叠前时间偏移在采区三维地震老资料重新处理解释中的应用

摘要

受技术条件限制，以往采区地震资料多采用叠后时间偏移处理方法。实践证明该方法在地层倾角大、断层发育等地质条件复杂地区，很难准确成像。采用Kirchhoff叠前时间偏移的方法，合理配置参数，可以有效解决速度横向变化不大但倾角变化剧烈条件下三维地震成像精度低的问题。通过对淮北某矿区三维地震老资料应用叠前时间偏移处理结果表明：经过叠前时间偏移处理得到的数据体，其反射波特征明晰，经解释修正原断层7条、否定原断层2条、新发现断层4条，其中修正后的DF3断层已得到矿方的揭露验证，地震解释的断层性质、空间位置与实际揭露情况吻合良好。%Limited by technical conditions, previous winning district seismic data processing mostly uses poststack time migration. Prac-tices have shown that the method used in complicated geological condition areas with high strata dip angle, developed faults etc. can hardly to get accurate images. Using Kirchhoff prestack time migration with reasonable parameter configuration can effectively resolve low accuracy of 3D seismic imaging under not large transverse velocity changing but abrupt dip angle variation conditions. The prestack time migration processed result of old 3D seismic data from a Huaibei mine area has shown that the data volume after prestack time migration processing has shown clear reflection characteristics. After interpretation, corrected 7 original interpreted faults, 2 de-nied, 4 newly found, in which, the corrected DF3 has revealed and validated by the coalmine side. The seismic data interpreted fault characters and spatial location can commendably accord with practically revealed.