Stress orientations in Brazilian sedimentary basins from breakout analysis: implications for force models in the South American plate   总被引：1，自引：0，他引：1  

Cláudio Lima  Edes Nascimento  Marcelo Assumpção 《Geophysical Journal International》1997,130(1):112-124

  相似文献   

渤海湾海陆交互相沉积的磁性地层学   总被引：23，自引：0，他引：23  

姚政权  郭正堂  陈宇坤  肖国桥  邵永新  王旭龙  郝青振  卢演俦 《海洋地质与第四纪地质》2006,26(1):9-15

渤海湾的海陆交互相沉积对研究海陆环境变化、新构造活动及华北平原的演化历史等均有重要意义,而建立可靠的年代地层框架是上述研究的前提。对取自渤海湾西岸天津市深度为203.57 m的BZ2钻孔进行了详细的磁性地层学研究,结果表明,钻孔岩心包含4个正极性段,分别可与标准极性柱中布容(Brunhes)、贾拉米洛(Jaramillo)、奥尔都维(Olduvai)和高斯(Gauss)正极性世对比;获得的3个负极性段则与松山(Matuyama)和凯纳(Kaena)事件对应,从而获得钻孔岩心底部年龄约为3.18 MaBP。磁性界限之间平均沉积速率的相对一致性,指示了渤海湾在晚上新世以来总体稳定的下沉趋势。  相似文献   

The Seafloor Borehole Array Seismic System (SEABASS) and VLF ambient noise     

R. A. Stephen  D. E. Koelsch  H. Berteaux  A. Bocconcelli  S. Bolmer  J. Cretin  N. Etourmy  A. Fabre  R. Goldsborough  M. Gould  S. Kery  J. Laurent  G. Omnes  K. Peal  S. Swift  R. Turpening  C. Zani 《Marine Geophysical Researches》1994,16(4):243-286

The Seafloor Borehole Array Seismic System (SEABASS) has been developed to measure the pressure and threedimensional particle velocity of the VLF sound field (2–50 Hz) below the seafloor in the deep ocean. The system consists of four three-component borehole seismometers (with an optional hydrophone). a borehole digitizing unit, and a seafloor control and recording package. The system can be deployed using a wireline re-entry capability from a conventional research vessel in Deep Sea Drilling Project (DSDP) and Ocean Drilling Project (ODP) boreholes. Data from below the seafloor are acquired either onboard the research vessel via coaxial tether or remotely on the seafloor in a self-contained package. If necessary the data module from the seafloor package can be released independently and recovered on the surface. This paper describes the engineering specifications of SEABASS, the tests that were carried out, and preliminary results from an actual deep sea deployment. VLF ambient noise levels beneath the seafloor acquired on the Low Frequency Acoustic-Seismic Experiment (LFASE) are within 20 dB of levels from previous seafloor borehole seismic experiments and from land borehole measurements. The ambient noise observed on LFASE decreases by up to 12 dB in the upper 100 m of the seafloor in a sedimentary environment.  相似文献   

RTK与测深联合技术及其在近海工程勘查中的应用     

赵晓龙  孙永福 《海岸工程》2007,26(3):47-54

陆上勘查孔位海拔高程的测量工作多采用水准高程传递的方法。海上钻探孔位的海拔高程,由于海洋条件限制,此方法并不适合。为了满足近海工程勘察中测量孔位高程的实际需要,本文采用实时动态差分全球定位系统(GPS-RTK)技术和测深技术,组成RTK和测深仪联合作业系统来测量勘查孔位的标高,在实际近海海洋勘查中取得了良好效果,以便促进RTK技术在海洋工程建设中的应用。  相似文献   

电磁波随钻遥测技术在钻井中的应用与发展   总被引：4，自引：0，他引：4  

邵养涛  姚爱国  张明光 《煤田地质与勘探》2007,35(3):77-80

随着钻井技术的发展,需要了解的井下信息越来越多,泥浆脉冲随钻信息传输难以满足智能化钻井要求。钻井液气体较多时泥浆脉冲方法也难以应用,而电磁波随钻遥测技术作为一种替代技术近年来发展很快。概述了电磁波发射传输的基本方式,对比分析了螺线管发射、环形线圈偶合与直接偶合方法的特点。同时,简介了国外电磁波随钻测量技术发展史、应用情况及研究进展。  相似文献   

