三分量地震技术在四川广安地区的应用

四川广安地区上三叠统须家河组储集层非均质性强,常规勘探难以可靠预测含气层。三分量地震具有较大的信息量,可更准确地确定地下储集层和流体特性。在得到高品质的三分量地震勘探数据的基础上,利用转换波静校正、转换点计算、转换波速度分析与动校正等一系列处理技术,获得了波场信息丰富、波组特征明显的转换波剖面。通过纵波波阻抗反演与转换波弹性阻抗反演联合解释,有效地预测出该区有利储集层的分布。

Application of 3-C Seismic Prospecting Technique in Guang'an Area, Sichuan, China

For the serious heterogeneity of Xujiahe reservoir of Upper Triassic in Guang'an area, Sichuan, China, it is hard to accurately predict the gas-bearing intervals using conventional P-wave seismic prospecting technique. 3-C seismic prospecting technique can be used to get more subsurface information and better identify the features of reservoir rocks and fluids, hence decreasing the multi-resolution from it. Based on the high-quality 3-C seismic data available, several seismic processing techniques such as converted wave static correction, transfer point computation, converted wave velocity analysis and dynamic correction are used for obtaining abundant wavefield information and distinctive features of wave groups in this paper. And the composite interpretation of P-wave impedance inversion profile and converted wave elastic impedance inversion profile has allowed to effectively predict the distribution of favorable reservoir rocks and gain some preliminary results in this area.