层状介质等效孔隙流体模量与孔弹性刚性常量及尺度效应关系研究

基于孔弹性理论的定量地震解释技术在油气勘探实践中得到广泛应用，然而储层弹性性质对地震波长尺度下的等效孔弹性参数的作用尚未明确，使得地震储层预测结果产生多解性。前期研究发现储层流体性质对等效孔弹性刚性常量的作用将受到尺度效应、各向异性及衰减的共同影响。为此，课题组拟开展层状介质等效孔弹性理论模型与实验研究，构建层状介质等效孔弹性理论模型，研究地震尺度下等效流体模量与孔弹性刚性常量的关系，分析等效孔弹性模量频散与动态流体模量的变化规律，探索储层的弹性模量-孔隙流体模量关系与地震尺度下相应的等效孔弹性模量之间关系的差异和内在联系。研究工作将在层状介质等效各向异性孔弹性理论模型的建立、不同分析尺度的等效流体模量与孔弹性刚性常量之间关系的变化特征、以及层状介质的等效流体模量理论计算和分析方法等方面取得创新成果。研究工作对地震资料解释的理论发展非常必要，为地震定量预测技术创新研究提供必要的理论基础。

The rock physics-based seismic quantitative interpretation technology has been widely applied in oil and gas industries. However, the mechanism of the effect of reservoir elastic properties on the effective poroelastic parameters at seismic-scales is not clear, resulting in the existence of ambiguities in the seismic predicted results. Our previous study found that the effect of pore fluid properties within a reservoirs on effective poroelastic moduli should be affected by scale-effect, anisotropy and attenuation. In this connection, our research team intend to investigate the effective poroelastic model for a layered porous media by theoretical and experiment studies, to deduce the effective poroelastic theoretical model for layered porous media and to build an analytical framework, to analyze the relationship between the effective pore fluid modulus and poroelastic constants at seismic scale, to quantitatively study the change of the effective pore fluid modulus with the dispersion of the poroelastic modulus, to explore the relationship between the rock physical model established at local scale and that deduced from seismic-scale poroelastic constants. Our search will achieve innovative results in the construction of the effective poroelastic theoretical model for layered porous media, the changing characteristics of the relationship between the poroelastic constants and the pore fluid modulus at different analysis scales, and the theoretical calculation and analysis methods of the effective pore fluid modulus for a layered medium at seismic scale. This research is essential to theoretically develop a new seismic interpretation technique, and provide the theoretical fundament for the innovation of seismic quantitative interpretations.