东濮凹陷濮城地区沙一段盐湖相原油地球化学特征  

Geochemical characteristics of salt lake facies oil from member 1 of Shahejie formation in Pucheng area in Dongpu depression

作　　者：常振恒[1] 陈中红[1] 王兴武[2] 赵广珍[2] 王志萍[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]中原油田分公司勘探开发科学研究院,河南濮阳457001

出　　处：《中国石油大学学报（自然科学版）》2007年第3期22-27,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中石化科技攻关项目(P04022)

摘　　要：应用地球化学研究手段,对东濮凹陷濮城地区沙一段盐湖相烃源岩岩样、原油样和油砂样进行了族组分、饱和烃色谱-质谱实验分析。结果表明,濮城地区沙一段原油与含油砂岩抽提物的饱和烃含量在47.39%～65.33%,族组分碳同位素分布在-28.06‰～-26.29‰,芳烃、非烃和沥青质组分之间的同位素分馏效应较小;w(Pr)/w(Ph)小于0.5,具有明显的植烷优势;甾烷w(C2920R)/w(20(R+S))为0.23～0.27,w(C29ββ)/w(αα+ββ)为0.19～0.40,甾烷系列中C27含量略占优势,重排甾烷含量极低;γ-蜡烷含量较高,w(γ-蜡烷)/w(C30藿烷)在0.60左右,w(γ-蜡烷)/w(HC3122S)大于2.0,三升藿烷～五升藿烷呈“翘尾”状升序分布,反映了高盐度水体沉积环境下形成的未熟-低熟油特征。油源对比分析认为其烃源灶为沙一段泥岩和部分沙三段泥岩。The group composition of oil, chromatogram and mass spectrum of aliphatic were experimentally analyzed on the samples of source rocks, crude oil and oil sand from Pucheng area in Dongpu depression. The results show that the content of saturation hydrocarbon of the samples is 47.39% - 65.33%. The carbon isotope of group composition of crude oil is - 28. 06%0 - - 26.29%0, and the fractionation effect of the carbon isotope of group composition is not obvious. There is predominance of phytane to pristane, and the ratio of pristane to phytane is lower than 0.5. The value of the parameters of w （αααC2920R）/w （20 （ R ＋ S） ） and w （ C29ββ）/w （ αα ＋ ββ） is 0.23 - 0.27 and 0.19 - 0.40 , respectively. The content of diasteranes is low, and the sterane of C27 is predominance in the series of steranes. The content of gammacerance is high. The ratio of gammacerance to C30hopanes is 0.6, and the ration of gammacerance to HCn22S is more than 2.0. The dis- tribution from C33-horpanes to C35-horpanes is ascending, which shows the geochemistry characteristics of the oil in low mature formed in the sedimentary environment of high salty. Its source rocks are the mudstone of member 1 and member 3 of Shahejie formation.

关 键 词：东濮凹陷 沙一段 盐湖相 低熟油 生物标志物 地球化学特征 

分 类 号：P593[天文地球—地球化学]