CN108427657A - A kind of underground water-seal oil depot water curtain system efficiency analysis and regulation and control method - Google Patents
A kind of underground water-seal oil depot water curtain system efficiency analysis and regulation and control method Download PDFInfo
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Abstract
The invention discloses a kind of underground water-seal oil depot water curtain system efficiency analysis and regulation and control method, the method for judging water curtain system validity by analyzing different zones water sample with water curtain system water supply Features of Hydrochemistry similitude, and water curtain system being regulated and controled by adjusting water curtain water supply quality.This method acquisition underground water water sample and carries out Chemical characteristic analysis before Oil Depot Construction, in building and after building up at different location, classify to the Features of Hydrochemistry of water sample in conjunction with clustering and the method for principal component analysis, obtain the hydraulic connection situation between the underground water at the water curtain system water supply of the areas Ku Zhi and different location, and then whether the water curtain system that can be accurately judged to underground water-seal oil depot can effectively run, and water curtain system is regulated and controled for water constituent by adjusting water curtain according to analysis result.The invention proposes a kind of underground water-seal oil depot water curtain system efficiency analysis based on Hydrochemistry of The Groundwater and regulation and control method.
Description
Technical field
The present invention relates to it is a kind of analysis with regulation and control underground water-seal oil depot water curtain system validity method, specifically one
Kind is passed through based on the groundwater hydrochemical characteristics of the areas underground water-seal oil depot Ku Zhi different parts and is analyzed different parts underground water
Features of Hydrochemistry similitude judges whether water curtain system water supply can cover entire reservoir area, and according to the chemical reaction pair of generation
The method that water curtain system performance is regulated and controled.The invention belongs to underground engineering fields.
Background technology
With economy and social development, the demand of oil increasingly increases, and it is significant to carry out oil reserve.In oil
It lays in various modes, underground water-seal oil depot has the characteristics that take up little area, large storage capacity and safe, therefore has obtained increasingly
It is widely applied.Underground water-seal oil depot oil storage function is established on following 3 basic conditions：1) oil relative density is less than
Water；2) oil is met water and is not decomposed, and does not dissolve；3) hydraulic pressure is more than storage pressure around oil depot.In oil storage, underground water-seal oil depot relies on water
Curtain system prevents oil from revealing.Therefore, evaluation water curtain system Usefulness Pair has most important in the safe and stable operation of oil depot
Effect.But also lack effective technological means at present.
Invention content
To solve problem of the prior art, it is a primary object of the present invention to build a kind of ground with high application value
Lower water seal oil depot water curtain system efficiency analysis and regulation and control method.
This method acquisition underground water water sample and carries out water chemistry before Oil Depot Construction, in building and after building up at different location
Signature analysis classifies to the Features of Hydrochemistry of water sample in conjunction with clustering and the method for principal component analysis, obtains the areas Ku Zhi
The hydraulic connection situation between underground water at water curtain system water supply and different location, and then underground water seal can be accurately judged to
Whether the water curtain system of oil depot can effectively run, and according to analysis result by adjusting water curtain for water constituent to water curtain system into
Row regulation and control.
The purpose of the present invention is achieved through the following technical solutions：
A kind of underground water-seal oil depot water curtain system efficiency analysis method, specifically includes following steps：
(1) sample collection：Rock sample and underground water water sample are acquired respectively according to the sample time and sample point that determine,
It can reflect the areas oil depot Ku Zhi geologic feature.
(2) sample detection：XRD (X-ray diffraction) is carried out to the rock sample of acquisition to analyze, to obtain the areas Ku Zhi rock
Mineral composition is reacted according to the water chemistry that the mineral composition ingredient of rock and region hydrogeology condition judgment may occur, is come
Choose adaptable water sample detection index.
(3) data analysis：It is combined using two kinds of mathematical statistics methods of clustering and principal component analysis, very by correlation
High water sample detection index, which is converted to, to be mutually independent or incoherent new variables, is obtained water sample principal component, is drawn each underground
The scatter plot of water sample principal component, and major influence factors are obtained, it is dissolving and the seepage flow of underground water of rock respectively.To principal component
Sample point on scatter plot is grouped, and the closer point in position on principal component scatter plot is classified as one group.
(4) water curtain validity discussion：Water curtain water supply Features of Hydrochemistry is analyzed, analysis and water curtain water supply Features of Hydrochemistry are passed through
Similar sample point distribution situation judges water curtain system validity.
According to technical solution above, in the case of preferred, before Oil Depot Construction, the water sample is adopted for the rock sample acquisition
Collection should be carried out before Oil Depot Construction, in building and after putting into operation respectively, can be reflected and be descended Hydrochemical variation feature in the entire process.
According to technical solution above, in the case of preferred, the sample time should avoid in the gas such as storm period and dry spell
Wait abnormal period sampling.The water sampling process should be completed in 1~3 day, to avoid no longer effective property to be tied to analysis
Fruit has adverse effect on.
