叠前同时反演技术在珠江口盆地西部海域天然气水合物储层预测中的应用

珠江口盆地西部海域发育弱BSR或无BSR的天然气水合物储层,常规叠后反演所获得的参数单一,难以精确预测其天然气水合物分布特征。本文在地震道集优化处理、精细速度分析、岩石物理分析及低频模型精确建立的基础上,针对性地采用叠前同时反演技术,对珠江口盆地西部海域天然气水合物储层进行预测,并利用岩相流体概率分析技术对其进行综合识别,实现了对天然气水合物储层地精细刻画。反演预测结果表明,研究区天然气水合物较为发育,预测结果与钻探结果吻合程度较高,应用效果良好。

The application of pre-stack simultaneous inversion to gas hydrates reservoir prediction in the western Pearl River Mouth basin

Weak BSR or no BSR is developed in western Pearl River Mouth basin.The conventional post-stack inversion obtains only one parameter,and it is difficult to accurately predict the gas hydrates distribution characteristics.Based on seismic gather optimization,fine velocity analysis,petrophysical analysis and accurate establishment of low-frequency models,the authors used pre-stack simultaneous inversion technology to predict gas hydrate reservoirs in western Pearl River Mouth basin,adopted facies and fluid probabilities analysis technology to comprehensively identify the gas hydrate reservoirs in the study area,and achieved a fine characterization of the gas hydrates.The inversion prediction results show that the gas hydrates are developed well in the study area,and the prediction results are consistent with the drilling results,implying that the application effect of pre-stack simultaneous inversion technology is ideal.