多井约束地震反演技术在储集层预测中的应用

Application of Multi-Well Constrained Seismic Inversion to Reservoir Prediction

兰尕背斜带处于塔河油田南部,具有发育非背斜圈闭的条件,勘探程度较低,依赖于初始模型的常规反演方法难以获得精确的反演结果。而约束稀疏脉冲反演不依赖模型,其反演的精度取决于原始数据特征。为此,在兰尕地区利用约束稀疏脉冲反演技术进行了储集层预测。介绍了约束稀疏脉冲反演技术的基本原理及其实现方法;提取了井旁地震道的子波,做了合成记录,对层位进行了标定;用约束稀疏脉冲反演方法进行了波阻抗反演,得到了绝对波阻抗剖面;并把绝对波阻抗剖面转换成了砂泥岩剖面,其反演结果与井的钻探结果基本吻合。

Langa anticline belt located in southern Tahe oil field is of condition of non-anticline trap with low degree of exploration. The conventional inversion method depending on the initial model could inversion not be used to get exact inversion result, while the constrained sparse-pulse inversion does not depend on any model but on the characteristics of original data. This paper presents the principle of the constrained sparse-pulse inversion technology and its application to Langa area in reservoir prediction, including extraction of the wavelet of seismic traces near the borehole, synthetic seismogram, horizon calibration, wave impedance inversion, and conversion of obtained the absolute wave impedance profile into sand-shale seismic profile. The results are accordant with the drilling results.