【摘要】 现今广泛应用的纵波方位各向异性裂缝预测技术存在明显缺陷,即在对含有方位角信息的多个叠加数据体进行叠后偏移时,往往使用同一偏移速度,这种未顾及速度方位各向异性的做法会导致预测结果的不准确。本文采用在方位角道集上进行速度分析、在偏移过程中保留地震资料的速度方位各向异性信息的改进措施,提高了裂缝预测的精度。对实际工区叠前地震资料分别采用常规法和改进法进行裂缝预测,并与地层微电阻率成像测井得到的裂缝信息对比,展现了本文改进方法的优越性。更多还原

【Abstract】 P-wave anisotropy is widely used for fractures prediction.However conventional methods have a defect,as only one migration velocity is used during the poststack migration for different azimuth data.So the prediction results may be inaccurate.To solve this problem,we propose an improved method.First velocity analysis is taken on different azimuthal gathers,and then velocity anisotropy is saved.So fracture prediction precision would be improved.Both conventional method and the improve approach are used on real prestack data for fractures prediction.Their results are compared with fractures obtained from well logging data.These examples show the validity of the improved method.更多还原