According to technical solution above, in the case of preferred, the sample point is geohydrologic unit, bad fault body, work
Journey influence to the construction area, these key areas of oil vapour pollution area so that acquired sample is representative.
According to technical solution above, in the case of being more highly preferred to, to oil vapour pollution area include air shaft, sewage mouth these
Key area should encrypt the arrangement of collection point, the influence that emphasis assessment Oil Depot Construction generates environment.
Geohydrologic unit, that is, the water-bearing layer, relative water resisting layer, feeding area and discharge area and the underground water formed
The position of apparent displacement occurs along the plane of fracture for streaming system, the bad fault body, that is, rock stratum or rock mass, and the engineering construction influences
Area, that is, structure construction may influence the region of periphery geological conditions, because oil gas is revealed during the oil vapour pollution area, that is, oil storage
Surrounding enviroment may be generated with the region of pollution.
The water chemistry reaction type includes mainly that the dissolving of rock is reacted, redox reaction, hydrolysis.Silicate
Mineral include that hydrolysis mainly occurs for feldspar, pyroxene, hornblend, mica, olivine.The silicate and other mines of the iron containing low price
Object can be become high price iron by Oxidative demage.The dissolving of rock occurs always, and wherein calcite and dolomite easily dissolves
Reaction.
The water sample detection index is：K+、Cl-、Na+、Ca2+、Mg2+、HCO3 -、Al3+、SO4 2-、CO3 2-、NO3 -, salinity,
The indexs such as fully hard degree and pH value.The dissolving reaction of wherein rock should mainly detect K+、Cl-、Na+、SO4 2-、CO3 2-, hydrolysis answers
Predominantly detect Ca2+、Mg2+、K+、Na+、Al3+With the indexs such as pH value.Salinity, NO3 -, it is fully hard degree to detection water pollution degree have
Larger effect.
According to technical solution above, in the case of preferred, the water sample detection index that correlation is very high is converted to that
This mutual indepedent or incoherent new variables sets water sample sample number as n, the water sample detection index number of selection is p, then by water sample
Initial data can obtain matrix X=(xij)n×p, wherein xijIndicate the jth item achievement data of i-th of sample point, achievement data into
Row standardization, obtains normalized matrix, covariance matrix R, R is established according to standardized data matrixij(i, j=1,2 ..., p) is
Original variable XiWith XjRelated coefficient, calculation formula is：WhereinTable
Show the average value of i-th of sample point difference index,Indicate the average value of j indexs, xkjIndicate k-th sample point j index
Value, finds out characteristic value, principal component contributor rate and accumulative variance contribution ratio according to covariance matrix R, determines principal component number.
According to technical solution above, in the case of being more highly preferred to, characteristic equation is solved | λ E-R |=0, wherein E indicate unit square
Battle array, finds out eigenvalue λ i (i=1,2 ..., p), it is ranked sequentially by size, i.e. and 1 >=λ of λ 2 >=... i >=0 >=λ, principal component Zi
Contribution rateWherein λjIndicate the characteristic value of index, obtaining contribution rate of accumulative total isIt chooses and adds up tribute
The big conduct principal component of rate is offered, contribution rate of accumulative total reaches the eigenvalue λ 1 of 78%-95%, 1,2 corresponding to λ 2 ..., λ m ..., m (m
≤ p), wherein integer m is the number of principal component.
According to technical solution above, in the case of preferred, if being classified as in one group the water sample of sample point and water curtain for water hydratable
Study split-phase seemingly, illustrating water curtain system, there are hydraulic connections with the position, and the water seal effect of water curtain system is good, water curtain system energy
Effectively operation；It is on the contrary then illustrate that water curtain system is to be improved.
The underground water water sample of the locations Ruo Ku area sample point can be similar with water curtain water supply water sample Features of Hydrochemistry, illustrates that water curtain supplies water
It can be fully infiltrated at sample point, this is in the water supply coverage in water curtain hole, in this case the water seal of i.e. explainable water curtain system
It works well, effectively can prevent oil from revealing, the water seal effect of i.e. explainable water curtain system is good in this case.
The present invention also provides a kind of underground water-seal oil depot water curtain system validity to regulate and control method, based on above-mentioned water curtain system
Efficiency analysis is as a result, according to the main water chemistry reaction type of judgement, by the chemical composition tune for changing water curtain system water supply
Water-saving rock reaction process, regulates and controls water curtain system.
