CN103207417A - Exploration process of superficial layer natural gas - Google Patents
Exploration process of superficial layer natural gas Download PDFInfo
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- CN103207417A CN103207417A CN2012100135090A CN201210013509A CN103207417A CN 103207417 A CN103207417 A CN 103207417A CN 2012100135090 A CN2012100135090 A CN 2012100135090A CN 201210013509 A CN201210013509 A CN 201210013509A CN 103207417 A CN103207417 A CN 103207417A
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Abstract
The invention relates to an exploration process of superficial layer natural gas. The exploration process of the superficial layer natural gas comprises early reconnaissance and a field test. In a reconnaissance process, a home-made exploration head is connected with an exploration rod to arrange a static penetrometer; the exploration head is always in connection with the exploration rod in the pressing process of the static penetrometer; and when the static penetrometer is at an appoint position, the exploration rod is lifted, the exploration head and the exploration rod are automatically separated, gas at this moment can be vented from a central channel of the exploration rod, and if the air pressure and the flow are small, a BXC-02 combustible gas detection alarm is used to detect whether gas overflows at an opening of the exploration rod or not. In the field test, a static pressure device is firstly used to press the exploration rod into a preset depth under the ground in order to accurately measure the burial depth of a bottom plate with an air layer, then the exploration rod is lifted to examine whether gas overflow exists or not, if gas overflow exists in the lifting process, the depth with gas overflow is the burial depth of the bottom plate with the air layer.
Description
Technical field
The present invention relates to a kind of shallow layer gas detection process.
Background technology
Shallow layer gas is exactly shallow biogas, is the gas that organism produces under the biological chemistry action of low temperature mezzanine level anaerobic bacteria, and its main geochemistry sign is that component CH4 content is higher and carbon isotope is light, δ
13The C1 value is generally-75 ‰～-55 ‰.
The existence of shallow layer gas has increased the difficulty of control earth pressure balance widely; the possibility that produces geologic hazard in shield structure progradation has increased widely; for guaranteeing the safety of engineering construction; protect numerous workmens' the security of the lives and property and normally carrying out of engineering, strengthen the research of shallow layer gas is just more seemed that it is significant.
Method of exploration to shallow layer gas mainly contains at present:
(1) static sounding
From the 1950's to the end of the eighties, the exploration history under four has been passed through on four in biogas exploration in Hangzhou Wan area.Until the beginning of the nineties, the static sounding technology has just obtained certain exploration effects in some areas after succeeding and using in the shallow biogas exploration, formed certain gas production ability.Static sounding is a kind of home position testing method commonly used in the ground engineering prospecting, and it is the prospecting means that exploration combines with test.Its principle is with static(al) probe to be pressed in the stratum, utilizes the resistance sensor in the probe.Penetration resistance (static point resistance qc and sidewall friction power fs) by electronic measuring instrument record probe.Because the size of penetration resistance is relevant with the character on stratum, therefore can reach the purpose of understanding formation properties by the variation of analyzing penetration resistance.The advantage that the static sounding technology applies to the shallow layer gas exploration is: 1. equipment is light, with low cost, only is about 1/10 of same degree of depth rotary drilling cost; 2. can obtain qc and fs curve with boring, can be used for judging vertical succession of strata, not need to bore completion electrical measurement again; 3. can qualitatively judge institute and whether drill in the stratum gassiness.Yet its limitation is: 1. investigation depth is limited, generally can only detect 50 in the Hangzhou Wan area surplus rice; 2. be not suitable for gravel bed, chance contained gravel more than 30% o'clock, and data distortion can occur even can't creep into; 3. because the too little easy obstruction of well generally is not suitable for beating producing well.
(2) seismic prospecting
One-tenth according to rock gas is hidden principle, and namely the rock gas that density is little is discharged from angry layer, is subjected to buoyancy control along upwards migration of the hole in the stratum.Covering can not further make progress under the sealing role of confining bed migration or loss, can only be in dredging layer lateral migration, converge at the top of layer of sand or lens sand body.Converging in the process of shallow gas, gas converge the occupied space of former pore water of constantly squeezing in the layer of sand, pool gas reservoir at the top of sand body gradually, the hole of bottom layer of sand is still moisture, forms gas, water with the gas reservoir of layer.The gassiness in the layer of sand hole owing to underlie, its block density is little, and on the wave impedance difference covered between the clay relatively large, its reflecting interface reflection amplitude on seismic section is stronger relatively, this is the favourable foundation of identification METHOD OF SHALLOW GAS RESERVOIRS.
