石泉ML4．7级地震前天水深井水温的短临异常特征     

缑亚江刘东升  何松毅周建强 高曙德 《高原地震》2003,15(4):45-51

分析了天水台数字深井水温资料在陕西石泉ML4．7级地震前的异常特征，发现在震前5天内深井水温发生大幅度的降升变化，呈负脉冲形态，表现为典型的脉冲型前兆异常形态特征。  相似文献   

安塞油田坪桥水平井区沉积微相三维建模研究   总被引：4，自引：0，他引：4  

吴胜和  武军昌  李恕军  吴志宇 《沉积学报》2003,21(2):266-271

以安塞油田坪桥水平井区为例,探讨了应用水平井和露头资料及标点过程(示性点过程)方法进行沉积微相三维建模的思路与方法,同时对研究区三角洲前缘分流河道的定量结构模式进行了深入的研究。研究表明,坪桥水平井区三角洲分流河道单砂体宽度一般为40～100m左右。砂体结构呈两种模式,其一为“迷宫状”,砂体离散地分布于湖相泥岩中,其二为“拼合板状”,多个砂体在侧向上叠置而形成连片分布的砂体,但部分单砂体间可被泥质或钙质薄层侧积层所隔挡。应用水平井资料和露头资料,可有效地提取三维建模所必须的地质统计学参数。研究表明,采用标点过程方法,可建立符合地质实际的沉积微相三维模型。  相似文献   

冠县引黄井渠结合灌区机井建设浅议     

许静  宫延宏  黄启海  许刚 《地下水》2003,25(2):124-124,128

针对目前冠县引黄井渠结合灌区机井建设发展中主要存在机井发展不平衡、机井退化、老化、成井质量差等问题，因地制宜，提出了今后灌区发展机井建设的具体措施。  相似文献   

Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999——2001 in the northeast margin of Qinghai-Xizang block     

张希 江在森王琪  张晓亮 《地震学报(英文版)》2003,16(4):395-403

Through numerical simulation for GPS data, aseism/c negative dislocation model for crustal horizontal movement during 1999-2001 in the northeast margin of Qinghai-Xizang block is presented, combined with the spatial distri-bution of apparent strain field in this area, the characteristics of motion and deformation of active blocks and their boundary faults, together with the place and intensity of strain accumulation are analyzed. It is shown that: a) 9 active blocks appeared totally clockwise motion from eastward by north to eastward by south. Obvious sinistral strike-slip and NE-NEE relative compressive motion between the blocks separated by Qilianshan-Haiyuan fault zone was discovered; b) 20 fault segments (most of them showed compression) locked the relative motion between blocks to varying degrees, among the total, the mid-east segment of Qilianshan fault (containing the place where it meets Riyueshan-Lajishan fault) and the place where it meets Haiyuan fault and Zhuanglanghe fault, more favored accumulation of strain. Moreover, the region where Riyueshan-Lajishan fault meets north boundary of Qaidam block may have strain accumulation to some degree, c) Obtained magnitude of block velocities and locking of their boundaries were less than relevant results for observation in the period of 1993-1999.  相似文献   

空间点相对关系的精密检测     

田林亚  何江斌  张铎强 《测绘工程》2003,12(2):9-10,40

工业检测的精度一般要求很高，常规的检测手段难以达到。本文对空间点相对关系的精密检测方法和精度进行分析，实践表明该方法行之有效。  相似文献   

Diagenetic history and porosity evolution of Upper Carboniferous sandstones from the Spring Valley #1 well, Maritimes Basin, Canada–implications for reservoir development     

