Method and system for acquiring elasticity modulus of rock containing sedimentary rhythm layer

Abstract

The invention discloses a method and a system for acquiring the elasticity modulus of rock containing a sedimentary rhythm layer. The method comprises the following steps: acquiring a rock sample containing the sedimentary rhythm layer; measuring the rock element content of the rock sample at the test points by using a fluorescence spectrometer; wherein the test points are arranged on different rhythm layers of the rock sample; determining the lithology of the rock sample according to the rock element content; determining an element-mineral relation equation according to the lithology; determining mineral components of the rock sample by utilizing the lithology and the element-mineral relation equation; determining a mineral modulus coefficient according to the mineral components; and determining the elastic modulus of the rock sample according to the mineral components and the mineral modulus coefficient. According to the invention, nondestructive testing of mechanical properties of the rock sample can be realized.

Description

technical field [0001] The invention relates to the field of detection of mechanical properties of rocks, in particular to a method and system for obtaining elastic modulus of rocks containing sedimentary rhythmic layers. Background technique [0002] The elastic modulus (the ratio of the axial stress to the axial strain when the rock undergoes elastic deformation under compression, that is, the slope of the straight line section of the stress-strain curve) is a basic mechanical parameter that characterizes the ability of the rock to resist elastic deformation. The larger the amount, the smaller the deformation under a certain stress. For stone cultural relics, ascertaining the geomechanical properties of the cultural relics itself is the first prerequisite for the restoration of cultural relics. In unconventional oil and gas production, the elastic modulus is an important index to measure the degree of brittleness of rocks. Many scholars also directly incorporate it into t...

AI Technical Summary

Problems solved by technology

[0004] The traditional rock mechanics test technology needs to prepare a large enough and complete cylindrical rock sample. The sample has high requirements and needs to be finely processed, especially the end face of the sample needs to be ground. The processing process is time-consuming and costly. And the test process For destructive testing, the sample after the test is no longer complete, and it is inconvenient to carry out other analysis tests, while the geophysical logging needs to be carried out after the drilling is completed, which takes a long time and costs a lot

[0005] Because stone cultural relics are very precious, sampling is generally not allowed, and geophysical logging cannot be carried out; for rocks deep in the earth, due to their deep burial and difficult sampling, the number and size of available samples are very limited, and it is basically impossible to carry out standardization. It is difficult to carry out rock mechanics tests and geophysical logging in all wells; therefore, it is difficult to measure the elastic modulus of surrounding rocks of stone cultural relics and deep earth rocks by traditional methods, and it is urgent to propose a non-destructive and rapid The rock elastic modulus acquisition method, so that the mechanical properties of such rocks can be quickly predicted in the absence of standard test samples and logging data

Images