储气层之震波异常与速度剖面分析研究

储气层之震波异常一般为平点、亮点、、强反射强度、低频、时间延迟、极性倒转及低速。最普遍的震波异常为高点，但最可靠的却是平点．因为地层中的流体界面往往是水平的。在震波异常与速度剖面分析之前．应将反射信号之极性调整到与地层中反射系数之物理意义相一致。由震测反射振幅．推算震波速度．必须靠井下电测资料、震波速度分析和区域地质条件以补足低频速度．并加以校正以代表地层速度变化．从而分析地层储聚油气之速度差异。研究实例中．均成功地发现油气。显示震波异常与速度剖面分析，的确可以提高石油探勘的信赖度。

Analyses of Seismic Wave Anomaly and Velocity Profile in Gas-Bearing Reservoir

Anomalous seismic wave in gas-bearing, reservoir is typicallycharacterized by flat spot, bright spot, strong reflection, low frequency, time dely, polarity inversion and low velocity. The most universal characteristic of seismic wave anomaly is bright spot. but the most reliable wave is at flat spot. Because the fluid interface is often horizontal in formation. Before analyzing seismic wave anomaly and velocity profiles. the polarity of reflected signal should be adjusted to be same as the physical significance of reflection coefficient. calculating selsmic wave velocity by reflected wave amplitude must depend on electric logging information. analysis of wave velocity and regional geologic conditions to complement and rectify low frequency velocity. so as to show the velocity change in formation thus analyzing velocity difference of oil and gas accurnulation in fomation. Oil and gas was found successfully in instance study. Seismic wave anomaly and analysis of velocity profile can improve reliability of petroleum exploration.