CN105353426A - Seabed shallow-layer gas detection method based on MIP-CPT technology - Google Patents
Seabed shallow-layer gas detection method based on MIP-CPT technology Download PDFInfo
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V9/00—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
- G01V9/007—Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00 by detecting gases or particles representative of underground layers at or near the surface
Abstract
The invention relates to a seabed shallow-layer gas detection method based on the MIP-CPT technology. According to the invention, a conventional CPTU probe is additionally provided with an MIP module, thereby enabling organic matters in a ground layer to be continuously decomposed along with the probe and to be diffused through a semi-permeable MIP film during exploration operation when CPTU data is obtained. Then, the organic matters are conveyed to a gas chromatograph on a mother ship, and are detected by a photo ionization detector, a flame ionization detector and a dry-type electrolysis electrical conductivity detector in the gas chromatograph. Testing parameters are obtained through analysis, and the phase state and content condition of organic matters in the ground layer are obtained.
Description
Technical field
The present invention relates to a kind of sea floor exploration field, particularly a kind of submarine shallow gas detection method based on MIP-CPT technology.
Background technology
Submarine shallow gas typically refers to the gas assembled in the sediment composed and exist within below sea bottom surface 1000m.Along with the ocean development activity of day by day rising; submarine soil layer containing shallow gas usually can bring to basic engineering construction and have a strong impact on; even threaten the safety of sea-bottom oil-gas pipeline; but then; because shallow gas is rich in methane, widely distributed, from salt well is dug by China, just there is the history of economic utilization; be a kind of clean energy resource of preciousness, therefore develop submarine shallow gas Detection Techniques and oceanographic engineering safety and Chinese energy safety are all significant.At present, doubtful is all adopt geophysical probing technique to carry out qualitative recognition containing shallow gas stratum, principal mode is find because shallow-layer gas blowout is escaped the slump that causes and depression landforms on sea bottom surface in sea-bed topography measuring process, or runs into signal disturbing Screen theory in stratigraphic section investigation.Confirm that submarine shallow gas can only rely on boring with sampling further if need.Offshore drilling is not only constructed loaded down with trivial details but also with high costs, in addition because prior art is difficult to accomplish continuous fidelity sampling, samples the formation information obtained unsatisfactory.Therefore in the urgent need to new thinking and Technology application are detected in operation in submarine shallow gas.
Modern static sounding (ConePenetrationTesting, CPT) drill compared to tradition, continuous print original position data can be provided high efficiency, low cost, in reality prospecting operation, can with replacing the work of part boring with sampling more than former hole bit quantity far away.In shallow Gas Detection, tested and utilize conventional CPT to divide containing shallow gas sandy soil stratum land, more tentatively determined possible shallow gas distribution range according to the difference of reservoir and cap rock soil nature.
MIP-CPT test is at conventional hole pressure touching methods (PiezoconePenetrationTest, the basis of CPTU) popping one's head in installs film interface detector (MembraneInterfaceProbe additional, MIP) develop, be a kind of novel in-situ testing technique for soil environment, all there is practical significance to the detection operations of submarine shallow gas and the development of following CPT technology.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of low cost, efficient and convenient, the easy to operate submarine shallow gas detection method based on MIP-CPT technology.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
Based on a submarine shallow gas detection method for MIP-CPT technology, comprise the steps:
S1.MIP-CPT underwater unit body is transferred by lash ship and is located sea bottom surface;
S2.MIP-CPT coupling probe is with drilling rod injection seabed;
S3. CPTU data are recorded continuously;
S4., in penetration process, the organism in stratum is continued thermal decomposition by MIP module and is transported in lash ship gas chromatograph;
S5. photoionization detector, flame ionization detector, dry electrolytic electric conductivity detector are respectively continuously to carrying the organism of coming to detect;
S6., after test terminates, drilling rod rises, and underwater unit body moves to next position, hole or is recycled to lash ship.
The present invention by installing MIP module additional on conventional CPTU probe, when making exploration operation, while acquisition CPTU data, organism in stratum to be decomposed and by semi-permeable MIP film diffusion constantly along with probe injection, then be transported in the gas chromatograph on lash ship, and detected respectively by the photoionization detector in chromatograph, flame ionization detector, dry electrolytic electric conductivity detector, by analyzing the test parameter obtained, obtain organism phase and content situation in stratum.
