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含油气储层都是由固体颗粒的骨架、孔隙及其充填流体所组成的多相介质,含油气储层的物性在油气勘探中所起的作用不容忽视。为了研究孔隙形状对AVO响应的影响,文中选取两层砂泥岩模型,按照不同孔隙形状来讨论砂岩的孔隙。首先利用Kuster-Toksoz公式求得岩石的等效模量,再利用Biot-Gassmann方程进行流体替换以求得饱含流体岩石的等效模量,最后利用Aki-Richards公式求取反射系数进行AVO正演模拟。结果显示孔隙形状对岩石的AVO响应有明显的影响,并且对饱含不同类型流体岩石的AVO响应的影响规律都是相似的。¨
The oil-bearing reservoirs are all multi-phase media composed of the skeleton of solid particles, pores and their filling fluids. The physical properties of oil-bearing reservoirs can not be ignored in oil and gas exploration. In order to study the effect of pore shape on AVO response, two layers of sandstone and mudstone models were selected to discuss the pores of sandstone according to different pore shapes. Firstly, the equivalent modulus of rock is obtained by Kuster-Toksoz formula, and the Biot-Gassmann equation is used to replace the fluid to obtain the equivalent modulus of fluid-saturated rock. Finally, the reflection coefficient is obtained by Aki-Richards formula and AVO forward simulation. The results show that the pore shape has obvious influence on the AVO response of rock, and the influence law of AVO response of rocks with different types of fluids is similar. ¨