CN104459823A - Method for testing sea breach interface through comprehensive geophysical prospection - Google Patents
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Abstract
The invention discloses a method for testing a set breach interface through comprehensive geophysical prospection. The method combines a geophysical prospection method and a sampling test method, namely a high-density electrical method, resistivity logging and in-hole layered water sampling analysis method are adopted, the relationship between a resistivity and a sea breach is established step by step, and then the sea breach interface is delimited in a quantitative mode according to the relationship. The method combines two geophysical prospecting technologies of the high-density electrical method and the electrical logging method. Detection of the sea breach interface is achieved by combining drilling sampling and water quality analysis, work efficiency is greatly improved, and detection work can be rapidly completed by means of rapid detection through the high-density electrical method; the accuracy is guaranteed, and principally, the relationship between the resistivity feature and the sea breach amount is established through a result comparison of two kinds of geophysical prospection and in-hole layered water sampling; the detection of evenness of stratums is achieved, and the comprehensive benefits are good.
Description
Technical field
The present invention relates to a kind of complex geophysical prospecting test seawater and invade interfacial process, a kind of specifically associating physical prospecting and sampling and testing method, namely stratified sampling of water analysis means in high-density electric, resistivity logging and hole is taked, distribution set up resistivity value and seawater invades between relation, come quantitatively to divide seawater intrusion interface thus.
Background technology
At present along with coastal economy development, coastal frontier construction scale of projects continues to increase, and wherein coastal frontier underground water and soil invades the investment that the corrosion problems caused directly affects engineering construction because of seawater.The automatic monitoring system of current domestic existing seawater intrusion scope, though can solve seawater intrusion interface problem, the foundation of monitoring system is especially loaded down with trivial details, sometimes requirement of engineering infill lines and ensure detection accuracy, this just needs a large amount of inputs, directly affects project progress and cost.
Summary of the invention
In order to solve problem above, the object of the invention is to the present invention and being intended to study a kind of complex geophysical prospecting detection method, thus increasing work efficiency, reduce implementation cost, still can solve stratum homogeneity detection problem in addition.
The present invention to fetch earth water test Comprehensive Correlation Detection Techniques in conjunction with layering in high-density electric, electric logging and hole, determines that high-density electric, electric logging resistivity and seawater invade standard, and then invades interface to seawater and divide fast.Comprise: high-density electric survey line (point) layout, high-density electric test job, boring (electric logging) and water intaking soil sample are arranged, sampling and testing and electric logging test, set up foundation soil high-density electric and Method of Electrical Wells various soil layer resistivity under fresh water condi, determine to reach the content such as foundation soil high-density electric and the various soil layer resistivity of Method of Electrical Wells under the above condition of moderate corrosion by seawater influence corrosivity.
A kind of complex geophysical prospecting test seawater provided by the invention invades interfacial process, it is characterized in that, said method comprising the steps of:
A. a high-density electric turnkey shoot line/layout: the vertical seashore of test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, adopt the measuring point spacing being suitable for high-density electric testing tool resolution, in order to by via High-density Resistivity Method formation conductivity distribution situation, boring/electric logging and water intaking soil sample is instructed to arrange;
B. high-density electric test: carry out high density electrical testing, obtains high-density electric test resistance rate section, to obtain the resistivity distribution situation in subsurface formations, uses and divide stratum, judge abnormal;
C. electric logging and water intaking soil sample are arranged: according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, and Sampling Distance is determined according to resistivity profile, with control survey precision;
D. sampling and testing and electric logging test: should simple and easy drawing water be carried out before resistivity logging and stratified pumping in hole, remove artificial drilling fluid to underground water mitigation; Water sample carries out simple analytical test, and soil sample carries out lyotropic salt analysis, and carries out electric logging in hole, obtains well logging resistivity histogram and high-density electric, relation between electric logging resistivity and stratified pumping water quality medium content;
E. fresh water condi high-density electric and electrical logging soil layer resistivity standard is set up: layering statistics is not by seawater influence district high-density electric and each soil layer resistivity value of electrical logging, by contrasting with probing stratified pumping soil sample test analysis result, set up foundation soil high-density electric and electrical logging various soil layer resistivity standard under fresh water condi;
F. set up seawater and invade condition high-density electric and electrical logging soil layer resistivity standard: comparative analysis reaches the above high-density electric of moderate corrosion by seawater influence, relation between electric logging resistivity and stratified pumping Korrosionsmedium content, set up seawater and invade high-density electric and the criterion of electric logging resistivity;
G. divide seawater and invade interface
Divide seawater in the horizontal and vertical directions according to high-density electric and electrical logging and invade interface, electrical logging is in order to the measurement of point, high-density electric is in order to the measurement of resistivity profile, point measured by described two methods combining, face aggregation of data are got up, mark off the spatial shape at interface, and according to high-density electric assay foundation soil soil layer situation of change.
