四川盆地东南部南川地区五峰组—龙马溪组页岩特征
Journal of Chengdu University of Technology (Science and Technology Edition)(2013)
Abstract
通过野外地质调查及样品的实验分析,研究了四川盆地东南部南川地区五蜂组-龙马溪组页岩沉积相特征、有机地球化学特征、储层特征等.五峰组下段至上段由深水陆棚相过渡到浅水陆棚相,龙马溪组下段与上段同样表现为由深水陆棚相过渡到浅水陆棚相.页岩有机质类型主要为Ⅱ1型和Ⅱ2型,总有机碳含量(质量分数)介于0.22%~4.59%,热演化程度已达过成熟-高成熟阶段,R.介于1.99%~2.74%.页岩中矿物组成主要以脆性矿物石英为主,黏土矿物次之.扫描电镜结果显示南川地区页岩发育了大量微孔隙,其中以溶蚀孔与有机质微孔居多,为页岩气的储集提供了空间.
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Key words
Micropore,Nanchuan area,Organic geochemistry,Sedimentary facies,Shale gas,Wufeng formation and longmaxi formation
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