The beneficial effects of the invention are as follows：
The present invention is built using the Features of Hydrochemistry similitude of the areas underground water-seal oil depot Ku Zhi underground water as basis for estimation in difference
If period takes the rock sample water sample that can represent geological conditions, and is selected suitably according to rock mass mineral composition and hydrogeologic condition
Water chemistry data target；Sample point is grouped using the method that another kind of mathematical statistics method is combined, is obtained and water curtain system
The similar sample point distribution of system water supply Features of Hydrochemistry, to judge water curtain system validity；In conjunction with the main water rock in the areas Ku Zhi
Reaction type carries out water curtain system validity regulation and control by adjusting water curtain system water supply quality.This method can be comprehensively and accurately
Judge whether underground water-seal oil depot water curtain system can effectively run, and can according to analysis result to water curtain system validity into
Row regulation and control.
1, a kind of underground water-seal oil depot water curtain system efficiency analysis method based on ground water chemistry principle is established；
2, the present invention can judge the water chemistry that may occur according to the obtained areas oil depot Ku Zhi sampling of ground water Features of Hydrochemistry
Reaction type regulates and controls water curtain system for water constituent by adjusting water curtain.
Compared to judgment method before, the present invention can effectively avoid various disturbing factors, and obtained conclusion is also more
To be reliable, to judging that underground engineering safety has great significance under compound condition.Meanwhile the present invention has wide range of applications, and removes
Except underground water-seal oil depot, nuke rubbish is stored, carbon dioxide underground sequestration, rubbish underground landfill, natural gas storing etc.
Underground engineering is also suitable.
Description of the drawings
Fig. 1 is underground water-seal oil depot underground engineering structure figure；
Fig. 2 is the areas underground water-seal oil depot Ku Zhi underground water sample point position distribution situation；
Fig. 3 is dominant cation concentration situation of change in underground water in monitoring time section；
Fig. 4 is the situation of change of anion concentration in underground water in monitoring time section；
Fig. 5 is Cl in monitoring time section-Concentration situation of change；
Fig. 6 is NO in monitoring time section3 -Concentration situation of change；
Fig. 7 is pH value situation of change in monitoring time section；
Fig. 8 schemes for the Piper of in July, 2015 institute's water sampling；
Fig. 9 schemes for the Piper of in January, 2016 institute's water sampling；
Figure 10 schemes for the Piper of in July, 2016 institute's water sampling；
Figure 11 is the dendrogram of hierarchial-cluster analysis；
Figure 12 is the rubble figure of principal component analysis；
Figure 13 is taken the principal component scores scatter plot of sampling of ground water, principal component 1 by July, 2016 in different sample points
(PCA1) indicate that rock dissolution, principal component 2 (PCA2) indicate seepage flow.
Specific implementation mode
Following nonlimiting examples can make those skilled in the art be more fully understood the present invention, but not with
Any mode limits the present invention.
Embodiment
1 engineering background
1.1 project profile
Using the first Large Underground water seal oil depot engineering in China as background, area of storage cavern cavern is in 5 ° of north by west direction spread, east
Western width about 600m, north and south are about 838m, 300 × 104m of design storage capacity3, design life 50a.The underground water-seal oil depot work
Journey includes mainly underground engineering and ground auxiliary equipment two parts, wherein underground engineering is mainly by main cavern, construction tunnel and water
Curtain tunnel composition, engineering structure figure are as shown in Figure 1.9 caverns Ge Zhu are arranged in parallel by north and south is to the west, between the caverns every 3 Ge Zhu
It is connected to form 1 tank body by 4 branch holes, is divided into 3 hole tank groups.It is -50m, length 500 that cavern, which designs base surface absolute altitude,
~600m is differed, and the designed distance between the caverns Liang Ge is 30m.Designed distance between cavern's wall and adjacent construction tunnel wall is
25m.The engineering goes into operation in November, 2010, and in April, 2014 is completed, and puts into operation in June, 2015.
1.2 meteorological, landforms overviews
The climate type of the areas the Ku Zhi their location is North China warm-temperature zone monsoon type continental climate, with the humid air, weather temperature
With average temperature of the whole year is 12.2 DEG C.Between 711.2~798.6mm, June to September precipitation accounts for annual mean annual precipitation
70~76%, it focuses mostly in heavy rain several times.Average annual the amount of land evaporation is 1410mm, and monthly average peak appears in May, is
175mm。
The areas Ku Zhi belong to low mountains and hills landforms, and cave depot massif is closely east-west, ridge 280~350m of absolute altitude, ridge north side
For cliff, southern side is abrupt slope, and terrain slope is generally 35~55 °, and ridge south and north flanks develop nearly north-south and east northeast to coombe.
Cave depot main body is located at massif southern side, ground average elevation about 220m, and highest point absolute altitude is 350.9m, and lowest point absolute altitude is 97.5m,
Relative relief 253.4m.
