CN1291242C - Application of ultra-low frequency geological remote sensing and detecting device in mash gas detection - Google Patents
Application of ultra-low frequency geological remote sensing and detecting device in mash gas detection Download PDFInfo
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- CN1291242C CN1291242C CN 200510017635 CN200510017635A CN1291242C CN 1291242 C CN1291242 C CN 1291242C CN 200510017635 CN200510017635 CN 200510017635 CN 200510017635 A CN200510017635 A CN 200510017635A CN 1291242 C CN1291242 C CN 1291242C
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Abstract
The present invention relates to an application of an ultra-low frequency geological remote sensing and detecting device in mash gas detection. Firstly, the existing equipment is improved, namely that a compass is additionally arranged on an antenna, and the voltage of the power supply of a preamplifier is reduced. After that the local geological information is analyzed, and the detection is carried out above an exploited region. The optimal azimuth angle of the antenna, the optimal sampling density and the optimal sampling points are selected, the sensibility is adjusted, and profile lines are distributed in the detected region according to the situation of the geological information. The detection is carried out in the detection region by using the same parameters, an electromagnetic depth detecting picture is printed, and the magnitude of the pressure of mash gas is judged according to the change of the amplitude value of a coal measure stratacurve curve. The method of the present invention can forecast mash gas in coal mines to thoroughly stop mash accidents for reducing the government property loss and ensuring coal miners' safety, and the present invention performs an important instruction function to the comprehensive treatment of mash gas.
Description
One, technical field
The present invention relates to a kind of application of ulf geological remote sensing device, the application of ulf geological remote sensing device in Device in Gas Detection specifically.
Two, background technology
Ulf geological remote sensing device is the Wang Shuyuan of Peking University professor's a patent, and the patent No. is 02234961.8, and this technology is never used in Device in Gas Detection after obtaining patent.More external in recent years similar technology are tried out in some geology detectings of China among a small circle owing to its advance in geology detecting.The means that tradition is surveyed geological information have explosion method and gas explosion method usually, are about to explosive release and are arranged on undergroundly, ignite then, make it at underground explosion, utilize instrument to receive again and analyze that blast produces, through the sound wave that the stratum is passed back, obtain formation information.Its shortcoming is: this method need be utilized corresponding drilling equipment, and the decay of signal is very big, and the depth of stratum of surveying is limited.
Ulf geological remote sensing device and external like product all are to be the work field source with the earth terrestrial magnetic field, utilize the difference of different medium electromagnetic property to measure underground lithology interphase is explained different depth to the reflective information of natural electromagnetic field tectonic structure, reach a kind of passive remote sensing electromagnetic survey method that solves geological problem, also can be considered a kind of new method of passive source crustal magnetotelluric measurement.Ulf geological remote sensing device is actually to observe by the surface em ripple studies subsurface rock resistivity.This resistivity is not the real resistivity of medium, but the combined reaction that resistivity of media distributes.Explain lithology by the variation characteristic of analyzing resistivity, only explain that the result that lithology lacks the degree of depth does not have available value in geology detecting.The electromagnetic field of telling different depth in numerous frequency spectrums is the difficult point and the key of this technology.Be humorous change along the direction of propagation when electromagnetic field that is changed in time as can be known in the even propagation characteristic of earth medium by plane electromagnetic wave is propagated in the homogeneous isotropism earth medium, and press index law and decay.The resistivity of medium is low more, the high more decay of signal frequency fast more, and at this moment field source will only concentrate on the superficial part of medium, both skin effects, thereby penetration depth is also referred to as skin depth.The electromagnetic wave penetration depth of different frequency is also different, and when frequency was very high, electromagnetic wave may only concentrate in first dielectric layer, and electromagnetic field is not subjected to the underburden resistivity effects.Along with reducing of frequency, penetration depth increases, and apparent resistivity value will be subjected to the influence that the deep resistivity of media distributes.By the wave frequency information that detects, set up the feature of degree of depth inverting pattern analysis resistivity, explain subsurface information such as tectonic structure, important geological interface, mineral resources distribution, tomography.So ulf geological remote sensing device is applied to the method for several maturations of geology detecting at present and is mainly used in detection coal, oil, underground water and tomography etc.
Device in Gas is usually contained in the colliery, has brought certain risk to exploitation, and direct loss and casualties that invar this blast in annual colliery causes to country all are huge.If can before coal mining, utilize new high-tech technology to verify the region of Device in Gas, it is got rid of, then can reduce the risk of coal-mine gas accident greatly, the generation of fundamentally stopping the gas burst accident.But traditional geophysical prospecting method can't be measured the storage scope and the pressure of underground Device in Gas on ground, so to the improvement of Device in Gas very blindly, can't determine to administer the zone, does not reach the purpose of stopping gas accident.
