摘要
位于准噶尔盆地东部白家海凸起上的彩南油田，其原油芳烃地球化学特征与阜康凹陷原油具有同源性，与该区中、下侏罗统湖相烃源岩有密切关系。原油及烃源岩中芴含量相对较高（35％～55％），氧芴次之（25％～45％），硫芴低（6％～35％），反映为淡水湖相环境沉积生烃。芳烃馏分中菲和苊菲系列的含量最高，平均原油为32．45％，烃源岩为30．08％；萘系列原油平均为22．16％，烃源岩为22．25％。白家海原油DBT／P值比海相原油低，Pr／Ph值比海相原油高，油源来自湖相淡水沉积。研究表明，二苯并噻吩化合物愈高，菌解无定形体含量愈低。白家海凸起湖相烃源岩二苯并噻吩均低于8．5％，为微生物的生存与活动创造了一个良好的生境，有利于细菌降解有机质及类脂物富集。从甲基菲参数看，烃源岩演化程度较低，与实测Ro值（0．53％～0．64％）相近，为低成熟阶段生油。在准噶尔及其它盆地，寻找来自侏罗系湖相烃源岩的低熟油藏颇具潜力，为丰富和发展陆相早期生油理论提供了重要依据。
Cainan oil field is located at the Baijiahai convexity in the eastern part of the Junggar basin. The aromatic geochemicalcharacteristics of its crude oils show that it has the same source with crude oil from the Fukang depression, and they all are inclose relationship with lacustrine hydrocarbon source rocks from the Middle and Lower Jurassic series in the Fukangdepression and Baijiahai area. The fluorene content is more (35%-55% ) and next is dibenzofuran (25%-45%), and theamount of dibenzothiophene is less relatively (6%-35% ) in the oil and rock samples of the Baijiahai convexity, whichindicates that hydrocarbons are formed in the environment of the fresh water lake factes. Total amount of phenanthrene andacenaphthylene compounds is the highest, its average value is 32. 45% in crude oil and 30.08% in source rock. The averagecontent of naphthalene series is 22. 16% in crude oils, but is 22. 25% in source rocks. In the Baijiahai oil samples, the DBT/Pratios are lower than that of crude oils from marine factes, and Pr/Ph values are higher than oils from marine factes, whichshows that oil source is mainly derived from the fresh water sediment of lake factes. Studies suggest that the amount ofbacteridecomp - amorphimie reduces with the increasiug o f dibenzothiophene compound. It makes a good life condition forbacterial grow and reproduce, because dibenzothiophene content is lower than 8. 5% in aromatics of the Baijiahai source rocksof lake factes. According to alkylphenanthrene parameter, source rock evolutionary level is lower, compared with real R0value (0. 53%-0. 64% ), they are close to each other, petroleum and natural gas are formed at the lower mature stage.Therefore, the prospecting of low mature oil reservoir in the Jurassic system of the Junggar basin or other basin has greatpotentialities, but this paper provides scientific basis for the enrichment of the oil forming theory during early evolutionarystage in terrestrial strata.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1997年第3期15-20,共6页
Petroleum Exploration and Development
关键词
准噶尔盆地
煤系
原油
生油层
芳香烃
地球化学
Zhungeer basin, Jurassic period, Coal measures, Lake environment, Crude oil, Source bed,Aromatichydrocarbon, Geochemistry, (Baijiahai convexity)
