太古宇潜山不同岩石类型裂缝发育潜力分析———以辽河西部凹陷为例   总被引：2，自引：0，他引：2  

蔡国刚  童亨茂 《地质力学学报》2010,16(3):260-270

太古宇结晶变质岩是潜山的重要储集层岩石类型, 然而对太古宇不同类型变质岩裂缝发育潜力的相对大小迄今还没有明确的标志。通过大量的岩石力学实验、岩心裂缝观测、成像测井资料分析和油田生产实践等相结合的方法, 探索分析太古宇不同岩石类型裂缝发育的相对潜力, 并提出了脆性系数(f_b)的概念。岩石力学试验结果表明, 太古宇不同岩性的岩石力学性质存在差异, 脆性系数总体有随暗色矿物增加而减小的趋势; 定向构造发育的片麻岩类岩石的力学参数与变形方向密切相关, 其中片麻理与加载方向夹角大于45°时的脆性系数f_b明显小于夹角小于45°时的脆性系数。大量生产实践资料表明, 定向构造发育的片麻岩类容易发育剪裂缝, 而定向构造不发育的粒岩类则容易发育张性裂缝。综合分析揭示, 不同岩性剪裂缝发育潜力从大到小的次序为:片麻岩类→混合花岗岩类→角闪岩; 不同岩性张性裂缝发育潜力从大到小的次序为:混合花岗岩类、浅粒岩→片麻岩类→角闪岩。   相似文献   

基于数字散斑技术的深埋隧道围岩岩爆倾向相似材料试验研究     

陈智强  张永兴  周检英 《岩土力学》2011,32(Z1):141-148

利用相似材料模拟方法,借助数字散斑观测技术,对深埋隧道围岩岩爆倾向进行试验研究。分析考虑材料强度、开挖速度和支护作用影响下的岩爆发生和破坏规律,寻求岩爆发生与深埋隧道变形破坏之间内在的联系。试验结果与现场实际发生岩爆强度较高的岩石类型花岗岩、闪长岩等相比,破坏特征相似,且围岩强度越高,岩爆发生可能性越大;在高地应力状态和完整岩体中开挖速度对岩爆的发生影响较大;锚网支护对隧道围岩变形有一定的控制作用,也可一定程度上避免岩爆发生。支护试验结果与现场实际支护效果一致,随支护强度提高,隧道抵抗力增加,整体变形减小、稳定性提高。所得试验结论为深埋隧道的合理设计和安全开挖提供技术指导和理论依据,对革新深埋隧道开挖技术和支护技术具有重要的意义  相似文献   

FAULT ACTIVITY OF THE SOUTHWESTERN SEGMENT OF THE EASTERN BRANCH OF XINYI-LIANJIANG FAULT ZONE IN GUANGDONG PROVINCE          下载免费PDF全文

ZHANG Long-sheng  ZHOU Ben-gang  JI Feng-ju  YANG Xiao-ping  AN Yan-fen 《地震地质》2016,38(2):316-328

