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裂缝系统中流体性质的变化 ,必然引起地震波特征的变化 ;裂缝系统中含气或含水对纵横波的影响是不相同的 ,譬如 ,含气时纵波速度明显降低 ,而横波速度保持不变或略有降低 ,纵横波速度比和泊松比则明显降低。利用在四川灵音寺地区采集得到的多分量地震资料 ,处理得到纵波和转换波剖面 ,并反演出纵横波速度等信息 ;经过纵横波剖面的直接对比、以及对道积分、速度剖面的综合对比解释 ,预测出了该区试验测线范围内的含气分布 ,预测结果与实钻吻合较好。初步实践表明 ,利用多波资料直接检测油气是一种有效方法。
The change of fluid property in the fracture system inevitably leads to the change of the seismic wave characteristics. The influence of gas or water in the fracture system on the S-wave is different. For example, the P-wave velocity decreases obviously while the S-wave velocity stays the same or slightly Decreased, P-wave velocity ratio and Poisson’s ratio decreased obviously. Using the multi-component seismic data collected in Lingyinsi area of Sichuan Province, the longitudinal and converted wave profiles are processed and the P- and S-wave velocity information is inverted. After comparing the vertical and transverse wave profiles directly and comprehensively comparing the channel integration and velocity profile Explained and predicted the gas distribution within the test line range of the area, the prediction result is in good agreement with the real drilling. Preliminary practice shows that the use of multi-wave data to directly detect oil and gas is an effective method.