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- Title
基于有机孔和生物成因硅优选页岩气富集高产 层段的方法及应用 ——以四川盆地及其周缘五峰组—龙马溪组页岩为例.
- Authors
张光荣; 聂海宽; 唐玄; 李东晖; 孙川翔; 张培先
- Abstract
At present, the method of organic carbon and silicon content is often used to optimize shale gas enrichment and high-yield intervals. However, when selecting layers according to organic carbon content, the differences of different types of organic matter and their controlled organic pores are usually ignored, while the consideration of biogenic silica content is ignored when selecting layers according to silica content. Organic pores deter⁃ mine shale gas reservoir capacity, and biogenic silica determines formation ability of shale high-quality reservoirs. In this paper, an optimization method of shale gas enrichment and high production interval based on organic pore and biogenic silica content is proposed. Based on the porosity of different types of organic matter and the composition of organic matter types, the calculation method of organic pore proportion of different hydrocarbon generating organisms is proposed, and the calculation method of shale biogenic silica content is proposed based on the silica content and logging parameters in shale. Through field application analysis, it is found that under the dual constraints of organic pore ratio of more than 3% and biogenic silica content of more than 30%(i.e. "3+ 30" method for optimization of shale gas enrichment and high-yield interval based on organic pore and biogenic silica), the optimized shale interval from Wufeng Formation to Longmaxi Formation has good consistency with the current shale gas high-yield interval. This method realizes the organic unity of evaluation of the reservoir capacity and the transformation ability of shale gas enrichment and high-yield layers, and has certain application value in the optimization of favorable intervals and shale gas reserves prediction.
- Subjects
SICHUAN Sheng (China); SHALE gas reservoirs; SHALE gas; OIL shales; NATURAL gas reserves; ORGANIC compounds
- Publication
Natural Gas Geoscience, 2021, Vol 32, Issue 6, p888
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.01.009