虚拟井技术在深水无井区碎屑岩储层预测中的应用

以某海域深水无井区的中央水道砂岩储层为研究对象,采用叠前和叠后混合反演技术解决无井约束下的地震反演问题。利用遗传算法,在一些控制点进行精细的叠前地震波形反演并构建虚拟井曲线,以虚拟井曲线作为控制信息进行叠后反演,达到预测储层的目的。结合叠前弹性参数(泊松比)反演和油气敏感地震属性分析综合预测有利储层的分布特征。实际应用结果表明,虚拟井技术在海相油气勘探初期和深海无井勘探区储层预测中是可行的,可以极大地降低勘探风险。

Application of pseudo-well technology for clastic rock reservoir prediction in deep-sea no-well area

By applying pre-stack and post-stack involved inversion technique, no-well constrained seismic inversion problem of the central channel sand reservoir in a deep-sea no-well area was resolved.The technique uses genetic algorithm to build a pseudo-well log at some controlling points by detailed pre-stack seismic inversion.Then the pseudo-well is taken as constrained information to carry out post-stack inversion and reservoir prediction.By the analysis on prestack elastic parameters(Poisson’s ratio) and seismic attributes sensitive to oil and gas,the distribution of reservoir was predicted. Actual results show that pseudo-well technology is feasible for marine preliminary exploration and reservoir prediction of deep-sea nowell exploration area,and can largely reduce the risk of exploration.