黄土塬地区地震勘探激发技术研究  

THE SEISMIC EXCITING TECHNIQUE FOR THE SOIL YUAN AREAS IN ERDOS BASIN

作　　者：程洪涛[1] 黄用勤[1] 胡仁东 

机构地区：[1]中国地质大学地球物理与空间信息学院,武汉430074 [2]河南省交通工程定额站,郑州450052

出　　处：《工程地球物理学报》2005年第6期460-465,共6页Chinese Journal of Engineering Geophysics

摘　　要：在黄土塬地区,黄土层很厚,土质疏松,厚度纵横向变化剧烈,对地震波的吸收和衰减严重,而且还因含水程度及岩性差异产生明显的多次波以及沟塬之间巨大高差形成的次生干扰、侧面波等干扰波,记录信噪比极低。因而合理有效解决黄土塬地区的激发问题极具研究价值。对激发因素的选择采用了基于表层结构模型的激发参数选择方法,对工区范围内的激发条件划分区段,有针对性地选择激发方式和激发参数。针对鄂尔多斯盆地黄土塬地区的特殊地表地形特征,采取高精度的激发井深、药量和震源耦合的优化选取。其中激发井深选择采用定量分析方法,即在选定激发井深时考虑虚反射界面深度、地震信号频率与炸药爆炸半径的关系以及采取多井组合的方式。采用组合井方法不但可以有效提高下传能量,而且还可以提高有效波的振幅。In the Soil Yuan areas, the soil is very thick with loose texture and acute variation in thickness laterally and longitudinally that will seriously absorb and attenuate the seismic waves, which will result in low s/n ratio in the seismic data. Therefore, the reasonable and efficient solution of the excitation in the soil terrace areas becomes the most important issue for the seismic data acquisition. The development of the exploration, computer technique and special Microsoft supply the science methods to do the experiments of the exploration data, quantitative analysis, optimize parameter. Now, the selection of exciting parameters by the use of the near surface model method of exciting parameters in the different shooting part . To solve the problem coming from the special surface of the soil Yuan in the Erdos basin, we adopt the high precise well depth of shooting, charge and coupling optimizing selection. When adopting the method of quantitative analysis method, take account of the depth of reflecting interface, the frequency of seismic signal and the radius of blow relation and adopting multi-well array method.

关 键 词：黄土塬 激发参数 地震勘探 

分 类 号：P631.4[天文地球—地质矿产勘探]