基于叠前AVA同步反演和地质统计学反演的高分辨率流体预测方法

针对薄层流体的精细预测问题，提出一种高分辨率流体预测方法。该方法在进行叠前AVA同步反演的基础上，同时对含水饱和度进行带岩性遮挡的地质统计学反演，然后将两者的结果进行交会，根据流体的门槛值在交会图中选择相应的部分，生成最终的高分辨率流体预测结果，可精细预测薄层流体。通过不同宽度泥岩墙的多层水平层状模型试算和实际资料的应用，结果表明：叠前AVA同步反演的横向分辨率高、纵向分辨率低；带岩性遮挡的地质统计学反演的纵向分辨率高且有一定的横向分辨率，但横向分辨率不如叠前AVA同步反演高；基于两者的高分辨率流体预测方法的纵、横向分辨率都高，对薄层流体的预测效果较好。

A high resolution approach for fluid prediction based on prestack AVA simultaneous inversion and geostatistical inversion

A high resolution approach for fluid prediction is proposed to accurately predict the fluid in thin layers. The approach carries out prestack AVA simultaneous inversion and the geostatistical inversion for water saturation with lithology masks in the same time. Then through crossing the results of them, the final high resolution result for fluid prediction is produced by selecting the part corresponding to the threshold values of the fluid in crossplots. It could precisely predict the fluid in thin layers. This approach is applied to three multilayer horizontal layered models with shale walls of different width and real data. The results show that prestack AVA simultaneous inversion has high resolution in the lateral direction and low resolution in the vertical direction. Geostatistical inversion with lithology masks has high resolution in the vertical direction and a certain resolution in the lateral direction, but the resolution in the lateral direction is not as good as that of prestack AVA simultaneous inversion. The joint use of these two methods for fluid prediction can obtain high resolution both in the vertical direction and in the lateral direction, and get good prediction results of thin layer fluid.