【摘要】 为研究孔洞型碳酸盐岩储层的地震响应特征,利用基于地质模型的超声波实验观测方法,在孔洞系统中建立了单、多孔物理模型,通过大量的超声波透射实验,观测了不同孔洞模型的超声波响应特征,分析了探头频率、孔密度和孔排列方式对地震波属性参数的影响。结果表明:①探头频率与孔洞模型地震波的各项属性参数之间存在着一定的相关性;②孔密度对模型的地震波部分特征参数有明显影响,振幅和品质因子的衰减比速度对岩石孔密度变化更为敏感;③孔的排列方式对模型的地震波基本特征参数影响不明显,但在相同孔密度的条件下,轴向排列的孔状态明显小于其他径向孔状态的速度。该研究成果为地震资料解释及储层评价提供了依据。更多还原

【Abstract】 In order to study the seismic response characteristics of vuggy carbonate reservoirs, single-pore and multi-pore models are built for the pore cavern system by use of geologic model-based experimental observation methods of ultrasonic waves. Not only are the ultrasonic response characteristics observed of different pore/cavern models through a large number of transmission experiments by ultra-sonic wave, but the impacts of probe frequency, pore density and arrangement are analyzed on seismic attributes. The following conclusions were obtained. (1) There are certain correlations between probe frequency and seismic attributes of pore/cavern models. (2) Pore density has significant impacts on some characteristic parameters of seismic waves. In comparison with velocity,the attenuation of amplitude and quality factor is more sensitive to the variation of pore density. (3) Impacts of pore arrangement on the basic characteristic parameters of seismic waves are insignificant. However, when pore density is the same, the velocity of model with pores in axial array is significantly slower than that with pores in radial array. These understandings provide a basis for seismic interpretation and reservoir appraisal.更多还原