Method for estimating coal, rock mass physical mechanics parameter through seismic wave velocity

Abstract

The invention provides a theoretical model and a test model for compressional wave velocity and shear wave velocity convention and a test model for wave velocity and density conversion based on elastic wave propagation theory and basic parameters including the compressional wave velocity, the shear wave velocity and density through theoretical analysis and experimental study to quantitatively describe basic physical parameters and models of coal-measure sedimentary rocks. The invention constructs correlation between dynamic elasticity mechanics parameters and static elasticity mechanics parameters of coal-measure sedimentary rocks and between physical mechanics parameters and acoustic velocity of coal-measure rocks and models thereof based on acoustic velocity experiment and three parameters of rocks including the compressional wave velocity, the shear wave velocity and the density, by measurement of static mechanics parameters of coal-measure rocks and statistics and regression analysis of test data. The invention further provides a method for obtaining seismic wave interval velocity parameter by interval velocity inversion of wave impedance, develops rock physical mechanics parameter analytical software based on seismic information and realizes in situ physical mechanics parameter calculation of coal and rocks.

Description

technical field [0001] In coalfield seismic exploration, in addition to finding out the structure and coal seam distribution in the mining area, it is also necessary to invert the lithology and its mechanical parameters. These have become the topics that many scholars at home and abroad are concerned about. The analysis of the physical and mechanical parameters of the coal seam and its top and bottom pole rock mass is currently mainly in the stage of laboratory experimental research. How to extract more geological information from seismic information to realize the prediction of the physical and mechanical parameters of the coal seam and its top and bottom rock mass. For coal mining roadways Support design, coal and gas outburst and underground water inrush risk prediction and evaluation have important theoretical and practical significance. Background technique [0002] 3D seismic prospecting is a method or technology for inversion of geological bodies by using the change o...

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Problems solved by technology

However, previous studies were limited to the correlation analysis between dynamic elastic modulus and dynamic Poisson's ratio and static elastic modulus and static Poisson's ratio, but how to use acoustic wave velocity to predict other rock (body) physical and mechanical parameters (density, There are not many studies on compressive strength and tensile strength, etc., and most of the rocks are igneous rocks and several common metamorphic rocks, such as marble, granite, etc.

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