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通过对梨树断陷不同地区不同层位原油色谱、色谱/质谱等地球化学分析,系统地解剖了原油的地球化学特征。根据原油生物标志化合物组合特征的差异,将梨树断陷的原油划分为3种类型:Ⅰ类原油主要分布于东南斜坡带与四五家子油气田,具有较高的C24四环萜烷/C26三环萜烷值,较低的三环萜烷/五环三萜值、γ-蜡烷/C30藿烷值、Ts/Tm值、C29Ts/C29降藿烷值、C30重排藿烷/C30藿烷值和C29ββ/(ββ+αα)甾烷值;Ⅱ类原油主要分布在北部斜坡带,具有较低的C24四环萜烷/C26三环萜烷值,较高的三环萜烷/五环三萜值、γ-蜡烷/C30藿烷值、Ts/Tm值、C29Ts/C29降藿烷值、C30重排藿烷/C30藿烷值和C29ββ/(ββ+αα)值;Ⅲ类原油主要分布于中央构造带,各参数介于Ⅰ类和Ⅱ类原油之间。最后结合原油物性特征,建立了不同类型原油的地球化学判识指标,明确了原油的成因与来源。
The geochemical characteristics of crude oil were systematically dissected through geochemical analysis of crude oil, chromatogram / mass spectrometry and other layers in different layers of the Liushu faulted depression. According to the differences of the combination characteristics of crude biomarker compounds, the crude oil of rift depression in pear is divided into three types: Class Ⅰ crude oil is mainly distributed in southeastern slope zone and Siwugazi oil and gas field, with high C24 tetracyclic terpane / C26 Tricyclic terpenoid, tricyclic terpene value, γ-wax / C30 hopane value, Ts / Tm value, C29Ts / C29 norhopane value, C30 rearranged hopane / C30 Hopane number and C29ββ / (ββ + αα) sterane value. Type II crude oil is mainly distributed in the north slope zone, with lower C24 tetracyclic para / C26 tricyclic parapanes, higher tricyclic para / Pentacyclic triterpene value, γ-wax / C30 hopane value, Ts / Tm value, C29Ts / C29 norhopane value, C30 rearranged hopane / C30 hopane value and C29ββ / (ββ + αα) value; Class crude oil is mainly distributed in the central tectonic belt, the parameters between the class Ⅰ and class Ⅱ crude oil. Finally, according to the physical property of crude oil, geochemical identification indexes of different types of crude oil are established, and the origin and origin of crude oil are clarified.