鄂尔多斯盆地固城地区延长组长7富有机质油页岩有机地球化学特征

Organic Geochemical Characteristics of Organic-Matter-Rich Oil Shale in the Yanchang Formation Chang7 Reservoirs of Gucheng Area, Ordos Basin

对鄂尔多斯盆地伊陕斜坡西南部固城地区延长组长7富有机质油页岩进行了全岩有机碳、热解、干酪根镜检、干酪根碳同位素、可溶有机物饱和烃色谱、饱和烃色谱一质谱等研究。结果表明：长7富有机质油页岩有机质含量较高，干酪根类型为Ⅰ－Ⅱ1型，其有机质来源以藻类等湖生低等生物为主；长7富有机质油页岩形成于还原性深水湖相环境，且水体盐度较低；长7富有机质油页岩成熟度较高，已达到生油高峰演化阶段；长7富有机质油页岩生烃能力很强．生烃强度达到2．64×10^6dkm2。

The organic-matter-rich oil shale in the Yanchang Formation Chang7 reservoirs of the Gucheng area of the southwestern Ir-Ju Shaanxi slope, Ordos Basin, is studied on the entire organic carbon, pyrolysis, kerogen examination with microscope, the kerogen carbon isotope, saturated hydrocarbon chromatogram of soluble organics, saturated hydrocarbon chromatogram - mass spectrometry, and so on. The results show that the organic-matter-rich oil shale in the Chang7 reservoirs has higher levels of organic matter, with kerogen type I - I1 ~. The source of organic matter takes lacustrine lower organisms, like alga etc. as the dominated. The Chang7 organic-matter-rich oil shale was formed in the deoxidized deep-lacustrine-facies environment, with low salinity water;, The Chang7 organicmatter-rich oil shale has high maturity, reached the evolution stage of oil-generation peak; with strong hydrocarbon generation capacity. The hydrocarbon generation strength is 2.64×10^6t/km2.