用于地震反射界面识别的瞬时相位复合属性     

乐友喜  江凡  问雪  杨丽  张阳  黄健良 《物探化探计算技术》2012,34(5):505-509,499

复地震道技术采用Hilbert变换通过求解实地震信号的解析信号,可将反映地震信号局部变化情况的地震波的瞬时振幅、瞬时相位和瞬时频率等信息分离开,瞬时相位是一种独立于地震振幅,并且不受其影响的地震属性参数,因此瞬时相位能更好地反映构造几何形态的细节.通过理论模型分析发现,瞬时振幅与极性反转前后地震记录的瞬时相位一阶差分之和进行加权,得到的复合属性可以较为准确、可靠地识别地震反射界面的位置,具有较好的应用效果.  相似文献   

基于D-S证据理论的地震多属性融合方法在煤层气富集区预测中的应用(英文)     

祁雪梅  张绍聪 《应用地球物理》2012,9(1):80-86

D-S证据理论为融合不确定信息提供了一条很好的思路。本文提出将D-S证据理论用于地震多属性融合的方法,首先在钻孔实测煤层气含量值的指导下优选对煤层气含量值变化敏感的地震属性,然后基于D-S证据理论对优选的地震属性进行融合处理,并将融合结果用于煤层气富集区的预测。实际应用效果表明:预测结果与钻孔实测煤层气含量值基本吻合,本文提出的基于D-S证据理论的地震多属性融合方法用于预测煤层气富集区是可行的。  相似文献   

基于地震信息的歧口18-1稀井网区储层预测     

郭太现  赵春明 《现代地质》2013,27(3):703-709

针对歧口18-1区块沙河街组扇三角洲储层砂体横向变化快的地质特征和稀井网的资料条件,应用工区的三维地震资料,采用地震属性分析、测井约束反演等方法,分层次开展歧口18-1沙河街组储层砂体空间分布的预测,确定了区块优质储层的分布规律。通过提取各种地震属性,在单井地震属性岩性标定的基础上,优选均方根振幅属性作为参数,确定了歧口18-1区块沙河街组扇三角洲有利相带的空间分布;据此,在扇三角洲内部应用测井约束反演技术预测优质储层的分布规律及其内部结构,为断块有利勘探目标的确定和开发方案的制定提供了地质依据。这种精度逐级提高的层次性储层预测技术,尤其适合稀井网、大井距条件下的海上油田优质储层的确定,可有效地降低开发风险。  相似文献   

GIS analysis to assess landslide susceptibility in a fluvial basin of NW Sicily (Italy)   总被引：10，自引：1，他引：9  

Christian Conoscenti  Cipriano Di Maggio  Edoardo Rotigliano   《Geomorphology》2008,94(3-4):325

Landslide hazard assessment, effected by means of geostatistical methods, is based on the analysis of the relationships between landslides and the spatial distributions of some instability factors. Frequently such analyses are based on landslide inventories in which each record represents the entire unstable area and is managed as a single instability landform. In this research, landslide susceptibility is evaluated through the study of a variety of instability landforms: landslides, scarps and areas uphill from crown. The instability factors selected were: bedrock lithology, steepness, topographic wetness index and stream power index. The instability landform densities computed for all the factors, which were arranged in Unique Condition Unit, allowed us to derive a total of three prediction images for each landslide typology. The role of the instability factors and the effects generated by the use of different landforms were analyzed by means of: a) bivariate analysis of the relationships between factors and landslide density; b) predictive power validations of the prediction images, based on a random partition strategy.The test area was the Iato River Basin (North-Western Sicily), whose slopes are moderately involved in flow and rotational slide landslides (219 and 28, respectively). The area is mainly made up of the following complexes: Numidian Flysch clays (19%, 1%), Terravecchia sandy clays (5%, 1%), Terravecchia clayey sands (3%, 0.3%) and San Cipirello marly clays (9%, 0%). The steepness parameter shows the highest landslide density in the [11–19°] class for both the typologies (8%, 1%), even if the density distributions for rotational slides are right-asymmetric and right-shifted. We obtained significant differences in shape when we used different instability landforms. Unlike scarps and areas uphill from crowns, landslide areas produce left-asymmetric and left-shifted density distributions for both the typologies. As far as the topographic wetness index is concerned, much more pronounced differences were detected among the instability landforms of rotational slides. In contrast, the flow landslides produce normal-like density distributions. The latter and the rotational slide landslide areas produce the highest density values in the class [5.5–6.7], despite an abrupt decreasing trend starting from the first class [3.2–4.4], which is generated by the density values of the rotational slide scarps and areas uphill from crowns. The stream power index at the foot of the slopes, which was automatically derived using a GIS-procedure, shows a positive correlation with the landslide densities marked by the maximum classes: [4.8–6.0] for flows, and [6.0–7.2] for rotational slides. The validation procedure results confirmed that the choice of instability landform influences the results of the susceptibility analysis. Furthermore, the validation procedure indicates that: a) the predictive models are generally satisfactory; b) scarps and zones uphill from crown areas are the most diagnostically unstable landforms, for flow and rotational slide landslides respectively.  相似文献   