1.3 geological conditions
Library location region shows that orogenic belt major developmental ductile shear belt and brittle fracture construction, fold building are not very sent out
It educates.According to geologic age, the difference of origin cause of formation lithology and engineering properties, the formation lithology in the areas Ku Zhi can be divided into 4 major class：4th system
Residual slide rock, diluvial formation, Early Creataceous Epoch monzonitic granite, late Proterozoic erathem granite gneiss, lamprophyre veins, diabase in the Early Creataceous Epoch
Arteries and veins.Wherein, master stratum is late Proterozoic erathem granite gneiss, accounts for 80% or more cave depot rock mass, is in shallow flesh pink~shallow cinerous,
Essential mineral is：Quartz, potassium feldspar, albite, anorthite, hornblend, biotite etc., particulate spend hilllock gneissic structure, blocky structure
It makes, rock mass is relatively broken~more complete, belongs to hard rock.
In order to find out the hydrogeologic condition in the areas Ku Zhi, to the areas Ku Zhi and the total about 50km of surrounding2Region is with having carried out the hydrology
Matter is investigated, and investigation result is shown, the areas Ku Zhi water-bearing media is late Proterozoic erathem granite gneiss, and main underground water present pattern is
Bedrock Crevice Water and loose rock class pore water, wherein rock crevice water can be divided into the reticulated cracks water of shallow-layer again and the veiny of deep layer is split
Gap water.The areas Ku Zhi are Hills And Low Mountains, and underground water is with Atmospheric precipitation for main Source Of Supply.Due to granite cranny development, ground
Shape is steeper, and ground line gradient is big, and Atmospheric precipitation is made to be drained mostly in the form of rainwash, infiltration capacity very little, and supply is poorer, according to the ground
Lower water seal cave depot engineering water resource demonstration reports that mean precipitation infiltration recharge is during this area 1980~2000 years
53.8mm, area mean annual precipitation 736.2mm for many years, the precipitation infiltration coefficient in the area is only 0.073.
The exploration of geotechnical engineering of the underground water-seal oil depot is investigated according to the design phase, cave depot builds up the areas Qian Kuzhi underground water
Hydrochemical type be SO4+HCO3- Ca+Na type water, and underground water colorless, tasteless, transparent, salinity is low, water quality is fine, can
Make to use water during domestic water and construction and operation.
2 research methods
2.1 water samplings and detection
To study underground water-seal oil depot Ku Zhi area's groundwater hydrochemical characteristics and Evolution, respectively in July, 2015,
In January, 2016, in July, 2016 to the areas oil depot Ku Zhi acquire sampling of ground water, acquire 37 parts of water sample altogether.It is strictly pressed when acquiring water sample
According to《DD2008-01》With《GB12999-91》In relevant regulations execute, the position distribution situation of sample point as shown in Fig. 2, point
Not Bao Kuo the engineering construction zone of influence include take permanent water level monitoring holes 5 (OF1~OF5)；Geohydrologic unit chooses interim bore
Hole ZK009；Bad fault body takes the interim drilling ZK013 of selection；Oil vapour pollution area includes air shaft 3 (VT1~VT3), dirt
The mouth of a river 3 (SF3, SF6, SF7) and water curtain supply water, the library in the water sample that these sample points are taken can reflect oil depot operational process
The variation of water of location area underground water.After water sampling, water sample is sent to Shandong Geological Environmental Monitoring Station in time
It is detected.Testing index is the concentration of common ion in underground water, including K+、Na+、Ca2+、Mg2+、Al3+、Cl-、SO4 2-、
HCO3 -、CO3 2-、NO3 -More than content and distribution is wide, the chemical classes of underground water can be determined substantially in underground water Deng, these ions
Type and feature.Wherein, cation (K+、Na+、Ca2+、Mg2+) concentration detected with flame courtyard absorption spectrophotometer,
NO3 -Concentration is detected with ultraviolet specrophotometer, HCO3 -、CO3 2-Concentration is all made of HCl titrations to detect.In addition detection refers to
Mark further includes salinity, fully hard degree and pH value etc., they are the important indicators that water quality is embodied in chemical composition of groundwater, to underground
The chemical property of water has important influence.
2.2 rock mineral compositions are analyzed
For the mineral composition of the areas research Ku Zhi rock, core sample is fetched in the sample point of underground water-seal oil depot, is then existed
A thin slice is respectively cut on the different core samples taken, takes 5 pieces of petrographic thin section, the mineralogical composition of taken petrographic thin section that can represent library altogether
The rock forming mineral in location area forms.Petrographic thin section after being then dried carries out XRD experiments, to obtain rock forming mineral group
At.
2.3 mathematical statistics
The hydraulic connection between the areas water seal effect He Kuzhi sample point to judge the water curtain system of the underground water-seal oil depot
Situation carries out clustering using the water sample that SPSS softwares pair are taken in July, 2016 and principal component analysis, formula is as described above.
