巨厚黄土覆盖区表层地震信号衰减测量  

Measurement of Seismic Signal Attenuation for Surface in Very-thick-loess-covering Area

作　　者：梁向豪[1] 罗仁泽[2] 周翼[1] 陈猛[1] 张兴东[1] 黄有晖[1] 唐剑 

机构地区：[1]中国石油塔里木油田分公司勘探开发部,新疆库尔勒418000 [2]西南石油大学,四川成都610500 [3]中国石油川庆钻探工程有限公司井下作业公司,四川成都652185

出　　处：《天然气技术》2010年第5期1-3,共3页NATURAL GAS TECHNOLOGY

摘　　要：塔西南黄土地震勘探是一个世界性技术难题,形成该难题的最关键因素是巨厚黄土覆盖区表层低降速带对地震信号的严重衰减。为此,针对塔西南盆地柯东构造巨厚黄土覆盖区的地质情况,利用通信中信号系统传输原理,提出了一种利用VSP和微测井信息分析该区低降速带地震信号衰减规律的方法,并通过详细的理论推导和试验检验了该方法的有效性,揭示了地震信号在黄土低降速带传播时的衰减规律。Seismic exploration of loess in southwestern Tarim Basin is a worldwide tough problem. The key factor is a heavy attenuation of seismic signal induced by low-velocity layer of the surface in very-thick-loess-covering area. Therefore, in this study, according to the geologic condition of Kedong structure in the area and the signal transmission principle, a method using VSP and micro-logging data has been put forward to analyze the attenuation law. Through a detailed theory deduction and some experiments, the validity of the method has been verified. The attenuation law of seismic signal in low-velocity layer of loess is revealed also.

关 键 词：地震信号 衰减规律 低降速带 塔西南盆地 

分 类 号：P631.4[天文地球—地质矿产勘探]