(3) non-seismic geophysical and geochemical exploration method
The non-seismic geophysical and geochemical exploration method mainly comprises geological radar, gravity negative effect, echo depth sounding and sonar, induced polarization, hydrocarbon geochemical exploration, remote sensing, static Alpha (α) measured thin film, microbial method etc., and wherein static Alpha measured thin film and microbial process effect in sparker survey is better.
1. static Alpha measured thin film
Normal and the oil gas symbiosis of uranium in sedimentogeneous rock.Hydrocarbon zone is in the strong reducing environment, and the radium that is dissolved in the water and part uranium pass through the vertical movement of water component to globak migration.The decay product radon of uranium and radium also by convection current, diffusion or along the crack, upwards migration of shatter belt, therefore, it is unusual often to occur radon above hydrocarbon-bearing pool.The existence that the radon concentration that records according to the face of land can descend hydrocarbon-bearing pool speculatively whether.Practice shows that numerous oil gas field tops present faint low value radioactivity anomaly, substantially corresponding to oil gas field profile in the plane, and the high value of radioactivity often occurs unusually at the oil gas field edge.
Static Alpha measured thin film at first will be with the poly-vinegar film card of-1000V voltage, be embedded in underground 40cm place, take out card through certain hour, with the transmitted intensity on Alpha's (α) the radiation gauge measurement card, judge gas reservoir by the radon abnormal quantity value of measuring.
Find that by the test in the Hangzhou Wan area static Alpha (α) measured thin film method is a kind of new method of reconnoitring shallow layer gas effectively, fast, it is characterized in that drawing a circle to approve the border that shallow biogas is hidden unusually according to the radon that occurs directly over the gas field.The radon survey method has that disturbing factor is few, highly sensitive, favorable reproducibility, scene are obtained advantages such as result, economical and effective fast.
2. microbial method
1998-1999 has successively gathered more than 200 pedotheque in the Xiaoshan, Zhejiang area and has carried out microbiological prospecting research, according to experimental analysis, determine that methanobacteria is the indicator bacteria of shallow biogas, other 5 kinds of soil bacterias (Flavobacterium, bacillus, Acinetobacter, Xanthomonas and Pseudomonas) content and distribution situation also have certain indicative function.
3. resistivity prospecting
EH4 magnetography system combines controllable source audio-frequency magnetotelluric magnetic method (CSAMT) and magnetotelluric method (MT), becomes a kind of tensor formula conductivity measurement system of novel concept.This system uses natural electromagnetic field and artificial electromagnetic field signal, can measure several meters to the variation of the interior resistivity of the 1000m degree of depth, and can obtain the serial section of conductivity variations under the various topographic conditions.This system has lightly portable, easy to operate, construction advantage such as simple, with low cost, is fit to very much the shallow-layer geologic prospecting.EH4 magnetography system predictably descends geological condition by the variation of measured resistivity, that is to say, when the underground resistivity contrasts that is adjacent to plastid reached certain value, the magnetography system just can be distinguished them.Gassiness layer of sand with the Hangzhou Wan area is example, the gassiness layer of sand in Hangzhou Wan area is sandwiched in valley flat-estuary deposit, buried depth is more shallow, but because the incision river valley is subjected to the influence of tidal action, the salinity of local water is high relatively in the layer of sand, total mineralization generally about 10000mg/1, has satisfactory electrical conductivity; Gas-bearing formation poorly conductive, resistivity are higher, form significant difference with the resistivity of water layer.Thereby, can by measure gas-bearing formation and normally layer resistivity difference identify gas-bearing formation.
Summary of the invention
The invention provides a kind of shallow layer gas detection process, solved the probe a series of difficult problems such as the discontented sufficient traffic requirement of obstruction, flowmeter range that freely come off, pop one's head in.
