复杂山地构造逆掩断裂带的地震反演方法研究

Study on Seismic Inversion Parameter Optimization within Reverse Fault Block in Complicated Mountainous Structure

地震勘探领域已经由简单的背斜构造圈闭向复杂断裂构造和岩性圈闭转变，地震储层预测的难度越来越大，特别是复杂山地构造逆掩断裂带的地震反演储层预测方法较为缺乏，难度更大。常规的逆掩区域的处理方式是只取断层上盘或下盘来完成地震反演的储层预测，这样可能导致信息丢失，形成错误的判断．作出不充分的决策。针对这个问题，文中研究了分块反演的算法和反演参数自动评判的方法。该方法能够自动优选反演参数，并能同时反演计算出复杂逆掩构造的上、下盘，进行综合储层预测。通过对理论模型和DKH构造实际数据反演计算，表明该反演算法正确可靠，反演参数评判方法能大大提高反演参数测试的效率．而且利用该方法的反演结果预测的储层边界更加清晰、可预测区域更大。

Seismic exploration has been evolved from simple anticline structure to complicated fault structure and stratigraphic trap, which means that the difficulty of reservoir prediction based on seismic data also increases dramatically. Seismic inversion method aiming at complicated reverse fault structures is particularly deficient, causing even greater difficulties. In routine inversion method, only the hanging wall or the footwatl of reverse faults will be taken into consideration in seismic inversion reservoir prediction, which will result in information loss, wrong judgments and insufifficient decisions. This paper studied the block inversion algorithm and inversion parameter auto-judging method. These methods can automatically optimize inversion parameters and can calculate the hanging wall and footwall data of complicated reverse faults together and perform reservoir prediction. The inversion calculation of theoretical model and DKH actual structure data indicate that the Reverse Fault Block Inversion method is useful and accurate for complicated reverse fault structures, and the parameter optimization method can greatly improve the efficiency of inversion parameter selection. The inversion results from these methods have better reservoir boundary and larger prediction area.