在华北石炭二叠纪内陆表海聚煤盆地，海侵的突发性和事件性，泥炭沼泽化的广泛性和等时性，是划分其层序内部构成单元的良好界面。研究表明，华北石炭二叠纪内陆表海聚煤盆地的层序结构为“二元结构型”，即“海侵—高位”，缺少低位体系域。海侵体系域由１～２个小层序构成，而高位体系域由小层序构成。体系域恰与小层序组对应，海侵小层序组表现为弱退积—加积型，而高位体系域则表现为弱进积—加积型。小层序为高精度的岩相古地理编图单位，它为解析层序格架和煤聚积规律提供了最可靠的依据。

The Pemo-carboniferous epicontinental coal-accumulating basin in North China differs greatly to the continental marginal sea basin of North America in geological condition. The episodicity and eventness of transgression, the extensiveness and isochroneity are good surfaces for the classification of internal architectural units in sequence. Study shows that the architecture of sequence in the Pemo-carboniferous epicontinental coal-accumulating basin in North China is “dualistic pattern”, that is, “transgrassive-highstand”, lack of lowstand system tracts. The transgressive system tracts are composed of one to two parasequences, and highstand system tracts consist of more than two parasequences. The system tracts are all just corresponding to parasequence set. Transgrassive parasequence sets are weak retrogradational-aggradational type and the highstand system tracts are weak progradational-aggradational type. The parasequences are high precision map-compiling unit. They can provide reliable basis for the analysis of sequence frame and coal accumulation.