松辽盆地南部梨树断陷秦家屯油田原油芳烃地球化学特征  

Geochemical Characteristics of Aromatic Hydrocarbons of Crude Oil in Qinjiatun Oilfield of Lishu Fault Depression in the Southern Songliao Basin

作　　者：陈小慧[1] 张敏 程熊[1] 

机构地区：[1]长江大学地球环境与水资源学院 油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100

出　　处：《石油天然气学报》2013年第8期28-31,48,共5页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(40973041)

摘　　要：松辽盆地南部梨树断陷秦家屯油田原油以正常密度、高蜡、中等黏度、低硫为特征,原油色谱-质谱分析结果显示:芳烃组成相似,其中双环化合物含量最高,其次为三环化合物和三芴系列,四环化合物含量最低,总体上表现为萘>菲>联苯>艹屈>三芴的分布规律。萘系列(平均含量48.81%)和联苯系列(均值8.4%)含量较高,少量的萤蒽和芘类化合物以及萘系列中较丰富的1,2,5-TMN和1,2,7-TMN,说明生油母质中有高等植物输入;原油中1,2,5-/1,3,6-TMN与1,2,5,6-TeMN/TeMN比值较高,其均值分别为0.61和20.67,三芴系列中氧芴占38.7%,表征其烃源岩沉积于弱氧化-弱还原的淡水湖相环境;原油样品的TMNr和TeMNr分别为0.28～0.52与0.36～0.52,甲基菲指数MPI1为0.28～0.51,利用MPI1折算的Rc为0.60%～0.72%,反映原油为低熟～成熟演化阶段的产物。Most of crude oils from Qinjiatun Oilfield of Lishu Fault Depression in the south of Songliao Basin were characterized by normal density,higher wax,moderate viscosity,as well as lower sulfur content.Geochemical characteristics of aromatic hydrocarbons were discussed on the basis of GC-MS analysis of crude oil samples.The analysis results show that similar composition of aromatic hydrocarbons,and the content of bicyclic compounds are the highest,next are the tricyclic compounds and three fluorene series compounds,the lowest content is the tetracyclic compounds,the distribution mode display generally from high content to low content includes naphthalene series,phenanthrene series,biphenyl series,chrysene series,dibenzofuran series,flulrene series and dibenzothiophene series.Abundant naphthalene homologues(with an average of 48.4%) and biphenyl homologues(average of 8.4%),and small amount of the fluoranthene and pyrene with predominance of l,2,5-trimethylnaphthalene and l,2,5,6-tetramethylnaphalene in naphthalene homologues indicate that terrigenous higher plants are organic matter sources;1,2,5-/1,3,6-TMN and 1,2,5,6-TeMN/TeMN ratios are high,average is 0.61 and 20.67 respectively with abundant dibenzofuran,these data show that these oil samples are originated from the weak oxidation to weak reduction environment with freshwater lacustrine condition;and the index of TMNr and TeMNr is respectively 0.28~0.52 and 0.36~0.52,and the range of methylphenanthrene index(MPI1) is from 0.28 to 0.51,and the maturity Rc caculated from MPI1 is between 0.60% and 0.72%,these maturity parameters present that the samples are low mature to mature oils.

关 键 词：梨树断陷 秦家屯油田 原油 芳烃 地球化学特征 

分 类 号：P618.13[天文地球—矿床学]