The conventional stress field calculation method based on 2D surface curvature is limited by the interpretation accuracy of target layer.To overcome this defect,this paper proposed a 3D stress field analysis method based on dip attributes,in which the "curvature-strain-stress" equation is transformed into a "dip-strain-stress" equation.This method can calculate the field stress through the strata dip.Firstly,this method applies the dip scan method with eccentric window to calculate the dip angle of the 3D seismic data body;then calculate the volumetric curvature of the target formation based on the dip attributes,and finally calculate the 3D stress field of the target formation with the "dip-strain-stress" equation.This method applies the concept of 3D volumetric curvature analysis and directly calculates the 3D seismic data body,thus effectively overcoming the defects of conventional method limited by the formation interpretation accuracy.The calculation results of granite reservoirs in some work area of Bohai sea show that the prediction results of this method are in good conformity with well log interpretation and can be effectively applied to the prediction of fractures in the study area,which has some promotion significance.%常规基于二维面凸率的应力场计算方法会受到目的层层位解释精度的影响,为了克服这一缺陷,提出了一种基于倾角属性的三维地应力场分析方法,将“曲率-应变-应力”方程变形为“倾角-应变-应力”方程,实现了通过地层倾角计算地应力.该方法首先采用离心窗倾角扫描方法计算三维地震数据体的倾角,再基于倾角属性计算目的层段的体曲率,最后采用“曲率-应变-应力”方程计算目的层段的三维地应力场.该方法借用了三维体曲率分析的思路,直接针对三维地震数据体进行计算,有效克服了常规方法受层位解释精度影响的缺陷.渤海某工区花岗岩储层实际资料的计算结果表明,本文方法的预测结果与测井解释的一致性较好,可以有效地应用于研究区的裂缝预测,具有一定的推广意义.
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