层控垂向多参数拟合变速成图方法研究——以明水绥化地区为例

Methodology of variable velocity mapping using vertical multi-parameters fitting controled by horizons——a case study of Mingshui-Suihua

明水绥化地区构造复杂,隆凹相间的构造格局使得地震速度横向变化较大.使用常规方法进行时深转换绘制的大面积连片构造图误差较大,不能够满足生产的需要.为了适应勘探提出了一种新的方法:层控垂向多参数拟合,分段建立时深关系:通过选择地震参考层,将地震反射层与钻井资料相结合,利用伪速度及各反射层特征分别建立深浅层三维空间地震速度场,确定速度横向变化规律,最终实现研究区的变速成图,误差分析表明大面积连片构造图的精度有很大的提高.

The structure of Mingshui-suihua area is complex, structural feature of uplift and depression makes the lateral velocity varies greatly. When conventional methods of depth conversion drawn large area structure plans big error, not able to meet production needs. To solve the issue of exploration, the paper proposed a new approach： vertical multbparameters fitting controled by horizons, establish relations between time and depth in segment. By establishing the seismic reference layer and plane combination of seismic and geological data, the distribution of the three-dimensional space velocity field in the deep and shallow layer is established with the aid of pseudo velocity and the characteristic of seismic reflection horizon, at last the rule of the lateral distribution is obtained, and ultimately in the study area of the variable velocity mapping, error analysis shows that large contiguous structural map of the accuracy greatly improved.