As preferably, MIP-CPT coupling probe is attached to CPTU by MIP module and pops one's head in and formed.Its advantage is, coupling probe is divided into CPTU and MIP two modules, CPTU module is divided into again 4 measurement modules measure respectively, the effect of CPTU module carries out continuous coverage to cone end resistance, side friction, pore water pressure, conductivity 4 geotechnological data in drilling rod penetration process, the effect of MIP module is in drilling rod penetration process, and the organism in formation carries out continuous probe and analyzes.
As preferably, CPTU data comprise cone end resistance, side friction, pore water pressure, conductivity.Its advantage is, on the one hand, single operation can obtain multinomial data; On the other hand, the geological parameter of real-time continuous can be obtained, for the Geological Engineering Epidemiological Analysis on stratum provides accurate information, understand formation conditions.
As preferably, in S4, be carried in gas chromatograph by inert gas along the kapillary in sheathed cable by the organism after the thermal decomposition of MIP module.Its advantage is, gas chromatograph by the organism phase in FID, PID, DELCD tri-kinds of detecting device real-time continuous detection stratum wherein and content, for the Natural Gas Geology Epidemiological Analysis on stratum passes through accurate information.
As preferably, in S5, if the value that flame ionization detector records is more than or equal to 800mV, then represent to there is free gas; If be more than or equal to 200mV to be less than 800mV, then represent to there is 15-30mL/L middle and high concentration dissolved methane; If be more than or equal to 100mV to be less than 200mV, then represent to there is low concentration dissolved methane in 15mL/L.Its advantage is, just can be obtained the existence of free gas, dissolved methane by the value of Main Analysis FID.
As preferably, in S5, if photoionization detector is shown as negative signal, then illustrate to there is free methane gas.Its advantage is, PID has unique low ionization potential to unsaturated compound, meets free methane gas cognition and significantly reduces ionization process, produce the negative signal below baseline.
As preferably, MIP-CPT coupling probe also comprises sample tap, can gather water sample or gas by described sample tap in penetration process.Its advantage is, sample tap can in penetration process at a small amount of water sample of effect down-sampling of reservoir pressure or gas sample for lab analysis, as by the methane concentration in gas, heavy hydrocarbons content and carbon isotope analysis are classified shallow gas judge the origin cause of formation.
CPT of the present invention is static sounding; CPTU is hole pressure touching methods, be CPT one improve hypotype, this MIP-CPT test probe based on CPTU improve, but also can be placed on other CPT pop one's head on improve, therefore the combination of MIP and CPT is totally considered as, instead of combination that is independent and CPTU.
The present invention compared with the existing technology has the following advantages and effect:
1, due to by installing MIP additional, make the organism that just can obtain in the process of probe injection in stratum, and analyze after its thermal decomposition, the data obtained are detected by photoionization detector, flame ionization detector, dry electrolytic electric conductivity detector, after comprehensive analysis, just can identify test section shallow gas containing there is something special, instead of part boring with sampling, save cost, reduce operation complexity, and avoid owing to fidelity sampling and the data brought cannot not there is the problem of reference value.
2, relative to probing means, the present invention has the following advantages:
(1) MIP-CPT test is simple efficient, drastically reduce the area single workload, can drill work by more instrument connection position replacement part;
(2) MIP-CPT Security of test is higher, significantly can reduce the probability of happening of the security incidents such as blowout, bit freezing, breaking of rod bar;
(3) MIP-CPT test environmental protection is with the obvious advantage, does not almost have pollutant emission between operational period;
(4) MIP-CPT test significantly reduces the disturbance of seabed benthic environment and formation testing;
(5) MIP-CPT test jobs is more flexible, can arrange position, next hole in real time according to test result;
(6) data that obtain of in-situ test are more accurate;
(7) ship type requirement to operation boats and ships is relaxed.
3, relative to physical prospecting means, MIP-CPT of the present invention tests the formation information that can obtain in acoustic barrier district.
4, relative to existing means, the data integration advantage of MIP-CPT test of the present invention is given prominence to.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the principle schematic of MIP-CPT of the present invention.
Fig. 2 is that the present invention tests marine site and main MIP-CPT arrangement of boring holes schematic diagram.
Fig. 3 is the shallow section schematic diagram that the present invention tests marine site.
