鄂尔多斯盆地乌审旗上古生界砂岩地震预测

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

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 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.