The vertical seashore of preferred described test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, should not be less than 300m, measuring point spacing 3 ~ 5m.
Preferred described electric logging and water intaking soil sample arrange it is according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, Sampling Distance is the sampling of 1.5 ~ 2m spacing, in resistivity significant change section encryption sampling, by 0.5 ~ 1.0m sampling, with control survey precision.
Preferred described seawater invades high-density electric and the criterion of electric logging resistivity is high-density electric: seawater <10 Ω m; Fresh water > 10 Ω m; Electric logging: seawater <5 Ω m; Fresh water > 5 Ω m.
The present invention combines " high-density electric " and " electric logging " two kinds of geophysical prospecting technologies, and in conjunction with boring with sampling and water analysis, solve seawater intrusion interface detection problem, its advantage have following some: (1) greatly increase work efficiency, the quick detection by means of high-density electric can complete detection operations fast; (2) accuracy is guaranteed, and mainly adopts stratified pumping in two kinds of physical prospecting comparing results and hole to set up the relation between electrical resistivity property and seawater intrusion volume; (3) solve stratum homogeneity detection problem, comprehensive benefit is good.In sum, high-density electric, resistivity logging and boring stratified pumping soil sample analysis-by-synthesis technique invade interface field of detecting at seawater and have good using value, are especially applicable to the etching problem that coastal engineering construction evaluation seawater intrusion causes.
Accompanying drawing explanation
A kind of complex geophysical prospecting test of Fig. 1 the present invention seawater invades interfacial process resistivity survey line section;
A kind of complex geophysical prospecting test of Fig. 2 the present invention seawater invades interfacial process electric logging histogram.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed.
A kind of complex geophysical prospecting test seawater invades interfacial process: it is characterized in that said method comprising the steps of:
A. a high-density electric turnkey shoot line/layout: the vertical seashore of test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, adopt the measuring point spacing being suitable for high-density electric testing tool resolution, in order to by via High-density Resistivity Method formation conductivity distribution situation, boring/electric logging and water intaking soil sample is instructed to arrange;
B. high-density electric test: carry out high density electrical testing, obtains high-density electric test resistance rate section, to obtain the resistivity distribution situation in subsurface formations, uses and divide stratum, judge abnormal;
C. electric logging and water intaking soil sample are arranged: according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, and Sampling Distance is determined according to resistivity profile, with control survey precision;
D. sampling and testing and electric logging test: should simple and easy drawing water be carried out before resistivity logging and stratified pumping in hole, remove artificial drilling fluid to underground water mitigation; Water sample carries out simple analytical test, and soil sample carries out lyotropic salt analysis, and carries out electric logging in hole, obtains well logging resistivity histogram and high-density electric, relation between electric logging resistivity and stratified pumping water quality medium content;
E. fresh water condi high-density electric and electrical logging soil layer resistivity standard is set up: layering statistics is not by seawater influence district high-density electric and each soil layer resistivity value of electrical logging, by contrasting with probing stratified pumping soil sample test analysis result, set up foundation soil high-density electric and electrical logging various soil layer resistivity standard under fresh water condi;
F. set up seawater and invade condition high-density electric and electrical logging soil layer resistivity standard: comparative analysis reaches the above high-density electric of moderate corrosion by seawater influence, relation between electric logging resistivity and stratified pumping Korrosionsmedium content, set up seawater and invade high-density electric and the criterion of electric logging resistivity;
G. divide seawater and invade interface
Divide seawater in the horizontal and vertical directions according to high-density electric and electrical logging and invade interface, electrical logging is in order to the measurement of point, high-density electric is in order to the measurement of resistivity profile, point measured by described two methods combining, face aggregation of data are got up, mark off the spatial shape at interface, and according to high-density electric assay foundation soil soil layer situation of change.
