火焰山逆掩带成图方法探讨

DISCUSSION OF IMAGING METHOD OF HUOYANSHAN OVERTHRUST BELT

火焰山构造带作为吐哈盆地近期勘探的主要区带,由于火焰山带地表条件恶劣、地震资料品质较差,且火焰山逆冲断层上盘山体的速度大、变化快,在时间剖面上造成下盘的假构造、假断层和构造高点偏移的现象,长期制约着该区的勘探进程。本文根据火焰山掩伏带的特点,针对性的开展变速成图方法攻关,利用地震正演模型分析的方法,分析和计算下盘构造是否落实和构造高点的偏移情况,寻找到一条适合火焰山下盘变速成图的方法,准确的落实了胜金口下盘的火焰山背斜构造圈闭,并通过火3井的钻探证实了背斜圈闭落实可靠。因此,该成图方法为揭开火焰山掩覆带构造内幕提供了一种相对有效的方法。

The false structures,false faults and structural high offsets in the lower wall on the time section caused by hos- tile surface condition,poor seismic data and the high velocity and quick variation of the upper wall of the overthrust fault restricted the exploration course of Huoyanshan area,which is the main exploration zone of Tuha basin in the near future.It has been carried out to tackle the key problem of imaging method on the basis of characteristics of the Huoyanshan overthrust belt.The seismic forward model analysis is used to analyze and calculate lower wall structure and the offset of the structure high and look for a proper variable speed imaging method for Huoyanshan lower wall.The Huoyanshan anticline trap in the Shengjinkou lower wall was ascertained,which was proved by the drilling of Well Huo3.Thus,This imaging method is a effective way to reveal the inside story of the Huoyanshan o- verthrust structure belt.