The basic thought of clustering is to observe the close and distant relation between each sample according to the numerical characteristic of things, and between sample
Close and distant relation is then weighed by the distance between sample, and distance closely then indicates that the difference degree between sample is small, therefore is clustered
Being classified as one kind apart from close sample when analysis.This time the sample data of analysis is few, therefore uses hierarchial-cluster analysis.And it is main at
The basic thought of point analysis is to remove to explain most of variable in original data with less variable, and correlation in data is very high
Original variable, which is converted to, to be mutually independent or incoherent new variables, these independent of one another or incoherent new variables are exactly to lead
Ingredient.When the high original variable of correlation is converted into incoherent new variables, the population variance of variable remains unchanged, and converts
The first obtained variable has maximum variance, referred to as first principal component；Bivariate variance time is big, and with the first variable
It is uncorrelated, referred to as Second principal component,；And so on, 1 variable just has 1 principal component.
3 Chemical characteristic analysis
3.1 groundwater hydrochemical characteristics
The results are shown in Table 1 for the water quality detection of different monitoring time section institutes water sampling, as shown in Table 1, the master in underground water
It includes Na to want ion+、Ca2+、Mg2+、Al3+、Cl-、SO4 2-And HCO3 -, in cation, Na+、Ca2+Content is more, wherein Na+It is
Most important cation；In anion, Cl-And HCO3 -Content is more, wherein HCO3 -It is most important anion.Oil depot is being transported
During row, change to a certain extent can occur for the Features of Hydrochemistry of underground water, and prison is drawn out respectively according to result described in table 1
The situation of change for surveying main zwitterion concentration in underground water in the period is as shown in Figure 3 and Figure 4, as seen from the figure, in monitoring
Between in section, the K in underground water+、Na+、Ca2+、Mg2+、HCO3 -Ion concentration is totally in rising trend, SO4 2-Ion concentration is in totally
Downward trend.
The water quality detection result of institute's water sampling in 1 detection time section of table
As shown in figure 5, oil depot Cl in underground water during operation-Concentration be less than 100mg/L (in January, 2016
Except water curtain supplies water), according to《Code for investigation of geotechnical engineering》Water is to Reinforcement Bar Corrosion in Reinforced Concrete in GB50021-2001
Evaluation index belongs to weak corrosion, therefore anchor pole, steel lagging jack, bar-mat reinforcement etc. that underground water uses cave depot supporting corrode without apparent
Effect.
Oil depot NO in underground water during operation3 -Concentration it is as shown in Figure 6.It will be appreciated from fig. 6 that the NO in monitoring time section3 -
Ion concentration totally in first increasing the trend dropped afterwards, i.e. in January, 2016 institute's water sampling NO3 -Ion concentration is higher, in other monitorings
Period is relatively low.Since the hydrological geological conditions in the areas Ku Zhi are by anthropogenic influence's very little, and Atmospheric precipitation is this area's underground water
Main source, therefore the NO in this area's underground water3 -Ion concentration is mainly related with precipitation.This area annual June~September is rich
The water phase, precipitation foot, rainwater, which permeates the ground, can lead to NO3 -Ion concentration reduces.In addition, annual winter is the low water of this area
Phase, this area's precipitation deficit of the second half year in 2015, therefore NO3 -Ion concentration is in higher level.According to《Drinking Water health
Standard GB5749-2006》, the NO in drinking water3 -Ion concentration need to be less than 10mg/L.Therefore what in July, 2015 took in OF2, SF6
The NO of water sample3 -Ion concentration is above standard；In January, 2016 water curtain supply water and OF2, VT1~3 in the NO of water sample that takes3 -Ion is dense
Degree is above standard.
The underground water-seal oil depot operation after initial operating stage, the salinity of the areas Ku Zhi underground water is not high, salinity it is big
Small to be concentrated mainly between 200mg/L~400mg/L, in the operational process of oil depot, the salinity of underground water is in mainly to rise
Trend, but it is less than 1000mg/L, still fall within fresh water.The underground water in the areas Ku Zhi is in alkalescent more simultaneously, as shown in fig. 7, prison
The pH value majority of institute's water sampling in the period is surveyed between 7~8.5, with the operation of oil depot, the pH value in underground water is overall
It is on a declining curve.In addition the pH value for water sample being obtained in January, 2016 VT3, ZK009 and in July, 2016 VT1 is not inconsistent standardization.
3.2 ground water chemistry type evolution features
In order to intuitively express the Features of Hydrochemistry of outbound location area underground water and the relative amount of leading ion, utilize
AquaChem draws out the Piper trilinear charts of the areas water seal oil cave depot Ku Zhi underground water in the different time respectively.2015 7
The Piper figures for the sampling of ground water that the moon is taken as shown in figure 8, in 9 parts of water samples that in July, 2015 is taken, sun in underground water from
Son is mainly with Na+、Ca2+Based on, the anion in underground water is then mainly with HCO3 -Based on, main groundwater chemical type is
HCO3- Ca+Na type water.The Piper of the sampling of ground water that in January, 2016 is taken schemes as shown in figure 9, the cation in underground water at this time
Mainly with Na+、Ca2+Based on, anion is then mainly with HCO3 -And Cl-Based on.K in underground water+、Na+Relative abundance compared with 2015
July increases, and illustrates that the leaching occurred in the areas Ku Zhi ground water regime can make K+、Na+Concentration increase.This stage
Main groundwater chemical type is HCO3- Ca+Na types water and SO4+ Cl-Na type water.
