鄂尔多斯盆地二叠纪煤成气成藏特征

通过对鄂尔多斯盆地二叠系烃源岩，储集层，封盖条件及运移聚集特征的研究，认为盆地内部二叠系煤成气藏是地层封闭的岩性气藏，储集体的分布主要受沉积体系的控制，特别是山2期和盒9期的河流-三角洲沉积体系的控制，它们是盆内二叠纪煤成气藏的主力气层；并在结合前人研究成果的基础上，恢复了盆地的地热史划分出二叠纪煤成气运移的3个阶段，从而得出了二叠纪煤成气最后成藏期为中新世早期（喜山构造旋回），成藏期晚，生气，供气时间长，最大，有利于形成大型煤成气田。

RESEARCH ON THE CHARACTERISTICS OF PERMIAN HUMIC GAS POOLS IN ORDOS BASIN

Based on the research on the hydrocarbon source rocks,reservoir,cover condition and the characteristics of migration and accumulation,it is considered that the humic gas pools inside the basin are lithologic gas pools with stractigraphy trap and the distribution of reservoirs is mainly controlled by depositional system, especially the reservoirs of S2 stage and H9 stage which are the main gas reservoirs in the basin are controlled by the river-delta depositional system. The geothermal history is reconstructed and three stages of the migration of humic gas are divided according to the study of geodynamic history of the basin.It is believed that the last formation of gas pools occurred in Miocene,which was characterized by long time of gas formation and supply,and by large amount of gas reserve,which were favourable conditions for the formation of large-scale humic gas field.