Molding Method for Microscopic Pores of Carbonate Rock Cuttings

Abstract

The invention belongs to the technical field of rock-mineral determination and rock physics, and particularly relates to a making method for carrying out micro-pore casting on millimeter-level carbonate-rock well-drilling rock debris and a making method of a rock debris slice. The making method includes the following steps of 1, rock debris sampling; 2, sample isolating, filling and numbering; 3, rock debris gluing and pore casting; 4, cast sample separating and number repeating; 5, cast sample slice making. By means of the making method, the gluing-casting integrated technology of millimeter-level rock-debris samples is achieved, 20-30 sets of rock debris samples can be subjected to gluing-casting integrated treatment at the same time, the samples are made into a plurality of special rock debris slices capable of being directly used for the rock microstructure and micro-pore observation and analysis, the slice making time and the slice making cost are saved, and microscopic data for micro-pore observation and cause analysis can be provided for non-cored intervals in the drilling process.

Description

technical field [0001] The invention belongs to the technical fields of rock ore identification and petrophysical research, and in particular relates to a method for making a carbonate rock chip microscopic pore casting mold and a casting body thin section. Background technique [0002] Worldwide, there are abundant oil and natural gas resources in carbonate formations, and considerable natural gas reserves have also been found in carbonate formations in the three major basins in my country. Therefore, comprehensive geological research on carbonate rocks is extremely important . At present, the analysis of cast thin sections under a microscope is the most commonly used and most important technical means in the study of carbonate rocks. It can not only identify the rock composition of carbonate rocks, but also analyze the rock pore structure. [0003] However, the current conventional casting thin section production technology can only be produced for large rock samples (≥2cm...

AI Technical Summary

Problems solved by technology

[0003] However, the current conventional casting thin section production technology can only be produced for large rock samples (≥2cm×2cm×0.3cm), and such samples can only be obtained by drilling cores (or field samples)

Due to the high cost of drilling and coring, generally only a few local intervals are targeted, so there are few rock samples obtained from coring, and the geological data obtained from thin sections of cast bodies are correspondingly few and unsystematic, which brings great impact to geological research. Difficulties

[0004] The authorized announcement number is CN101441147 patent "a method for making thin slices of rock voids". This method is to simultaneously make casts for multiple large rock samples (≥2cm×2cm×0.3cm). As far as the production process is concerned, the efficiency of casting production is relatively improved, but there are also shortcomings: 1. The sample must be rock, which is not suitable for cuttings samples, which has strong limitations; 2. The rock required for thin section production is for drilling As a result, systematic thin-section production will inevitably require coring from the entire well section, which will lead to high drilling costs and affect the drilling speed

However, there is a problem that it is difficult to make casting thin slices for microscopic observation of rock pores by conventional methods.

This method also has shortcomings: 1. It can only make ordinary cuttings bonded thin slices, not cast thin slices, which cannot reflect the microscopic pore structure of rocks; 2. It cannot realize simultaneous preparation of multiple samples