The Piper figures for the sampling of ground water that in July, 2016 is taken are as shown in Figure 10, and the cation in underground water is with Na+、Ca2+
Based on, anion is then with HCO3 -And Cl-Based on.In January, 2016 between in July, 2016, the SO in underground water4 2-It is relatively rich
Degree is declined, and illustrates that the leaching occurred in the areas Ku Zhi ground water regime can consume SO4 2-, the steaming in underground water in addition
Hair inspissation can then lead to Cl-Relative abundance increase.This stage main ground water chemistry type is HCO3- Ca types water and
SO4+ Cl-Na type water.
The Piper figures of comprehensive each stage quality of groundwater testing result and institute's water sampling, it is known that, in the underground water oil sealing
Library initial operating stage, the hydrochemical type of underground water is with HCO3- Na+Ca types water and SO4Based on+Cl-Na type water, wherein most important
It is HCO3- Na+Ca type water.The formation of chemical composition of groundwater acts on mainly based on leaching and evaporation concentration effect,
In, leaching can lead to K+、Na+、Ca2+And HCO3 -Relative abundance increase, SO4 2-Relative abundance then be in decline
Trend；Evaporation concentration effect can then cause the relative abundance of Cl- to increase.
3.3 water rock chemical reaction features
XRD experiments are carried out to the rock sample thin slice of acquirement, each rock sample thin slice is calculated according to XRD experimental results
Chemical element composition it is as shown in table 2.As shown in Table 2, the equiatomic quantity percentage of Si, O, Al, K, Na and C in the areas Ku Zhi rock
It is more bigger than, meet the feature of typical granite, in conjunction with the design phase to the exploration of geotechnical engineering tune of the underground water-seal oil depot
Look into, it is known that the rock forming mineral of this area is mainly potassium feldspar, albite and anorthite, when in rock forming mineral potassium feldspar and sodium it is long
Stone and anorthite can be partly dissolved when being contacted with underground water, and reaction equation is as follows：
2KAlSi3O8+2H2CO3+9H2O→Al2Si2O5(OH)4+2K++2HCO3 -+4H2SiO4 2-(potassium feldspar)
2NaAlSi3O8+2H2CO3+9H2O→Al2Si2O5(OH)4+2Na++2HCO3 -+4H2SiO4 2-(albite)
2Ca0.5AlSi3O8+2H2CO3+9H2O→Al2Si2O5(OH)4+Ca++2HCO3 -+4H2SiO4 2-(anorthite)
By the above reaction equation it is found that underground water is in potassium feldspar, the albite and when anorthite in dissolving surrounding rock,
K can be generated+、Na+、Ca2+、HCO3 -So that these ion concentrations increase, and the pH value in underground water can be made to reduce, meeting simultaneously
Along with kaolinic generation.In addition, as the Ca in underground water2+When higher concentration, part Ca2+Meeting and SO4 2-Reaction generates
It is slightly soluble in the CaSO of water4, so that the SO in underground water4 2-Concentration is on a declining curve, and reaction equation is as follows：Ca++SO4 2-
→CaSO4↓
The chemical element of 2 each rock sample thin slice of table forms
4 water curtain system efficiency analysis
Underground water-seal oil depot can the water seal effect of normal operation and its water curtain system exist and directly contact.When water curtain system
When system can effectively be run, the water inside water curtain tunnel can be fully infiltrated into underground, since the density ratio oil density of water is big, and stone
Oil does not dissolve in water, therefore when water curtain system can effectively be run, the water curtain of the areas Ku Zhi Groundwater formation can prevent Oil spills, ensure
The normal operation of oil depot.To judge whether water curtain system can effectively run, the present invention utilizes statistical method, under base area
Water water quality detection judges the validity of water curtain system with this as a result, for statistical analysis.To judge the underground water-seal oil depot water
The real-time water seal effect of curtain system, takes in July, 2016 institute's water sampling data to carry out clustering and principal component analysis.
