南京大学学报(自然科学版) ›› 2020, Vol. 56 ›› Issue (3): 308321.doi: 10.13232/j.cnki.jnju.2020.03.002
游杰1,2,胡广1,2(),张玺华3,沈安江4,5,彭瀚霖3,田兴旺3,赵东方1,2
Jie You1,2,Guang Hu1,2(),Xihua Zhang3,Anjiang Shen4,5,Hanlin Peng3,Xingwang Tian3,Dongfang Zhao1,2
摘要:
微生物碳酸盐岩中有机质在同生?早成岩阶段的降解既可以产生酸性流体对碳酸盐颗粒进行溶解,扩大后期成储流体通道,有利于储层发育;但也可能导致孔隙水处在碱性环境下,形成碳酸盐矿物胶结,阻碍溶蚀流体对储层的改造.因此,同生?早成岩期有机质降解对微生物岩储层储集空间的形成有重要影响,但研究薄弱.以四川盆地北部地区上震旦统灯影组四段(灯四段)微生物碳酸盐岩为例,综合岩石学和原位微区地球化学分析(LA?ICP?MS),开展了这一降解过程的地球化学示踪研究.结果显示,当微生物碳酸盐岩中的有机质处于有氧降解时,微亮晶和亮晶组构均具有Ce负异常;当亮晶组构Ce元素转变为正异常时,表明有机质进入厌氧降解阶段.此外,微生物岩亮晶组构中Cr含量高于微亮晶组构,可以作为有机质降解经过了硝酸盐还原过程的识别标志.如果有机质被Fe?Mn氧化物氧化降解,则会造成微生物岩微亮晶组构中Fe含量高于亮晶组构.随着成岩环境的还原状态进一步加强,有机质降解进入硫酸盐还原阶段,将导致微生物岩中亮晶组构相对于微亮晶组构富集Cu,Mo元素.因此,Ce,Cr,Fe,Mo,Cu等元素在微生物岩不同岩石组构中的变化可以有效识别微生物岩同生?早成岩阶段有机质降解的成岩环境并示踪有机质降解过程.
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