关键词: 固体¹³CNMR, 芳核平均结构尺寸, 生烃潜力, 热演化指标

Abstract: ¹³C NMR(CP/MAS+TOSS and CP/MAS+TOSS+DD)that chemical composition and structure feature of kerogen with the characteristics of different types and evolution degree has been studied by using the solid state,furtherly,the relationship between these structure parameters,potential and evolution degree of kerogen has also been analysed.The results,show that the alkyl carbon is the major contributors to oil and gas.The content of carbon alkylicity(f_a1)has positive correlation with the hydrocarbon producing potential indicators,e.g.hydrogen index(I_X),H/C atom ratio.The content of oil potential carbon quickly decreases at the stage of oil producing window and that of gas potential carbon decreases during the whole evolution process.The detailed analysis of structure parameters,including carbon aromaticity(fa),the hydrogen aromaticity(H a),and the average aromatic cluster size(X_b),shows that X_b is the most effective indicator of evolution degree,it is not influenced by type and evolution degree of kerogen.This paper has also establised the correlation between the average aromatic cluster size and the vitrinite reflectance value of kerogen.

Key words: ¹³C NMR, the average aromatic cluster size, source rock potential, thermal evolution indicator