天然气地球科学 ›› 2019, Vol. 30 ›› Issue (12): 17821793.doi: 10.11764/j.issn.1672-1926.2019.09.009
• 非常规天然气 • 上一篇
曹香妮1,2(),姜振学1,2(
),朱德宇1,2,仇恒远1,2,陈磊1,2,罗东东1,2,双子俊1,2,李维邦1,2
Xiang-ni Cao1,2(),Zhen-xue Jiang1,2(
),De-yu Zhu1,2,Heng-yuan Qiu1,2,Lei Chen1,2,Dong-dong Luo1,2,Zi-jun Shuang1,2,Wei-bang Li1,2
摘要:
中国陆相页岩气资源潜力巨大,其中川东北部分地区下侏罗统获得了工业性页岩气流。开展页岩岩相划分与储层特征的研究有利于进一步勘探开发陆相页岩气。通过XRD、普通薄片、扫描电镜、高压压汞、N2吸附及CO2吸附等实验方法对川东北地区自流井组陆相页岩进行精细研究。以有机质丰度及矿物组成为分类参数将页岩分为12种不同岩相,查明了自流井组页岩主要发育4种岩相,即贫有机质硅质页岩(Ⅰ3)、含有机质混合质页岩(Ⅳ2)、含有机质硅质页岩(Ⅰ2)与富有机质黏土质页岩(Ⅱ1)。不同岩相的页岩储层特征存在较大差异,富有机质黏土质页岩有机质含量大于2%,生烃潜力最好,有机质孔及黏土矿物晶间孔之间连通性较好且比表面积较大,发育的纹层状构造有利于工业压裂,为最优陆相页岩岩相,是最有利的陆相页岩气勘探开发目标;含有机质混合质页岩(Ⅳ2)有机质含量大于1%,孔体积较高,储气能力较好,且发育有利于压裂的层状构造,为良好陆相页岩岩相,是较有利的勘探开发目标;而贫有机质硅质页岩(Ⅰ3)与含有机质硅质页岩(Ⅰ2)则具块状特征,孔体积与比表面积均较低,为较差陆相页岩岩相,是最不利的勘探开发目标。
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