The application of colored inversion to reservoir prediction in sparse well zone
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摘要: 阐述了有色反演的基本原理,并给出了反演流程。通过模型试算,明确有色反演关键参数的物理意义及取值范围,并在孤南洼陷实际工区应用,较好地刻画出沙三下早期低位扇体的横向展布范围。与常规地震属性相比,反演结果更加符合沉积规律,与实钻井岩性分布情况吻合程度高。表明有色反演在保留地震数据原始现象的基础上,分辨率明显提高,适合无井或少井区的地层或岩性解释。Abstract: Every inversion method has its own characteristics and applicable conditions. The inversion based on model can obtain high resolution in vertical and horizontal direction, but the inversion result is affected obviously by wells and wavelet. So it can be used to in-terpret lithologic body in multiple wells area. Colored inversion is a kind of frequency domain inversion method, which does not depend on initial model and needs limited wells. Moreover, the inversion result is faithful to seismic data and the inversion process is relatively simple. By building forward model and testing parameter, the authors got to know the physical meaning and range of inversion parame-ters. By using this method, the authors preferably depicted the lateral distribution characteristics of fan body in lower Es3 of Gunan sag. Compared with conventional seismic attributes, the colored inversion results are more coincident with the deposition rules and the lithol-ogic distribution of the actual drilling wells. It is shown that the colored inversion method could improve the resolution of seismic data based on keeping the original phenomena, and hence it is suitable to interpreting the strata or lithologic characteristics in sparse or no well zone.
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Key words:
- colored Inversion /
- frequency domain /
- matching operator /
- sparse well zone /
- reservoir prediction
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