地震相干分析技术在裂缝油气藏预测中的应用
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摘要
地震相干分析技术侧重于地震反射波形，目的是确定地下储层的横向岩性变化，其假设条件是地层连续、横向上地质与地球物理参数变化不大、道与道之间的波形应相似。当存在断层或裂缝发育时，地震剖面上波形特征会发生变化；用多道相似性准则去衡量它，找出波形特征的变化与相似系数的关系，根据已知区相似系数的变化规律，可预测新探区是否有断层或裂缝分布。模型结果表明，相干分析技术对断层（或岩性变化带）、裂缝等因素所引起的地震道间的变化反应敏感，可用于断裂系统及储层裂缝发育带的预测。该技术在ＬＸ、ＣＤ等地区应用效果较好。
Giving emphasis to seismic reflection waveforms, seismic coherent analysis technology aimed at making a determination of lateral lithologic variation for subsurface reservoir. Its synthetic condition is that waveforms between traces must be similar when event is continuity and lateral geologic and geophysical parameters have not significant changes. The waveform character on seismic section will be changed when faults and cracks well developed ; measured it with multi-channel coherent rule,found relations between variation in waveform character and similar coefficient,it can predict if there are distributions of faults or fractures in a new survey zone according to changing rule of similar coefficient in a known area. Modeling results show that the method can sensitively reflect the changes between traces caused by factors of faults (or variant lithologic zone ),cracks etc and can be used to predict fault system and fracture development zone of reservoir. Practical application of it in LX and CD regions shows good results.
Giving emphasis to seismic reflection waveforms, seismic coherent analysis technology aimed at making a determination of lateral lithologic variation for subsurface reservoir. Its synthetic condition is that waveforms between traces must be similar when event is continuity and lateral geologic and geophysical parameters have not significant changes. The waveform character on seismic section will be changed when faults and cracks well developed ; measured it with multi-channel coherent rule,found relations between variation in waveform character and similar coefficient,it can predict if there are distributions of faults or fractures in a new survey zone according to changing rule of similar coefficient in a known area. Modeling results show that the method can sensitively reflect the changes between traces caused by factors of faults (or variant lithologic zone ),cracks etc and can be used to predict fault system and fracture development zone of reservoir. Practical application of it in LX and CD regions shows good results.
引文
l Mike Bahorich,Steve Farmer. 3-D seismic discontinuity for faults and stratigraphic features-the coherence cube. The Leading Edge, 1995, 14 (10)
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