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在柴达木盆地英东地区,利用交会图法对地层岩性进行识别。但是,地层的欠压实作用导致声波时差数值随深度增加整体变小,加上测量年代和测量仪器的差异,不同井位同类曲线的数值差异较大,这些因素都会导致岩性恢复结果的偏差。因此,根据地层孔隙度随深度指数递减的规律首先对声波时差曲线进行去压实校正;其次,对同类曲线进行归一化,并对具体操作方法进行优化,避免了个别极值对整体数据产生的随机影响。利用处理后的测井曲线恢复出的地层岩性与真实情况更为接近。在岩性恢复基础上,根据沿层提取的地震属性,对比测井曲线,预测平面上不同时期的砂体分布范围,并结合沉积相研究进一步预测有利储层的位置。
In the eastern part of the Qaidam Basin, the stratigraphic lithology is identified using the cross-plot method. However, due to the compaction of the strata, the numerical value of the acoustic time lag decreases with the increase of the depth, and the differences of the dating and the measuring instruments lead to large differences in the same type of curves at different well positions. All of these factors will lead to the deviation of the lithologic recovery results . Therefore, according to the rule that the porosity of the formation decreases with the depth index, the acoustic time difference curve is firstly de-compacted and corrected. Secondly, the normal curve of the same type is normalized, and the specific operation method is optimized, The random effects. The stratigraphic lithology recovered from the treated well logs is closer to the real one. On the basis of lithologic restoration, the distribution of sand bodies at different periods in the plane is predicted based on the seismic attributes extracted from the layers, compared with the well logging curves, and combined with the study of sedimentary facies to further predict the location of favorable reservoirs.