【摘要】 通过对溶洞复合反射系数的系统研究 ,得出其地震响应具有振幅强、速度低和调谐性的特点 ,并对强反射形成的条件及不同充填物溶洞的反射特征进行探讨 ,认为在常规频率 (2 0～ 30Hz)的地震资料中可以观察到溶洞产生的强反射波。根据溶洞高度及填充物性质与信号频率之间的关系 ,研究开发了一种以波动方程为基础的频率差异分析预测技术。在塔河油田的应用表明 ,该技术可以从主频为 2 0～ 30Hz的常规地震资料中提取埋深 5 0 0 0m以上、宽度 10 0m以上、高度 3m以上的充填流体的溶洞的振幅 频率和速度 频率异常 ,异常表现出分区、分层和纵横向连通的特征。据此可预测溶洞的存在及其空间分布 ,并估算其高度。更多还原

【Abstract】 Systematic study of composite reflectance coefficient of solution cavity shows that the seismic response is characterized by strong amplitude, low velocity and harmonization. This paper discusses the conditions of occurrence of strong reflectance and the reflectance signatures of cavities with different filling materials, and believes that strong reflectance waves can be observed in seismic data with normal frequency (20～30?Hz). According to the relationship between height of cavity,property of filling material and signal frequency, a frequency difference prediction and analysis technology is developed on the basis of wave equation. Its application in Tahe oilfield shows that this technology can get amplitude-frequency and velocity-frequency anomalies in cavities filled with fluid at a burial depth of over 5?000?m, with over 100?m width and over 3?m height from normal seismic data with predominant frequency of 20～ 30?Hz. The anomalies appear in different zones and different layers with vertical and lateral comunications. They can be used as the basis for determining the existence of cavities, their distribution and estimating their heights.更多还原