通过对鄂尔多斯盆地西缘奥陶系3类代表性的烃源岩即泥岩、泥灰岩和灰岩进行热模拟试验,不仅在室内再现了各类岩样的生烃演化过程及特点,而且为该地区生烃量计算提供了重要依据。试验结果表明,泥岩的生烃能力最强,最终产气率达527 m³/t_TOC,泥灰岩次之,最终产气率为512 m³/t_TOC,纯灰岩最差,最终产气率仅267m³/t_TOC;气态烃的产出与热成熟度密切相关,较高的热演化程度对气态烃的生成是有利的。指出此次试验所选3个样品的液态烃产率均较低,生油高峰不明显,热模拟的抽提物产率曲线呈“漏斗状”,认为这种现象可能与样品所处演化阶段以及有机质含量较低有关。

Thermal simulation experiments has carried out on mudstone, marlite and limeston e, three kinds of typical Ordovician source rock samples, from foreland basin of  western Ordos, not only revealed the evolve process and characteristics of hydr ocarbon generation indoors but also provided important parameter for calculation  the amount of hydrocarbon generation in this region. According to the results,  mudstone has the greatest potential yield of gas hydrocarbon, up to 527 m³/t_TOC, next marlite, 512  m³/t_TOC, and limestone has the poorest, o nly 267 m³/t_TOC; the yield of gas hydrocarbon is tightly correlated wi th the thermal maturity of source rock, higher thermal evolution degree is advan tageous to gas hydrocarbon generation; the yield of liquid hydrocarbon of the th ree experimental samples are all low, the peak of oil generation is obscure, and  the liquid hydrocarbon curve present as the shape of tundish, which could be co rrelated with evolution stages and lower content of organic matter.