横波预测技术在延川南地区储层预测中的应用

Application of Transverse Wave Prediction Technique in Reservoir Prediction

在延川南地区,通过开展测井横波模拟研究,获得测井的横波速度;采用叠前弹性参数反演技术计算纵、横波阻抗;利用砂泥岩在纵横波阻抗交汇图上的差异进行石盒子组砂岩储层预测,利用煤层与围岩在密度和阻抗方面的差异预测煤层的分布空间。通过横波资料可以有效地获得其它弹性参数,提高叠前反演的可靠性,降低叠后储层预测的多解性,提高储层预测精度。

In South Yanchuan, logging shear wave velocity is acquired by simulation study of logging transverse wave. Pre--stack elastic parameter inversion technique is applied to calculate the impedance of longitudinal and transversal wave. Sand reservoir of Shihezi Formation is predicted on the basis of the difference of sand shale on the cross plot of the impedance of longitudinal and transversal wave. According to the difference between coal bed and wall rock in terms of their density and impedance, the distribution space of coal bed is predicted. Transverse wave data can help acquire other elastic parameters effectively, improve reliability of pre--stack inversion and accuracy of reservoir prediction and reduce multiple solutions to post--stack reservoir prediction.