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- Title
川南威荣地区五峰组—龙马溪组深层页岩气微观储集空间发育特征及意义.
- Authors
熊亮; 杨振恒; 申宝剑; 卢龙飞; 魏力民; 王濡岳; 庞河清
- Abstract
Taking Well W, a typical coring well of Wufeng-Longmaxi formations in Weirong area, south Sichuan as the research object, based on core observation, thin section, argon ion polishing, scanning electron microscope, X-diffraction, organic geochemistry, tight physical properties and pore structure, the development characteristics and controlling factors of shale reservoir in the study area are discussed. The research shows that: (1) The shale of Wufeng-Longmaxi formations in Weirong area is mainly calcareous silicon rich carbonaceous shale, calciferous siliceous shale and calcium containing silicon rich carbonaceous shale. The organic matter type is type I, which is in the over mature stage. The black shale is characterized by medium to high organic carbon content, with an average clay mineral content of 40.0%, an average quartz content of 34.7% and an average carbonate mineral content of 18.2%. The mineral content of carbonate rock is relatively high. (2) The shale of Wufeng-Longmaxi formations in the study area is generally a low porosity and low permeability reservoir, mainly developing organic pores, interlayer pores (fractures) of clay minerals, inter-granular pores of pyrite, feldspar alteration pores (fractures) and grain edge fractures (pore) equal reservoir space. (3) The average value of micropores in Wufeng-Longmaxi formations is 0.009 73 mL/g, the average value of mesopores is 0.018 00 mL/g, and the average value of macropores is 0.003 77 mL/g. The reservoir space is mainly composed of micropores and mesopores. Organic matter is the main contributor to micropores, mesopores and specific surface area, and quartz minerals are the main contributor to macropores. Micropores and mesopores develop together, and they are specific surface area. Macropores are different from micropores and mesopores on the basis of development materials, and the contribution of macropore to relative surface area is limited. (4) From top to bottom, the proportion of organic pores increases gradually. At the bottom of Wufeng-Longmaxi formations, the proportion of organic pores can reach 76.73%, with an average of 55.73%. In the upper part of the sampling section, inorganic pores are relatively developed, accounting for an average of more than 80%. The main contributor of organic pores is organic matter, and the main contributor of inorganic pores is clay minerals. (5)Under the deep high temperature and high pressure conditions of Wufeng-Longmaxi formations in South Sichuan, it can develop and maintain organic rich shale reservoir and high-quality shale reservoir. The contribution of carbonate minerals to shale reservoir space is limited. Finding thick organic rich shale will still be the key to shale gas dessert.
- Subjects
SICHUAN Sheng (China); CARBONATE minerals; BLACK shales; POROSITY; CARBONATE rocks; OIL shales; GOLD ores; CARBONATES; SHALE oils
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 6, p860
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2022.01.018