低渗透油藏菱形反九点井网不等缝长优化研究

在低渗透油藏开发中广泛使用菱形反九点井网,但针对不同位置生产井及注水井的裂缝缝长配比关系还缺少广泛深入的研究。基于长庆油田某低渗透油藏参数,建立了数值模拟模型,在菱形反九点井网中分别设置不同的边井、角井和注水井裂缝穿透比,研究不同裂缝配置模式对水驱开发效果的影响。流线模拟及数值模拟计算结果表明,在注水开发中,注水井缝长是影响油田产液量及水驱效果的关键因素;边井裂缝较角井裂缝更易见水,对油田综合含水影响较大,在菱形反九点井网中需要进行不等缝长优化设计;边井裂缝缝长对水驱效果的影响分为早、中、晚期(Ⅰ、Ⅱ、Ⅲ)曲线段,随着注水井裂缝穿透比增加,早期(Ⅰ)曲线段增长,中期(Ⅱ)曲线段缩短,而晚期(Ⅲ)曲线段变化较小;随着角井裂缝穿透比增加,采出程度逐渐增大,当角井裂缝穿透比较大时,存在“反转”现象;随着注水井裂缝穿透比增加,角井裂缝优化穿透比减小,而边井裂缝优化穿透比增加。该研究成果对于指导低渗透油藏菱形反九点井网裂缝优化设计,提高波及系数和开发效果具有重要的指导意义。     

济南市破损山体治理方法优化探讨

破损山体治理在全国范围内缺少成熟可借鉴的经验,该文通过对济南已完成的58座破损山体治理方案的研究,总结出如何选取破损山体最合理的治理方法,为类似地区破损山体治理方法的选取提供了理论依据。     

基于ArcEngine的基础地理信息系统的设计与实现

介绍了利用ArcEngine技术开发基础GIS软件的特点,重点讨论了在GIS软件中查询功能、缓冲区功能和注记随地图缩放功能的实现.     

Interaction of solitary waves with emergent, rigid vegetation

In this study, solitary wave interaction with emergent, rigid vegetation was studied numerically and experimentally. Laboratory experiments were carried out in a wave flume with vegetation models of different lengths and porosities; the Boussinesq equations with the effects of the vegetation being modeled by a quadratic drag law are used to simulate the wave scattering by and the wave propagation through vegetation. Effects of incident wave height, vegetation density, and vegetation length are discussed. An empirical expression for the mean drag coefficient of emergent, rigid vegetation is presented and compared with other available data. The results are useful for studying tsunami hazard mitigation by coastal forests.     

Geological and geochemical prediction on deeply-seated ore-bodies in Haigou gold deposit of Jilin,China

Lode 28 is the largest gold-bearing quartz vein in Haigou gold deposit,and the lode itself contains more than 30t of gold. Geochemical study shows that 12 trace elements related gold mineralization can be divided into 5 metallogenic factors(element assemblages) .The high values of F1,F2 and F4 together indicate overlapped of multiple stages of gold mineralization,revealing high potential of gold mineralization at depth;the single high value of F4 represents the root of an existing ore body while high values...     

Tsunami-induced scour at coastal roadways: a laboratory study

Coastal roads are lifelines for bringing emergency personnel and equipment into affected areas after tsunamis, thus careful thought should be given to how to make roadways safer from tsunamis. Scouring at roadways is the primary damage caused by tsunamis; however, tsunami-induced scouring and beach erosion are less understood compared to tsunami runup and tsunami inundation. A set of laboratory experiments are reported in this study on tsunami-induced scour at a road model situated on a sandy beach. Our experiments showed that the distance between the shoreline and a roadway, which varies with tides, was a key factor affecting the scour depth at the road. Having the coastal road at about half of the inundation distance is not the most ideal location. The depth of road embedment did not affect the scour depth in our experiments. It was also found that for typical tsunamis, the scour depth is unlikely to reach its equilibrium stage. The information reported in this study is useful for local authorities to assess potential tsunami damage of roads and to have a better plan for tsunami disaster relief.     

辽宁省海岸带主要河口区一万年来沉积速率及海平面波动情况

采用钻探手段,通过14C、OSL测年,利用4孔岩心,计算了辽宁省海岸带主要河口区一万年来沉积速率,并分析了海平面波动情况.研究表明,辽宁海岸带长期平均的河口海岸区的沉积速率较低.其中,辽东半岛东北部黄海海岸带鸭绿江平原全新世早期处于剥蚀环境,大洋河平原全新世平均沉积速率为1.4 mm/a,辽东湾北部下辽河平原全新世平均沉积速率为1.52 mm/a,辽西海岸带大凌河冲积扇全新世平均沉积速率为1.87mm/a.全新世Ⅰ海相层或海陆过渡相层总体上表现为一次海侵,与下辽河平原区盘山海侵相对应,但各地段海平面波动情况不尽一致.     

山西省降水与环流特征量及ELnino的关系

本文通过滑动相关普查方法，对山西30个代表站点的夏半年（6-11月）降水与前期74个环流特征量及北太平海海温月平均资料作逐点逐月普查相关分析，结果表明：上年7-10月的南方涛动指数及赤道东太平洋（ELnino区）海温与我省夏半年降水分别有很好的相关关系，它们的出现对山西夏半年降水影响是非常强的，同时还发现前期多个环流指数如太阳黑子、西太平洋副高与我省夏半年降水也有很好的相关关系。     

二阶精度广义非线性全局最优的偏移速度反演方法(英文)

如何快速、精确地利用叠前深度偏移进行偏移速度分析是勘探地震学的一项重要研究内容,针对该问题,本文提出一种二阶精度广义非线性全局最优的偏移速度反演方法。我们将首先去掉速度模型修正量与成象深度差呈线性关系的假设,推导出具有二阶精度的速度模型修正量计算公式,使每一次迭代得到的速度模型尽可能地接近实际模型;然后采用广义非线性反演方法反演获得对所有道集的全局最优的速度模型修正量,不仅极大地加快了收敛速度,而且反演过程中陷入局部极小的可能性也减小了。理论模型和Marmousi模型的处理结果表明:本方法精度高、处理速度快,提高了偏移速度分析方法的实用性和对复杂构造成像的准确性。