【摘要】 地震波穿过含油气砂体时,能量会发生不同程度的高频衰减,根据这一特性提出高低频能量比的预测方法。该方法首先利用S变换将地震体分解为不同频率段的地震数据,再选择合理的高低频数据求解能量比,低能量比表征高频衰减异常带,以此达到预测含油气性的目的。利用该方法在济阳坳陷埕岛地区明化镇组底部浅层河道砂体中进行了含油气性预测,预测成功率达到了78.5%,完钻的埕北42井在明化镇组见到了良好的油气显示,试油产量超过5t/d,证明该方法可以解决目前济阳坳陷浅层河道砂体含油气性预测的难题。更多还原

【Abstract】 The energy may encounter different attenuation at high frequency when seismic wave passed through the hydrocarbon-bearing sand. According to the characterization of hydrocarbon reservoir,this paper proposed the hydrocarbon prediction method by means of the energy ration of high frequency to low frequency. It applies S-transform to transfer the original seismic data to different frequency seismic data,and chooses the reasonable high and low frequency data and then solves the energy rate between them. The low value area represents energy attenuation abnormality at high frequency, and predicts subsequently the existence of hydrocarbon. The new method was applied to predict hydrocarbon-bearing identification within the channel sand body in the bottom of Min-ghuazhen Formation in Chengdao area Jiyang Depression and the successful rate of prediction is up to 78.5%. The results of practical application show that it is an effective way to forecast the occurrence of hydrocarbon in Jiyang Depression at present.更多还原