4.1 clustering
Hierarchial-cluster analysis is carried out to the water quality detection result of in July, 2016 institute's water sampling, obtains hierarchial-cluster analysis
Dendrogram is as shown in figure 11.Dendrogram obtained by Hierarchical Clustering, the underground moisture that in July, 2016 can be taken are 5 groups,
Group result is as shown in table 3.Wherein, water curtain water supply, OF1, OF2, OF3, OF4, OF5, ZK013 are one group, and SF3, SF6, SF7 are
One group, independent one group of VT1, VT2, VT3 is one group, independent one group of ZK009.Underground water water sample Hydrochemical Composition class in same group
Seemingly, therefore it may determine that there are hydraulic connections between sample point.
3 hierarchial-cluster analysis group result of table
4.2 principal component analysis
Principal component analysis is carried out to the water quality detection result of in July, 2016 institute's water sampling, it is as shown in figure 12 to obtain rubble figure.
There are 2 principal component factors after principal component analysis according to component-part diagram and rotation component matrix, their accumulative variance contributions
Rate has reached 79.4%, can represent out most information of original variable.Component score coefficient matrix is as shown in table 4.
The component score coefficient matrix of 4 principal component analysis of table
According to the result of principal component analysis, it can be deduced that the factor score of each water sample, the then factor score of each water sample multiply
Square root to correspond to the characteristic value of principal component is the principal component scores of the water sample.Each sampling of ground water is drawn according to result of calculation
The scatter plot of principal component scores is as shown in figure 13.In the scatter plot of sampling of ground water principal component scores, if the point of statement water sample
Positional distance it is closer, then illustrate that water chemistry property between them is close, i.e., there are hydraulic connections between water sample.Therefore by Figure 13
It is found that the underground moisture that we can take in July, 2016 is 4 groups.Wherein, water curtain feed water inlet, OF1, OF2, OF3, OF4,
It is one group that water sample is obtained in OF5, ZK013, and it is one group that water sample is obtained in SF3, SF6, SF7, and water sample is obtained in VT1, VT2, VT3 and is
One group, ZK009 is interior to obtain independent one group of water sample.The Features of Hydrochemistry of underground water in same group has higher similitude, i.e.,
There are hydraulic connections.
4.3 water curtain validity discussion
Comprehensive clustering and principal component analysis as a result, by water curtain water supply, OF1, OF2, OF3, OF4, OF5, ZK013
Underground water be summarized as one group, the water sample taken in SF3, SF6, SF7 is summarized as one group, and the underground water taken in VT1, VT2, VT3 is returned
It is one group to receive, and the underground water obtained at ZK009 is individually for one group, and group result is as shown in table 5.
According to group result shown in table 5, it is known that be distributed in the permanent water level monitoring holes OF1 of the underground water-seal oil depot surrounding~
Underground water in OF5 and the interim holes drilling ZK013 is similar to the Features of Hydrochemistry that water curtain supplies water, i.e., they have water to each other
Power contacts.This illustrates that the moisture in water curtain system can be fully infiltrated into underground and forms water curtain, can effectively prevent the leakage of oil, water
Envelope works well, and water curtain system can effectively be run.In addition, the 2nd group is water sample in vertical shaft, Hydrochemical Composition is similar to each other；
3rd group is Wastewater Sample, and since three hole tank storage oil properties are consistent, three water sample Hydrochemical Compositions are similar；4th group
For library location far field underground water water sample, not by cave depot Influence to operation.
The type of the statistical analysis classification results and sample point of the underground water of 5 each sample point of table
In conclusion using domestic first Large Underground water seal oil depot as background, according to the sample time and sampling determined
Point acquires rock sample and underground water water sample respectively, carries out XRD analysis to the rock sample of acquisition, obtains the mine of the areas Ku Zhi rock
Object group becomes quartzy (9.5%), albite (18.1%), anorthite (59.3%), potassium feldspar (8.1%), biotite (5%).
According to the mineral composition of rock, the exploration of geotechnical engineering of the underground water-seal oil depot is investigated in conjunction with the design phase, judges outbound location
The main water chemistry reaction occurred in area's ground water regime is the hydrolysis of feldspar (potassium feldspar, albite and anorthite),
And then the water chemistry data target used when judging for statistical analysis, including K+、Na+、Ca2+、Mg2+、Al3+、Cl-、SO4 2-、
HCO3 -、CO3 2-、NO3 -Deng) concentration, salinity, fully hard degree and pH value etc..Water sample is detected, the water quality detection point of institute's water sampling is obtained
The results are shown in Table 1 for analysis；Principal component is chosen to related chemical measurements of water, principal component 1 indicates that the dissolving of rock, principal component 2 indicate
The seepage flow of underground water.In conjunction with clustering by Hydrochemical Composition it is similar be classified as one group it is as shown in figure 12.According to cluster analysis result,
Water sample distribution situation enumerate as shown in table 5, as shown in Table 5, is distributed in the permanent water level of the underground water-seal oil depot surrounding
Underground water in monitoring holes OF1~OF5 and the interim holes drilling ZK013 is similar to the Features of Hydrochemistry that water curtain supplies water, i.e., they
There is hydraulic connection to each other.This illustrates that the moisture in water curtain system can be fully infiltrated into underground and forms water curtain, can effectively prevent
The leakage of oil, water seal effect is good, and water curtain system can effectively be run.
