正演技术在永安地区砂体预测中的应用

Application of Seismic Forward Technology in Sand Prediction of Yong'an Area

针对永安复杂小断块利用基于数学理论法优选地震属性难及现有时窗提取的属性反映沉积相特征差的问题,提出了结合地震资料质量评估,利用正演技术来确定敏感地震属性以及属性提取时窗。研究表明,基于正演技术优选出的均方根属性与砂体发育情况有很好的对应关系,结合正演模拟确定的时窗在永安地区提取了均方根属性,该属性很好地展示了平面上砂体发育展布情况,预测的砂体展布符合地质规律。随后钻井也证实了研究成果的可靠性,说明了正演技术研究成果可以指导实际砂体的预测。

Due to the problems being difficult to extract seismic attribute by using of mathematic theory and the poor sedimentary facies in attribute obtained by using time-widiow,it was proposed that evaluation was performed in combination with the quality of seismic data.In consideration of the problems,forward technology was used to determine the sensitive seismic attributes and time-window of attributes.The research shows that extracting the RMS is in good correspondence with sand development.The attribute extracted by using the forward technology is determined in combination with forward simulation,it indicates well the sand distribution in plane and the sand prediction is consistent with geologic regulation.The reliability is demonstrated in consequent well drilling,it shows that the forward technique can be used for guiding sand prediction.