粤东河源盆地的深部构造、沉积序列与盆地演化     

张敏  李海龙  唐灵  祁士华  旷健  王文  张金龙 《地球学报》2024,45(3):291-308

粤东河源盆地是东南沿海规模较大的晚中生代—新生代陆相盆地之一,发育有较为完整的晚白垩世—新近纪地层。研究该盆地的深部构造、控盆断裂、沉积序列和盆地的形成发展,对于认识东南沿海晚中生代—新近纪的大地构造演化有重要意义。通过对野外地质调查、地球物理反射剖面和约两千米的地质科学钻探等数据资料的综合研究,查明了河源盆地为中生代—新生代沉积断陷盆地,地层结构清晰,沉积基底为早古生代地层,并建立了该盆地晚白垩世—新近纪的三阶段沉积序列;该盆地发育渐新世的火山岩,揭示了控盆边界断裂及内部构造发育特征,暗示了原型盆地的破坏发生于晚新生代:即盆地南北两侧紫金—博罗逆冲断层和河源断裂带在晚古近纪—新近纪强烈地改造了原型盆地;基于以上认识,初步恢复了河源盆地的形成演化历史,构建了河源盆地沉积序列-构造演化模式。  相似文献   

地下闭式循环地热交换发电系统简介     

周刚  李金锋  Helmut WOLFF  汤凤林 《地质科技情报》2006,25(4):105-108

为解决能源问题而提出了地下闭式循环地热交换发电系统.该系统地下部分通过全井下套管形成一个封闭系统,克服了传统地热发电和干热岩发电受地质条件制约、对环境造成危害等缺点,是一种新型的不依赖位置、环境友好的地热发电系统.采用大位移技术进行钻井,应用悬链线技术对井身剖面结构进行了优化,提出了地下连接技术要求,应用分支井和膨胀套管技术固井,设计了水泥配方并进行了相关试验,优化了载热流体,计算了有机工质朗肯循环(ORC)的发电效率.  相似文献   

激光钻进煤岩技术的研究进展     

王玉丹  罗耀坤  文国军  吴玲玲  官东林  姚邹 《煤田地质与勘探》2021,49(1):297-302

激光钻进技术是一种极具潜力的创新技术,也是钻探领域的研究热点。作为一种非接触式钻进技术,对破碎松软岩层扰动破坏小,将激光钻进应用于煤层气定向钻进中可发挥出非常明显的优势。梳理和总结了激光用于煤岩钻进的成孔机制、钻进效果的影响因素。在激光钻进过程中,激光与煤岩相互作用伴随着复杂的理化作用,指出激光钻进煤岩主要的成孔机制是烧蚀成孔。从激光参数、岩石性质、外部环境等方面阐述了影响激光钻进煤岩效果的因素,论述了激光钻进用于煤岩这一特定钻进对象的特殊现象和问题,指出煤岩在激光照射下,组分的挥发、热解、升华、烧结和氧化构成了煤岩在高温下主要的热烧蚀机制。从钻进机理、工艺、装置等方面着手,建议加强激光钻进煤岩的多物理场耦合作用机制、钻进工艺、钻进装置研制等适应性研究,为激光用于煤岩的高质高效钻进研究提供参考。   相似文献   

环保型弱凝胶护壁护心钻井液研究与应用     

李晓东 《地质与勘探》2024,60(3):581-591

海域浅层气地质调查和盐湖环境科学钻探在松散砂岩钻探取样工程中,存在孔壁易坍塌、成孔率低等技术难题,为此开展了松散砂岩地层环保型弱凝胶护壁护心钻井液技术研究。通过弱凝胶结构研究及成胶剂、交联剂及抗盐降滤失剂等材料优选,研发了一套环保型弱凝胶护壁护心钻井液,评价了钻井液的流变性、滤失性、抑制性、护心性能、环保性能等性能,并在山西某盐湖环境科学钻探工程进行现场应用。室内及现场应用结果表明：研制的弱凝胶护壁护心钻井液具有良好的流变性、降滤失性、抑制性（岩屑回收率96.3%）、护壁护心性能及环保性能（BOD5/COD比值24.6%,EC50值47950 mg/L）,能有效解决松散砂岩类地层孔壁坍塌、岩屑不易携带等问题,在松散地层钻探工程中具有广阔的应用前景。  相似文献   

山东省地质钻孔数据库成果统计分析与应用性研究          下载免费PDF全文

姜丽萍  彭雪峰  邱光辉  胡伟 《山东国土资源》2019,35(2)

重要地质钻孔数据库建设是"十二五"时期一项重要任务。山东省历时3年建立了重要地质钻孔基本信息数据库,将山东省内不同时代、不同单位、不同专业的各类地质钻孔资料进行统一的规范化、数字化、信息化管理。该数据库包含49107个地质钻孔的基本信息,通过"三图一表"的形式表达,其中工程布置图5510张,勘探线剖面图20686张,钻孔柱状图75711张,样品分析结果表116323张。部分钻孔数据在全国重要地质钻孔数据库服务平台面向公众开放。该文在已经取得的钻孔数据库成果的基础上,按照行业部门、工作程度、矿种、钻孔类型和钻孔深度5个方面进行了统计分析,以及在数据库的资料汇交、信息化建设、资源共享和城市地质工作方面的应用性进行了浅析。以期通过扩大汇交范围、采用新的技术手段、补充属性数据等方法,实现数据库二次开发利用,提高山东省地质资料数字化、信息化水平和服务功能,也为城市地质调查提供基础数据支撑。  相似文献   

