CN105911259A - Method for judging evolution process of rock fluid forming after carbon dioxide injected into sandstone - Google Patents

Method for judging evolution process of rock fluid forming after carbon dioxide injected into sandstone Download PDF

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CN105911259A
CN105911259A CN201610531401.9A CN201610531401A CN105911259A CN 105911259 A CN105911259 A CN 105911259A CN 201610531401 A CN201610531401 A CN 201610531401A CN 105911259 A CN105911259 A CN 105911259A
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dawsonite
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李福来
李文帅
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China University of Petroleum East China
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Abstract

The invention relates to the field of sandstone fluid evolution and especially relates to a method for judging an evolution process of rock fluid forming after carbon dioxide injected into sandstone. According to the method, dawsonite-bearing sandstone is taken as a natural analogue sample, and ancient and modern fluid characteristics and an authigenic mineral compound are combined for confirming the evolution process of rock fluid forming before and after carbon dioxide is injected into sandstone. The method of quantitatively judging the evolution process of rock fluid forming after carbon dioxide is injected into sandstone can supply a new thought for researching CO2 geological seal and storage. CO2 tracing mineral-dawsonite is taken as a core, so that a simple, clean and clear acquaintance is supplied to the evolution process after CO2 is injected into the storage layer.

Description

The method judging carbon dioxide injection sandstone deuterogene rock fluid Evolution process
Technical field
The present invention relates to sandstone fluid Evolution field, judge CO particularly to one2The method injecting the Diagenesis fluids evolutionary process after sandstone.
Background technology
CO2Trapping and geological storage (CCS) be to reduce greenhouse gas emission, main path that mitigation of global climate warms (Holloway, 2004；Enting et al.,2008,Benson and Cole,2008；Oelkers and Cole, 2008), the CO i.e. by manual type, industry produced2Inject in subsurface wastewater infiltration system reservoir, captured by structure and stratigraphic trap, hydrodynamic force captures, dissolve the modes such as capture, mineral capture seals up for safekeeping for a long time (Xu et al., 2006；Bachu et al.,2007；Gaus,2010；Depaola and Cole, 2013), thus reduce the carbon emission amount to air.By CO2Inject in underground deep permeability reservoir, " fix " with the form of stable carbonate mineral that to get off be considered as long-term CO2Seal up for safekeeping most stable of approach (Bachu et al., 2004；IPCC,2005).Numerical simulation and water-rock experiment show: dawsonite is CO2The trap CO formed after being injected into sandstone2One of essential mineral (Xu et al., 2004,2005；Zerai et al.,2006).Field observation shows: the appearance of dawsonite and Regional Magmatic be movable and abstriction is closely connected (Golab et al., 2006；Moore et al.,2009).Dawsonite is formed at high pCO with it2, alkaline fluids environment, and often and CO2The feature of gas reservoir phase association, is considered CO2Fluid migration, " tracing mineral " (the Gao et al., 2005) of gathering, be also stable " carbon sequestration mineral " (Worden, 2006).By Stable Carbon hydrochlorate mineral sequestration CO such as dawsonites2Be considered as effective approach (Klusman, 2003；Kharaka et al.,2006).
In the CCS engineering carried out now, CO2The more difficult expectation of change after sealing up for safekeeping, reservoir Minerals and fluid state produced.For CO2Reservoir is all the key that can CCS technology be used safely with the interaction of mineral and the impact that causes properties of fluid in bearing stratum.For sandstones with dawsonite petrology and the systematic study of Diagenesis fluids feature, be conducive to reasonably recognizing CO2Formation fluid property change after filling, is also beneficial to the diagenesis information deeper into ground research sandstones with dawsonite and CO2The problems such as geological storage feasibility.But existing technology is for CO2In reservoir, it is mainly qualitative understanding with the interaction of mineral and impact that properties of fluid in bearing stratum is caused, lacks the means of quantification, it is difficult to rational judgment CO2Inject the Diagenesis fluids evolutionary process after sandstone.
Summary of the invention
The present invention is directed to deficiency of the prior art, it is provided that one judges CO2Inject the new method of sandstone deuterogene rock fluid Evolution process, for CO2Geological storage research provides a kind of new thinking, with CO2Tracing mineral-dawsonite is core, it is possible to for CO2After injecting reservoir, evolutionary process provides the understanding of more simple and clear.
The judgement CO of the present invention2Comprising the concrete steps that of the method for injection sandstone deuterogene rock fluid Evolution process:
Take the sandstones with dawsonite on detection ground as natural analog；
According to Arthroscopic characteristic, it is judged that CO2Inject the diagenesis paragenetic sequence after sandstone；
Diagenetic stage is judged according to Clay Minerals In Sandstones composition, the highest pyrolysis temperature of organic matter, reflectance of vitrinite；
