岩性油气藏 ›› 2021, Vol. 33 ›› Issue (4): 4151.doi: 10.12108/yxyqc.20210405
尹兴平1, 蒋裕强1,2, 付永红1,2, 张雪梅3, 雷治安4, 陈超5, 张海杰4
YIN Xingping1, JIANG Yuqiang1,2, FU Yonghong1,2, ZHANG Xuemei3, LEI Zhian4, CHEN Chao5, ZHANG Haijie4
摘要: 渝西地区五峰组—龙马溪组龙一1亚段页岩具有巨大的勘探开发潜力,为了明确其不同岩相的储层品质差异、纵向分布规律及其储层发育影响因素等,结合岩石薄片鉴定、岩石组分、地球化学分析等进行了岩相划分,并综合有机碳含量、纹层结构、储集空间与物性、含气量等资料确定了不同岩相的储层特征、有利岩相分布及控制因素等。结果表明:研究层段发育高碳硅质页岩、中碳硅质页岩、低碳硅质页岩、低碳钙质-硅质页岩、低碳黏土质页岩、特低碳黏土质页岩6种岩相。高碳硅质页岩沉积环境还原性强,沉积水体深,生物繁盛,生物硅含量高,泥纹层发育,为优质页岩储层,有利于连片有机质和有机质孔的发育与保存,主要发育于龙马溪组底部1小层,为页岩气富集提供了有利生储条件;中碳硅质页岩与低碳硅质页岩沉积环境还原性较强,沉积水体变浅,生物繁盛程度降低,生物硅含量偏低,粉砂纹层和泥纹层频繁交互,有机质孔主要发育于分散状有机质中,是潜在的可开发页岩气储层,主要发育于五峰组顶部、龙马溪组2小层和3小层。该研究结果深化了研究区有利页岩储层纵向分布的认识,为页岩气立体开发提供了基础数据支撑。
中图分类号:
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