OBS广角反射地震及其意义

OBSwide angle seismic reflection and its significance

在蒸发岩、玄武岩等高阻抗岩层发育地区 ,常规反射地震往往难以获取高阻抗层以下的地层地质信息。而使用海底地震仪 ( OBS)进行广角反射地震测量 ,可较好地解决高阻抗层屏蔽问题 ,它是开展海上地质构造勘查的一种行之有效的方法。对 OBS广角反射地震法的原理 ,海上测量方法 ,资料处理 ,时间剖面解释及地下地质构造计算机模拟方法作了阐述 ,对 OBS广角反射地震勘探法的成功范例——苏伊士湾高蒸发岩发育区结晶基底勘探作一扼要介绍。

Itis difficultfor conventional reflection seismic surveys to getthe information of low velocity layers underlain high acoustic impedance layers,such as evaporites and basalts.Wide angle reflection seismic survey is a useful method to solve the problem. The paper is concentrated on the offshore wide angle reflection survey using ocean bottom seis- mography(OBS) ,including its principle,the deploymentof OBS,processing ofrecording data,interpretation of OBSprofiles,and modeling of sections.Lastly,the offshore OBS wide angle reflection survey in the Gulf of Suez,as a successful example in an area with highly-developed evaporites,in described.