低频数据体的属性提取在储层预测中的应用     

党丹  李金泉 《海洋地质前沿》2013,(12):65-70

在利用地震属性进行储层预测的过程中,由于地震数据受地下断裂或裂缝的影响,高频信息部分振幅损失严重,使得储层预测结果经常不能与真实储层的发育情况相吻合。提出利用地震数据的低频部分提取属性来预测储层,无论是在理论数据的试算还是在实际地震资料的应用中,都取得了较好的效果。证明了该方法的有效性,指导了地震解释工作的顺利进行。  相似文献   

地缘体概念内涵及特征研究   总被引：2，自引：0，他引：2  

张晶  刘建忠 《世界地理研究》2014,(4):50-55

地缘理论是在地缘政治、地缘经济、地缘文化、地缘科技等研究领域基础上构建的基础理论。地缘体是地缘问题的研究对象,是地缘理论研究的核心内容。论文在综合分析各地缘研究领域基础上,提出并明确了地缘体的概念与内涵,初步建立了地缘体类型体系,分析了地缘体空间、属性和时间等特征,并对地缘体的空间拓扑关系进行了简要描述,为地缘理论的建立奠定了基础。  相似文献   

基于高分辨率遥感影像的农村集体土地建设用地管理技术方法研究     

贾文珏  吴其斌  张敬波  陈建忠 《国土资源信息化》2012,(2):49-54

明晰集体土地产权,加快推进农村集体土地确权登记发证是当前国土资源管理中的一项重要任务。我国农村集体土地建设用地具有分布广、范围大、分散凌乱等特点,如果按照城镇地籍调查规程开展农村地籍调查,则面临着基础薄、任务重、投入高、时间紧等问题。为此,本文提出一套以高分辨率遥感影像为底图,快速绘制农村集体土地建设用地地块图形、并与实地丈量的边长、面积等属性数据关联、实现图属一体化管理的技术方法,并进行了精度评定试验。基于该技术开发了农村集体土地建设用地数据库建库工具和管理系统,实现了网络化农村集体土地建设用地管理,并在三个试点地区得到较好的应用。  相似文献   

基于分频融合地震属性的曲流带预测与点坝识别:以渤海湾盆地埕岛油田馆陶组为例^*          下载免费PDF全文

岳大力  李伟  王军  王武荣  李健 《古地理学报》2018,20(6):941-950

埕岛油田馆陶组发育典型的高弯度曲流河沉积。通过分频融合地震属性提取与优选、储层构型模式指导、动态响应特征约束等手段,对研究区海上稀井网条件下曲流带和点坝进行精细刻画。研究表明: (1)分频融合地震属性的储层预测方法提高了曲流带的预测精度,振幅类属性与砂体厚度相关性最好,以最大峰值振幅为最佳,相比原始地震属性,分频融合得到的最大峰值振幅属性更好地刻画了曲流带砂体边界与砂体厚度分布;(2)复合正韵律、砂体厚度大、紧邻废弃河道分布为点坝三大重要识别标志,与此相对应,点坝表现为高最大峰值振幅、高反演属性的地震响应特征,而废弃河道呈弯月状低振幅属性、“顶平底凸”的低反演属性特征;(3)在应用地震属性确定点坝位置的基础上,通过经验公式推算点坝跨度,可认知研究区点坝的规模,有效指导地下点坝识别,动态信息的约束也为点坝识别提供了依据。井震结合的曲流带及点坝识别方法可为相似油田构型分析提供借鉴。  相似文献   

