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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。
When the seismic wave passes through the oil-bearing gas sand body, the energy will have different levels of high-frequency attenuation. According to this characteristic, the prediction method of high and low frequency energy ratio is proposed. The method first decomposes the seismic volume into seismic data of different frequency bands by using S transform, and then selects reasonable high and low frequency data to solve the energy ratio and low energy ratio to characterize the high frequency attenuation anomalous band so as to achieve the purpose of predicting oil and gas content. Using this method, the prediction of oil and gas in the shallow channel sand bodies at the bottom of Minghuazhen Formation in Chengdaozhen Formation, Chengdao Formation, Jiyang Depression has achieved a predicted success rate of 78.5%. For Well Kuobei 42 well drilled in Minghua Town, After a good oil and gas show that the test oil yield exceeds 5t / d, this method proves that the method can solve the problem of the prediction of the hydrocarbon-bearing properties of shallow channel sand bodies in the Jiyang depression at present.