Three, summary of the invention
The objective of the invention is to propose a kind of new application process of prior art equipment ulf geological remote sensing device on Device in Gas Detection that utilize, the one, widened the range of application of this equipment, the more important thing is that having solved present coal mine mash gas can not administer with a definite target in view, it is too big to administer blindness, and the significant problem of gas explosion accident often takes place; The application of this method can be verified underground Device in Gas rich region on ground, provides foundation for thoroughly administering watt phase gas.
Method of the present invention is:
1, ulf geological remote sensing device is improved: (1) has installed compass additional on antenna.Make the antenna direction accurate positioning, very big to the result of detection influence because of the position angle of antenna, the curve difference that same place different orientations is measured is very big, only chooses correct position angle and just can measure the good curve of signal to noise ratio (S/N ratio).On same profile line, have only the curve that adopts identical position angle to measure just can make correct explanation.On antenna, install compass additional, make Antenna Positioning convenient, accurate.(2) reduce prime amplifier and amplify voltage.When power supply was reduced to positive and negative 4.5V-4.8V, the curve quality of measuring was best by test, therefore changed former positive and negative 6V power supply into positive and negative 4.5V-4.8V power supply, had improved the signal to noise ratio (S/N ratio) and the stability of instrument.
2, Device in Gas Detection method:
(1) according to the geologic information of locality,, gas emission, ventilation under the mine are carried out basic understanding to gas source bed, gas bearing reservoir, cap rock initial analysis.(2) above the zone of exploiting, survey earlier, select the antenna optimum azimuth, make the detective curve signal to noise ratio (S/N ratio) best; Select optimum sampling density and sampling number; Adjust sensitivity and make coal measure strata profile amplitude on the scale of depth line 2-3 centimetre.(3), lay profile line at detecting area according to the data situation of understanding.(4) survey at detecting area with same parameter, and determine Device in Gas pressure size according to coal measure strata curve amplitude variable quantity.
Compass installs additional and to reduce the prime amplifier voltage supplied very simple, and the colleague technician all can finish voluntarily; Select optimum sampling density and sampling number, fibrous root is decided according to the different geological conditions of different location, and the colleague technician can finish voluntarily.
Because Device in Gas has certain pressure, be present in for a long time again in coal seam and near the sandstone, form gas bearing reservoir, institute is so that have the coal seam and the sandstone resistivity of Device in Gas and raise, the big more resistivity liter of pressure high more.The variation of the apparent resistivity curve of measuring by ulf geological remote sensing device just can explain the enrichment scope of Device in Gas under the measuring point, and pressure is carried out qualitative interpretation.
The good effect of the inventive method is: can utilize the accurate convenient and simple ground of prior art equipment on the ground the Device in Gas in coal seam to be predicted in advance, thoroughly effect a radical cure gas accident, and can play important directive function to the comprehensive regulation of Device in Gas; Can reasonably administer or develop according to the reserves of the Device in Gas of surveying, when very big as if reserves, directly discharging can cause energy dissipation, also causes the severe contamination of environment simultaneously, can build the methane electrical generation station according to the coal seam gas-storing capacity that detects, and changes harmful to treasure.
Four, description of drawings:
Fig. 1 is the electromagnetic sounding curve map in the goaf of what No. 2 point of village mine of precious Yu Shan colliery, Yichuan, Henan Province, and horizontal ordinate is an apparent resistivity, and ordinate is a depth of stratum;
Fig. 2 is the electromagnetic sounding curve map of unminding the district of what No. 1 point of village mine of precious Yu Shan colliery, Yichuan, Henan Province;
Fig. 3 is the electromagnetic sounding curve map in the goaf of No. 1 point in Jin Ling colliery, Dengfeng City, Henan Province;
Fig. 4 is the electromagnetic sounding curve map of unminding the district of No. 4 points in Jin Ling colliery, Dengfeng City, Henan Province;
Five, embodiment
With No. 1 point in Jin Ling colliery, Dengfeng City, Henan Province and No. 4 points is example, specifies the embodiment of the inventive method:
The test block is positioned at platform south, North China, contains coal measures and grows, and Cambrian system is arranged, Permo-carboniferous system, and the triple-lap Jurassic systerm, coal measure strata thickness is about 600-800 rice.Dark mud rock thickness is on average more than 200 meters, and average 14 meters of overall thickness of coal bed belongs to the height meta anthracite.
Gas source bed
Gas source bed is the material base of Device in Gas, and gas source bed is than horn of plenty in this mining area, and wherein lithology is mainly the coal seam, dark mud rock contains organic limestone, and the main gas source bed of dyas is source group one coal section too, Shanxi group two coal sections, following stone box group three coal sections reach and go up stone box group 4178 coal sections.
Gas bearing reservoir
Coal, dyas gas bearing reservoir lithology is generally sandstone, and the sandstone type mainly contains quartzose sandstone, arkosic arenite, rock-fragment sandstone etc.The reservoir mainly contains too source group basal sandstone, Shanxi group bottom thick-layer or medium bed sandstone, and following stone box group basal sandstone, last stone box group basal sandstone, top is tafelberg sandstone section.
