【摘要】 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。更多还原

【Abstract】 The change in the nature of the fluids in fracture systems can cause the variation of the features of seismic waves inevitably and the influence of the gas contained in the fracture systems on the compressional and shear waves is different from that of the water. For example,when the gas is contained in the fracture systems,the compressional wave velocity decreases obviously but the shear wave velocity does not vary or has a slight reduction;and the ratio between compressional and shear wave velocities and the poissons ratio are obviously reduced By use of the multicomponent seismic data acquired from Lingyinsi region in Sichuan,the compressional wave and converted wave sections were abtained through processing and the compressional and shear wave velocities were achieved by the aid of inversion; Through contrasting directly the compressional wave sections with the shear wave ones,the gas distribution areas within the scope controlled by the seismic lines in the experimental region were predicted on the basis of comprehensively contrasting and interpreting the trace integration and velocity sections The results predicted are well identical with those drilled,therefore it is an effective method to detect directly the oil and gas underground by applying the multicomponent seismic data更多还原