地震初至波速度层析反演在多金属矿探测中的应用  

Application of Seismic First Arrival Tomographic Inversion on the Exploration of Polymetallic Mine

作　　者：李建国[1] 赵斌[1] 孙少伟[1] 周新鹏[1] 孙渊[2] 宋立芳[2] 黄琴[2] 项彪[3] 肖昆[3] 

机构地区：[1]山西省地球物理化学勘查院,山西运城044004 [2]长安大学地测学院,陕西西安710054 [3]中国地质大学地球物理与信息技术学院,北京100083

出　　处：《现代地质》2012年第6期1218-1224,共7页Geoscience

基　　金：国土资源部"深部探测技术与实验研究专项"之子课题"南岭于都-赣县矿集区立体探测技术与深部成矿预测示范"(201011048)

摘　　要：多金属矿区由于含矿岩体结构与岩性的特殊性,地震反射波法一般应用效果较差。利用地面长排列接收到的初至波场信息建立初始速度模型,针对复杂地表和介质条件下,利用旅行时线性插值射线追踪方法(LTI方法)进行的初至波射线追踪正演模拟以及带松弛因子的联合迭代重建算法(SIRT)进行速度层析反演,获取与矿体或岩体的结构与岩性变化有关的速度场信息,以求解探测目标的分布范围和展布特征。结果表明,反演速度场中的异常变化带与地表地质调查结果中的矿体分布以及断裂构造吻合较好。因探测深度可达到数百米,可为浅层隐伏矿体和构造等的确定提供较可靠的依据,该方法技术可行。Since the particularity of the ore rock structure and lithology in multi-metal mining area,it＇s difficult for seismic reflection to form a continuous and stable and gentle reflecting interface,and the application of seismic reflection method are generally not effective.This paper established a initial velocity model by using the first break information which was received by means of the ground long arrangement,then utilized the first arrival ray tracing forward modelling and SIRT velocity tomographic inversion technique in the complex surface and medium conditions,which did not rely on the existence of the bed interface,to obtain the velocity field information about the structure and lithology changes of ore bodies or rock bodies,and then the distribution range and exhibition characteristics of the detection target were acquired.The testing results show that the method is feasible,and anomalous changes of the velocity inversion coincide with the results of geological survey.Since the detecting depth of this method can reach hundreds of meters,it could provide a reliable basis for the detection of shallow insidious ore bodies and structures.

关 键 词：多金属矿区 地震剖面 速度层析反演 岩体 

分 类 号：P631.4[天文地球—地质矿产勘探]