鄂尔多斯盆地地温场与烃源岩演化特点

通过对鄂尔多斯盆地地壳结构、岩石热导率和生热率的综合研究，盆地莫霍面现今平均温度为５６８．５℃。各层面地温场展布可归纳为三种展布形式，分别以莫霍面、中元古界底面和侏罗系底面为代表。对应于生油门限的范围是侏罗系底面（现今平均温度为４５．８℃）－寒武系底面（现今平均温度为１１７．３℃）．生油门限的上界，在盆地西北部为１３００ｍ左右，在盆地南缘为１７００ｍ左右，在盆地东部为１２００ｍ左右．

TEMPERATURE FIELD AND EVALUATION OF PETROLEUM IN THE ORDOS BASIN

According to the experimentation of heat generation, heat conductivity, etc.,the Ordos basin is characterizing of its average temperature of Moho 568.5℃.Three temperature distribution-types can be recognized in the basin from Moho to surface, represented by those on the bottoms of the Moho, Middle Proterozoic and Jurassic. The liquid window for petroleum generation in the basin occurs from the bottom of Jurassic to the bottom of Cambrian, with its corresponding temperatures at present ranging from 45.8℃ to 117.3℃. The top of the liquid window locates at the depth 1300 m in the northwest,1700 m in the south, 1200 m in the east of the basin.