G. Chi  P. S. Giles  M. A. Williamson  D. Lavoie  R. Bertrand 《Journal of Geochemical Exploration》2003,80(2-3):171-191

Eighty-two core samples were collected from the Spring Valley #1 well which penetrates the Upper Carboniferous strata in the Late Devonian–Early Permian Maritimes Basin. The strata consist of alternating sandstones and mudstones deposited in a continental environment. The objective of this study is to characterize the relationship of sandstone porosity with depth, and to investigate the diagenetic processes related to the porosity evolution. Porosity values estimated from point counting range from 0% to 27.8%, but are mostly between 5% and 20%. Except samples that are significantly cemented by calcite, porosity values clearly decrease with depth. Two phases of calcite cement were distinguished based on Cathodoluminescence, with the early phase being largely dissolved and preserved as minor relicts in the later phase. Feldspar dissolution was extensive and contributed significantly to the development of secondary porosity. Quartz cementation was widespread and increased with depth. Fluid inclusions recorded in calcite and quartz cements indicate that interstitial fluids in the upper part of the stratigraphic column were dominated by waters with salinity lower than that of seawater, the middle part was first dominated by low-salinity waters, then invaded by brines, and the lower part was dominated by brines. Homogenization temperatures of fluid inclusions generally increase with depth and suggest a paleogeothermal gradient of 25 °C/km, which is broadly consistent with that indicated by vitrinite reflectance data. An erosion of 1.1–2.4 (mean 1.75) km of strata is inferred to have taken place above the stratigraphic column. δ¹⁸O values of calcite cements (mainly from the late phase) decrease with depth, implying increasing temperatures of formation, as also suggested by fluid-inclusion data. δ¹³C values of calcite cements range from −13.4‰ to −5.7‰, suggesting that organic matter was an important carbon source for calcite cements. A comparison of the porosity data with a theoretical compaction curve indicates that the upper and middle parts of the stratigraphic column show higher-than-normal porosity values, which are related to significant calcite and feldspar dissolution. Meteoric incursion and carboxylic acids generated from organic maturation were probably responsible for the abundant dissolution events.  相似文献   

黄壁庄水库副坝塌坑Ⅳ76+1槽段安全监测     

曹荣祥  李强  周启 《岩土力学》2003,(Z1)

介绍了黄壁庄水库副坝塌坑Ⅳ76+1槽段进行的安全监测设计及根据此设计进行的安全监测实施,根据取得的监测资料解决了一直未能确定的主要变形地层的问题,为水库的加固施工和后期的运行安全提供了一定的依据。  相似文献   

二维波动方程约束反演的大范围收敛广义脉冲谱方法   总被引：5，自引：3，他引：5       下载免费PDF全文

冯国峰  韩波  刘家琦 《地球物理学报》2003,46(2):265-270

针对二维波动方程，将大范围收敛的同伦 方法引入算子参数识别反演的过程，并结合求解不适定问题的Tikhonov正则化方法，设计了二维波动方程反演的大范围收敛广义脉冲谱方法，并利用测井资料进行了约束反演. 大量 的数值模拟结果以及抗噪实验均表明了方法的有效性.  相似文献   

地震勘探中的炸药震源药量理论与实验分析   总被引：5，自引：1，他引：5  

张智  刘财  邵志刚 《地球物理学进展》2003,18(4):724-728

炸药由于具有良好的脉冲特性及高能量的特点而作为地震勘探中的主要震源，就炸药本身来说，在地震勘探中药量、井深等参数的选取对激发能量和激发频率有很大的影响。为此，本文运用炸药爆炸理论，从炸药作功角度来加以论述，并通过理论和实验分析得出选取一个最佳的药量和井深激发，既能提高炸药作功能力，又能增强激发能量，从而激发强能量的高频震源子波，达到指导野外地震采集和节约经济成本的目的。  相似文献   

禾青井动水位对断层蠕动与慢地震过程的响应初析   总被引：3，自引：1，他引：3  

陈立军 《华南地震》1997,17(2):39-44

以湖南禾青井深井水位观测的异常图象为例进行定性分析，发现动水位观测有可能直接反映出断层的滑动或断层的慢地震过程，前者可能为地下水物理参量的观测与研究提供亲折思路，后者则可能对震源物理学的发展和地震预报水平的提高具有特殊的意义。  相似文献