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鄂尔多斯盆地晚三叠世长7期发育了一套半深湖-深湖相优质油源岩,是该盆地最主要的烃源岩。运用有机地球化学和有机岩石学相结合的方法,对鄂尔多斯盆地中部地区长7烃源岩进行了较系统的研究。鄂尔多斯盆地中部地区长7烃源岩在研究区内广泛分布,厚度分布在3～85 m之间,普遍分布在10～50 m间,整体上呈由研究区西南部向北、向东变薄的趋势;长7烃源岩有机质丰度较高,TOC值大部分超过1.0%,生烃潜力值大部分高于6.0 mg/g,氯仿沥青“A”值大部分高于0.1%,大部分属于“好”烃源岩级别;长7的烃源岩有机质类型主要为Ⅰ和Ⅱ1型,少量为Ⅱ2和Ⅲ型;长7的烃源岩镜质组反射率Ro值在0.54%～0.92%之间,最高热解峰温Tmax值在411～456℃之间,多数已处成熟生油气阶段。
The Ordos Basin developed a set of semi-deep lacustrine-deep lake facies source rocks in the late stage of Late Triassic, which is the most important source rock in the basin. By using the combination of organic geochemistry and organic petrology, the Chang 7 source rock in central Ordos Basin has been systematically studied. The Chang 7 source rocks in the central Ordos Basin are widely distributed in the study area, ranging in thickness from 3 to 85 m and generally from 10 to 50 m. They are generally northward and eastward thinning from the southwestern part of the study area . For the Chang 7 source rock, the abundance of organic matter is high, the TOC value is mostly over 1.0%, the hydrocarbon generation potential is mostly higher than 6.0 mg / g, and the value of chloroform bitumen “A ” is mostly higher than 0.1% Most of the source rocks belong to the “good” source rock level. For the Chang 7 source rocks, the organic matter types are mainly Type I and Type II1, while the minor ones are Type II2 and Type III; the reflectance Ro of the source rocks of the Chang 7 is 0.54 % ~ 0.92%, the highest pyrolysis peak temperature Tmax between 411 ~ 456 ℃, most of the mature oil and gas phases.