天然气地球科学 ›› 2021, Vol. 32 ›› Issue (7): 982992.doi: 10.11764/j.issn.1672-1926.2021.01.004
刘世明1(),谭富荣2(),唐书恒1,王金喜3,王伟超4,李永红4
Shi-ming LIU1(),Fu-rong TAN2(),Shu-heng TANG1,Jin-xi WANG3,Wei-chao WANG4,Yong-hong LI4
摘要:
泥页岩有机质碳含量(TOC)是页岩油气评价的重要参数之一。然而,受有机质热演化生排烃影响,利用现今TOC评价与预测页岩油气资源时会出现一定的偏差。因此,进行烃源岩原始有机碳恢复对油气资源评价具有重要意义。木里坳陷位于南祁连盆地东北部,陆相中侏罗统广泛分布。中侏罗统为一套湖泊—三角洲相沉积的细粒碎屑岩,发育多套厚层富有机质暗色泥页岩,生烃潜力巨大。该层段内油气资源丰富,页岩有机质从低成熟到高成熟阶段均有分布,为原始有机碳含量的恢复提供了必要条件。以木里坳陷中侏罗统富有机质页岩为研究对象,利用岩石热解数据,采用物质平衡法有机碳恢复模型,对中侏罗统页岩原始有机碳含量进行了恢复。结果表明,中侏罗统页岩原始TOC含量与现今TOC含量的比值介于1.04~1.62之间,且随着热演化程度增高,比值变大。现今TOC含量与有机质孔隙发育之间没有必然的联系,然而,原始TOC含量与现今TOC含量之间的比值可以间接判断页岩有机质微孔隙发育情况。木里坳陷侏罗系页岩有机质类型以Ⅱ型和Ⅲ型为主,热演化参数(Tmax)大于440 ℃时,烃类转化率和排烃率都大于40%。相比样品矿物(石英和黏土矿物)含量、Tmax参数和现今TOC含量,原始TOC含量与页岩兰氏体积拟合性更好,结合热解参数Tmax,可以更好地判断页岩油气的吸附能力。因此,开展木里坳陷中侏罗统烃源岩原始有机碳含量恢复的研究,可以为木里坳陷烃源岩评价提供理论基础;同时对木里坳陷油气资源勘探提供新的思路。
中图分类号:
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