The reflection wave of coal layer has been filtered,the diffracted wave scattered from the break point is enhanced,and the interpretation of samll KCC is improved.

• 在深入分析松辽盆地北部各断陷天然气成藏条件的基础上 ,指出各断陷在烃源岩发育、有机质演化程度和盖层条件上存在明显的差异。