三维观测系统属性定量评价方法探讨
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摘要
尝试从定量角度评价三维地震采集观测系统属性的优劣,尤其充分考虑纵横向属性的均匀性。创新提出了观测系统均匀因子、方位角新横纵比、有效覆盖次数等概念和表达关系式,并指出了其地球物理意义。将均匀因子、新横纵比、有效覆盖次数与最大炮检距一起根据其对观测系统属性的贡献度建立了综合表述观测系统属性的总体评价定量表达式,并给出了算例。算例结果表明,从均匀性、方位角、覆盖次数以及最大炮检距等方面总体定量评价的数学公式,在以后的三维观测系统设计中可以直接定量计算不同观测系统的属性及属性总体评价值,方法简单,快捷有效。
This paper tries to make a quantitative evaluation of the 3D seismic geometry attributes and particularly takes into account the vertical and horizontal uniformity. From an angle of creation, it comes up with the concepts of the geometry's uniform factors, new aspect ratio, effective folds and formula for expression of relations and points out the geophysical significance of these new concepts. The uniform factors, new aspect ratio and effective folds are used, together with the maximum offset, to establish an overall quantitative evaluation method of the geometry attributes on the basis of their contributions to the geometry, and offer a numerical example. The results of the numerical example indicate that the mathematical formula of the overall quantitative evaluation covering uniform factors, azimuth, amount of folds and maximum offset can be used to directly calculate the attributes of different geometries and the assessed values of the attributes in the future design of 3D geometry. This method is simple, fast and effective.
引文
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