Fig. 4 is PID signal and the FID signal schematic representation of the present invention typical case position, MIP-CPT hole.
Fig. 5 is that the present invention's typical case's position, MIP-CPT hole FID signal and co-located shallow seismic profile contrast schematic diagram.
Fig. 6 is the FID signal maximum distribution schematic diagram of test section 1 of the present invention.
Fig. 7 is the FID signal 3D displaying schematic diagram that the present invention surveys test section 1.
Fig. 8 is the FID signal schematic representation of the present invention typical case position, MIP-CPT hole.
Fig. 9 is top layer qn and the qt curve synoptic diagram of position, MIP-CPT hole of the present invention.
Figure 10 is the multichannel seismic exploration result schematic diagram in test marine site.
Label declaration:
1, sample tap 2, sampling system
3, inert gas 4, EC
5, CPT6, water filling (decline stage)
7, lash ship gas 8, receive gas
9, conductivity detection 10, MIP film
11, side friction detection 12, pore water pressure detection
13, static point resistance detection
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment 1:
Based on a submarine shallow gas detection method for MIP-CPT technology, comprise the steps:
S1.MIP-CPT underwater unit body is transferred by lash ship and is located sea bottom surface;
S2. be attached to CPTU by MIP module and pop one's head in the MIP-CPT coupling probe that formed with drilling rod injection seabed;
S3. record CPTU data continuously, CPTU data comprise cone end resistance, side friction, pore water pressure, conductivity;
S4., in penetration process, the organism in stratum is carried in gas chromatograph along the kapillary in sheathed cable by inert gas after being continued thermal decomposition by MIP module;
S5. photoionization detector, flame ionization detector, dry electrolytic electric conductivity detector are respectively continuously to carrying the organism of coming to detect;
S6., after test terminates, drilling rod rises, and underwater unit body moves to next position, hole or is recycled to lash ship.
In S5, if the value that flame ionization detector records is more than or equal to 800mV, then represent to there is free gas; If be more than or equal to 200mV to be less than 800mV, then represent to there is 15-30mL/L middle and high concentration dissolved methane; If be more than or equal to 100mV to be less than 200mV, then represent to there is low concentration dissolved methane in 15mL/L.
In S5, if photoionization detector is shown as negative signal, then illustrate to there is free methane gas.
As shown in Figure 1, for the principle schematic of the present embodiment, comprise sampling system 2, inert gas 3, EC4, CPT5, water filling (decline stage) 6, lash ship gas 7, receive gas 8, conductivity detection 9, MIP film 10, side friction detection 11, pore water pressure detection 12, static point resistance detects 13 materials and process.
The detailed process of the present embodiment is as follows:
After underwater unit transfers sea bottom surface, MIP-CPT coupling probe is pressed into seabed in company with drilling rod, and in penetration process, cone end resistance, side friction, pore water pressure and conductivity 4 CPTU data record and reach lash ship by MIP-CPT coupling probe continuously.The innovative point installing MIP additional is that the organism in stratum also can be thermal decomposited along with probe injection and constantly by semi-permeable MIP film diffusion, then to be carried in the gas chromatograph on lash ship by inert gas 3 along the kapillary in sheathed cable, 3 kinds of detecting devices: photoionization detector (PhotoIonisationDetector, PID), flame ionization detector (FlameIonisationDetector, and dry electrolytic electric conductivity detector (DryElectrolyticConductivityDetector FID), DELCD) organism carried and come can be detected continuously, the organism information on original position stratum can be obtained while obtaining geotechnological data.Existing research shows, the component of shallow gas is generally the highest with methane content, therefore before actual test at sea, simulated field gaseous environment has carried out laboratory air demarcation, and wherein organic carbon only can identify on FID, and organic chloride can identify on DELCD, and PID has unique low ionization potential to unsaturated compound, meet free methane gas cognition and significantly reduce ionization process, produce the negative signal below baseline, as shown in table 1.
Table 1: methane gas concentration is demarcated
One, selected test section and cloth apertured position:
As shown in Figure 2, the marine test section of the present embodiment is positioned at East Sea Zhoushan sea area, belong to Fujian-community, the south of the Five Ridges, Zhejiang, In The Western Part of The East China Sea sea area, define the Quaternary period Southeastern Zhejiang Province terrestrial facies loose fines deposition and strand, side, northwest, East Sea sea-land interbedding facies, marine facies flusch.According to areal geology data, Late Quaternlary stratum, test section can be divided into group and Holocene series on upper Pleistocene series, and Holocene series can be subdivided into lower Holocene series Ji Gujiao group, middle Holocene series root of Beijing euphorbia mountain group and upper Holocene series Shengsi group.
