二维随机介质模型正演指导复杂地层地震解释——以薄层砂泥岩交互地层为例

大港油田砂泥岩交互地层存在着非均质复杂地质形态，为保证其精细解释效果，根据随机过程理论，提出了选用二维指数型椭圆自相关函数为复杂非均质地质体进行简化建模的方法。正演算法使用交错网格有限差分法模拟弹性波在二维随机介质模型中的传播，激发方式使用自激自收模式。正演结果表明，随机介质模型模拟大港油田薄层砂岩互层地层具有合理性，交错网格有限差分算法对于该模型的正演数值模拟，算法合适。

Complicated Strata Seismic Interpretation under Guiding of Forward 2D Random Media Modeling -- An Example of Thin Alternating Sandstone-Mudstone Beds

The alternating sandstone-mudstone beds in the Dagang oilfield are under a complicated anisotropic geological condition. To ensure the refined interpretation effects, put forward a method to use 2D exponent form elliptical autocorrelation function to simplify the modeling of complicated anisotropic geologic body based on random process theory. The forward algorithm uses staggered-grid finite difference method to simulate the propagation of elastic waves in 2D random media model, and shot mode uses self-shooting and self-receiving. The forward modeling results have demonstrated that the modeling of thin alternating sandstonemudstone beds in Dagang oilfield through the using of random media model has its reasonableness, and the staggered-grid finite difference algorithm is appropriate to the model＇s forward numerical simulation.