Claims (9)
1. a kind of underground water-seal oil depot water curtain system efficiency analysis method, which is characterized in that specifically include following steps：
(1) sample collection：Rock sample and underground water water sample are acquired respectively according to the sample time and sample point that determine；
(2) sample detection：XRD analysis is carried out to the rock sample of acquisition, to obtain the mineral composition of the areas Ku Zhi rock, according to rock
The water chemistry reaction that the mineral composition ingredient and region hydrogeology condition judgment of stone occur, to choose adaptable water sample detection
Index；
(3) data analysis：It is combined using two kinds of mathematical statistics methods of clustering and principal component analysis, correlation is very high
Water sample detection index, which is converted to, to be mutually independent or incoherent new variables, is obtained water sample principal component, is drawn each sampling of ground water
The scatter plot of principal component, and major influence factors are obtained, it is dissolving and the seepage flow of underground water of rock respectively, to principal component scatterplot
Sample point on figure is grouped, and the closer point in position on principal component scatter plot is classified as one group；
(4) water curtain validity discussion：Water curtain water supply Features of Hydrochemistry is analyzed, it is similar to water curtain water supply Features of Hydrochemistry by analyzing
Sample point distribution situation judge water curtain system validity.
2. underground water-seal oil depot water curtain system efficiency analysis method according to claim 1, which is characterized in that the rock
Before Oil Depot Construction, the water sampling should be carried out before Oil Depot Construction, in building and after putting into operation stone sample collection respectively,
It can reflect and descend Hydrochemical variation feature in the entire process.
3. underground water-seal oil depot water curtain system efficiency analysis method according to claim 1, which is characterized in that described to take
The sample time should avoid sampling in storm period and unusual weather conditions period dry spell, and the water sampling process should be complete in 1~3 day
At.
4. underground water-seal oil depot water curtain system efficiency analysis method according to claim 1, which is characterized in that described to take
Sampling point is geohydrologic unit, bad fault body, the engineering construction zone of influence, these key areas of oil vapour pollution area.
5. underground water-seal oil depot water curtain system efficiency analysis method according to claim 4, which is characterized in that oil gas
The air shaft of contaminated area, sewage mouth these key areas should encrypt the arrangement of collection point.
6. underground water-seal oil depot water curtain system efficiency analysis method according to claim 1, which is characterized in that described to incite somebody to action
The very high water sample detection index of correlation, which is converted to, to be mutually independent or incoherent new variables, i.e., described that correlation is very high
Water sample detection index be converted to and be mutually independent or incoherent new variables, that is, set water sample sample number as n, the water sample of selection
Testing index number is p, then can obtain matrix X=(x by the initial data of water sampleij)n.p, wherein xijIndicate the jth of i-th of sample point
Item achievement data, i, j=1,2 ..., p establish covariance matrix R, RijFor original variable XiWith XjRelated coefficient, calculate
Formula is：WhereinIndicate the average value of i-th of sample point difference index,Indicate the average value of j indexs, xkjIt indicates that k-th of sample point j refers to target value, characteristic value, master is found out according to covariance matrix R
Components contribution rate and accumulative variance contribution ratio, determine principal component number.
7. underground water-seal oil depot water curtain system efficiency analysis method according to claim 6, which is characterized in that solution feature
Equation | λ E-R |=0, wherein E indicate unit matrix, find out eigenvalue λ i, wherein i=1,2 ..., p, sequence is arranged by size by it
Row, i.e. 1 >=λ of λ 2 >=... i >=0 >=λ, the contribution rate of principal component ZiWherein λjThe characteristic value for indicating index, obtains
Contribution rate of accumulative total isThe big conduct principal component of contribution rate of accumulative total is chosen, contribution rate of accumulative total reaches the feature of 78%-95%
1,2 corresponding to value λ 1, λ 2 ..., λ m ..., m, wherein m≤p, integer m are the number of principal component.
8. underground water-seal oil depot water curtain system efficiency analysis method according to claim 1, which is characterized in that if being classified as
The water sample of sample point is similar with water curtain water supply Hydrochemical Composition in one group, illustrates water curtain system and the position there are hydraulic connection,
The water seal effect of water curtain system is good, and water curtain system can effectively be run；It is on the contrary then illustrate that water curtain system is to be improved.
9. a kind of underground water-seal oil depot water curtain system Effective Regulation method, which is characterized in that based on described in the claims 1-8
Method carry out water curtain system efficiency analysis as a result, according to the water chemistry reaction type of judgement, pass through and change water curtain system
The chemical composition of water supply adjusts Water-rock interaction process, and then regulates and controls to water curtain system.
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