复杂地表区三维地震资料成图方法研究与应用效果分析

Study of 3-D seismic data mapping method in complicated surface condition area and its application result

河南油田地调处物研所,南阳473132

Research Institute, Geological Division, Henan Petroleum Administration, Nanyang 473132

文中从原理上分析了复杂地表对地下目的层反射准确成像造成的影响, 进而提出了消除这些影响的三维空校方法。针对不同基准面的三维数据体, 从方法原理上提出了不同的解决办法。本方法用于新疆某盆地, 较好地解释了以前不能解释的地质现象, 发现以前的构造图在横向上有几十米, 甚至有上百米的误差。因此, 在复杂地表区地震勘探中应用此项技术, 能更好地落实构造, 提高勘探开发精度。该方法也适合二维地震勘探。

The effect of complicated surface terrain on accurate imaging of subsurface targetlayers is analyzed in this paper, and then 3-D spatial correction method is proposed to remove theeffect. Different solutions are given for 3-D data volume with different datum. By applying it to abasin in the Xinjiang region, the geologic phenomenon which can not be interpreted previously iswell interpreted. It is found that the previously generated structural map has an error of a fewdecade meters in the lateral position. Hence, this method is of assistance in defining structuresmore precisely and improving the precision of exploration and development. It is adaptive to both3-D and 2-D seismic prospecting.