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各大油田的油气勘探开发方向正逐渐向岩性等隐蔽油气藏转移,常规的反演存在一些缺陷,反演的精度难以满足精细勘探开发的要求。分频反演是一种非线性反演技术,具有不需要提取子波、不用构建初始模型、反演结果分辨率高等优点,从而弥补了常规反演的不足。本文首先介绍了分频反演的基本原理,然后对楔形地质模型进行正演模拟及反演处理,验证了该技术的有效性,最后对某地区的实际地震数据进行分频反演,结果表明:该方法可以有效识别储层的油层边界,效果优于常规反演。
The direction of oil and gas exploration and development in major oil fields is gradually shifting to subtle reservoirs such as lithology. The conventional inversion has some defects, and the precision of inversion can hardly meet the requirements of fine exploration and development. Fractional inversion is a non-linear inversion technique, which has the advantages of no need to extract the wavelet, no need to construct the initial model, and high resolution of the inversion result, so as to make up for the shortcomings of conventional inversion. In this paper, the basic principles of frequency-division inversion are introduced firstly. Then the forward simulation and inversion of the wedge geological model are carried out to verify the effectiveness of the technique. Finally, the actual seismic data in a certain area are inversely frequency-fractionated, and the result shows This method can effectively identify reservoir boundaries and is better than conventional inversion.