准噶尔盆地南缘玛纳斯背斜速度成图方法研究

STUDY ON THE VARYING VELOCITY MAPPING METHOD IN THE MANASI ANTICLINE OF SOUTH JUNGGAR BASIN

随着地质勘探的不断深入,对构造图的精度要求也越来越高,因此,对速度场建立和变速构造成图方法也提出了更高的要求。在复杂构造地区,特别是逆冲断裂带较为发育的山前高陡构造区,常规的速度分析和常速成图方法得到的构造图精度低,已不能满足实际生产的需要。本文对二维地震山前高陡构造速度场建立与变速构造成图方法进行了深入研究,提出采用上、下盘分别建立速度场,利用钻测井资料分析区域速度变化规律约束层速度,总结出了适合于复杂构造区的速度场建立与变速成图方法。通过在准噶尔盆地南缘的实际应用,有效地提高了复杂地区速度场和构造图的精度,具有良好的推广应用前景。

In the complex structure area,especially the high steep structural region where the thrust belt is well developed,the structural map which is based on the conventional velocity analyzing and conventional mapping is not so precious and can't meet the production requirements.The paper has made an intensive study on building velocityfield model in the submountain high steep structural region and structure mapping.Based on the former sucessful experience,it builds velocity fields in upper wall and foot wall respectively and restricts the internal velocity with the changeing law of drilling velocity.A velocity-field model building and mapping method for the complex structure areas is summed up.The practical applications in south margin of Junggar Basin show that this method can improve the precision of building velocity field and structure mapping in compex structure areas,and has a good application prospect.