Test section mean depth about 30 meters, sea bottom surface is smooth but trend is comparatively powerful, and MIP-CPT underwater unit need be selected a good opportunity into water according to trend rule.As shown in Figure 2, on-the-spot test is divided into two blocks: outer ring, test section 1 represents the acoustic signals white space observed in geophysics prospecting in early stage (shallow seismic profile investigation), and inner ring represents seabed sunk area.On the basis analyzing geophysics prospecting data, laid as follows position, MIP-CPT hole: as shown in Figure 2, position, 11 holes has been laid in test section 1, and position, 4 holes has been laid in test section 2, basic uniform fold test zone.As can be seen from Figure 3, acoustic signals white space continues up to middle Holocene series stratum (Q
4 2), until beyond the penetration depth of signal, visible geophysical method is difficult to know the formation information in acoustic signals shielding area; Test section 2 is positioned at test section 1 east southeast about 10 km, also detects the existence of doubtful shallow gas in early stage in geophysics prospecting.
Two, based on the shallow gas identification of MIP-CPT data
As shown in Figure 4, can see that the FID signal in ZK2 hole is increased to maximal value 700mV by under sea bottom surface 0.5m place gradually, the dissolved methane that all there is high concentration along road is described, then to jump out range (>5V) in 25m place response voltage, identify free methane gas, again according to the response voltage decline situation at 29.4m place, at least thick 4.4m of gas-bearing horizon can be judged; Equally also be containing pore, being arranged in ZK2 hole Nan Xi, to be about the FID signal of the ZK4 hole methane of 70m similar to ZK2 hole, almost all there is the dissolved methane of high concentration in whole hole depth, but in 17.5-23.1m and 25.0m to hole termination depth two hole sections, there occurs FID signal increase severely and PID signal disconnection phenomenon, the free gas-bearing formation of existence two different depths is described, analyze the layout of position, hole, that layer of free gas that ZK4 hole is darker can be found out and the free gas that ZK2 hole finds should be same layer and gas-bearing formation lower bound can more than the hole termination depth in ZK4 hole.Study the position, two holes not identifying free gas again, after the probe injection of ZK8 hole, FID signal steadily rises to 600mV, does not occur that FID signal is greater than 800mV and PID signal and becomes situation about bearing, illustrates only there is high concentration dissolved methane; And ZK6 hole until under sea bottom surface 18m place rise just produce faint FID signal, illustrate that ZK6 hole only has the dissolved methane of low concentration to be present in deep formation, this to analysis shallow gas source significant.
As shown in Figure 5, the FID signal of above described holes position and the shallow seismic profile of co-located are compared, can know and see in the acoustic signals white space all under depressed area, seabed of ZK2 hole, ZK4 hole and have identified free gas, the concentration change of dissolved methane and the concentration of stratum middle-shallow layer gas higher, signal dispersion, reflection stronger, decay more rapidly acoustic propagation rule match; Be positioned at the ZK8 hole at edge, depressed area, seabed and the ZK6 hole outside acoustic signals white space equally also to demonstrate in the interrupted trace regions of acoustic signals (acoustics curtain) situation that dissolved methane relative concentration is higher.But also find simultaneously, MIP-CPT does not almost identify free gas in the blank upper area of acoustic signals, in conjunction with correlative study analysis, think when CPT data show soil of the same race, comparatively understratum porosity is better for sound wave white space upper formation, gas escape is relatively very fast, and the geophysics prospecting testing marine site compares MIP-CPT test 1 year ahead of time, free gas distribution under sea bottom surface changes, and sub-bottom profiler is very responsive to sonic velocity change, in sediment, air content reaches 1% and just can cause change of reflection.
