鄂尔多斯东南缘奥陶系碳酸盐岩成岩温度

鄂尔多斯东南缘奥陶系溶洞充填物的流体包裹体和稳定同位素研究,得到了四个不连续温度系列,其中44—46℃、59—61℃、104—118℃为加里东期,156—169℃为海西期。据此,可以认为下奥陶统的有机质在加里东期已达成熟,在海西期转化为气。根据下奥陶统马家沟组底部的流体包裹体均一温度资料和盆地周边中、上奥陶统较深水特征,鄂尔多斯中部曾接受过中、上奥陶统沉积,在加里东运动后方被剥蚀。

DIAGENETIC TEMPERATURE OF ORDOVICIAN CARBONATE ROCK IN SOUTHEAST MARGIN OF ORDOS

Studied the fluid inclusions and stable isotopes in the fillings of Lower Paleozoic dissolve burrows on the southeast margin of Ordos,four discontinuous temperature sequences were recovered:44—46℃,59—61℃ and 104—118℃ were Caledonian orogenic stage,156—169℃ was Hercynian orogenic stage.Therefore,it might be considered that organic matter of Lower Ordovician was mature in Caledonian stage and turned into gas in Her-cynian.According to the paleotemperature of the bottom of Majiagou Formation in LowerOrdovician and the deep water characters of Middle-Upper Ordovician on the basin periphery,it is suggested that the internal basin had received Middle-Upper Ordovician sediments which were eroded after Caledonian orogeny.