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本文所提出的连续速度分析技术是以前速度分析方法的发展,也就是用计算机从地震反射资料中提取速度信息的方法的发展。用多次覆盖资料的每一道,根据时差扫描和倾角扫描方法,测定地震记录上的每个规則同相轴的时间、振幅、时差和倾角。利用这四个參数沿着测线追踪反射波的同相轴。最后,将剖面上每个深度点的每一个反射同相轴的时间、振幅和时差存入计算机的存储器中。当计算机选取的同相轴接近于一般的剖面上可见的明显程度时,由时差扫描和倾角扫描增加的信噪比大于一般剖面上达到的信噪比。可以用不同的方法显示以取得速度信息,用于确定速度函数以进行时差校正、时间偏移校正和深度变换等资料处理,也能被解释人员用于确定层速度和估算砂页岩比值。
The continuous velocity analysis technique proposed in this paper is the development of the previous velocity analysis method, that is, the development of a computer-based method of extracting velocity information from seismic reflection data. The time, amplitude, time difference, and dip of each regular event on the seismic record are measured using time-of-flight and dip-scan methods with multiple passes of the data. Use these four parameters to track the events along the line of reflection. Finally, the time, amplitude and time difference of each reflection event at each depth point in the profile are stored in the computer’s memory. When computer-selected events are close to the apparent extent visible on a typical profile, the signal-to-noise ratio increased by the time-of-flight and dip sweeps is greater than the signal-to-noise ratio achieved on a typical profile. It can be displayed in different ways to obtain velocity information, which can be used to determine the velocity function for data processing such as time difference correction, time offset correction, and depth transformation, and can also be used by interpreters to determine layer velocities and estimate sand shale ratios.