苏里格气田苏147井区盒8段二维地震储层预测

摘要

In order to improve the precision of low tight sand reservoir,some special processing methods were selected to improve resolution in 24 2-D seismic lines acquiring in different years,and elastic parameter sensitivity analysis was carried out on He8 major gas-producing layer of fluvial reservoir in Su147 block. Research results shows that key sensitivity parameters for reservoir predicting are S-wave impedance ,P-wave to S-wave velocity ratio and Poisson ratio. The thresholds of the three parameters are as follows:sand reservoir ’ S-wave impedance is 7 000 8 500 g·m/s·cm3,gas-bearing reservoir’s P-wave to S-wave velocity ratio less than 1.6 and Poisson ratio less than 0.18. From the above,2-D seismic inversion,gas-bearing predictions and distribution feature describe are carried out in the research,and all of them will provide scientific foundation to the gas field.%为提高致密低渗气田薄储层预测精度，对不同年度采集的二维地震数据从道集和提高分辨率角度进行特殊处理，选取鄂尔多斯盆地苏里格气田苏147井区主力产气层盒8段河流相储层做弹性参数敏感性分析，优选出横波阻抗、纵横波速度比、泊松比这3类储层预测敏感因子，确定横波阻抗门槛值在7000~8500 g·cm-3·m·s-1之间为砂岩，纵横波速度比小于1.6或泊松比小于0.18为含气砂岩.由此开展二维地震反演和储层含气性预测，指明研究区盒8段砂岩和含气砂岩储层的平面分布特征，为气田平稳开发提供合理依据.