The relationship between dolomitization and organic matter occurrence in Lower Paleozoic carbonate in the Ordos Basin

作     者：Rongfen Jia Dehan Liu 

作者机构：Chinese Acad Sci Inst Geochem Guangzhou 510640 Peoples R China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2000年第45卷第S1期

页      面：41-46,115页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

主　　题：Ordos Basin marine carbonate organic matter dolomitization large-medium-sized gas field 

摘      要：Based on observations on the core and surface sections of Lower Paleozoic carbonate in the Ordos Basin, petrography research and measurements of TOC, TOS , Ro , XRD, and comparative study with dolomite in modern Coorong Lake, it has been revealed that: ( i ) dolomitization may occur in micrite limestone, gypsum-halite and argillaceous sandstone, and it can be divided into three types: sedimentary penecontemporaneous-early diagenesis, late diagenesis of deep burial and catagenesis of uplift period. However, the crystal cell of the second type less than 35μm in size is most closely associated with gas pool; (ii) the highest content of organic matter (OM) is produced in samples from the argillic dolomite which may be formed by argillaceous fluid through gypsum-halite; (iii) in the evolution process from penecontemporaneous dolomite into stoichiometric dolomite, the crystal order of dolomite and the porosity of its host rock tend to increase, which is favorable to the formation of an available migration