天然气地球科学 ›› 2020, Vol. 31 ›› Issue (7): 915922.doi: 10.11764/j.issn.1672-1926.2020.03.005
曹自成1(),尤东华2,漆立新1,云露1,胡文瑄3,李宗杰1,钱一雄2,刘永立1
Zi-cheng CAO1(),Dong-hua YOU2,Li-xin QI1,Lu YUN1,Wen-xuan HU3,Zong-jie LI1,Yi-xiong QIAN2,Yong-li LIU1
摘要:
塔里木盆地超深层钻井塔深1井揭示在埋深8 408 m条件下依然具有优质白云岩储层,但储集空间的成因机制存在较大争议。在详细的岩心描述、显微岩石学观察与孔洞胶结物充填序列分析基础上,对阴极发光分析后的加厚薄片,通过原位微区取样方法分别获取基质、早期白云石胶结物和晚期白云石胶结物样品并进行碳氧同位素分析。早期白云石胶结物与白云岩基质具有相对一致的碳氧同位素分布特征,而晚期白云石胶结物δ13C值和δ18O值偏负。胶结物充填序列与碳氧同位素分析结果表明,不同类型白云石是多阶段白云石化作用的产物,即孔洞在白云石化作用发生的时候已经形成并随着埋深增加不断消亡。中寒武统阿瓦塔格组深灰色孔洞型白云岩储集空间的形成可能与准同生期近地表成岩事件有关。
中图分类号:
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