Correlation analysis of statistical facies fault models

Doklady Earth Sciences - This paper addresses seismic imaging of fault zones and analysis of the seismic data with the use of the fault facies model developed at Uni Research CIPR. Simulated and...     

利用云南水管仪观测资料检测地球自由振荡

利用云南省数字化水管仪的观测资料,采用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2004年12月26日苏门答腊大地震激发的0S4～0S30基频球型自由振荡,并与前人的观测结果进行比较,同时对照了PREM模型的理论计算周期,发现水管仪观测与这三者符合得非常好,除0S4振型的观测周期和周期1、周期2、周期3的相对误差均大于0.3%外,其余的差别在3‰以下。研究表明,利用数字化水管仪观测资料的确可以提取到苏门答腊大地震激发的地球球型振荡,这就为地球自由振荡的研究提供了一种新的观测手段。     

Seismic dynamic monitoring in CO<Subscript>2</Subscript> flooding based on characterization of frequency-dependent velocity factor

The phase velocity of seismic waves varies with the propagation frequency, and thus frequency-dependent phenomena appear when CO₂ gas is injected into a reservoir. By dynamically considering these phenomena with reservoir conditions it is thus feasible to extract the frequency-dependent velocity factor with the aim of monitoring changes in the reservoir both before and after CO₂ injection. In the paper, we derive a quantitative expression for the frequency-dependent factor based on the Robinson seismic convolution model. In addition, an inversion equation with a frequency-dependent velocity factor is constructed, and a procedure is implemented using the following four processing steps: decomposition of the spectrum by generalized S transform, wavelet extraction of cross-well seismic traces, spectrum equalization processing, and an extraction method for frequency-dependent velocity factor based on the damped least-square algorithm. An attenuation layered model is then established based on changes in the Q value of the viscoelastic medium, and spectra of migration profiles from forward modeling are obtained and analyzed. Frequency-dependent factors are extracted and compared, and the effectiveness of the method is then verified using a synthetic data. The frequency-dependent velocity factor is finally applied to target processing and oil displacement monitoring based on real seismic data obtained before and after CO₂ injection in the G89 well block within Shengli oilfield. Profiles and slices of the frequency-dependent factor determine its ability to indicate differences in CO₂ flooding, and the predicting results are highly consistent with those of practical investigations within the well block.     

不同砾石覆盖度戈壁床面风蚀速率定量模拟

通过风洞实验,利用称重传感器自动记录风蚀观测样方重量变化过程,对供沙条件下不同砾石覆盖度戈壁床面风蚀速率进行了定量模拟研究。结果表明:砾石覆盖度是影响戈壁风蚀速率的关键因子,戈壁床面风蚀速率随砾石覆盖度增加按指数规律递减。各实验风速下,砾石覆盖度>50%时,戈壁床面风蚀速率随砾石覆盖度增加而减小量有限,甚至无风蚀发生;而盖度从10%到50%时,风蚀速率显著减小。因此,两种实验粒径砾石(3 cm与4 cm)至少在50%盖度时才能达到较好的风蚀防治效果。戈壁风蚀防护机理主要是砾石覆盖度的增加增大了砾石间沙粒的临界起动剪切风速,而且减少了作用在砾石间可蚀地表的剪切压。与沙质对照床面相比,10%~90%砾石盖度戈壁床面沙粒临界起动剪切风速增大了0.8~3.4倍,只有0.5％~28%的剪切压作用在砾石间可蚀地表。     

福州温泉区地面沉降特点及影响因素分析

在掌握福州市地面沉降状况及其分布规律的基础上,分析得出引起地面沉降的主要原因是过量开采地下温泉;影响某点地面沉降年变化情况的主要因素有城市降雨量、温泉开采量等。     

Quantifying septic nitrogen loadings to receiving waters: Waquoit Bay,Massachusetts

Abstract

Waquoit Bay, a shallow bay on Cape Cod, Massachusetts, is exhibiting symptoms of eutrophication, largely attributed to septic nitrogen inputs. This study assessed septic nitrogen inputs by linking a three-dimensional ground-water model, a geographic information system (GIS), and a customized spatio-temporal nitrogen loading program. Owing to the slow speed of ground-water movement, the bulk of septic nitrogen entering the bay lags behind development by nearly a decade. Even if residential development is held at 1989 levels, nitrogen input from septic systems wilt increase by 36% over the current levels. At full residential build-out (i.e., development), septic nitrogen loading will eventually increase to more than twice the current levels.     

Preliminary investigation of seismic damage to two steel space structures during the 2013 Lushan earthquake

Severe damage to steel space structures is rarely reported when compared to other structural systems damaged during past major earthquakes around the world.Two gymnasiums of steel space structures in downtown Lushan County that were damaged during the 2013 M7.0 Lushan earthquake in China were investigated and the observations are summarized in this paper.Typical damage to these two steel space structures ranges from moderate to severe.Moderate damage includes global buckling and dislocation of bolted connections of truss members,and inelastic elongation of anchor bolts and sliding of pedestal plates of supports.Severe damage includes member fracture caused by local buckling,and fracture failure of anchor bolts and welds.The distribution of structural damage to these two structures is described in detail and future research opportunities are suggested.     

基于GIS和物联网的特种行业管理信息系统的设计与实现

针对我国特种行业的管理现状,提出一种结合GIS和物联网的特种行业管理信息系统的概念,阐述该系统的体系架构、主要功能模块及系统所涉及的三网融合、室内三维建模、智能GIS分析等关键技术,并重点介绍GIS技术和物联网技术在特种行业自动化、网络化、数字化管理方面的重要应用。     

街区式居民地多尺度表达不确定性分析

本文对街区式居民地多尺度表达的不确定性进行了分析,认为制图综合是街区式居民地多尺度表达存在不确定性的根本原因,并挖掘探讨了街区式居民地多尺度表达不确定性的本质及其分类。针对街区式居民地多尺度表达的各类不确定性,重点分析并确立了用街区式符号表达居民地时的不确定性类型及评价指标和方法。本文的研究成果可以应用于街区式居民地多尺度表达尺度转换方法优劣及产品不确定性的评估。     

A PRIMARY RECOGNITION ON THE CLIMATIC SIGNIFICANCE OF ICE CORE ISOTOPE RECORD IN NAIMONA'NYI OF WEST TIBETAN PLATEAU

纳木那尼冰川是喜马拉雅山西部地区规模较大的冰川之一,也是开展冰芯气候意义研究有重要潜在价值的冰川.但由于纳木那尼冰川位于西风环流和印度季风影响范围的交界带,不同的环流系统所输送的水汽带来不同的降水稳定同位素信号.因此确定纳木那尼冰芯同位素记录的气候意义是开展该地区冰芯气候记录研究的前提条件.2008年在该冰川积累区所钻取的8.78m浅冰芯为这一研究工作提供了可能.本文对该冰芯的稳定同位素记录以及普兰气象站的气象数据进行了分析与讨论.研究结果表明,同位素的年际变化与当地普兰县气象站气温的年际变化具有较好的对应关系.这可能与当地降水受到夏季季风的影响较小有关.测量结果表明早期的深冰芯钻取点位于冰川的消融区,而冰川的积累区仍位于冰川更高的区域,而且积累区冰川厚度更大,更有可能保存更长时间尺度的冰芯记录.这也为以后开展新的纳木那尼深孔冰芯及气候意义研究提供了借鉴.