AVO forward modeling is based on two-phase medium theory and is considered an effective method for describing reservoir rocks and fluids. However, the method depends on the input matrix mineral bulk modulus and the ra...AVO forward modeling is based on two-phase medium theory and is considered an effective method for describing reservoir rocks and fluids. However, the method depends on the input matrix mineral bulk modulus and the rationality of the two-phase medium model. We used the matrix mineral bulk modulus inversion method and multiple constraints to obtain a two-phase medium model with physical meaning. The proposed method guarantees the reliability of the obtained AVO characteristicsin two-phase media. By the comparative analysis of different lithology of the core sample, the advantages and accuracy of the inversion method can be illustrated. Also, the inversion method can be applied in LH area, and the AVO characteristics can be obtained when the porosity, fluid saturation, and other important lithology parameters are changed. In particular, the reflection coefficient amplitude difference between the fast P wave and S wave as a function of porosity at the same incidence angle, and the difference in the incidence angle threshold can be used to decipher porosity.展开更多
AVO(Amplitude Versus Offset)效应反映了地震反射振幅随炮检距的变化,利用AVO效应可以预测储层参数并识别油气异常.当地层中含有油气时,泊松比参数发生明显变化,产生AVO异常.通过正演AVO模拟,分析了不同泊松比和储层厚度组合下,AVO效...AVO(Amplitude Versus Offset)效应反映了地震反射振幅随炮检距的变化,利用AVO效应可以预测储层参数并识别油气异常.当地层中含有油气时,泊松比参数发生明显变化,产生AVO异常.通过正演AVO模拟,分析了不同泊松比和储层厚度组合下,AVO效应特征参数(AVO截距和梯度)之间的关系,提出了泊松比参数反演方法,得出了反演经验公式.通过对理论模型反演及实际地震资料试算表明,反演结果与实际值接近,应用该方法可预测目的层的泊松比及含气性.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.41404101,41174114,41274130,and 41404102)
文摘AVO forward modeling is based on two-phase medium theory and is considered an effective method for describing reservoir rocks and fluids. However, the method depends on the input matrix mineral bulk modulus and the rationality of the two-phase medium model. We used the matrix mineral bulk modulus inversion method and multiple constraints to obtain a two-phase medium model with physical meaning. The proposed method guarantees the reliability of the obtained AVO characteristicsin two-phase media. By the comparative analysis of different lithology of the core sample, the advantages and accuracy of the inversion method can be illustrated. Also, the inversion method can be applied in LH area, and the AVO characteristics can be obtained when the porosity, fluid saturation, and other important lithology parameters are changed. In particular, the reflection coefficient amplitude difference between the fast P wave and S wave as a function of porosity at the same incidence angle, and the difference in the incidence angle threshold can be used to decipher porosity.
文摘AVO(Amplitude Versus Offset)效应反映了地震反射振幅随炮检距的变化,利用AVO效应可以预测储层参数并识别油气异常.当地层中含有油气时,泊松比参数发生明显变化,产生AVO异常.通过正演AVO模拟,分析了不同泊松比和储层厚度组合下,AVO效应特征参数(AVO截距和梯度)之间的关系,提出了泊松比参数反演方法,得出了反演经验公式.通过对理论模型反演及实际地震资料试算表明,反演结果与实际值接近,应用该方法可预测目的层的泊松比及含气性.
