【摘要】 针对常规三维地震对小断层、陷落柱解释精度较低的现状,提出了三维数据体方差体计算方法,以克服常规解释方法存在的问题。方差体技术的核心,就是求取整个三维地震数据体中所有样点的方差值。方差值参数的选取原则:一是要根据预测的断层走向选择加法模式或乘法模式;二是要根据所预测断层的大小来确定参与运算的道数;三是根据地层倾角的大小选择计算时窗。依据其计算方法及参数选取原则编制了三维地震方差体微机计算软件,利用该软件对山东某区三维地震资料进行了解释。实例表明经方差体计算的水平切片可以很清楚的看断层的错断、同相轴的扭曲及断层的延展方向,经方差体计算的顺层切片对断层的空间展布、走向及相互间切割关系也一目了然,特别是在常规解释结果中却没有明显的反映的较小断层,在顺层切片中清晰可见,由此看见方差体解释技术对断层细节的反映更为清晰。更多还原

【Abstract】 In view of the low accuracy status of conventional 3D-seismic minor fault,subsided column interpretation at present,the 3D data volume variance cube computation method put forward to get over problems in conventional interpretation.The kernel of variance cube technology is to get all variance yields of sampling sites in 3D seismic data volume.The selection principles of variance yield parameters have:1.to select additive model or multiplicative model based on predicted fault strike;2.to determine seismic trace number based on predicted fault scope;3.to select computation widow based on strata dip angle.3D seismic variance cube microcomputer computing software has been compiled according to computing method and parameter selection principles,and used to 3D seismic data interpretation in a Shandong project.The case made clear that on the variance cube computed horizontal sections,fault slip,twisting phase axis and fault extending orientation can be seen clearly;on the variance cube computed bedding slice,fault spatial extension,strike and mutual cutting also clear at a glance,especially smaller faults cannot be seen on conventional interpretation,but clear on bedding slices,thus variance cube interpretation technology can reflect fault details clearer.更多还原