中部油气成藏组合主要分布在第二、第三台阶区；

The middle oil-gas reservoir-forming assemblage is mainly distributed in the second and the third step regions.

youdao

中部油气成藏组合主要分布在第二、第三台阶区；

The middle oil-gas reservoir-forming assemblage is mainly distributed in the second and the third step regions.

youdao