科研之友
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摘要
Unconventional oil and gas are receiving more attention in the industry of energy. The prediction of the brittleness index of reservoirs in shale and tight sandstone has a great importance in predicting sweet spots and directing hydro fractures. However, the prediction of the brittleness index with the conventional pre-stack inversion faces some problems, such as the low vertical resolution of inversion results, the assumption of the constant background of V-P/V-S and the weak contrast of elastic parameters, and cumulative errors resulting from transformation among elastic parameters. To solve these problems, we rearrange the exact Zoeppritz equation into a function of the brittleness index, V-P and V-S (BI_Zoeppritz equation) instead of V-P, V-S and density. And the brittleness index can be inverted iteratively based on the theory of GLI from the high-resolution angle reflectivity obtained using basic-pursuit decomposition considering different incident angles. The tests of this algorithm on synthetic and real data show that this method can improve the resolution and the accuracy of the calculated brittleness index compared with the conventional approach.
- 出版日期2017-10
- 单位中国石油化工股份有限公司石油勘探开发研究院; 中国地质大学（北京）
