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- Title
渝西地区页岩储层微观孔隙结构对页岩气赋存影响.
- Authors
李维; 张海杰; 罗彤彤; 吴伟; 蒋琳; 钟铮; 蒋裕强; 付永红; 蔡光银
- Abstract
The special mineral composition and complex pore structure of shale reservoir make the occurrence mechanism of shale gas in pore fracture system diverse. An in-depth understanding of the occurrence state of shale gas in the micro pore fracture system is helpful to reveal the occurrence mechanism of shale gas, enrich the enrichment theory of shale gas and optimize the development process of shale gas. Focusing on the micro pore structure and shale gas storage mechanism of L11 sublayer shale reservoir in western Chongqing, this paper carried out argon ion polishing scanning electron microscope, nuclear magnetic resonance, nuclear magnetic freeze-thaw and methane adsorption nuclear magnetic resonance experiments of plunger like shale samples under different water (oil) states, focusing on the characteristics of micro pore structure and its influence on shale gas storage. It is concluded that the adsorbed gas is mainly controlled by oil wetted pores less than 5 nm, and the analytical ratio is about 45.81%; Free gas is mainly controlled by pores and microcracks with pore diameter greater than 110 nm, and the analytical ratio is about 89.60%; 5-110 nm organic pores and inorganic pores are important storage spaces for adsorbed gas and free gas, which can realize the effective transformation of adsorbed gas and free gas, and the resolution ratio is about 78.81%. They are the main source of formation energy during mining. For shale gas wells with more developed organic pores at 5-110 nm, the initial production is not high, but it is longer than stable production, and the cumulative production in the same time is higher, which effectively explains the reasons for the production difference between shale gas wells.
- Subjects
CHONGQING (China); SHALE gas; OIL shales; NUCLEAR magnetic resonance; POROSITY; SCANNING electron microscopes; GAS wells
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 6, p873
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.12.004