Prediction method for coal and gas outburst based on seismic information

Abstract

The invention discloses a prediction method for coal and gas outburst based on seismic information. The prediction method includes following steps: determining main geological factors for affecting coal seam gas occurrence and outburst according to the mine geological condition of a coal mining area; classifying the geological factors according to the classification criterion of the factors for affecting the coal seam gas occurrence and outburst; determining the weight coefficient Omegai value of the main geological factors according to the contribution of various geological factors to the gas outburst; calculating the gas outburst danger coefficient G value and the gas outburst hazard index R value; and predicting and evaluating the coal seam gas outburst regarding the gas outburst hazard index R value as the evaluation index. According to the prediction method, the main geological factors for affecting the coal seam gas occurrence and outburst are quantified by the adoption of various lithological seismic methods, the prediction and evaluation method for the coal and gas outburst based on the seismic information is proposed, deformed coal development areas and gas enrichment areas related to gas outburst are evaluated and predicted, and important technical support is provided for the prevention of the coal mine gas outburst.

Description

technical field [0001] The invention relates to a method for predicting coal and gas outburst based on seismic information, and belongs to the technical field where applied geophysics and mining engineering intersect. Background technique [0002] Gas is a mixed gas mainly composed of methane that is formed by coalification and exists in coal seams. Coal and gas outburst refers to coal mine disasters in which various harmful gases released from coal seams, rock formations and goafs are enriched and gushed out on the working face during the production process of coal mines, thereby causing gas explosions. [0003] 46% of China's coal mines are high-gas mines with high gas content and low coal seam permeability, making it difficult to drain gas before mining. In addition, my country's coalfield structure is very complex and the ground stress is large, and gas outbursts are prone to occur during mining. With the gradual increase of mining depth, the number and degree of coal a...

AI Technical Summary

Problems solved by technology

The main problems are: in the prediction process of coal and gas outburst, (1) only a single influencing factor is considered, and multiple influencing factors are not considered at the same time; (2) only qualitative evaluation is performed, and quantitative evaluation is not performed

Therefore, the distribution law of coal seam gas enrichment cannot be obtained by using the current exploration methods, which makes it impossible to formulate targeted measures according to the gas distribution in the production process of coal mines.

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