鄂尔多斯盆地大牛地气田盒3段辫状河道沉积相预测

鄂尔多斯盆地大牛地气田二叠系下石盒子组盒3段属于辫状河道沉积,地震属性及反演预测受地震分辨率限制以及上覆的上石盒子组底砂岩的影响,造成河道砂岩储层预测的多解性。该文在高分辨率层序地层格架控制下,通过合成记录对比及地震反射特征剖析,归纳出盒3段顶界面地震反射波T9f的4种地质含义,在此基础上,应用波形地震相分析方法,通过地震相、测井相及沉积相综合研究,较好地预测出辫状河道沉积微相展布及河道砂岩发育的有利区。在大牛地气田D66井区的砂岩预测结果中与实际钻探吻合率达90%。由此表明,以沉积相、沉积特征约束下的波形地震相划分,能实现对复杂地质体的准确预测和描述。

Sedimentary facies prediction of braided channel of the third member of Shihezi Formation in Daniudi Gasfield, Ordos Basin

The reservoirs of the third member of Permian Shihezi Formation in Daniudi Gasfield in Ordos Basin are braided channel sediment. The reservoir prediction of channel sand is uncertain because of seismic resolution and overlying sandstone of upper Shihezi Formation. Under the constraint of high resolution sequence stratigraphic framework, and based on the comprehensive analysis of synthetic seismogram and seismic reflection characteristics, it is recognized that there are four geologic implications of seismic...