四川盆地三台—合川区块地震技术应用效果分析及适用技术评价

Application of Prestack Reservoir Prediction Technology in Santai-Hechuan Area, Sichuan Basin

四川盆地上三叠统须家河组陆相碎屑岩蕴藏巨大油气资源潜力,近年来在川中合川、广安等地区均钻获高产气流。研究区须家河组气藏以岩性气藏和岩性—构造气藏为主,储层纵横向非均质性强,以薄互层为主,具有低孔低渗的特点,同时储层含流体情况复杂,储层预测和含气性检测的难度较大。针对须家河组此类低孔低渗透岩性气藏,通过叠前保真处理技术获得高品质叠前道集,利用以弹性参数反演为主的叠前储层定量预测技术,以及综合弹性多参数法和扩展弹性阻抗反演的流体检测技术,有效提高了研究区须家河组储层和含气性预测的精度,取得了良好的应用效果。

There is huge gas resource potential in the continental facies clastic reservoir of Xujiahe Formation in Upper Triassic of Sichuan Basin. In recent years, commercial gas flow has been got in central Sichuan, such as Hechuan and Guang'an etc. In the study area, Xujiahe gas reservoir is mainly lithologic gas reservoir and compound traps of lithologic-structural gas reservoir. The reservoirs are very heterogeneous horizontally and vertically, and most of them are thin interbedding with low porosity and low permeability. Moreover, the reservoir fluid contents are very complex, so it is very difficult to perform reservoir prediction and fluid detection. Aimed at this type of lithologic gas reservoir, prestack high-fidelity processing technique has been applied to obtain prestack gathers with high quality, then, prestack quantitative reservoir prediction technique, mainly including elastic parameter inversion, as well as hydrocarbon detection technique which integrates elastic multi-parameter method and expanded elastic impedance inversion have been applied to improve the accuracy of reservoir prediction and fluid detection, and good application effects have been achieved.