1. Research Institution of Petroleum Exploration & Development, Petro China, Beijing 100083, China;
2. China University of Petroleum (East China), Qingdao, Shandong 266555, China
Abstract：Ordovician carbonate reservoirs in western Erdos Basin are characterized by their thinness, strong heterogeneity, and strong reflection from Carboniferous layer. The dominant frequency of seismic data is rather low, resulting in the low resolution of conventional inversions. To solve this problem in carbonate reservoir characterization, we propose in the paper a full frequency simultaneous seismic inversion method. First we decompose seismic data into different frequency bands. Then we invert simultaneously the low, middle and high frequency seismic data based on Bayesian inversion theory. Since the full frequency information, especially high frequency information, is fully utilized, the inversion results can clearly delineate the cavity heterogeneity. Therefore, this inversion method is favorable for the carbonate reservoir characterization.