Sum up the result of detection of all the other positions, hole, at 11 Kong Weizhong of test section 1, be positioned at depressed area, seabed except identifying except free gas in ZK2 hole, ZK4 hole, ZK11 hole has found the dissolved methane of high concentration, the thick free gas-bearing formation of about 0.6m is identified at 17m place under sea bottom surface, ZK7 hole at edge, south, depressed area, seabed, although distance ZK2 hole, ZK4 hole are comparatively far away, there is the similar orphan of the gas-bearing formation that to dissociate to top, ZK4 hole and be suspended from form in high concentration dissolved methane; In addition be arranged in outside depressed area, seabed, the position, hole of acoustic signals white space (between Fig. 2 Internal and external cycle) all exists dissolved methane to high concentration, be positioned at ZK3 hole and the ZK9 hole of acoustic signals white space outer (Fig. 2 outer ring outside), all only the dissolved methane of concentration in deep layer display existence is low to moderate.The position, 4 holes of test section 2 is all arranged in the sea bed depressed area and acoustic signals white space that early stage, geophysics prospecting was delimited, and all only identifies dissolved methane.As shown in Figure 6, Figure 7, the FID signal of test section 1 is carried out solid show, the overall distribution of free gas and dissolved methane under the sea bottom surface of test section 1 can be found out intuitively.
Therefore, it is feasible for MIP-CPT technology being applied to submarine shallow gas detection, shallow gas recognition result meets the conclusion of geophysics prospecting in early stage substantially, overcome the shortcoming that geophysical method is difficult to know formation information in acoustic signals shielding area, embody the advantage of in-situ testing technique.
Three, based on the further analysis of MIP-CPT data
Another advantage that several data is MIP-CPT can be obtained, such as in conjunction with CPTU data, MIP data are further analyzed, just can know the more formation information in test marine site.
First the distribution situation of two kinds of dissolved methanes inside and outside depressed area, seabed is analyzed.For the ZK2 hole of the FID signal combination Fig. 4 in the ZK11 hole in Fig. 8, ZK12 hole, ZK4 hole in depressed area, seabed, dissolved methane closely sea bottom surface, has almost been covered with formation testing; For the ZK6 hole of the FID signal combination Fig. 4 in ZK1 hole, ZK7 hole in Fig. 8, ZK8 hole outside depressed area, seabed, all that MIP-CPT pops one's head in after injection certain depth and just detects dissolved methane, can find with reference to Fig. 6, away from depressed area, seabed and acoustic signals white space, it is larger to there is the degree of depth in dissolved methane initial.The common ground distributed by two kinds of dissolved methanes, the concentration and the depth of stratum that can be observed dissolved methane are proportionate substantially, therefore inferring has more shallow gas to preserve in depths, stratum, test section 1, the methane dissolved is all that shallow gas stays along journey from the process that deep layer is upwards migrated, and the Methane solubility that concentration causes along with upwards migrate gas flow body posture and upper overburden layer pressure reduce reduces and reduces, because the spray ease of fluid (possibility also not all is gas) causes, pore water pressure reduces final sea bottom surface, effective stress increases and caves in, formation pockmark.
This supposition of Data support of CPTU: homogeneous to the soil nature in the depth range of about 30 meters, whole hole from sea bottom surface, be mainly marine facies silty clay and clay, clay intensity is very soft to slightly hard, sediment overall permeability is low, and one of feature of shallow gas is exactly in the sediment that perviousness is low, can vertically upwards migrate; In addition test data is not had to show containing the situation of obvious layer of sand, phacoid or excess pore water pressure in single section, so infer that the free gas of " lonely outstanding " that ZK4 hole and ZK7 hole find is the phase-state change that shallow gas causes because there is degree of freedom change when upwards migrating.
Sea bottom surface is because of the cone end resistance curve of evidence from CPTU that pore water pressure reduces, effective stress increase causes depression, and according to engineering geology handbook, the cone end resistance of cohesive soil undrained shear strength and CPTU has following relation:
In formula: q
tfor pressing revised cone end resistance (MPa) through via hole; δ
v0for on cover total earth pressure (MPa); N
ktfor conehead coefficient, typical N
ktvalue scope 4 ~ 30, this tests value 20; q
nfor only boring end resistance (MPa).
Fig. 9 by above mention (solid line) and (dotted line) curve under the sea bottom surface of porose position within 5m by whether classifying in depressed area, seabed, can find out that the value of position, hole in the 2m of top layer in depressed area, seabed is obviously greater than outside depressed area, seabed, therefore according to formula (1), veneer of soil undrained shear strength in depressed area, seabed is relatively high, according to principles of soil mechanics, because effective stress in soil increases, soil classifiction also can correspondingly improve, and illustrates in depressed area, seabed and fluid spray ease process occurred really.
