潜江凹陷潜三段盐间页岩油特征及油源研究

摘要

Aimed at the characteristics of inter-salt shale oil and oil source problems in Eq3 of Qianjiang depression in Jianghan basin,using 13 wells crude oil,hydrocarbon source rock sample′s composition,saturated hydrocarbon chromatogram,saturated hydrocarbon chromatography mass spectrometry and other data,detailed elaborated the physical and geochemical characteristics of crude oil.On the basis of this,oil and rock deposition environment,parent material characteristics and maturity were compared.The studied results revealed that crude oil is alkanes that have obvious even carbon advantages,and isoalkane is characterized by isoparaffin phytane advantage,andγwax alkane content is particularly high.Potential in Wangchang area of Qianjiang depression between the Eq3 of inter-salt shale oil parent material is a single type,mainly algae,formed in the strong reduction,high salinty of the gypsum deposit environment,and is low mature-mature crude oil;oil source correlation results show that the Eq3 of the oil source of crude oil mainly from Eq3,but there may be hidden into Eq4 of oil.Research results of latent in Qianjiang depression between the Eq3 of inter-salt shale oil exploration and development has important reference value,and have a reference on the same type shale reservoir exploration and development at home and abroad.%针对江汉盆地潜江凹陷潜三段盐间页岩油特征及油源问题,采用13口油井原油、烃源岩样品的族组分、饱和烃色谱、饱和烃色谱质谱等资料,详细阐述了原油的物理及地球化学特征.在此基础上,从油、岩的沉积环境、母质特征、成熟度等方面进行了油源对比.研究表明:原油正构烷烃具有明显的偶碳优势,异构烷烃则表现为植烷优势,γ蜡烷含量特高;原油母质以藻类为主,形成环境为强还原、高盐度的膏盐沉积环境,成熟度为低熟-成熟;潜三段原油的油源主要来自潜三段烃源岩,但可能有潜四段生成的油渗入.研究成果对潜江凹陷潜三段盐间页岩油勘探开发具有重要参考价值,并对国内外同类型页岩油藏勘探开发具有借鉴作用.