The vertical seashore of preferred described test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, should not be less than 300m, measuring point spacing 3 ~ 5m.
Preferred described electric logging and water intaking soil sample arrange it is according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, Sampling Distance is the sampling of 1.5 ~ 2m spacing, in resistivity significant change section encryption sampling, by 0.5 ~ 1.0m sampling, with control survey precision.
Preferred described seawater invades high-density electric and the criterion of electric logging resistivity is high-density electric: seawater <10 Ω m; Fresh water > 10 Ω m; Electric logging: seawater <5 Ω m; Fresh water > 5 Ω m.
This method is in East Sea Island, Zhanjiang City, and survey region of bordering on the sea, the north, district and implement, below in conjunction with embodiment, the present invention is described in detail.This Geophysical Work place is in East Sea Island, Zhanjiang City, and survey district's landform and mainly belong to seabeach landforms, ground is more smooth.Surveying master stratum in district is: top layer for banketing, mud, centre is clay and detail coarse sands layer interbedded formation, is rich in underground water in layer of sand.Clay seam is water-resisting layer, plays water proof, sealing and the effect of enrichment water.A high-density electric turnkey shoot line/layout: the vertical seashore of test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, adopt reasonable measuring point spacing, this rational spacing is determined in conjunction with actual conditions by the distance of precision mainly between surveying instrument electrode of resolution i.e. high-density electric testing tool, fundamental purpose is first by via High-density Resistivity Method formation conductivity distribution situation, instructs boring/electric logging and water intaking soil sample to arrange; High-density electric amounts to 6 surveys line, length 5220m; Electric logging amounts to 53 holes, depth-logger 1873m.Specific works amount refers to table 1, table 2.
Table 1 high-density electric quantity sheet
Table 2 electric logging quantity sheet
High-density electric test job: carry out the work of high density electrical testing, obtain high-density electric test resistance rate section, just can obtain the resistivity distribution situation in subsurface formations, thus can divide stratum, judgement is abnormal; The measuring principle of resistivity: known by physics, the current potential of any point in point source current field
the distance (known) of I-strength of current (known) r-this point-to-point power supply.Therefore only need to know current potential U, just can in the hope of the numerical value of resistivity R.The measuring principle of conventional electrical survey (ES): electrode system A, M, M or M of being made up of transmitting electrode and potential electrode, A, B are put into well and another electrode N or B is placed on surface mud pond, as receiving loop electrode, electrode system is wanted to be connected with ground power supply and registering instrument by cable.When electrode system supplies electric current I by electrodes of A, M when moving to well head in well.Measure the potential difference (PD) △ U between M, N electrode
mNpotential difference (PD) can be converted to stratum formation apparent resistivity Ra by surface recorder can be obtained by derivation
K is K factor, the distance dependent in its size and electrode system between three electrodes.As shown in Figure 1, be resistivity Profile of survey line.
