试论地震约束反演的不适定性

Discussion of the uncertainty on seismic constraint inversion.

地震反演技术作为储层预测的有效手段 ,在隐蔽油气藏勘探中发挥了重要作用。但是 ,由于诸多的主观和客观因素 ,该项技术的应用出现了不同程度的偏差。文章分析了地震反演原理与算法、反演过程中地震资料的品质、测井资料的非归一化、子波选取及常数化、层位标定和初始模型的准确度、地层模型的局限性、地震反演的适用性等多方面因素对反演结果的影响 ;列举了这些影响带来的不适定性的部分实例 ;提出了反演技术运用的一些保障措施。

Seismic inversion is an effective measure to predict reservoir. It takes an important role in exploring the subtle reservoirs. Nevertheless, deviations with various degree is made in the application of this technique because of many subjective and objective factors. The factors that influence the inversion results are analyzed, such as theory and algorithm of the seismic inversion, quality of the seismic data, unnormalization of log data, wavelet extraction and constant making, accuracy of horizon marking and initial model, limitations of stratigraphy model and applicability of the seismic inversion and so on; some examples of uncertainty caused by these influence are cited; and some ensuring measures in the application of the seismic inversion are put forward.