天然气地球科学 ›› 2021, Vol. 32 ›› Issue (2): 174190.doi: 10.11764/j.issn.1672-1926.2020.09.009
何燚1(),唐玄1(),单衍胜2(),刘光祥3,谢皇长1,马子杰1
Yi HE1(),Xuan TANG1(),Yan-sheng SHAN2(),Guang-xiang LIU3,Huang-chang XIE1,Zi-jie MA1
摘要:
海陆过渡相页岩类型多、有机质类型复杂,既不完全同于陆相也不完全同于海相页岩特征,探讨海陆过渡相页岩岩相及其特征是进一步认识页岩气储集空间、赋存机理和富集规律的基础和前提。以四川盆地及其周缘典型地区二叠系龙潭组海相M1井和陆相DC1井页岩为研究对象,结合岩心观察、普通光学薄片观察、氩离子抛光扫描电镜观察等实验手段,对页岩岩相进行划分对比并描述其特征。结果表明:四川盆地及其周缘典型地区龙潭组页岩岩相按照矿物含量可划分为5个大类,分别为黏土质页岩相、钙质页岩相、硅质页岩相、钙质混合页岩相和硅质混合页岩相。根据有机质丰度进一步划分出8个小类,分别为特高有机质硅质页岩相、特高有机质硅质混合页岩相、特高有机质黏土质页岩相、高有机质硅质页岩相、高有机质黏土质页岩相、中有机质钙质混合页岩相、中有机质黏土质页岩相和低有机质钙质页岩相。其中黏土质页岩相、硅质页岩相和硅质混合页岩相有机质丰度高为有利产层;钙质和钙质混合页岩相有机质丰度低为不利产层;黏土质页岩相是页岩岩相中最为普遍发育的岩相;海陆过渡相的黏土质页岩相页岩有机质丰度高于海相的黏土质页岩相页岩。
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