论文部分内容阅读
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。
The Cainan oil field located on the Baijian sea uplift in the east Junggar Basin has the same origin of geochemical characteristics of aromatics as the crude oil in Fukang Sag and is closely related to the source rocks of the Middle and Lower Jurassic lacustrine facies. The fluorene content in crude oil and source rock is relatively high (35% -55%), fluorene (25% -45%) and sulfur fluorene is low (6% -35%), hydrocarbon. The content of phenanthrene and phenanthrene in the aromatics fraction is the highest, with an average of 32.45% for crude oil and 30.08% for source rock, 22.16% for naphthalene series and 22.25% for source rock. The DBT / P value of Baijiahai crude oil is lower than that of marine crude oil, Pr / Ph value is higher than that of marine crude oil, and the oil source comes from lacustrine freshwater sediment. Studies have shown that the higher the dibenzothiophene compound, the lower the content of bacterial solution amorphous body. The Baijihai salient lacustrine source rock is less than 8.5% dibenzothiophene, creating a good habitat for microbial activity and activity, which is conducive to bacterial degradation of organic matter and lipid enrichment. From the methylphenanthroline parameter, the evolution of hydrocarbon source rocks is relatively low, which is close to the measured Ro value (0.53% -0.64%), and low-mature oil. In Junggar and other basins, looking for low-mature reservoirs from Jurassic lacustrine source rocks has great potential and provides an important basis for enriching and developing the theory of early oil generation in the continental frontier.