Dolomitization of Ordovician Majiagou Formation in Sulige Region, Ordos Basin
详细信息
- 责任者：Fu Jinhua (Research Institute of Petroleum Exploration and Development ; Changqing Oil Field ; PetroChina ; Xi’an 710018 ; China) ; Wang Baoqing
- 刊名：Petroleum Geology & Experiment
- 出版年：2011
- 卷期：33(3)
- 关键词：白云石化 ; dolomitization ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.266-273
- 图表：3 illus., 1 plate, 3 tables, 26 refs.
- 分类号：0803
- 出版序号：870
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
The Ordovician Majiagou Formation in Sulige region of the Ordos Basin was deposited in hypersaline restricted epicontinental environment. It is mainly composed of carbonate rocks with thin evaporate interbeds. The dolomites are characterized with varied Na, low Sr and Mn, and high Fe concentrations. The 18O values for dolomites range from -16.00‰ to -5.73‰, and the 13C values range from -11.46‰ to 1.90‰ (PDB). It indicates that carbonate rocks have experienced leaching and burial diagenesis.Most filled dolomites have lower 18O and 13C values than surrounding components, indicating that the former was formed later. The dolomites are characterized with low degrees of order and less stoichiometry. Microbial dolomitization is the reason for dolomite genesis.
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