鄂尔多斯盆地乌审旗上古生界砂岩地震预测

针对鄂尔多斯盆地乌审旗区主要是含气砂岩与泥岩,其波阻抗差较小,气层厚度较薄的特点,应用并发展了一套储层地震预测技术,包括地震波形分类技术、地震波阻抗反演技术和储层含气性地震预测。经对19口井的钻前预测,砂岩预测符合率达84％,物性及含气性预测符合率达79％,发现了1 000×108m储量的乌审旗气田。

The seismic prediction technique of the Premian,Upper Paleozoic sand and its gas-bearing and the efficiency in Wushenqi Area,Ordos Basin

The Wushenqi Area of Ordos Basin is one of the important gas exploration field in recent years in this area. The reservoir in the Permian,Upper Paleozoic is lithic-quartzose sandstone. It is very difficult to predict the reservoir bed due chiefly to little impedence difference between gas-bearing sandstone and mudstone and thin gas horizon. Thus a series of seismic prediction techniques about reservoir bed has been developed, such as high resolution seismic exploration technique,seismic wave shape classification technique,seismic impedence inversion technique, and seismic gas-bearing prediction of reservoir bed as well. All that are effective. By practicing in 19 wells,the ratio between predition and fact in sandstone prediction is 84% and is 79% in petrophysical properties and gas-bearing prediction. Using these techniques, we have found the Wushenqi Gasfield with hundred billion square reserves.