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- Title
上扬子区龙马溪组页岩中黄铁矿成因.
- Authors
韩盛博; 李伍
- Abstract
As a characteristic mineral of shale,pyrite is of great significance. The microcrystalline of strawberry pyrite aggregates is limited to the surrounding environment during the growth process,so it can be used as an indicator to evaluate the sedimentary environment. Therefore,strawberry pyrite is important to restitute palaeomarine sedimentary water facies. Based on argon ion polishing- scanning electron microscopy imaging of pyrite samples in the shale of Longmaxi Formation in the Upper Yangtze region,the particle size and micrograin size of the strawberry pyrite in the image are measured. Combined with the organic matter content and sulfur content in the Longmaxi Formation shale,a comprehensive analysis of the genesis and formation environment of pyrite is carried out,and the following conclusions are drawn:(1)The average particle size,maximum particle size (MFD)of the strawberry-like pyrite and the ratio of the average particle size of the aggregate to the average particle size of the microcrystals were both small in the study area,and the sedimentary environment is occluded and reduced. The crystallite size of the strawberry pyrite has an indication of the redox state of the sedimentary environment significance.(2)Strawberry-like pyrite is formed in the syngenetic-quasi-probiotic stage;the simple cause of self-crystallized pyrite is formed in the same sedimentary period,and the complex origin pyrite is formed in the diagenetic period.(3)The pore type in the Longmaxi Formation shale is developed. There are a large number of intercrystalline organic pores and mold pores around the pyrite. The pyrite content helps to im prove the reservoir pores. Pyrite in deep-water continental shelf shale is closely related to organic matter and has a positive impact on shale gas accumulation and development.
- Subjects
SHALE gas; STRAWBERRIES; CONTINENTAL shelf; SCANNING electron microscopy; PARTICLE size determination; PYRITES; ORGANIC compounds
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 11, p1608
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.03.002