Cap rock
Known cap rock has the mud stone layer, the tight stratum of gypsum-salt rock layer and non-infiltration.Character, thickness, distribution range by cap rock can be divided into regional cap rock, regional cap rock and interlayer cap rock.
(1) this mining area coal, two laminated cap rocks are Paleogene system, are the river gyittja of a cover based on mud stone, the local growth has gypsum-salt bed.
(2) regional cap rock mainly contains two-layer: the one, and Shi Qianfeng group aubergine pelyte and last stone box group top mud stone constitute jointly cap rock; The 2nd, the variegated mudstone layer on following stone box group top, widely distributed, the capping ability is strong.
(3) interlayer cap rock: coal, interlayer mud stone and impervious formation in the stratum, dyas coal seam.
Gas emission is the about 14-16 cubic meter of coal per ton under the mine.
The Device in Gas Detection method:
1,,, thinks that this district belongs to the Device in Gas enrichment region to gas source bed, gas bearing reservoir, cap rock initial analysis according to above-mentioned geologic information.
2, at first above the zone of exploiting, survey, select the antenna optimum azimuth, make the detective curve signal to noise ratio (S/N ratio) best.Select optimum sampling density and sampling number.Adjust sensitivity and make coal measure strata profile amplitude on scale of depth 2-3 centimetre.
3,, lay profile line at detecting area according to the data situation of understanding.
4, usefulness and the same parameter of above goaf detection test are surveyed at detecting area, measure the electromagnetic sounding curve, just can determine the size of Device in Gas pressure according to coal measure strata curve amplitude variable quantity.
Result of detection:
No. 1 point in Jin Ling colliery, Dengfeng City, Henan Province, because of its selection be the sensing point of this coal mine gob top, so from the no abnormal reaction of electromagnetic sounding figure; No. 4 point selection in Jin Ling colliery, Dengfeng City, Henan Province are unminded above the district the east, mining area, thus from the electromagnetic sounding figure as can be seen 238 meters to 748 meters have high gas unusual.
Device in Gas pressure was lower when electromagnetic sounding curve map profile amplitude changed to 3-5 centimetre by 2-3 centimetre, generally was safe from danger; Device in Gas pressure is higher when changing to 5-7 centimetre, and the Device in Gas accident hazard is arranged, and will add forced ventilation when the exploitation of this zone, and gas air pressure is high especially when changing to curve and cut the top, the danger that the Device in Gas burst accident takes place is arranged, the prevention of should taking measures in advance.
Claims (1)
1, the application of ulf geological remote sensing device in Device in Gas Detection is characterized in that: at first install compass additional on the antenna of ulf geological remote sensing device, make Antenna Positioning accurately convenient; Again the supply voltage of prime amplifier is reduced to positive and negative 4.5-4.8v, carry out Device in Gas Detection then, its detection method is:
(1) according to the geologic information of locality, gas source bed, gas bearing reservoir, cap rock are carried out initial analysis, gas emission, ventilation under the mine are carried out basic understanding;
(2) above the zone of exploiting, survey earlier, select the antenna optimum azimuth, make the detective curve signal to noise ratio (S/N ratio) best; Select optimum sampling density and sampling number; Adjust sensitivity and make coal measure strata profile amplitude on the scale of depth line 2-3 centimetre;
(3), lay profile line at detecting area according to the data situation of understanding;
(4) survey at detecting area with same parameter, and determine Device in Gas pressure size according to coal measure strata curve amplitude variable quantity.
Device in Gas has certain pressure, be present in for a long time again in coal seam and near the sandstone, form gas bearing reservoir, so having the coal seam and the sandstone resistivity of Device in Gas raises, it is high more that the big more resistivity of pressure rises, the variation of the apparent resistivity curve of measuring by ulf geological remote sensing device just can explain the enrichment scope of Device in Gas under the measuring point, and pressure is carried out qualitative interpretation.
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| CN 200510017635 CN1291242C (en) | 2005-05-18 | 2005-05-18 | Application of ultra-low frequency geological remote sensing and detecting device in mash gas detection |
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| CN 200510017635 CN1291242C (en) | 2005-05-18 | 2005-05-18 | Application of ultra-low frequency geological remote sensing and detecting device in mash gas detection |
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| CN1291242C true CN1291242C (en) | 2006-12-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101392648B (en) * | 2008-09-28 | 2012-04-25 | 中国地质大学（武汉） | Probing ahead and sampling apparatus for coalbed gas in exploratory boring |
| CN101839130B (en) * | 2009-03-19 | 2013-05-22 | 河南理工大学 | Gas sample acquisition and analysis device for coal mine gob |
| CN113029643B (en) * | 2021-02-26 | 2022-09-23 | 西安坤安勘测科技有限公司 | Mine hydrogeological condition detector |
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