Electric logging and water intaking soil sample are arranged: according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, and Sampling Distance is determined according to resistivity profile, with control survey precision.This time physical prospecting exploration high-density electric arranges 6 surveys line altogether, and some distance is 5m.Electric logging detection boring to be arranged on the survey line of high-density electric, wherein measures in two batches, and early stage, drilling depth was more shallow, and at about 30m, later stage boring is comparatively dark, for 50m-60m not etc.Sampling and testing and electric logging test: should simple and easy drawing water be carried out before resistivity logging and stratified pumping in hole, remove artificial drilling fluid to underground water mitigation; Water sample carries out simple analytical test, and soil sample carries out lyotropic salt analysis, and carries out electric logging in hole, obtains well logging resistivity histogram and high-density electric, relation between electric logging resistivity and stratified pumping water quality medium content; Be illustrated in figure 2 electric logging histogram.Table 3 is high-density electric, relation between electric logging resistivity and corrosion property content
Set up fresh water condi high-density electric and electrical logging soil layer resistivity standard: layering statistics is not by seawater influence district high-density electric and each soil layer resistivity value of electrical logging, by contrasting with probing stratified pumping soil sample test analysis result, set up foundation soil high-density electric and electrical logging various soil layer resistivity standard under fresh water condi; Measured value in table 4, fresh water condi high-density electric and electrical logging soil layer resistivity standard.
Table 3 high-density electric, relation between electric logging resistivity and corrosion property content
Table 4 fresh water condi high-density electric and electrical logging soil layer resistivity standard
Set up seawater and invade condition high-density electric and electrical logging soil layer resistivity standard: comparative analysis reaches the above high-density electric of moderate corrosion by seawater influence, relation between electric logging resistivity and stratified pumping Korrosionsmedium content, set up seawater and invade high-density electric and the criterion of electric logging resistivity; Seawater invades high-density electric and the criterion of electric logging resistivity: high-density electric: seawater <10 Ω m; Fresh water > 10 Ω m; Electric logging: seawater <5 Ω m; Fresh water > 5 Ω m.
The result of two kinds of methods is still relatively coincide on the whole, and can measure electrical parameter comparatively exactly, the conclusion therefore drawn is relatively reliable.Draw relatively consistent conclusion, fundamental measurement has inferred plane and the Soil profile situation of place marine denudation, draws the marine denudation degree of depth within the scope of survey line, infers to obtain out-of-plane marine denudation scope.Due to the limitation of geophysical prospecting method, the conclusion drawn has certain deviation, uses water intaking to do other means such as water analysis simultaneously add their confirmation and prove at physical prospecting survey line and boring region.
Divide seawater and invade interface: divide seawater in the horizontal and vertical directions according to high-density electric and electric logging and invade interface, electrical logging relative accuracy is higher, but mainly concentrates on a bit, accurate not to space boundary division; It is resistivity profile that high-density electric records, and two methods combining just better can mark off the spatial shape at interface.In addition still can according to high-density electric assay foundation soil soil layer situation of change.
The present invention combines " high-density electric " and " electric logging " two kinds of geophysical prospecting technologies, and in conjunction with boring with sampling and water analysis, solve seawater intrusion interface detection problem, its advantage have following some: (1) greatly increase work efficiency, the quick detection by means of high-density electric can complete detection operations fast; (2) accuracy is guaranteed, and mainly adopts stratified pumping in two kinds of physical prospecting comparing results and hole to set up the relation between electrical resistivity property and seawater intrusion volume; (3) solve stratum homogeneity detection problem, comprehensive benefit is good.In sum, high-density electric, resistivity logging and boring stratified pumping soil sample analysis-by-synthesis technique invade interface field of detecting at seawater and have good using value, are especially applicable to the etching problem that coastal engineering construction evaluation seawater intrusion causes.
