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从地震储层预测角度出发,以测井资料(常规测井资料和全波列测井资料)为主,结合地质、地震资料,总结了海上部分盆地下第三系(埋深从1300-5000 m)地层的地震岩石物理参数特征。通过分析不同岩性的声波时差、密度、纵波阻抗随不同深度自上而下的变化特征,认识到砂岩和泥岩的纵波阻抗在深度上有从浅至深分别为砂岩相对低纵波阻抗段(即小于泥岩纵波阻抗)、砂岩和泥岩纵波阻抗大小相当段和砂岩相对高纵波阻抗(大于泥岩纵波阻抗)段的3个分段。分析了3个不同的声波速度深度带的岩性、孔隙度与纵波阻抗、泊松比等地震岩石物理参数之间的关系;总结了区域性目的层地震岩石物理参数规律,指出海上下第三系地层应用常规纵波阻抗技术进行储层预测的难点和弹性波泊松比反演的优势,这些规律为指导地震储层预测技术的合理应用具有重要意义。
From the point of view of seismic reservoir prediction, logging data (conventional well logging data and full-wave well logging data) are mainly used in this paper. Based on the geological and seismic data, m) Seismic petrophysical parameters of the formation. By analyzing the characteristics of topographic variation of acoustic wave time lag, density and P-wave impedance with different depths from different lithologies, it is recognized that the P-wave impedance of sandstone and mudstone varies from shallow to deep in depth, Less than the longitudinal wave impedance of mudstone), the equivalent length of longitudinal wave impedance of sandstone and mudstone, and the three segments of relatively high longitudinal wave impedance (greater than the longitudinal wave impedance of mudstone) of sandstone. The relationship between lithology, porosity and P-wave physical parameters such as P-wave impedance, Poisson’s ratio and so on is analyzed. The laws of petrophysical parameters of regional target strata are summarized, The difficulties of reservoir prediction by conventional P-wave impedance technology and the advantage of elastic-wave Poisson’s ratio inversion in the strata are of great significance to guide the rational application of seismic reservoir prediction technology.