摘要
三维速度场在石油勘探中有着重要的作用,通过对春光区块速度资料收集与整理,结合该区块地层倾角比较平缓的地质特征,根据DIX公式直接将叠加速度转换为平均速度,对空间各数据点处平均速度进行空间网格平滑处理,建立了该区块三维空间速度场。在对速度场校正过程中,由于区块地震合成记录资料与速度谱对比差异较小,加上本区块VSP资料较少,因此选择用地震合成记录对速度场进行校正,经多次校正提高了速度场的精度。这为后续变速成图提供了准确的速度模型,进而提高构造圈闭的落实精度。
The technology of 3D velocity field plays an important role in oil and gas exploration. And it has been applied to Chunguang block. At first, the velocity data of the block were collected and reorganized; and then, stacking velocity was directly transformed into average velocity by means of DIX formula; thirdly,smoothing treatment of spatial grids was implemented for the average velocity of every data spot; finally, the 3D velocity field was established. In addition, a synthetic seismogram was selected for velocity-field calibration because of not only a little difference between synthetic seismogram and velocity spectrum but also very little VSP data. After many-time calibration, the velocity-field precision was improved, which might provide an accurate velocity model for subsequent variable-velocity mapping and further increase the precision to recognize structural trap.
出处
《天然气技术与经济》
2014年第4期17-20,77-78,共4页
Natural Gas Technology and Economy
关键词
春光区块
速度场
叠加速度
速度模型
Chunguang block,velocity field,stacking velocity,velocity model
