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- Title
四川盆地五峰组—龙马溪组页岩储层中碳酸盐 矿物特征、形成机制及对储层物性影响 .
- Authors
周晓峰; 李熙喆; 郭 伟; 张晓伟; 梁萍萍; 于均民
- Abstract
By electron probe microscope with spectrometer and energy spectrometer, combined with physical properties and whole rock X-diffraction and organic carbon data, characteristics, formation mechanism and influence on physical properties of carbonate minerals in shale reservoir of Wufeng-Longmaxi formations in Sichuan Basin are systematically studied. And the following research results were obtained. Firstly, carbonate minerals mainly include calcite, dolomite and ferriferous dolomite, and the calcite exists between mineral particles and fills the cavity of radiolarian siliceous shell in the form of the single mineral, and the structure that the ferriferous dolomite always rings the dolomite is among mineral particles in the form of the single mineral and aggregates. Secondly, the calcite is produced by microorganisms secreting calcium carbonate in the surface of seawater and precipitated in both seawater and the cavity of radiolarian siliceous skeleton, and after dissolving partly while settling in seawater the residual calcite deposits on the seabed and is preserved by burial. Thirdly, the dolomite is a diagenetic mineral formed on the water-sediment interface with physiological activities of sulfate bacteria, and the ferriferous dolomite is produced by methanogenic metabolism during the initial burial of muddy sediments. Fourthly, organic carbon, pyrite, quartz and clay minerals are closely related to reservoir physical properties, while carbonate has no effect on porosity and permeability as a whole. The in-situ detection, element area scanning and especially spectrogram from electron probe microscope technology provide typical petrological evidences for the study of characteristics, formation mechanism and influence on physical properties of carbonate minerals in shale reservoirs, which should be popularized in the study of shale reservoir diagenesis in the future.
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 5, p775
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.11.012