The NE-trending Xinyi-Lianjiang fault zone is a tectonic belt, located in the interior of the Yunkai uplift in the west of Guangdong Province, clamping the Lianjiang synclinorium and consisting of the eastern branch and the western branch. The southwestern segment of the eastern branch of Xinyi-Lianjiang fault zone, about 34km long, extends from the north of Guanqiao, through Lianjiang, to the north of Hengshan. However, it is still unclear about whether the segment extends to Jiuzhoujiang alluvial plain or not, which is in the southwest of Hengshan. If it does, what is about its fault activity? According to ‘Catalogue of the Modern Earthquakes of China’, two moderately strong earthquakes with magnitude 6.0 and 6.5 struck the Lianjiang region in 1605 AD. So it is necessary to acquire the knowledge about the activity of the segment fault, which is probably the corresponding seismogenic structure of the two destructive earthquakes. And the study on the fault activity of the segment can boost the research on seismotectonics of moderately strong earthquakes in Southeast China. In order to obtain the understanding of the existence of the buried fault of the southwestern segment, shallow seismic exploration profiles and composite borehole sections have been conducted. The results indicate its existence. Two shallow seismic exploration profiles show that buried depth of the upper breakpoints and vertical throw of the buried fault are 60m and 4~7m(L5-1 and L5-2 segment, the Hengshan section), 85m and 5~8m(L5-3 segment), 73m and 3~5m(Tiantouzai section), respectively and all of them suggest the buried fault has offset the base of the Quaternary strata. Two composite borehole sections reveal that the depth of the upper breakpoints and vertical throws of the buried segment are about 66m and 7.5m(Hengshan section) and 75m and 5m(Tiantouzai section), respectively. The drilling geological section in Hengshan reveals that the width of the fault could be up to 27m. Chronology data of Quaternary strata in the two drilling sections, obtained by means of electron spin resonance(ESR), suggest that the latest activity age of the buried fault of the southwestern segment is from late of early Pleistocene(Tiantouzai section) to early stage of middle Pleistocene(Hengshan section). Slip rates, obtained by Hengshan section and Tiantouzai section, are 0.1mm/a and 0.013mm/a, respectively. As shown by the fault profile located in a bedrock exposed region in Shajing, there are at least two stages of fault gouge and near-horizontal striation on the fault surface, indicating that the latest activity of the southwestern segment is characterized by strike-slip movement. Chronology data suggest that the age of the gouge formed in the later stage is(348±49) ka.  相似文献   

硬夹层埋深对场地地震动参数的影响          下载免费PDF全文

张海  李克强  尤红兵  周泽辉 《地震工程学报》2016,38(6):935-941

选取某重要工程场地A3钻孔的厚度、剪切波速、密度等实际勘探数据,通过改变硬夹层的埋深,分析硬夹层不同埋深、不同地震时程对场地地震动参数的影响。研究结果表明:在硬夹层厚度不变和模型总厚度不变的情况下,地表水平向的峰值加速度随硬夹层埋深的增大而增大,但增幅逐渐减小;硬夹层埋深到达一定深度时不再影响地表水平峰值加速度;随着硬夹层埋深的增加,整个反应谱的谱值普遍增大。  相似文献   

河北张百湾中生代盖层下隐伏磁铁石英岩型铁矿床的勘查条件   总被引：2，自引：2，他引：0  

李健  贾大成  白雪山  李永占  裴尧  宋运红 《世界地质》2009,28(2):187-192

矿床勘查条件是寻找隐伏铁矿的基础。通过对河北张百湾隐伏铁矿勘查的, 归纳了寻找隐伏磁铁石英岩型铁矿的勘查条件。原始含矿建造是寻找隐伏铁矿的基础条件, 盖层的厚度和产状及岩性对寻找隐伏铁矿起限制作用, 断裂构造对隐伏铁矿起破坏作用, 但简单的差异性升降对隐伏铁矿勘查的影响程度不大。航磁异常是寻找隐伏铁矿的重要条件, 地面高精度磁异常是寻找隐伏铁矿的充分条件, 而对地面磁测数据的合理处理是了解深部磁性体产状变化和埋深的必要条件。  相似文献   

