A method and device for predicting the range of igneous rock intrusion

Abstract

The invention provides an igneous rock intrusion range prediction method and device. The method comprises steps: three-dimensional seismic data and logging data in a research area are acquired; a density curve of each drilling hole is reconstructed according to rock sample data obtained after coring of each drilling hole; by using the three-dimensional seismic data, the logging data and the density curve of each drilling hole, density inversion is carried out, and a density data volume is acquired, wherein the density data volume is a set of density values at positions in a formation in the research area; the density value of each target point in a target coal seam is extracted from the density data volume, the density value of each target point is compared with a pre-acquired density value distribution interval corresponding to the igneous rock, and according to the comparison result, the intrusion range of the igneous rock in the target coal seam can be predicted. According to the embodiment of the invention, density reconstruction is carried out on multiple drilling holes in the research area, density inversion is carried out according to the density curve after reconstruction,the prediction result accuracy is improved, and the problem of few logging data is solved.

Description

technical field [0001] The present application relates to the technical field of underground exploration, in particular, to a method and device for predicting the intrusion range of igneous rocks. Background technique [0002] Igneous rocks are rocks that condense from magma that has intruded into the Earth's crust or been ejected from the surface. Today, igneous rocks formed by magma intrusion are found in nearly one-third of coal seams in my country. In some mining areas, igneous rocks have even become the main geological factors restricting coal mine production. Due to the influence of igneous rocks, the thickness and structure of coal seams are destroyed, forming a natural Coke, even some coal seams are completely swallowed by igneous rocks, which seriously affects the high yield, high efficiency and safe production of coal mines. Some current methods for predicting igneous rock intrusion in coal seams often cannot constrain the inversion results well when there are few l...

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Problems solved by technology

[0003] The purpose of the embodiments of the present application is to provide a method and device for predicting the intrusion range of igneous rocks, which are used to predict the intrusion of igneous rocks in coal seams, and perform density reconstruction for multiple boreholes in the research area. According to the reconstructed density The density inversion of the curve solves the problem that the inversion results cannot be well constrained when the logging data of the boreholes in the study area is small, and at the same time improves the accuracy of the prediction results

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