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为使从地震数据中所提取的属性参数具有一定的地质意义,需要建立岩石物理性质与储层岩石沉积学特征之间的定性或定量关系。利用储层砂岩样品试验测试结果并根据胶结砂岩模型等有效介质理论分析了成岩作用及岩石结构变化对地震弹性属性的影响及其在弹性属性(速度、模量)-孔隙度交会图中的表现形式。成岩作用(胶结物含量)控制了砂岩弹性属性在交会图中的相对位置。结构变化对弹性属性的影响弱于成岩作用的影响,在弹性属性-孔隙度交会图中因结构变化而表现出的整体变化趋势斜率小于成岩作用差异所表现出的趋势,为利用地震弹性属性解释岩石沉积特征提供了一种方法。利用等效弹性模量理论分别给出了定量模拟流体饱和储层砂岩成岩作用变化(胶结物含量差异)、结构变化(定胶结物含量)对弹性波速度及模量影响的理论计算方法。
In order to make the attribute parameters extracted from the seismic data have certain geological significance, it is necessary to establish the qualitative or quantitative relationship between the petrophysical properties and the petrographic sedimentary characteristics of the reservoir. Based on the test results of reservoir sandstone samples and the effect of diagenesis and rock structure on the elastic properties of earthquakes and their performance in elastic properties (velocity, modulus) and porosity cross-plot based on the effective medium theory of cemented sandstone model form. Diagenesis (cement content) controls the relative position of sandstone elastic properties in the cross-plot. The effect of structural change on elastic properties is weaker than the effect of diagenesis. The slope of the overall change trend due to structural changes in the elastic property-porosity cross-plot is smaller than the trend shown by the diagenetic difference. In order to explain the use of seismic elastic properties Rock depositional features provide a method. Based on the equivalent elastic modulus theory, the theoretical calculation method of quantitatively simulating the influence of diagenesis (difference of cement content) and structural change (fixed cement content) on elastic wave velocity and modulus of sandstone in saturated fluid reservoir is given.