东北七鳃鳗和日本七鳃鳗成体形态性状对体质量的影响分析   总被引：2，自引：1，他引：1  

李军  董彦娇  韩英伦  刘欣  宋涛  徐磊  逄越  李庆伟 《海洋学报》2017,39(4):61-71

为研究东北七鳃鳗和日本七鳃鳗形态性状对体质量的影响,测量314尾东北七鳃鳗和302尾日本七鳃鳗成体的体质量(Y)和全长(X_1)、躯干长(X_2)、尾长(X_3)、头长(X_4)、吻长(X_5)、眼径(X_6)、背鳍前长(X_7)、眼后头长(X_8)8个形态性状,运用相关分析、通径分析和回归分析方法,确定影响体质量的主要形态性状,建立体质量和形态性状的多元回归方程。分析结果显示:东北七鳃鳗和日本七鳃鳗体质量服从正态分布,体质量的变异系数最大,全长、躯干长、尾长、头长、吻长、眼径、背鳍前长和眼后头长8个形态性状均与体质量呈正相关(P0.01)。经偏回归系数检验,东北七鳃鳗全长、头长、眼径和眼后头长呈显著性水平(P0.05),其通径系数分别为0.636、0.202、0.060和0.105;日本七鳃鳗全长、吻长和眼后头长呈极显著性水平(P0.01),其通径系数分别为0.730、0.098和0.153。单个性状对体质量的决定系数中,东北七鳃鳗和日本七鳃鳗全长对体质量的决定系数最大。东北七鳃鳗和日本七鳃鳗形态性状的单独决定系数和两个共同决定系数的总和分别为0.855和0.857。建立以东北七鳃鳗全长、头长、眼径和眼后头长4个形态性状为自变量,体质量为因变量的多元回归方程:Y=1.502X_1+2.699X_4+8.554X_6+1.915X_8-41.547;日本七鳃鳗全长、吻长和眼后头长3个形态性状为自变量,体质量为因变量的多元回归方程:Y=4.895X_1+9.688X_5+6.973 X_8-157.460。东北七鳃鳗和日本七鳃鳗成体形态性状对体质量的分析为七鳃鳗优良亲本的人工选育以及其形态学研究提供参考依据。  相似文献   

Seismic architecture and seismic geomorphology of heterozoan carbonates: Eocene-Oligocene,Browse Basin,Northwest Shelf,Australia     

《Marine and Petroleum Geology》2017

Seismic characterization of Eocene-Oligocene heterozoan carbonate strata from the Browse Basin, Northwest Shelf of Australia, defines marked progradation of nearly 10 km. Stratal terminations and stacking subdivide the succession into mappable seismic units. Stratal architecture and seismic geomorphology varies systematically through the succession.Individual surfaces, discerned by toplap, onlap, and truncation, outline sigmoidal to tangential oblique clinoforms with heights of ranging from 350 to 650 m and maximum gradients between 8 and 18°. Sigmoidal clinoforms can include aggradation in excess of ∼200 m, prograde more than 500 m, and have slopes characterized by inclined, wavy to discontinuous reflectors that represent ubiquitous gullies and channels. In contrast, the overlying tangential oblique clinoforms include downstepped shelf margins, limited on-shelf aggradation (<100 m) and toplap, subdued progradation (<500 m), and continuous parallel inclined reflectors on the slope. Wedges of basinally restricted reflectors at toe of slope onlap surfaces of pronounced erosional truncation or syndepositional structural modification. The succession includes repeated patterns of seismic units that onlap, aggrade, and prograde, interpreted to represent sequence sets and composite sequences.The associations of shelf aggradation, shelf-margin progradation, and slope channeling within sigmoidal seismic units and the less marked progradation and channeling within tangential oblique seismic units contrast with the classic sequence model in which sediment delivery to the slope and pronounced progradation is favored by limited shelf accommodation. This distinct divergence is interpreted to reflect the prolific heterozoan production across the shelf during periods of rising and high base level when the shelf is flooded, perhaps enhanced by downwelling. Comparison with purely photozoan systems reveals similarities and contrasts in seismic stratigraphic heterogeneity and architecture, interpreted to be driven by distinct characteristics of heterozoan sedimentary systems.  相似文献