焦家金矿带3000m科研深钻地球物理测井及初步分析          下载免费PDF全文

熊玉新  于学峰  迟乃杰  杨德平  王新娥 《山东国土资源》2018,34(5)

焦家金矿带3 000 m勘查科研深钻使用多种测井方法,原位获取了钻孔岩石的各种物理化学参数,实现了设计预定的数据采集目标,取得了丰富的初步解译研究成果。通过交会图等技术分析了不同岩石的测井响应特征;通过常规识别法和主成分分析方法相结合,有效的识别了断裂带;通过阵列声波测井了解了岩石机械特性并估算了地应力参数;通过井温测量实现了井温梯度的计算。激电测井显示,低阻高极化为深部矿化体主要异常特征;依据极化率曲线整体幅值及形态分析认为2 485~3 122 m为矿化较为集中部位。  相似文献   

EXPLORATION ENGINEERING     

《Abstract of Chinese Geological Literature》2014,(2)

正20141251Ban Junsheng(Central Laboratory,Second Geological Team,Henan Provincial Non-Ferrous Metals Geological and Mineral Resources Bureau,Pingdingshan 467021,China);Ren Jinxin Determination of the Magnetic Material Composition in Magnetite Ore  相似文献   

One-dimensional self-weight consolidation with continuous drainage boundary conditions: Solution and application to clay-drain reclamation     

Jianxue Feng  Pengpeng Ni  Guoxiong Mei 《国际地质力学数值与分析法杂志》2019,43(8):1634-1652

Traditional consolidation theories cannot provide good predictions of consolidation settlement in land reclamation because of their assumptions that the influence of soil's self-weight is often neglected, and the drainage boundary is considered as fully pervious/impervious. In view of these limitations, an analytical solution is derived for one-dimensional self-weight consolidation problems with a continuous drainage boundary using the finite Fourier sine transform method. Following the classical Terzaghi's small strain theory, the soil's self-weight is considered to produce consolidation settlement in dredged materials with a constant coefficient of consolidation. The continuous drainage boundary can essentially describe the time-dependent variation of drainage capacity at the interface between two adjacent soil layers. By reducing the interface parameters, the effectiveness of the calculation is demonstrated against the Terzaghi's solution. The influence of interface parameters and soil's self-weight stress coefficient on self-weight consolidation is discussed. As expected, the rate of consolidation considering the self-weight stress is faster, although the dependency of consolidation rate on the material property of void ratio is neglected. Moreover, the plane of maximum excess pore-water pressure is estimated as a function of time factor, based on which a design chart is developed to optimize the layout of horizontal drains in land reclamation.  相似文献   

Simulation of discrete cracks driven by nearly incompressible fluid via 2D combined finite-discrete element method     

Zhou Lei  Esteban Rougier  Antonio Munjiza  Hari Viswanathan  Earl E. Knight 《国际地质力学数值与分析法杂志》2019,43(9):1724-1743

In this work, we propose a novel hydraulic solver in order to simulate key mechanisms that control fluid-driven cracks in the framework of the combined finite-discrete element method (FDEM). The main innovative aspect of the present work is the independence of the fluid's critical time step size with the fracture opening. This advantage is extremely important because it means that very fine meshes can be used around areas of interest, such as boreholes, without penalizing the computational cost as fractures propagate (ie, open) and the fluid flows through them. This is a great advantage over other recently introduced approaches that exhibit a dependency of the time step in the form of Δt_crit ∝ (l/a)² where l is the element size and a is the fracture aperture. This paper presents a series of benchmark cases for the proposed solver. The rationale adopted by the authors was to benchmark and validate the implementation of the hydraulic solver in an incremental fashion, starting from the simplest cases and building in complexity. The results shown in this work clearly demonstrate that the proposed approach is able to reproduce analytical results for fluid flow through a single crack. The results presented in this paper also demonstrate that the new approach is robust enough to deal with complex fracture patterns and complex geometries; the obtained fluid-driven fracture patterns in the vicinity of a borehole certainly stand to the scrutiny of human visual perception.  相似文献   

DCMT枢轴误差的光电测定     

朱紫  李志刚 《时间频率学报》1993,(2)

枢轴误差是影响天体位置测量精度的重要因素.对于现代子午环的高精度天体测量而言,枢轴误差的精确测定是必不可少的.利用DCMT的自校准光源的像,并采用V形光栅的光电扫描直接测定DCMT枢轴误差在赤经和赤纬上的分量。通过几次测量结果的比较表明,该方法具有很高的测量精度与重复性.  相似文献