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薄层的常规地震响应近似为入射子波的时间微商,反之,伪阻抗响应近似为入射子波。因而,由薄层组成的地质序列的伪阻抗响应比常规地震响应较简单且易解释。通过用检验炮资料标定声测井资料并执行零相位地震处理,声测井和伪速度剖面的吻合可得到改善,但振幅和相位差异通常被保留。文中描述了一个五步处理和解释程序。用声测井产生的模拟地震剖面进行多道解释是该程序的优点。该方法用野外资料进行了检验,在检验中,用本程序进行薄层检测和油气含量评价比常规地震方法更为可靠。
The conventional seismic response of a thin layer approximates the time derivative of the incident wavelet, whereas the pseudo-impedance response approximates the incident wavelet. Thus, the pseudo-impedance response of geologic sequences composed of thin layers is simpler and easier to interpret than conventional seismic responses. By calibrating the acoustic logging data with test gun data and performing zero-phase seismic processing, the agreement between the acoustic logging and the pseudo-velocity profiles can be improved, but the amplitude and phase differences are usually preserved. The article describes a five-step processing and interpretation process. Multi-channel interpretation of the simulated seismic profiles generated by acoustic logging is an advantage of this procedure. The method was tested with field data. In the test, thin layer detection and hydrocarbon content evaluation by this program are more reliable than conventional seismic methods.