But the cognition of source rocks and crud oil has not been systemized and the source of oil has a degree of bifurcation.

由于其烃源岩及原油的认识还未进一步系统化，且其油源问题尚存在较大的分歧。

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But the cognition of source rocks and crud oil has not been systemized and the source of oil has a degree of bifurcation.

由于其烃源岩及原油的认识还未进一步系统化，且其油源问题尚存在较大的分歧。

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