大容量气枪震源的实验与模拟研究  

Study of Experiment and Simulation of Large Volume Air-gun in Deep Structures Exploration

作　　者：唐杰[1] 王宝善[2] 葛洪魁[2] 陈颙[2] 

机构地区：[1]中国科学技术大学地球与空间科学学院,合肥市230026 [2]中国地震局地球物理研究所,北京100081

出　　处：《中国地震》2009年第1期1-10,共10页Earthquake Research in China

基　　金：国家自然科学基金项目(40730318和40574019);科技部社会公益重点项目(2005DIA3J117);地震行业科研专项(200808002);中国地震局地球物理研究所基本科研业务专项(DQJB07A01)资助

摘　　要：气枪震源是一种新兴、环保、绿色的人工震源,在区域尺度深部探测中有重要的应用前景。本文通过实验模拟研究了用于深部探测的大容量气枪震源,主要工作为:(1)根据陆上气枪实验分析了大容量气枪震源的特征;(2)采用自由气泡振荡理论模拟气枪信号,探讨深部探测中增强气泡效应从而增大气枪低频部分能量的方法;(3)研究气枪容量、工作压力和沉放深度等对单枪信号的影响及枪阵激发时刻和气枪间距对枪阵信号的影响,指导深部探测中气枪震源工作参数的选择;(4)研究不同类型水底对反射透射系数的影响,其结果对于选择合适的场地条件有指导意义。Air-gun source has important applications as a new, environmentally friendly, green active source in the regional scale deep exploration. In the past, air-gun source was used mainly in small- scale high-resolution shallow oil exploration, lack of adequate research in deep exploration. In order to study the selection of work parameters and field conditions of air-gun source in deep exploration, this paper does the following work： （1） Analyze the characteristics of air-gun source using air-gun experiment. （2） Simulate air-gun signal and air-gun-array signal based on the theory of free bubble oscillation, analyze the influence of the bubble oscillation, study the wavelet energy and spectrum characteristics needed in deep exploration. （3） On the basis of the theoretical simulation we study the influence of work parameter such as air-gun capacity, work stress and depth to air-gun signal. We analyze the influence of air-gun-array inspired moment and spacing of different air-gun to air-gun-array signal. （4） Study energy reflection and transmission coefficient for different underwater interface. This is very useful for choosing a suitable field conditions.

关 键 词：气枪源 子波模拟 气泡效应 参数选择 场地条件 

分 类 号：P315[天文地球—地震学]