The multichannel seismic exploration result in last contrast test marine site, the penetration thickness of its energy is far longer than sub-bottom profiler as can be seen from Figure 10, can reach more than 260m.Wherein under sea bottom surface, have an obvious reflecting interface between 160-200m, this interface has larger Characteristic fluctuation, and according to areal geology data, this interface should be the end reflecting interface of Quaternary Strata.Shallow gas still exists the signal disturbing shielding action below the sunk area of seabed, but seismic event has penetrated the shallow gas end face that sub-bottom profiler does not penetrate, can know that seeing upwards migrates because of shallow gas and cause the seismic event multilated of normal succession of strata and the column acoustic disturbance produced, circumstantial evidence test section 1 shallow gas is mainly derived from the supposition compared with deep formation.Therefore, if the feeler inspection degree of depth of MIP-CPT test increases, will position, more hole be had present the FID signal situation in ZK2 hole in similar Fig. 4, illustrate that needing to carry out the darker MIP-CPT of the feeler inspection degree of depth in test marine site tests.
Embodiment 2:
The present embodiment is similar to embodiment 1, and its difference is: MIP-CPT coupling probe also comprises sample tap 1, can gather water sample or gas by sample tap 1 in penetration process.
The MIP-CPT test data that the scene of the present invention is based on obtains, identifies the free shallow gas in below East Sea Zhoushan sea area sea bottom surface 30 meters and dissolved methane, and its result totally meets geophysics in earlier stage and reconnoitres the conclusion drawn.Think after MIP-CPT data are further analyzed, the shallow gas in test marine site is mainly derived from the stratum compared with deep, and obtain the circumstantial evidence of multichannel seismic exploration result, therefore, combine probing to be with a wide range of applications in submarine shallow gas detects with the MIP-CPT technology of physical prospecting advantage.
In addition, it should be noted that, the specific embodiment described in this instructions, the shape, institute's title of being named etc. of its parts and components can be different.All equivalences of doing according to structure, feature and the principle described in inventional idea of the present invention or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (7)
1., based on a submarine shallow gas detection method for MIP-CPT technology, it is characterized in that, comprise the steps:
S1.MIP-CPT underwater unit body is transferred by lash ship and is located sea bottom surface;
S2.MIP-CPT coupling probe is with drilling rod injection seabed;
S3. CPTU data are recorded continuously;
S4., in penetration process, the organism in stratum is continued thermal decomposition by MIP module and is transported in lash ship gas chromatograph;
S5. photoionization detector, flame ionization detector, dry electrolytic electric conductivity detector are respectively continuously to carrying the organism of coming to detect;
S6., after test terminates, drilling rod rises, and underwater unit body moves to next position, hole or is recycled to lash ship.
2. the submarine shallow gas detection method based on MIP-CPT technology according to claim 1, is characterized in that: described MIP-CPT coupling probe is attached to CPTU probe by MIP module and is formed.
3. the submarine shallow gas detection method based on MIP-CPT technology according to claim 1, is characterized in that: described CPTU data comprise cone end resistance, side friction, pore water pressure, conductivity.
4. the submarine shallow gas detection method based on MIP-CPT technology according to claim 1, is characterized in that: in described S4, is carried in gas chromatograph along the kapillary in sheathed cable by the organism after the thermal decomposition of MIP module by inert gas.
5. the submarine shallow gas detection method based on MIP-CPT technology according to claim 1, is characterized in that: in described S5, and the value (response voltage) that flame ionization detector records if be more than or equal to 800mV, then represents to there is free methane gas; If be more than or equal to 200mV to be less than 800mV, then represent to there is 15-30mL/L middle and high concentration dissolved methane; If be more than or equal to 100mV to be less than 200mV, then represent to there is low concentration dissolved methane in 15mL/L.
6. the submarine shallow gas detection method based on MIP-CPT technology according to claim 5, is characterized in that: in described S5, if photoionization detector is shown as negative signal, then illustrates to there is free methane gas.
7. the submarine shallow gas detection method based on MIP-CPT technology according to claim 1, is characterized in that: described MIP-CPT coupling probe also comprises sample tap, can gather water sample or gas by described sample tap in penetration process.
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