The foregoing is only the detailed description of specific embodiment of the invention scheme, do not limit the present invention with this, all do in mentality of designing of the present invention any amendment, equivalent to replace and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. complex geophysical prospecting test seawater invades an interfacial process, it is characterized in that said method comprising the steps of:
A. a high-density electric turnkey shoot line/layout: the vertical seashore of test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, adopt the measuring point spacing being suitable for high-density electric testing tool resolution, in order to by via High-density Resistivity Method formation conductivity distribution situation, boring/electric logging and water intaking soil sample is instructed to arrange;
B. high-density electric test: carry out high density electrical testing, obtains high-density electric test resistance rate section, to obtain the resistivity distribution situation in subsurface formations, uses and divide stratum, judge abnormal;
C. electric logging and water intaking soil sample are arranged: according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, and Sampling Distance is determined according to resistivity profile, with control survey precision;
D. sampling and testing and electric logging test: should simple and easy drawing water be carried out before resistivity logging and stratified pumping in hole, remove artificial drilling fluid to underground water mitigation; Water sample carries out simple analytical test, and soil sample carries out lyotropic salt analysis, and carries out electric logging in hole, obtains well logging resistivity histogram and high-density electric, relation between electric logging resistivity and stratified pumping water quality medium content;
E. fresh water condi high-density electric and electrical logging soil layer resistivity standard is set up: layering statistics is not by seawater influence district high-density electric and each soil layer resistivity value of electrical logging, by contrasting with probing stratified pumping soil sample test analysis result, set up foundation soil high-density electric and electrical logging various soil layer resistivity standard under fresh water condi;
F. set up seawater and invade condition high-density electric and electrical logging soil layer resistivity standard: comparative analysis reaches the above high-density electric of moderate corrosion by seawater influence, relation between electric logging resistivity and stratified pumping Korrosionsmedium content, set up seawater and invade high-density electric and the criterion of electric logging resistivity;
G. divide seawater and invade interface
Divide seawater in the horizontal and vertical directions according to high-density electric and electrical logging and invade interface, electrical logging is in order to the measurement of point, high-density electric is in order to the measurement of resistivity profile, point measured by described two methods combining, face aggregation of data are got up, mark off the spatial shape at interface, and according to high-density electric assay foundation soil soil layer situation of change.
2. a kind of complex geophysical prospecting test seawater according to claim 1 invades interfacial process, it is characterized in that: the vertical seashore of described test section high density electrical measurement line is arranged, length should exceed beyond the obvious influence zone of seawater, should not be less than 300m, measuring point spacing 3 ~ 5m.
3. a kind of complex geophysical prospecting test seawater according to claim 1 invades interfacial process, it is characterized in that: described electric logging and water intaking soil sample arrange it is according to high density electricity resistivity profile, select coastal frontier and arrange away from coastal frontier to be no less than two borings, Sampling Distance is the sampling of 1.5 ~ 2m spacing, in resistivity significant change section encryption sampling, by 0.5 ~ 1.0m sampling, with control survey precision.
4. a kind of complex geophysical prospecting test seawater according to claim 1 invades interfacial process, it is characterized in that: described seawater invades high-density electric and the criterion of electric logging resistivity is high-density electric: seawater <10 Ω m; Fresh water > 10 Ω m; Electric logging: seawater <5 Ω m; Fresh water > 5 Ω m.
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| CN107478392A (en) * | 2017-09-21 | 2017-12-15 | 河海大学 | Based on radon isotope it is coastal enter drainage gate facility leakage detection method |
| CN108180013A (en) * | 2017-12-29 | 2018-06-19 | 中国石油天然气股份有限公司 | A kind of edge water gas reservoir water enchroachment (invasion) discriminating direction method |
| CN108532533A (en) * | 2018-04-13 | 2018-09-14 | 梁新 | Governing system and construction method of the underground water by inwelling |
| CN111158066A (en) * | 2020-01-07 | 2020-05-15 | 江苏海洋大学 | Method for comprehensively monitoring invasion of seawater into sandstone aquifer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108180013B (en) * | 2017-12-29 | 2021-04-30 | 中国石油天然气股份有限公司 | Method for judging water invasion direction of boundary water-gas reservoir |
| CN108532533A (en) * | 2018-04-13 | 2018-09-14 | 梁新 | Governing system and construction method of the underground water by inwelling |
| CN111158066A (en) * | 2020-01-07 | 2020-05-15 | 江苏海洋大学 | Method for comprehensively monitoring invasion of seawater into sandstone aquifer |
| CN111158066B (en) * | 2020-01-07 | 2021-11-09 | 江苏海洋大学 | Method for comprehensively monitoring invasion of seawater into sandstone aquifer |
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