Argon ion polishing/scanning electron microscope analyzing and sampling method for shale samples

Abstract

The invention discloses an argon ion polishing / scanning electron microscope analyzing and sampling method for shale samples including fragile shale core samples and rock debris samples. The method comprises steps of embedding, curing, cutting and polishing. By comparison with a traditional argon ion polishing / scanning electron microscope analyzing and sampling method, the analysis range of the samples is widened with the method, the shale core samples which are fragile in the cutting and sampling processes and the shale rock debris samples with smaller sizes can be analyzed, and meanwhile, the success rate of sampling is increased.

Description

technical field [0001] The invention relates to the field of petroleum geology, in particular to an argon ion polishing / scanning electron microscope sample preparation method for shale samples. Background technique [0002] Scanning electron microscopy is an important analysis and research tool in the petroleum geology industry. Combined with argon ion polishing technology, it can reveal the real microstructure inside shale, especially a large number of nanoscale to micron-scale pores. These pores are crucial for studying the occurrence state of shale gas and the later development process. Before performing argon ion polishing on the shale sample, the shale sample needs to be cut into a suitable size (generally 10mm×10mm×3mm), and then placed on the baffle and polished with argon ion beam, such as figure 1 shown. [0003] Therefore, the shale samples used for argon ion polishing / SEM analysis must meet a certain size, generally a core sample, and not easily broken during th...

AI Technical Summary

Problems solved by technology

However, due to the well-developed bedding or fractures of the shale core samples taken, they are easily broken during cutting due to the vibration of the cutting blade and the erosion of cooling water, and it is difficult to obtain a block sample with a suitable size for polishing; or the actual drilling process Coring operations were not performed in the shale, resulting in only small rock chip samples available for analysis, but it is difficult to cut them fixedly, so it is impossible to perform argon ion polishing / SEM analysis on the above-mentioned types of shale samples to obtain these samples. The formation microscopic information corresponding to the sample

Images