库车坳陷克拉苏构造带西部原油地球化学特征研究

Geochemical Characteristics of Crude Oil from Western Kelasu Tectonic Belt in Kuqa Depression

利用GC-MS(气相色谱-质谱法)对克拉苏构造带西部的原油样品中生物标志物特征进行了研究,研究表明,大北、大宛齐原油具有高姥植比(Pr/Ph),三环萜烷以C19(或C20)为主峰,由未知藿烷和重排类生物标志物相对含量较高的特征,推测上述地区原油可能为煤成油;克拉2、克拉3原油Pr/Ph较低,三环萜烷以C21为主峰,重排类生物标志物含量也较低,上述地区原油可能为湖相油。

The characteristics of biomarker in crude oil from western Kelasu tectonic belt in Kuqa depression are analyzed by GC-MS.Comprehensive analysis of vaious biomarkers shows that the oils from Dabei and Dawanqi Oilfields have high Pr/Ph ratio,C19-tricyclic terpane or C20-tricyclic terpane as the main peak,the abundance of tetracyclic terpene alkyl and rearranged biomarker areobvious high,these geochemical characteristics indicate the oils from the two oilfields are coal-derived oils,the oils from Kela 2 and Kela 3 oilfields have lower Pr/Ph,C21-tricyclic terpane as the main peak,the abundance of tetracyclic terpene alkyl and rearranged biomarker is lower,these geochemical characteristics indicate the two oils are lacustrine oils.