塔里木盆地沙漠区高分辨率地震采集方法探讨

本文根据塔里木盆地勘探现状,结合以往所做的一些试验,提出了塔里木盆地大沙漠区进行高分辨率勘探的新技术、新方法及其在实际中的应用效果。提高仪器前置滤波的低截频率,可相对抬升高频,有效地改善记录上的高频成分;选择有利于提升高频信号的检波器,是切实可行的方法;检波器的埋置条件和效果及串联组合方式也是提高分辨率的有效途径;灵活运用可控震源的扫描方式补偿高频能量,如非线性扫描、变频扫描等;通过选择炸药类型和药量可以有效提高分辨率。综合应用以上各项技术措施,使大沙漠区的地震剖面分辨率得以大大提高。

A Discuss on High Resolution Seismic Acquisition Methods in Desert Area in the Tarim Basin

According to the current status of the Tarim Basin and combining with some previous tests, this paper proposed the new technology and new method for the high resolution exploration in the desert area of the Tarim Basin. Increasing the low-cut frequency of pre-filtering of the instrument can rise the high frequency relatively and improve the high frequency record effectively. It is feasible to select the appropriate geophone which is favorable for improving the quality of high frequency signals. Improving the burying condition and effect of geophone and arranging pattern is also an effective way to improve resolution. The scanning methods of the controllable seismic source such as nonlinear scanning and variable-frequency scanning can compensate high-frequency energy. Selecting type and volume of explosive can improve resolution effectively. The resolution of seismic profile of the desert area can be improved greatly by applying the above-mentioned methods comprehensively.