定量表征压实、胶结作用的砂岩声速模型及应用方法研究

The influences of the compaction and cementation on the acoustic velocities are not characterized quantitatively in the conventional velocity models, such as Wyllie’s equation and Xu-White Model. Therefore, it is hard to use them to predict the acoustic velocities of sandstone with different compaction and cementation degrees. The engineering applications on the diagenetic facies recognition and shear wave velocity prediction are thus constrained. In this research, the compaction and cementation will be characterized by the apparent compaction rate and cementation rate respectively based on the extension of the Contact Cement Theory (CCT). The theoretical analysis and experimental calibration will be combined to build a model to characterize the influence of compaction and cementation. The potential engineering application will also be explored. The detailed content includes: 1) the investigation on the relation between the micro parameters and the macro parameters which characterize compaction and cementation; 2) building the acoustic velocity model to characterize the apparent compaction and cementation rate quantitatively; 3) the simplified model based on Tylor expansion or statistical approximation; 4)the method to inverse the apparent compaction rate and cementation rate from the acoustic velocities and the prediction of shear wave velocity. The key innovation is the build of an integrated velocity model based on CCT, which characterizes both the compaction and cementation quantitatively. The research will further develop the acoustic velocity theories for the sandstone. It will also improve the quantitative interpretation of diagenetic facies from seismic and logging data, the prediction of shear wave velocity and the calculation of porosity. Thus, it has significant theory innovation and engineering applications.

常用的Wyllie公式等砂岩声速模型未从力学上定量表征压实、胶结作用对岩石声速的影响，难以预测不同压实、胶结成岩相砂岩的声速，在成岩相研究、横波速度预测等工程应用方面存在缺陷。本研究拟基于CCT模型的扩展，引入定量表征压实、胶结作用的视压实率、视胶结率，采用理论分析与实验检验、刻度相结合的研究方法，建立定量表征压实、胶结作用的砂岩的声速模型并探索其工程应用方法。研究内容包括：1）压实与胶结作用的微观和宏观定量表征参数的关系考察；2）定量表征视压实率、视胶结率的声速模型；3）基于泰勒展开或统计近似的简化声速模型； 4）利用声速反演视压实率和视胶结率的方法及横波速度预测方法。研究的核心创新是基于扩展的接触胶结理论（CCT）的定量表征压实和胶结作用的砂岩声速模型。研究可完善砂岩声速理论，推动砂岩成岩相的地震和测井定量评价以及横波速度预测等方法的研究，具有重要的理论创新和实践应用价值。

常用的Wyllie公式等砂岩声速模型未从力学上定量表征压实、胶结作用对岩石声速的影响，难以预测不同压实、胶结成岩相砂岩的声速，在成岩相研究、横波速度预测等工程应用方面存在缺陷。本研究拟基于CCT模型的扩展，引入定量表征压实、胶结作用的视压实率、视胶结率，采用理论分析与实验检验、刻度相结合的研究方法，建立定量表征压实、胶结作用的砂岩声速模型并探索其工程应用方法。研究内容包括：1) 压实与胶结作用的微观和宏观定量表征参数的关系考察；2）定量表征视压实率、视胶结率的声速模型；3）基于泰勒展开或统计近似的简化胜诉模型；4）利用声速反演视压实率、视胶结率的方法及横波速度预测方法。研究的核心创新是基于扩展的接触胶结理论（CCT）的定量表征压实和胶结作用的砂岩声速模型。研究可完善砂岩声速理论，推动砂岩成岩相的地震和测井定量评价以及横波速度预测方法等方法的研究，具有重要的理论创新和实践应用价值。