Geological tracing and reconstruction method of gas

Abstract

The invention, which belongs to the field of geological exploration, relates to a geological tracing and reconstruction method of gas. The method comprises three parts: three-dimensional reconstruction of a coal-forming environment is carried out to restore a coal-forming environment and a three-dimensional space mode; and basic conditions of gas reservoir forming, coal primary structure, and reservoir physical and mechanical properties are cognized; geological structure evolution and historical foming, reservoir, extinguishing processes of the gas are reconstructed, the structure evolution ofa coal measure strata is combined with the concomitant methane gas reservoir rule to realize inversion of the time and space changes of the coal seam burying and the historical foming, reservoir, extinguishing processes of the gas, and a dynamic gas geological model is established; and numerical simulation and similar simulation experiments are carried out on geological relics feature quantitative reconstruction of gas, different gas geological relics feature and gas correlation models are established respectively, and reserve rules of typical geological relics like the metamorphic rocks andigneous rocks and coal seam gas are constructed in a matched manner. Therefore, the process from forming to later-stage transformation of coal bed gas is analyzed, so that adaptability to various geological condition is improved, the gas reservoir forming process and the disaster-causing mechanism are disclosed, and the safety production of the coal mine and the coal bed gas exploitation are guided.

Description

technical field [0001] The invention belongs to the field of geological exploration, and relates to a method for gas geological traceability and reconstruction. Background technique [0002] Due to the complexity of coal and rock geological conditions and the concealment of gas occurrence, it is difficult for people to understand the gas geological conditions, such as gas reserves and gas disasters, but can only be deduced from the amount of gas emitted after the mining project and local detection results Gas geology. Therefore, people have always hoped to establish a method for gas geological traceability and reconstruction, using limited known conditions to predict gas geological conditions. [0003] However, it is impossible to establish a gas geological reconstruction method that is suitable for all gas geological conditions. Although a lot of literature is devoted to establishing a model capable of predicting the law of gas occurrence and simulating the deep gas param...

AI Technical Summary

Problems solved by technology

[0005] However, the prominent problems in the current research are: (1) lack of universality, the theory of geological adaptability of coal reservoir reconstruction technology is immature, and it is impossible to give a reasonable explanation for some typical gas storage, and a typical reservoir has not yet been established The relationship between characteristics-reservoir reformation-reformation effect leads to significant differences in the same reformation method in different blocks, or even in the same block, making it difficult to evaluate the effectiveness of reservoir reformation

For example, the Donglin Coal Mine of Nantong Mining Group is buried at a depth of 600m, and the coal seam gas pressure reaches 21MPa, which is quite different from the traditional coal seam gas accumulation law of 0.01H (6MPa). In China, there is a large difference in the occurrence of coal seam gas in the eastern and western regions, which does not conform to the traditional view

(2) Lack of systematization, and there are many theories of gas geology, such as "structural control theory step by step", "big data thinking gas geological analysis", "multi-layer superimposed independent coalbed methane system", etc. control effect

Under different geological conditions, the law and mechanism of gas occurrence and development are not fully understood, and the theoretical reliability of the optimization of favorable production areas is low, resulting in low accuracy in the selection of favorable areas; the main control of single well production under the control of different geological conditions and reservoir types Unknown factors lead to low production capacity

(3) Lack of dynamic process considerations. Most of the existing gas geological theories are researched based on existing established information, lacking process-based thinking analysis

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