Measuring method of roundness of gravel based on core image

Abstract

The invention discloses a gravel psephicity measuring method based on rock core image, and relates to a gravel psephicity measuring method. The method comprises the steps: a plurality of rock core samples are selected form an exploratory well which serves as a research object, and a rock core image library is established according to acquired rock core sample images; the images in the rock core image library are imported to a professional drawing software, and a gravel particle contour of each image is extracted by using the professional drawing software; the images comprising gravel particle contours are imported to an IPP6.0 software, and geological parameters of each gravel in each rock core sample are measured and selected through the IPP6.0 software; and according to the collected geological parameters and a psephicity calculation fomula, psephicity of each gravel in each rock core sample is calculated. According to the invention, the accuracy of psephicity measurement is greatly improved, the depositional characteristics of gravel in real stratum can be reflected, and the reliable evidences are provided for an exploratory area which has similar depositional characteristics.

Description

technical field [0001] The invention belongs to the technical field of geological exploration, and relates to a method for measuring the roundness of gravel, in particular to a method for measuring the roundness of gravel based on a core image. Background technique [0002] The roundness of the gravel is one of the important parameters to measure the shape of the gravel, which indicates the degree to which the original edges and corners of the gravel are rounded. The roundness of gravel can reflect the characteristics of gravel transportation process, deposition process, provenance properties, etc. [0003] The existing gravel roundness measurement mainly relies on the visual estimation and comparison method (referred to as the visual estimation method). types, such as extremely round, round, subround, subangular, and angular (Wadell, 1932). [0004] The visual estimation method is usually used in the description of cores, and is greatly influenced by subjective factors. T...

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Problems solved by technology

[0005] Although the visual estimation method can only achieve qualitative measurement, not quantitative measurement, and the quantitative measurement of roundness is conducive to improving the measurement accuracy during geological exploration and reducing the labor intensity of geologists, the visual estimation method is still a part of today's measurement. The mainstream method of roundness, people's enthusiasm for quantitative research on the roundness of gravel is still not high

[0006] The reasons why the visual estimation method is still the mainstream method of measuring roundness today are as follows: 1. Now people generally believe that roundness is a qualitative parameter, and the quantitative value of roundness is not of much value, and the geological significance is not obvious; 2. Due to The existing roundness calculation formula was proposed in the early to mid-20th century, so it was limited by the experimental conditions at that time. When using the existing roundness calculation formula, the measurement process is cumbersome, and the existing grinding There are prone to errors between the calculation results obtained by the roundness calculation formula and the real geological environment

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