北京大学学报（自然科学版）2018，Vol.54Issue(2)：373-384,12.DOI:10.13209/j.0479-8023.2017.135
塔里木盆地玉北地区中-下奥陶统碳酸盐岩成岩作用类型及演化
Diagenesis Types and Evolution of the Lower-Middle Ordovician Carbonates in Yubei Area, Tarim Basin
摘要
Abstract
The Lower-Middle Ordovician carbonate rocks are studied by core observation, thin section observa-tion, geochemical analysis to restore the diagenetic evolution history of the Yubei area, Tarim Basin. Dissolution, dolomitization, silicification and cataclasis are studied and the diagenetic evolution history is divided into four stages. The grained texture dominated limestone in the relative geomorphic high location exposes to the ground and undergoes penecontemporaneous dissolution due to the fluctuation of the sea level. Caves and pores with structural selectivity parallel to the sedimentary bed are generated by the penecontemporaneous dissolution. The dolomiti-zation developed mainly in early diagenetic stage enhances the resistance of carbonates to compaction and pressure solution, which benefits the preservation of early pores and caves. The fractures formed during the Middle-Late Caledonian and Early Hercynian in this stage are mostly closed and filled due to complicated compaction and cementation. Hydrothermal activity in middle diagenetic stage damages the reservoir slightly by the presence of pyrite and dolomite with wavy extinction and saddle structure in the reservoir space. The late diagenetic stage is characterized by the silica and calcareous fluid activity, which fill the early space partially. The development degree of fractures formed during Late Hercynian and Himalayan epoch is weaker than early diagenetic stage. However, the fractures formed during late diagenetic stage keep open due to weak diagenetic transformation and become efficient migration channel and reservoir spaces in Yubei area.关键词
玉北地区/中‒下奥陶统/碳酸盐岩/成岩序列/孔隙Key words
Yubei area/Lower-Middle Ordovician/carbonate/diagenetic sequence/pore分类
天文与地球科学引用本文复制引用
刘红光,刘波,张学丰,曹鉴华,黄臣军,刘格云,吴双林..塔里木盆地玉北地区中-下奥陶统碳酸盐岩成岩作用类型及演化[J].北京大学学报（自然科学版）,2018,54(2):373-384,12.基金项目
国家自然科学基金(41572117)、中国石油化工股份有限公司科技开发部项目(P14128,P16112)和中国地质调查局项目(DD20160175-1-1)资助 （41572117）
