten Jakobsen Yan Chen 《Computational Geosciences》2016,20(6):1211-1229
This paper shows a history matching workflow with both production and 4D seismic data where the uncertainty of seismic data for history matching comes from Bayesian seismic waveform inversion. We use a synthetic model and perform two seismic surveys, one before start of production and the second after 1 year of production. From the first seismic survey, we estimate the contrast in slowness squared (with uncertainty) and use this estimate to generate an initial estimate of porosity and permeability fields. This ensemble is then updated using the second seismic survey (after inversion to contrasts) and production data with an iterative ensemble smoother. The impact on history matching results from using different uncertainty estimates for the seismic data is investigated. From the Bayesian seismic inversion, we get a covariance matrix for the uncertainty and we compare using the full covariance matrix with using only the diagonal. We also compare with using a simplified uncertainty estimate that does not come from the seismic inversion. The results indicate that it is important not to underestimate the noise in seismic data and that having information about the correlation in the error in seismic data can in some cases improve the results. 相似文献
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这里介绍了一种提高地震波形绘制效率的方法。通过对读取地震数据、处理地震数据、显示地震数据这三个过程方法的改进,减少了数据处理和波形绘制的时间,提高了绘制地震波形的效率。 相似文献
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可靠地划分地震区可奠定地震预测与地震危险性评价的地质基础,具有十分重要的意义。笔者等通过研究分析指出板内孕震构造块体侧向边界可由区域性大断层或由区域性大断层与板块边界界定,底边界为康拉德面或低速高导层;板间孕震构造块体为俯冲板块,可由区域性大断层和(或)板块边界约束;在同一个孕震构造块体和同一轮地震周期的地震具有内在联系。因此,地震区可定义为代表相应孕震构造块体地震活动的区域,其可表征该块体内源自锁固段破裂的地震活动。基于笔者等提出的孕震构造块体和相应地震区边界确定原则,把全球两大地震带(环太平洋地震带和欧亚地震带)划分为62个地震区;每个地震区的分区方案均通过了多锁固段脆性破裂理论的检验,这说明方案可靠。进而,笔者等归纳总结了地震区划分方法。 相似文献
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相对于其它地球物理方法而言，地震反射方法的纵向分辨率较高，横向分辨率较低。为提高地震记录的横向分辨率，解决探测倾角较大的地层和复杂的地质构造及隐伏岩体等问题，在这里进行了地面地震层析技术的试验应用研究。针对非线性地面地震层析技术的基本原理进行了阐述，并就该方法对地震地质模拟记录和实际地震记录的反演结果进行了讨论。 相似文献
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时频域高分辨地震层序识别 总被引：5，自引：0，他引：5
地震信号频率随着时间的不稳定变化包含了地下反射层序特征的重要信息,时频分析是检测地震信号局部谱特征的重要工具。为适应实际地震信号处理,对S变换改进后得到一种新的广义S变换,用于分析和补偿地震信号的高频成分,得到了精细的地震层序识别剖面。实际资料处理表明,它对砂岩油气藏的成层特征的分析具有分辨率高和高信噪比的优点。地震信号的广义S变换时频谱分解可作为地震层序识别和解释的重要补充。 相似文献
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提高地震信号的分辨率是地震勘探要解决的一项主要任务,而提高地震信号的信噪比是提高地震信号分辨率的先决条件。要提高地震资料的信噪比,需要去除地震资料中的相干噪声和随机噪声。本文介绍了平稳小波变换结合阈值压制面波干扰的方法,通过实际地震记录的处理证实了该方法的有效性。 相似文献