摘要
焉耆盆地西部,地表主要为岩石裸露区、戈壁区和巨厚低降速带区,接收和激发条件都较差,地下为逆冲推覆带,构造复杂,是地震勘探困难地区。以往在该区进行了多次地震勘探,解决不了推覆带的构造成像问题,本次二维地震勘探利用射线追踪理论的正演模拟方法,研究不同采集参数对构造成像的影响,结合试验资料的定量分析,确定激发井深、药量,使地震采集参数更加合理。采集资料经处理,推覆体成像清晰,逆冲断点、断面清楚。
In the western part of Yanqi basin, both receiving and shooting conditions are poor, as the surface is mainly covered by area with outcropped rocks, stone desert and very thick low deceleration zone. The overthrust nappes underground also add complexity to seismic exploration. Several seismic explorations have been carried out before, but the structural imaging problem remains unsolved. Forward modeling method in ray tracing theory is used in this 2D seismic exploration to study the impacts of various parameters on structural imaging and the shooting parameters are optimized in combination with the quantitative a-nalysis of experiment results. Processing of the acquired seismic data gives out a clear image of the thrust nappes with distinct thrusting break points and fractured surface.
出处
《河南石油》
2005年第3期14-16,i001-i002,共5页
Henan Petroleum
关键词
逆冲
推覆带
正演模拟
射线追踪
采集参数
overthrust nappe zone, forward modeling, ray tracing, acquisition parameter
