天然气地球科学 ›› 2019, Vol. 30 ›› Issue (10): 13931405.doi: 10.11764/j.issn.1672-1926.2019.07.018
• 非常规天然气 • 下一篇
梁兴1(),陈科洛2(),张廷山2,张朝1,张介辉1,舒红林1
Xing Liang1(),Ke-luo Chen2(),Ting-shan Zhang2,Zhao Zhang1,Jie-hui Zhang1,Hong-lin Shu1
摘要:
基于元素地球化学示踪、扫描电镜和低温氮气吸附实验,对滇黔北地区五峰组下段、观音桥段和龙马溪组下段3个层位沉积环境和孔隙特征进行分析,并进一步探讨不同沉积环境对页岩孔隙的控制作用。V/(V+Ni)、V/Cr、Ni/Co、U/Th、生源Ba含量、Mn/Fe、Sr/Ba指标指示:五峰组下段和龙马溪组下段沉积期处于厌氧条件、古生产力较高、古水深较深;观音桥段沉积期处于富氧环境、古生产力较低、古水深较浅。扫描电镜分析发现:五峰组下段和龙马溪组下段孔隙类型以黏土矿物层间孔和有机质孔为主,观音桥段孔隙类型以原生粒间孔和粒间溶孔为主。低温氮气吸附实验指示:五峰组下段和龙马溪组下段孔隙比表面积较大,孔体积和平均孔径较小,几何形态主要为槽状孔和微孔;观音桥段孔隙比表面积较小,孔体积和平均孔径较大,几何形态主要为墨水瓶孔。五峰组下段和龙马溪组下段沉积期厌氧环境和较高的生产力为有机质孔的发育提供了有利条件,而伊利石和伊/蒙混层的层状结构是黏土矿物层间孔发育的主要因素。观音桥段矿物颗粒的大小混杂堆积和后期的溶蚀改造分别形成了原生粒间孔和粒间溶孔,同时也是二者与墨水瓶孔具有良好对应关系的原因。
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