【摘要】 通过对孤东油田沙河街组烃源岩与沙河街组原油生物标志化合物特征的精细对比,将该区沙河街组原油划分为4种类型,第Ⅰ类原油Pr/Ph<0.81,Ts/Tm<0.49,γ蜡烷/C30藿烷>0.7,甾烷异构化参数αααC29甾烷20S/(20S+20R)在0.18~0.25,为来自孤南洼陷沙一段的低熟油;第Ⅱ类原油Pr/Ph>1.71,Ts/Tm>0.89,γ蜡烷/C30藿烷<0.09,αααC29甾烷20S/(20S+20R)在0.47~0.53,为来自孤南洼陷沙三段的成熟油;第Ⅲ类原油Ts/Tm>1,γ蜡烷/C30藿烷在0.50~0.95之间,αααC29甾烷20S/(20S+20R)为0.29~0.31,为前两者的混源油;第Ⅳ类原油Ts/Tm>1,γ蜡烷/C30藿烷0.21~0.32,αααC29甾烷20S/(20S+20R)在0.37~0.45,为来自黄河口坳陷沙三段和沙一段的混源油,其分布最为广泛。孤东油田经历了2次大规模的油气充注,分别发生在馆陶末—明化镇早期和明化镇晚期,明化镇晚期是最重要的成藏期。更多还原

【Abstract】 Gudong oilfield is a composite hydrocarbon accumulation zone with drape structure,in which there is a complex hydrocarbon accumulation relationship. The crude oil of the Shahejie Formation in the study area can be classified into four types according to the fine comparison of the biomarker compounds with the hydrocarbon source rocks. The first type of crude oil is the low mature oil from the first member of Shahejie Formation in Gunan subsag,its Pr / Ph < 0. 81,Ts / Tm < 0. 49,gammacerane / C30-hopane > 0. 7,the biomarker sterane isomerization parameter αααC29sterane’s 20 S /( 20 S + 20R) is 0. 18 ~ 0. 25; the second type of crude oil is the mature oil from the third member of Shahejie Formation in Gunan subsag,its Pr / Ph > 1. 71,Ts / Tm > 0. 89,gammacerane / C30-hopane < 0. 09,αααC29sterane’s 20 S /( 20 S + 20R) is 0. 47 ~ 0. 53; the third type of crude oil is the mixed oil from the first and the third member of Shahejie Formation in Gunan subsag,its Ts / Tm > 1,gammacerane / C30-hopane is 0. 50 ~ 0. 95,αααC29sterane’s 20 S /( 20 S + 20R) is 0. 29 ~0. 21; the fourth type of crude oil is the mixed oil from the first and the third member of Shahejie Formation in Huanghekou depression,it’s distribution is the most wide,its Ts / Tm > 1,gammacerane / C30-hopane is 0. 21 ~ 0. 32,αααC29sterane’s 20 S /( 20 S + 20R) is 0. 37~ 0. 45. Gudong oilfield has experienced large-scale hydrocarbon filling twice at least,in the later Guantao to the earlier Minghuazhen and in the later Minghuazhen respectively,and the later Minghuazhen is main hydrocarbon accumulation period.更多还原