Fracture analysis in the south-western Corinth rift (Greece) and implications on fault hydraulic behavior     

Luca Micarelli  Isabelle Moretti  Manon Jaubert  Hakim Moulouel 《Tectonophysics》2006,426(1-2):31

This paper reviews the data concerning the fracture network and the hydraulic characteristics of faults in an active zone of the Gulf of Corinth. Pressure gap measured through fault planes shows that in this area the active normal faults (Aigion, Helike) act, at least temporarily and locally, as transversal seal. The analysis of the carbonate cements in the fractures on both the hangingwall and the footwall of the faults also suggests that they have acted as local seals during the whole fault zone evolution. However, the pressure and the characteristics of the water samples measured in the wells indicate that meteoric water circulates from the highest part of the relief to the coast, which means it goes through the fault zones. Field quantitative analysis and core studies from the AIG-10 well have been performed to define both regional and fault-related fracture networks. Then laboratory thin section observations have been done to recognize the different fault rocks characterizing the fault zone components. These two kinds of approach give information on the permeability characteristics of the fault zone. To synthesize the data, a schematic conceptual 3D fluid flow modeling has been performed taking into account fault zone permeability architecture, sedimentation, fluid flow, fault vertical offset and meteoric water influx, as well as compaction water flow. This modeling allows us to fit all the data with a model where the fault segments act as a seal whereas the relays between these segments allow for the regional flow from the Peloponnese topographic highs to the coast.  相似文献   

CQK-50型车载化钻机的研制          下载免费PDF全文

孙建华赵海涛  张阳明王德平刘秀美  张永勤 《探矿工程》2006,33(11):41-44

在分析研究小型地质车载钻机的形式、功能与特点的基础上，提出了钻机车载化的新思路。根据地质调查工作现状，结合国内现有小型地质取样钻机，研制了CQK-50型全液压多功能车载取样钻机，并在野外物化探遥感异常验证钻探中取得了良好效果。  相似文献   

我国地质找矿取心（样）钻探设备现状及提高效能的分析研究          下载免费PDF全文

张永勤 《探矿工程》2006,33(8):45-50

概述了我国地质找矿钻探市场现状及前景，分析研究了地质取样钻探传统的立轴钻机及全液压动力头钻机的优缺点及综合效能，针对国家提出加强地质工作的形势及中国的实际状况，提出了完善和改进我国现有钻探设备、提高我国地质找矿取样钻探效率、降低能耗及成本的观点及建议。  相似文献   

冲击凿岩钎杆的瞬态动力学分析          下载免费PDF全文

周晔  张国榉 《探矿工程》2006,33(9):46-48

以ANSYS为平台，按照真实工作状态对凿岩钎杆进行了瞬态动力学分析，并对不同活塞形状下分析结果数据进行了比较，为冲击凿岩系统设计提供了理论依据。  相似文献   

Mineral and fluid inclusions in zircon of UHP metamorphic rocks from the CCSD-main drill hole: A record of metamorphism and fluid activity   总被引：18，自引：0，他引：18  

Zeming Zhang  Kun Shen  Yilin Xiao  Jochen Hoefs  J.G. Liou 《Lithos》2006,92(3-4):378-398

The Chinese Continental Scientific Drilling (CCSD) main drill hole (0–3000 m) in Donghai, southern Sulu orogen, consists of eclogite, paragneiss, orthogneiss, schist and garnet peridotite. Detailed investigations of Raman, cathodoluminescence, and microprobe analyses show that zircons from most eclogites, gneisses and schists have oscillatory zoned magmatic cores with low-pressure mineral inclusions of Qtz, Pl, Kf and Ap, and a metamorphic rim with relatively uniform luminescence and eclogite-facies mineral inclusions of Grt, Omp, Phn, Coe and Rt. The chemical compositions of the UHP metamorphic mineral inclusions in zircon are similar to those from the matrix of the host rocks. Similar UHP metamorphic P–T conditions of about 770 °C and 32 kbar were estimated from coexisting minerals in zircon and in the matrix. These observations suggest that all investigated lithologies experienced a joint in situ UHP metamorphism during continental deep subduction. In rare cases, magmatic cores of zircon contain coesite and omphacite inclusions and show patchy and irregular luminescence, implying that the cores have been largely altered possibly by fluid–mineral interaction during UHP metamorphism.

Abundant H₂O–CO₂, H₂O- or CO₂-dominated fluid inclusions with low to medium salinities occur isolated or clustered in the magmatic cores of some zircons, coexisting with low-P mineral inclusions. These fluid inclusions should have been trapped during magmatic crystallization and thus as primary. Only few H₂O- and/or CO₂-dominated fluid inclusions were found to occur together with UHP mineral inclusions in zircons of metamorphic origin, indicating that UHP metamorphism occurred under relatively dry conditions. The diversity in fluid inclusion populations in UHP rocks from different depths suggests a closed fluid system, without large-scale fluid migration during subduction and exhumation.  相似文献   

初至折射波静校正技术在复杂探区地震数据处理中的应用   总被引：1，自引：0，他引：1  

车建英  张伟 《中国煤田地质》2006,18(1):54-56

山区及黄土塬地区近地表结构复杂，地形起伏大、低降速带横向变化剧烈，地震资料处理中的静校正难度加大。长波长静校正容易引起构造形态畸变，短波长静校正影响地震剖面信噪比。针对此类问题，从长波长静校正问题及短波长地表非一致性问题分析入手，提出部分炮检距叠加识别长波长静校正技术及分段统计逼近地表非一致性校正技术。该技术在复杂地表区与其它相关技术综合应用，可有效解决长、短波长静校正问题。  相似文献   

PDC钻头在寺河煤矿瓦斯预抽放钻井中的应用   总被引：2，自引：1，他引：2  

吴小建  李新民 《中国煤田地质》2006,18(1):64-65,68

在寺河矿区一期瓦斯地面预抽放钻井施工中，使用传统的镶齿三牙轮钻头钻进，钻进速度低，仅为2.0m／h，且井斜不易控制、钻头寿命短、成本较高。通过对寺河煤矿地层特征的分析，在二期工程施工中，9#煤以上地层优选六翼内凹式PDC钻头钻进，采取一定技术措施并合理调整钻压、转速及泵量等钻进参数，钻速可达7．0m/h，井斜也得到有效控制，降低了钻井成本。  相似文献   

GIS工作流系统的长事务处理研究   总被引：3，自引：0，他引：3  

王华敏  沈志东 《测绘信息与工程》2005,30(3):23-24

分析了Sagas事务模型及空间数据版本树技术,设计了一种灵活的长事务补偿控制方案,为集成GIS,MIS及OA的工作流系统提供了有力的事务处理技术支持。  相似文献   

非等截面桩超声波成孔质量检测     

韩亮 《物探与化探》2005,29(2):185-188

分析了非等截面超声波成孔质量检测的几个主要影响因素,给出了相应得改进措施。用工程实例说明超声波反射技术是一种保证非等截面桩成孔质量和成桩质量必不可少的检测方法。  相似文献   

迭代折射静校正技术在鄂北地震资料处理中的应用     

许冬梅  曲安江  冯和平  闫立志 《物探与化探》2005,29(3):261-264

在低速层速度(地表直达波)已知的条件下,利用生产炮初至信息,用加权最小平方法和共轭梯度法建立的折射静校正数学模型,迭代求取长波长、短波长静校正量,在解决鄂尔多斯盆地北部的虚假小幅度构造问题及改善剖面质量方面取得了明显的效果。  相似文献