Shallow layer gas detection process of the present invention may further comprise the steps:
A. prospecting in early stage: in the prospecting process, link to each other with feeler lever by homemade probe, the static penetrometer of packing into, press down in the process probe at feeler inspection and link to each other all the time with feeler lever, when the arrival assigned address, on carry feeler lever, probe can separate automatically with feeler lever, can by feeler lever center-aisle outward give vent to anger if any gas this moment, and whether earlier with BXC-02 inflammable gas detection alarm instrument, measuring at the feeler lever mouth has gas to overflow as air pressure and flow very I;
B. on-the-spot test: in order accurately to record the base plate buried depth of gas-bearing horizon, at first with static pressure equipment feeler lever is pressed into to below ground predetermined depth place, slowly feeler lever is upwards mentioned then, whether check has gas to overflow, if in the process of mentioning when finding to have gas to overflow, then the degree of depth at this place is gas-bearing horizon base plate buried depth; Block feeler lever termination portion in order to prevent earth, can adopt gas cylinder to be pressed into the gas of 1MPa pressure in the feeler lever, close after 3 minutes, adopt BXC-02 inflammable gas detection alarm instrument, in the gas outlet, detect whether inflammable gas is arranged, if any inflammable gas then the degree of depth at this place be gas-bearing horizon base plate buried depth, but as do not have the feeler lever of discovery and put forward the 0.5m-1m duplicate detection once whenever, up to passing the gas-bearing horizon of intending existence, the definite of top board buried depth can consider to determine according to the overlayer of gas-bearing horizon and the concrete geology Information integration of gas-bearing horizon.
Compared with prior art, beneficial effect of the present invention is: 1, equipment and instrument ample supply of commodities on the market; 2, processing step is rigorous, and continuity requires high; 3, the design of the key parameter of technology is strict, and soft clay area is had generalization; 4, processing step easy simple to operate; 5, the data measured of actual verification explanation accurately and reliably; 6, can be widely used in the city underground engineering investigation and prospecting.
Description of drawings
Fig. 1 is process chart of the present invention.
Embodiment
Below in conjunction with Fig. 1, the specific embodiment of the present invention is described in further detail.
The shallow layer gas detection process of present embodiment is to carry out according to following steps,
A. prospecting in early stage: in the prospecting process, at first link to each other with feeler lever by homemade probe, the static penetrometer of packing into, press down in the process probe at feeler inspection and link to each other all the time with feeler lever, when the arrival assigned address, on carry feeler lever, probe can separate automatically with feeler lever, can by feeler lever center-aisle outward give vent to anger if any gas this moment, and whether earlier with BXC-02 inflammable gas detection alarm instrument, measuring at the feeler lever mouth has gas to overflow as air pressure and flow very I;
BXC-02 inflammable gas detection alarm instrument principle of work and the scope of application: BXC-02 inflammable gas detection alarm instrument sensor with diffusion way directly with environment in tested gas reaction, the voltage signal of generation linear change.Signal processing circuit is made of the polylith integrated circuit based on intelligent chip.Sensor output signal amplifies through filtering, analog to digital conversion, processing such as model calculation, the direct concentration value that shows tested gas at liquid crystal display.When gas concentration reaches the alarming value that presets, instrument will send sound, the visual alarm of different frequencies according to the difference of alert levels.BXC-02 inflammable gas detection alarm instrument is applicable to the concentration of inflammable gass such as continuous detecting alkanes, alcohols and organic volatile in the working environment can be widely used in the security protection of industries such as oil, chemical industry, rock gas, fire-fighting.
