伪波阻抗反演和频谱成像技术在琼东南盆地储层预测中的应用

我国琼东南盆地深水区勘探程度低,工区内只有一口刚打到研究层段黄流组顶部的探井,针对该情况,介绍了一种在无井或少井情况下利用速度谱资料进行地震反演的方法.该方法首先利用离工区较近的井进行有井反演,然后结合有井反演过程的认识,利用速度谱资料提取伪井信息进行伪波阻抗反演,并充分利用已有的地质信息来完善无井反演的结果,最后利用频谱成像技术对反演结果进行验证.结果表明,为了获取准确的伪波阻抗数据,需要准确的速度谱数据,且在构造比较平缓、能量集中、质量较好的道集提取伪井资料,并充分利用已知地震、地质信息和频谱成像分析结果,可以减小无井反演结果的多解性.

Application of Pseudo-wave impedance inversion and spectral imaging technique to reservoir prediction in the Qiongdongnan Basin

The deepwater area of the Qiongdongnan Basin of China is a new exploring area with sparse wells controlled, and there is only one well drilled to the target of the Huangliu horizon. According to this situation, a seismic inversion method with velocity spectrum data  is presented for target areas with sparse or no well controlled. In the methodology, well-constrainted inversion is done firstly with the well near the target areas. Then, combined with the result of the well-constrained inversion, we use the pseudo-acoustic curves which are extracted from velocity spectrum data to do the pseudo-acoustic inversion. And we use the geology information to improve the quality of the pseudo-acoustic inversion. In the end, spectrum imaging is used to test the preudo-inversion result. The result shows that in order to achieve accurate pseudo-acoustic data, precise velocity spectrum data is required. And it is necessary to extract pseudo-well data in the area of gentle structure, energy concentration and good quality. The ambiguity of the pseudo-inversion can be reduced by using the known seismic and geological information as much as possible.