摘要
松辽盆地中央坳陷原油向盆地边缘运移过程中发生降解,在西部斜坡形成油砂矿藏,油砂油密度和黏度大、不流动。在运移方向上,套保—小太平山—西北沟—图牧吉地区的上白垩统姚家组油砂油随深度变浅饱和烃和芳香烃含量减少,非烃和沥青质含量增加,全油和饱和烃碳同位素变重,以上参数在小太平山单井样品中随深度变浅呈相反变化趋势。气相色谱质谱分析发现,油砂油降解级别为Wenger 2～8级,大多数样品饱和烃中正构烷烃和类异戊二烯烷烃缺失,藿烷部分降解,小太平山地区发现25-降藿烷;套保—图牧吉地区随深度逐渐变浅,生物降解程度逐渐增加,三环萜烷/五环三萜烷、C27重排甾烷/规则甾烷、二苯并噻吩/菲等生物标志化合物参数均呈规律性变化。小太平山地区,25-降藿烷和其对应藿烷的质量分数、二者的比值,均反映出生物降解程度随深度变深而增加,藿烷抗降解能力随碳数的增加而增加,升藿烷22R构型抗降解能力大于22S构型。松辽盆地西部斜坡油砂油降解的规律是:由深部厌氧环境向地表喜氧环境运移的过程中,油砂油降解程度逐渐增大,单井样品中随深度和含水饱和度的增加降解程度逐渐增大。
The degradation occurred to the crude oil in the migration process from central depression to the margin of Songliao Basin,thus forming the oil sand reservoir in the western slope,where the extracts of oil sand are non-liquid with high density and viscosity.In Taobao-Xiaotaipingshan-Xibeigou-Tumuji area along the migration direction,for the oil sand extracts in Upper Cretaceous Yaojia Formation,the content of saturated aromatic hydrocarbons decreases with the depth shallowing,the content of unsaturated asphaltene increases,the carbon isotopes of whole oil and saturated hydrocarbon become heavier.The parameters above present an opposite variation trend in the single-well samples of Xiaotaipingshan area.Based on GC-MS analysis,the degradation levels of oil sand extracts are Wenger 2-8,the n-alkanes and isoprenoid alkanes in saturated hydrocarbons of most samples are missing,hopanes are partially degraded,and 25-norhopanes are detected in Xiaotaipingshan area.With the decreasing of depth in Taobao-Tumuji area,the biodegradation levels increase gradually.Biomarkers parameters present regular variations,such as tricyclic terpane/pentacyclic triterpane,C27 diasteranes/regular sterane,dibenzothiophene/phenanthrene,and etc.In Xiaotaipingshan area,the mass fractions of 25-norhopanes and corresponding hopanes as well as their ratios present that the biodegradation levels increase with the increasing of depth,the degradation resistance of hopanes increase with the carbon number increasing,and 22 R homohopanes have greater biodegradation resistance than 22 S homohopanes.at the western slope of Songliao Basin,the degradation laws of oil sand extracts are as below:in the migration process from a deep anaerobic environment to a surface aerobic environment,the degradation level of oil sand extracts gradually increases with the increasing of depth and water saturation in the single-well sample.
作者
郝国丽
单玄龙
李锋
仝立华
刘轶松
王书琴
张家强
赵成弼
Hao Guoli;Shan Xuanlong;Li Feng;Tong Lihua;Liu Yisong;Wang Shuqin;Zhang Jiaqiang;Zhao Chengbi(College of Earth Sciences,Jilin University,Jilin Changchun 130061,China;Oil & Gas Survey,China Geological Survey,Beijing 100083,China;Key Laboratory of Unconventional Petroleum Geology,China Geological Survey,Beijing 100083,China;Jilin Geological Exploration Institute,China Chemical Geology and Mine Bureau,Jilin Changchun 130033,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2019年第3期308-321,共14页
Acta Petrolei Sinica
基金
中国地质调查局"松辽
柴达木
二连等盆地油页岩油砂基础地质调查"项目(DD20160188)
吉林省科技发展计划项目(20140520147JH)资助
