天然气地球科学 ›› 2019, Vol. 30 ›› Issue (1): 7482.doi: 10.11764/j.issn.1672-1926.2018.11.007
张道锋,姚泾利,高星,席明利,赵会涛,闫小雄,付勋勋
Zhang Dao-feng,Yao Jing-li,Gao Xing,Xi Ming-li,Zhao Hui-tao,Yan Xiao-xiong,Fu Xun-xun
摘要: 以白云岩岩石结构分析为基础,结合白云岩碳氧同位素、锶同位素、有序度等地球化学测试资料,对鄂尔多斯盆地奥陶系马五5亚段白云岩形成机理进行了探讨。研究表明,马五5亚段具有储集意义的白云岩为粉晶白云岩和泥粉晶白云岩,其中泥粉晶白云岩有序度为0.71,阴极发光表现为不发光,δ13C值为-0.10‰,δ18O值为-6.30‰;粉晶白云岩阴极发光以暗红色为主,有序度为0.85,δ13C值为-0.68‰,δ18O值为-6.58‰。泥粉晶白云岩和粉晶白云岩的碳氧同位素值与全球中奥陶世海水值大体相当,反映了白云岩化作用流体与同期海水有关,具有渗透回流白云岩化作用特征。结合古地理背景,建立了渗透回流白云岩化作用模式,指出马五5亚段沉积期古气候干燥、炎热,同生期具备形成富镁卤水的能力,是马五5亚段白云岩形成的关键,同生期白云岩化作用奠定了白云岩的展布格局,为浅埋藏期富镁卤水提供有效的下渗通道,同时有利于埋藏期孔隙的保存。马五5亚段白云岩在空间上有序分布,靠近古隆起区以整段白云岩为主,榆林—神木地区受伊盟古陆南斜坡影响,以中上段白云岩为主,靖边—安塞地区以中段白云岩为主,这些白云岩段是有利的勘探目标。
中图分类号:
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