B. on-the-spot test: in order accurately to record the base plate buried depth of gas-bearing horizon, at first with static pressure equipment feeler lever is pressed into to below ground predetermined depth place, slowly feeler lever is upwards mentioned then, whether check has gas to overflow, if in the process of mentioning when finding to have gas to overflow, then the degree of depth at this place is gas-bearing horizon base plate buried depth; Block feeler lever termination portion in order to prevent earth, can adopt gas cylinder to be pressed into the gas of 1MPa pressure in the feeler lever, close after three minutes, adopt BXC-02 inflammable gas detection alarm instrument, in the gas outlet, detect whether inflammable gas is arranged, if any inflammable gas then the degree of depth at this place be gas-bearing horizon base plate buried depth, but as do not have the feeler lever of discovery and put forward the 0.5m-1m duplicate detection once whenever, up to passing the gas-bearing horizon of intending existence, the definite of top board buried depth can consider to determine according to the overlayer of gas-bearing horizon and the concrete geology Information integration of gas-bearing horizon.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (1)
1. a shallow layer gas detection process is characterized in that, is to carry out according to following steps:
A. prospecting in early stage: in the prospecting process, link to each other with feeler lever by homemade probe, the static penetrometer of packing into, press down in the process probe at feeler inspection and link to each other all the time with feeler lever, when the arrival assigned address, on carry feeler lever, probe can separate automatically with feeler lever, can by feeler lever center-aisle outward give vent to anger if any gas this moment, and whether earlier with BXC-02 inflammable gas detection alarm instrument, measuring at the feeler lever mouth has gas to overflow as air pressure and flow very I;
B. on-the-spot test: in order accurately to record the base plate buried depth of gas-bearing horizon, at first with static pressure equipment feeler lever is pressed into to below ground predetermined depth place, slowly feeler lever is upwards mentioned then, whether check has gas to overflow, if in the process of mentioning when finding to have gas to overflow, then the degree of depth at this place is gas-bearing horizon base plate buried depth; Block feeler lever termination portion in order to prevent earth, can adopt gas cylinder to be pressed into the gas of 1MPa pressure in the feeler lever, close after 3 minutes, adopt BXC-02 inflammable gas detection alarm instrument, in the gas outlet, detect whether inflammable gas is arranged, if any inflammable gas then the degree of depth at this place be gas-bearing horizon base plate buried depth, but as do not have the feeler lever of discovery and put forward the 0.5m-1m duplicate detection once whenever, up to passing the gas-bearing horizon of intending existence, the definite of top board buried depth can consider to determine according to the overlayer of gas-bearing horizon and the concrete geology Information integration of gas-bearing horizon.
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| CN201210013509.0A CN103207417B (en) | 2012-01-17 | 2012-01-17 | Exploration process of superficial layer natural gas |
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| CN201210013509.0A CN103207417B (en) | 2012-01-17 | 2012-01-17 | Exploration process of superficial layer natural gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353426A (en) * | 2015-10-19 | 2016-02-24 | 国家海洋局第二海洋研究所 | Seabed shallow-layer gas detection method based on MIP-CPT technology |
| CN110656926A (en) * | 2019-11-14 | 2020-01-07 | 上海市城市建设设计研究总院（集团）有限公司 | Shallow harmful gas detection device based on drilling equipment and using method thereof |
| CN114109375A (en) * | 2021-11-10 | 2022-03-01 | 中国科学院武汉岩土力学研究所 | Shallow gas formation fine identification method based on resistivity CPTU |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6311132B1 (en) * | 1999-10-06 | 2001-10-30 | Shell Oil Company | Method and apparatus for detecting shallow water flow sands using converted shear waves |
| US6854534B2 (en) * | 2002-01-22 | 2005-02-15 | James I. Livingstone | Two string drilling system using coil tubing |
| US20080142263A1 (en) * | 2006-03-23 | 2008-06-19 | Hall David R | Downhole Valve Mechanism |
-
2012
- 2012-01-17 CN CN201210013509.0A patent/CN103207417B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6311132B1 (en) * | 1999-10-06 | 2001-10-30 | Shell Oil Company | Method and apparatus for detecting shallow water flow sands using converted shear waves |
| US6854534B2 (en) * | 2002-01-22 | 2005-02-15 | James I. Livingstone | Two string drilling system using coil tubing |
| US20080142263A1 (en) * | 2006-03-23 | 2008-06-19 | Hall David R | Downhole Valve Mechanism |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353426A (en) * | 2015-10-19 | 2016-02-24 | 国家海洋局第二海洋研究所 | Seabed shallow-layer gas detection method based on MIP-CPT technology |
| CN110656926A (en) * | 2019-11-14 | 2020-01-07 | 上海市城市建设设计研究总院（集团）有限公司 | Shallow harmful gas detection device based on drilling equipment and using method thereof |
| CN110656926B (en) * | 2019-11-14 | 2024-02-09 | 上海市城市建设设计研究总院（集团）有限公司 | Application method of shallow harmful gas detection device based on drilling equipment |
| CN114109375A (en) * | 2021-11-10 | 2022-03-01 | 中国科学院武汉岩土力学研究所 | Shallow gas formation fine identification method based on resistivity CPTU |
| CN114109375B (en) * | 2021-11-10 | 2023-11-03 | 中国科学院武汉岩土力学研究所 | Shallow gas stratum fine identification method based on resistivity CPTU |
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