冀北坳陷龙潭沟中元古界下马岭组沥青砂岩烃类包裹体特征  

Characteristics of hydrocarbon inclusions in bituminous sandstone of Mesoproterozoic Xiamaling Formation at Longtangou paleo-oil accumulation of Jibei depression

作　　者：吴迪[1] 邱林飞[1] 尚长健[1] 黎琼[1] 

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《世界核地质科学》2015年第2期107-113,共7页World Nuclear Geoscience

摘　　要：以冀北坳陷龙潭沟古油藏中元古界下马岭组沥青砂岩为研究对象,在烃类包裹体显微岩相学研究的基础上,利用均一法、显微傅立叶红外光谱法等进行研究。研究发现该砂岩至少存在两期次的油气充注,早期油气充注时期为下马岭组成岩早期,该期次油气形成了古油藏,辉绿岩侵入体的烘烤作用对其造成破坏;晚期油气充注发生在成岩期后的燕山期,油气类型为成熟度高的中-轻质油气。冀北地区下马岭组中仍保存有游离的液态原油,具有良好的油气勘探前景。On the basis of hydrocarbon inclusions microscopic petrography, the bituminous sandstone in Mesoproterozoic Xiamaling formation at Longtangou paleo-oil accumulation of Jibei depression was studied by using homogenization method and Micro-FT.IR Spectrum method. The research indicates that there were two times of hydrocarbon entrapment at least. The first time was at the early stage of diagenesis of Xiamaling formation, oil accumulation forms but intrusive body of diabase destroyed it. The second time was in Yanshanian, the oil and gas types are medium-light oil with high maturation. Xiamaling formation in Jibei depression also preserves free hydrocarbon now, Jibei depression has a broad petroleum exploration prospect.

关 键 词：冀北坳陷 下马岭组沥青砂岩 烃类包裹体显微岩相学 成藏期次 油气类型 

分 类 号：P575.9[天文地球—矿物学]