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- Title
北部湾盆地涠西南凹陷古近系流三段成岩作用 及对储层物性影响.
- Authors
谢宁; 操应长; 王健; 金杰华; 张文杰; 钟泽红
- Abstract
Based on the core observation,thin sections identification,geophysical property,scanning electron microscope,cathodoluminescence tests,diagenesis and its control on physical property of the reservoirs in the 3rd member of the Liushagang Formation(El3)in the Weixinnan Depression were analyzed by using the method of qualitative description and quantitative characterization. The research shows that the physical properties of reservoirs in study zone can be summarized as medium-low porosity and heterogeneous permeability,and the diagenetic environment of reservoir has changed from weak alkaline,acidic,alkaline to weak acidic conditions. The compaction intensity is mainly moderate-strong,and the cementation intensity is mainly moderate-weak. The compaction,which is mainly controlled by the buried depth,is the main mechanism of pore reduction in the reservoirs. The dissolution intensity is moderate,so as to improve the reservoir physical properties. When the thickness ratio of sand to mud is greater than one,the carbonate cementation and dissolution are affected by the distance to the interface of sand and mudstone. With the decrease of distance,the carbonate cementation intension enhances,the dissolution intension weakens,so the favorable reservoirs may develop in the middle of thick sandstone bodies. The structural fractures caused by the major activities can be the main migration channel of the fluid medium. The reservoirs which closing to large faults or secondary faults may cause strong corrosion.
- Subjects
RESERVOIRS; COMPACTING; SANDSTONE; MUD; POROSITY; CATHODOLUMINESCENCE; PETROPHYSICS
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 12, p1743
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.07.015