拟声波构建技术在砂泥岩薄互层储层预测中的应用

Application of quasi-acoustic constructing technique to reservoir prediction of thin interbed

1. 中国地质大学(北京)能源学院，北京100083; 2. 美国EPT公司，北京100085

China university of geosciences Beijing

拟声波构建技术依据对储层敏感的非声波地球物理测井信息构建具有声波量纲的新曲线,进而形成拟声波曲线。由于该声波曲线既能反映地层速度和波阻抗的变化,又能反映地层岩性的细微差别,可以较好地解决薄互层储层定量预测中的岩性识别、薄层分辨等难题。针对歧口凹陷南大港地区地层实测声波时差曲线对砂、泥岩的岩性反映不明显,无法进行储层反演预测的问题,采用了拟声波构建技术。将对储层岩性敏感性好的自然电位曲线转换成拟声波曲线,以此为约束条件实现了储层预测的目的,取得了较好的应用效果。

Seismic inversion is one of themost important core techniques in quantitative prediction of thin interbed reservoir. The information of both acoustic log and other log, which is sensitive to lithology, is used to construct quasi-acoustic logs. The quasi-acoustic logs can not only reflect the variation of interval velocity and impedance, but can resolve some problems like identifying lithologic character, differentiating thin layers, etc. The difference between sandstone velocity andmudstone velocity is in Qikou sag is too weak to be used to predict reservoir, therefore, the quasi-acoustic log of SP log, which is in accordance with lithology, are used in inversion, i-deal effects have been obtained in identifying the distribution and the thickness of reservoir.