混源油定量研究在泥质白云岩油藏中的应用

Quantitative Study of Mixed Source Oil in Argillaceous Dolomite Reservoir

运用生物标志物绝对定量分析方法,利用萜烷比值参数、C_(29)甾烷成熟度参数对新沟油田原油混源比例进行了研究。结果表明,新沟油田新沟嘴组下段原油除有来自新一区、新二区低熟烃源岩外,还有来自新392井区的成熟烃源岩,其中新392井区是主要的供油岩。新二区Ⅲ油组成熟油供油比例基本占90%,Ⅱ油组、Ⅰ油组成熟油供油比例基本占70%~80%,新一区各油组成熟油供油比例略有降低。生物标志物定量分析技术在新沟泥质白云岩油藏中的可行性应用,对泥质白云岩油藏油气富集规律研究具有指导意义。

This paper studies mixed source oil ratio in Xingou oilfield using biomarker absolute quantitative analysis method, menthane ratio parameters and （;29 gonane maturity indicator. The findings show that besides low mature source rock from Xin 1 zone and Xin 2 zone, the crude oil of lower member of Xingou formation in Xingou oilfield consists of mature source rock from Xin 392 zone, major oil feeding rock. Oil Group 3 of Xin 2 zone supplies 90% mature oil. Feasibility application of biomarker absolute quantitative analysis method in Xingou argillaceous dolomite reservoir contributes to the research on the regularity of hydrocarbon enrichment in argillaceous dolomite reservoir.