Method for interpreting range of magmatic rock intrusion into coal layer based on seismic information

Abstract

The present invention provides a method for interpreting a range of magmatic rock intrusion into coal layers based on seismic information, and belongs to the methods for interpreting ranges of magmatic rock intrusion into coal layers. The method comprises three lithologic interpretation methods of seismic inversion, seismic facies analysis and spectrum decomposition; when there are provided with many drilling wells and logging information within a region, i.e., 3-4 wells per square kilometer, the seismic inversion method is used; when the number of drilling wells is small in the region or logging information lacks, the seismic facies analysis and spectrum decomposition methods are used in combination. The three lithologic interpretation methods of seismic inversion, seismic facies analysis and spectrum decomposition are used, and seismic wave dynamics information such as high wave impedance, high frequency and waveform abnormalities of magmatic rocks is comprehensively utilized. In combination with drilling and mining geology information, works for interpreting the range of magmatic rock intrusion into the coal layers are carried out. The method is advantageous in that cross technology of physical geography and mining engineering is applied, geological guarantees are provided for coal mine safety production, the production cost is lowered, and the service life of equipment is raised.

Description

technical field [0001] The invention relates to a method for explaining the range of magmatic rocks intruding into coal seams, in particular to a method for interpreting the range of magmatic rocks intruding into coal seams based on seismic information. Background technique [0002] The impact of magmatic rock intrusion into the coal seam is great. Coal seams are subject to erosion, cutting, and deterioration, and their integrity and mineability are damaged. At the same time, the risk of mining increases. The specific impact is mainly reflected in the change of coal quality and the safe production of coal mines. [0003] The influence of magmatic rocks on coal quality when intruding into coal seams: [0004] (1) When magmatic rocks intrude into coal seams to form sills, the degree of damage to coal seams is relatively large, and it is related to the position where magmatic rocks intrude into coal seams. Generally, the middle part of the intruded coal seam has the greatest ...

AI Technical Summary

Problems solved by technology

[0008] (1) The intrusion of magmatic rocks causes the coal seam to produce gas and hydrogen sulfide, forming a gas enrichment zone, and there is a hidden danger of gas outburst

[0009] (2) When the magmatic rock cools and shrinks during the formation process, it will produce cracks and form a relatively water-rich section, which has the hidden danger of mine water inrush

[0010] (3) The intrusion of magmatic rocks cuts the coal seam into several sections, which brings many difficulties to roadway excavation and working face mining

[0011] (4) The intrusion of magmatic rocks increases the degree of metamorphism and even coking of coal seams, resulting in a significant reduction in proven reserves and shortened mine service life

[0012] (5) The intrusion of magmatic rocks leads to the increase of coal ash, the decrease of volatile matter, and the deterioration of cohesiveness. The mining of coal seams with high metamorphism not only affects the life of the machine, but also reduces the economic benefits

[0014] The problem is that the vertical resolution of borehole data is very high, but the number is too small, which reduces the interpretation accuracy of magmatic rock intrusion into the coal seam boundary

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