Drilling detection method for coal measure stratum structuring, weak area recognition and stratum inversion

Abstract

The invention belongs to underground drilling detection methods for deep strata and relates to a drilling detection method for coal measure stratum structuring, weak area recognition and stratum inversion. An upward or downward penetrating long borehole is constructed in a mine coal-rock roadway; thrust, rotational speed, torque and drilling speed are recorded and calculated during drilling; energy consumed by drilling unit rock, namely drilling specific energy, is deducted so as to acquire a correspondence between the drilling specific energy and a drilling path; coal-rock seams in the coal measure stratum are different in physical and mechanical property, thus a drilling difficulty difference under equal conditions is high, different drilling ratios correspond to different coal-rock types, and the coal-rock types of different segments of the drilling path are determined accordingly; the drilling ratio on the drilling path can change abruptly, indicating the geological structure conditions. The drilling detection method has the advantages that by accurately controlling occurrence and geological structure conditions of the coal-rock seams of the coal measure stratum, mine coal-rock power, hydropower and gas disasters can be preventively controlled, and gas drainage and water drainage are more specific.

Description

technical field [0001] The invention relates to an underground drilling detection method in deep formations, in particular to a drilling detection method for coal measure formation structure, weak area identification and formation inversion. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of the primary energy for a long time, and it extends to the deep year by year with the increase of mining intensity. Activities such as uplifts, depressions, folds, and faults, the geological conditions are extremely complex under the action of structural extrusion and shear stress, and the deep high ground stress and gas pressure lead to rock bursts, mine earthquakes, water inrush, coal and gas outbursts, etc. Power, hydropower and gas disasters are more serious. Coal measure strata are mostly soft-medium hard sedimentary rocks with a typical layered structure, mainly composed of sandstone, shale, mudstone, conglomerate, and coal. Differ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a drilling method for coal-measure strata structure, weak area identification and stratum inversion in view of complex and changeable geological conditions of coal-measure strata in deep mine mining, and serious coal-rock dynamic, hydrodynamic and gas disasters. detection method

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