礁滩体与建设性成岩作用   总被引：9，自引：0，他引：9       下载免费PDF全文

张宝民  刘静江  边立曾  申银民  贾进华  张立平  曹宏  杨晓萍 《地学前缘》2009,16(1):270

礁、礁丘、丘同属碳酸盐建隆,礁、滩是重要勘探目的层。但各自在沉积组分、组构、环境和时空分布,以及油气地质条件上迥然不同,因而无论从理论还是勘探实践上,都有必要将其各成体系划分开来。礁滩自身为好储集岩,当建设性成岩作用叠加后可形成好的储层。碳酸盐岩优质储层形成,主要受沉积微相与建设性成岩作用两大因素控制。前者是基础,并以高能的礁滩相带为最好;后者主要包括破裂、白云石化和溶蚀三大类,并以白云石化或溶蚀为最优,其中的溶蚀分布最广泛、影响最深刻而对优质储层形成起决定性作用。礁滩储层中的古岩溶类型最为丰富多彩,包括同生期、准同生期、表生期和埋藏期热流体岩溶的所有类型,白云岩化礁滩体也不例外。其中,同生-准同生期岩溶的形成机制与礁滩沉积时高频层序旋回向上变浅序列的短暂暴露淋溶有关,表生期岩溶则受控于礁滩沉积后三级层序旋回Ⅰ型界面的暴露淋溶。由此,导致礁滩储层中除了可以也是(碳酸盐岩中)唯一保存原生孔隙外,还发育了次生溶蚀孔洞缝和大型溶洞。礁丘、灰泥丘尤其是丘间洼地中发育高有机质丰度烃源岩;它们自身没有有效的原生孔隙,但岩溶作用可以形成次生孔隙。  相似文献   

模糊层次综合评价在深埋隧道围岩质量分级中的应用   总被引：1，自引：0，他引：1  

谭松林  黄玲  李亚伟 《地质科技情报》2009,28(1)

针对现行隧道围岩分类中存在的"模糊性"问题,引进模糊层次分析模型,实现了围岩定性分类向定量分类的转变,经过工程实践取得了良好的效果.首先确定了影响隧道围岩质量的主要因素,如岩块坚硬程度、结构面发育程度、岩石质量指标以及地下水出水特征,然后建立了模糊评价模型,并采用层次分析法确定了各因素的权重,最后针对堡镇铁路隧道围岩采用模糊层次综合评价决策的数学模型所得到的结果对隧道各段岩体质量的级别进行了划分.  相似文献   

多属性融合定量储层预测方法研究与应用——以廊固凹陷杨税务潜山为例     

王成泉  王孟华  周佳宜  王盛亮  杨洲鹏  刘慧  张红文 《物探与化探》2022,(1):87-95

杨税务潜山位于廊固凹陷北部,裂缝孔隙型储层发育,地质综合研究表明该区处于油气运聚的有利方向,但由于其储层埋藏深,地震资料成像精度低,常规属性预测有效储层难度大,多解性强.本文在充分分析已钻井地球物理响应特征的基础上,优选了对有效储层响应敏感的3个属性——平均振幅、方差属性、弧长属性,并计算有效储层厚度与优选属性之间的相...  相似文献   

Centrifuge modeling of buried continuous pipelines subjected to normal faulting   总被引：1，自引：1，他引：0  

Majid Moradi  Mahdi Rojhani  Abbas Galandarzadeh  Shiro Takada 《地震工程与工程振动(英文版)》2013,12(1):155-164

Seismic ground faulting is the greatest hazard for continuous buried pipelines.Over the years,researchers have attempted to understand pipeline behavior mostly via numerical modeling such as the finite element method.The lack of well-documented field case histories of pipeline failure from seismic ground faulting and the cost and complicated facilities needed for full-scale experimental simulation mean that a centrifuge-based method to determine the behavior of pipelines subjected to faulting is best to verify numerical approaches.This paper presents results from three centrifuge tests designed to investigate continuous buried steel pipeline behavior subjected to normal faulting.The experimental setup and procedure are described and the recorded axial and bending strains induced in a pipeline are presented and compared to those obtained via analytical methods.The influence of factors such as faulting offset,burial depth and pipe diameter on the axial and bending strains of pipes and on ground soil failure and pipeline deformation patterns are also investigated.Finally,the tensile rupture of a pipeline due to normal faulting is investigated.  相似文献   

运用放射性水化学方法寻找隐伏铀矿体     

辛至秀 《国外铀金地质》2012,(2):92-98

着重介绍了放射性水化学方法寻找隐伏铀矿的过程：即,从找到放射性水化学异常点到放射性水化学异常晕,到初步评价和工程揭露。以放射性水化学找矿2个成果为例,说明放射性水化学方法是寻找隐伏铀矿的有效方法之一。  相似文献