岩性油气藏 ›› 2015, Vol. 27 ›› Issue (3): 122126.doi: 10.3969/j.issn.1673-8926.2015.03.019
边立恩,于 茜,谷志猛,韩自军,屈 勇
BIAN Li’en, YU Qian, GU Zhimeng, HAN Zijun, QU Yong
摘要:
时深转换作为联系地震与地质的桥梁,是地球物理研究的一大热点。 随着渤海油田勘探开发程度的不断加深,对时深转换的要求逐渐提高。 渤海 Q 油田目的层为明下段曲流河沉积,具有典型的低幅度构造特征,且地层速度横向变化较大,具有明显的低速异常特征。这两方面特征增加了该油田时深转换研究的难度。 针对常规速度建模方法的缺陷和不足,提出了种子点约束空间插值的平均速度场建模方法。 该方法首先根据地震资料并结合测井及地质分层,来确定低速异常带的分布;然后根据速度异常量的大小,在低速异常带范围内设置种子点并结合井点处的速度,进行空间约束插值,进而建立速度场并用于时深转换。从实际钻井情况来看,该方法预测精度较常规方法有了较大提高,并取得了良好的实际应用效果。
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