Comparison of several BHT correction methods: a case study on an Australian data set     

Bruno Goutorbe  Francis Lucazeau  Alain Bonneville 《Geophysical Journal International》2007,170(2):913-922

Bottom-hole temperatures (BHT) from oil exploration provide useful constraints on the subsurface thermal regime, but they need to be corrected to obtain the equilibrium temperature. In this work, we introduce several BHT correction methods and compare them using a large Australian data set of more than 650 groups of multiple BHT measurements in about 300 oil exploration boreholes. Existing and suggested corrections are classified within a coherent framework, in which methods are divided into: line/cylinder source; instantaneous/continuous heat extraction; one/two component(s). Comparisons with reservoir test temperatures show that most of the corrections lead to reliable estimates of the formation equilibrium temperature within ±10 °C, but too few data exist to perform an intercomparison of the models based on this criterion. As expected, the Horner method diverges from its parent models for small elapsed times (or equivalently large radii). The mathematical expression of line source models suffers from an unphysical delay time that also restrains their domain of applicability. The model that takes into account the difference of thermal properties between circulating mud and surrounding rocks—that is the two-component model—is delicate to use because of its high complexity. For these reasons, our preferred correction methods are the cylindrical source models. We show that mud circulation time below 10 hr has a negligible effect. The cylindrical source models rely on one parameter depending on the thermal diffusivity and the borehole radius, which are poorly constrained, but the induced uncertainty on the extrapolations remains reasonably low.  相似文献   

三门峡地区钻孔坍塌掉块的治理     

黄建宁 《中国煤田地质》2007,19(5):70-71

河南三门峡勘探区地质构造复杂,小断层多,岩石倾角大,其上部马头山砂岩层及下部泥岩、页岩层,极易发生孔壁坍塌掉块事故。在钻进施工中,根据发生坍塌掉块的不同情况,分别提出粘泥护孔、水泥护孔和泥浆护孔等处理方法,并采取相应钻进技术措施。经生产实践验证,该地区的施工处理方法及技术措施可有效预防孔内事故,提高钻效。  相似文献   

三维地质建模中虚拟钻孔的引入及其确定   总被引：1，自引：0，他引：1  

王润怀李永树  刘永和向中林 《地质与勘探》2007,43(3):102-107

三维地质建模中由于地质数据缺乏导致模型难以控制三维形体边界特征,直接影响到模型的实用价值.针对这一问题,文章引入了虚拟钻孔,用于增加数据点密度,有效控制三维形体边界.以地层受断层破坏为例,分别就地层与断层4种典型空间分布组合特征下虚拟钻孔的确定方法进行了研究,提出了相应解决方案.由于虚拟钻孔具有普通钻孔的性质,在数据存储方式、数据结构和表达方式等方面具有一致性,可以加快三维地质建模,提高建模精度.  相似文献   

政和星溪金矿留矿采矿法改进方案试验     

吴松 《福建地质》2007,26(3):167-171

介绍了政和星溪金矿矿山在采矿生产的过程中存在的问题,结合开采技术条件,提出了对原采矿法的矿房结构和底部结构进行改进的试验研究。结果表明,采场结构合理、回采率高、作业安全,经济效益显著。  相似文献   

3D定向钻孔雷达系统及应用     

王正成  侯胜利 《物探与化探》2007,31(1):86-89

3D 定向钻孔雷达系统能够对钻孔四周进行高精度三维成像,在单个钻孔中即可完成目标体距离、方位的探测,相对2D钻孔雷达具有探测精度高、速度快、深度大的优点.笔者对3D 定向钻孔雷达系统的工作和成像原理、技术规格进行了详细说明,并结合现场数据说明了其实际应用效果.  相似文献