According to formation water feature now, it is judged that sandstone characteristic of fluid now；
Oxygen and carbon isotopes composition according to dawsonite calculates fossil fluid salinity, determines the fossil fluid feature forming dawsonite；
According to CO2Filling sequential, according to the different types of mineral formation time, determine diagenesis paragenetic sequence, it is judged that diagenetic stage, thus divide authigenic mineral combination, summary sandstone characteristic of fluid now and fossil fluid feature and authigenic mineral combination prepare CO2Inject the Diagenesis fluids evolutionary pattern figure after sandstone, the CO2 injection sandstone deuterogene rock fluid Evolution process on this detection ground of deriving according to ideograph.
Further, described Arthroscopic characteristic acquisition methods is to use Alizarin red staining leaf optical microscope lens-belowed identifying and the method for SEM scanning electron microscope metal spraying thin section identification.
Further, the determination method of described diagenesis paragenetic sequence specifically includes that the mineral being initially formed are attached to the surface of detrital grain；The mineral-filled that evening is formed is in residual pore space；Explanation authigenic mineral person in early days, formation should be later than authigenic mineral in early days；Adhesion or embedding brilliant mineral formation are later；Late period, authigenic mineral growth was limited by authigenic mineral in early days.
Further, the method for described acquisition formation water feature now is: sampling obtains formation water sample now, laboratory measurement, measures pH and the ion composition of formation water now, by Su Lin formation water water type splitting scheme.
Further, Su Lin formation water water type splitting scheme is for passing through Na+/Cl-、(Na+-Cl-)/SO4 2-、(Cl--Na+)/Mg2+、SO4 2-/Cl-The method judging water type:
(Na+-Cl-)/SO4 2-> 1 it is sodium bicarbonate type (NaHCO3)；(Cl--Na+)/Mg2+> 1 it is calcium chloride (CaCl2)；(Na+-Cl-)/SO4 2-< 1 is sodium sulfate type (Na2SO4)；(Cl--Na+)/Mg2+< 1 is chloride-magnesium type (MgCl2)。
Further, the method that the described oxygen and carbon isotopes composition according to dawsonite calculates fossil fluid salinity is:
Measure the oxygen and carbon isotopes composition of dawsonite in sandstone, determine the δ of dawsonite13CPDBThe distribution of value, δ18OPDBThe distribution of value, according to δ18OSMOWWith δ18OPDBReduction formula, is shown in formula: δ18OSMOW=1.03091 δ18OPDB+ 30.91, calculate δ18OSMOWThe distribution of value.
Use the empirical equation that Keith and Weber (1964) proposes, the paleosalinity Z value of the formation fluid of calculating formation dawsonite: Z=a (δ13CPDB+50)+b(δ18OPDB+ 50), a=2.048, b=0.498 in above formula；When Z value>120 time be sea water or Hunan, lake salt water medium, Z value<being fresh water medium when 120, if Z Distribution value scope is existing>120 also have<120, illustrate formed dawsonite formation fluid there is mixed sources.
The invention has the beneficial effects as follows: the present invention be directed to sandstones with dawsonite petrology and the systematic study of Diagenesis fluids feature, it is possible to quantitative judgement CO2Inject the Diagenesis fluids evolutionary process after sandstone, for CO2Geological storage research provides a kind of new thinking, with CO2Tracing mineral-dawsonite is core, is conducive to reasonably recognizing CO2Formation fluid property change after filling, the method for the present invention is also beneficial to the diagenesis information deeper into ground research sandstones with dawsonite and CO2The problems such as geological storage feasibility.
Accompanying drawing explanation
Fig. 1 is CO2Inject the diagenesis paragenetic sequence figure after sandstone；
Fig. 2 is formation water characteristic pattern now；
Fig. 3 is Diagenesis fluids evolutionary process figure；
Detailed description of the invention
Technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described embodiment is only section Example of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
On the one hand the embodiment of the present invention provides one and judges CO2Comprising the concrete steps that of injection sandstone deuterogene rock fluid Evolution process approach:
Take the sandstones with dawsonite on detection ground as natural analog；
According to Arthroscopic characteristic, it is judged that CO2Inject the diagenesis paragenetic sequence after sandstone；
Diagenetic stage is judged according to Clay Minerals In Sandstones composition, the highest pyrolysis temperature of organic matter, reflectance of vitrinite；
According to formation water feature now, it is judged that sandstone characteristic of fluid now；
Oxygen and carbon isotopes composition according to dawsonite calculates fossil fluid salinity, determines the fossil fluid feature forming dawsonite；
According to CO2Filling sequential, according to the different types of mineral formation time, determine diagenesis paragenetic sequence, it is judged that diagenetic stage, thus divide authigenic mineral combination, summary sandstone characteristic of fluid now and fossil fluid feature and authigenic mineral combination prepare CO2Inject the Diagenesis fluids evolutionary pattern figure before and after sandstone, the CO on this detection ground of deriving according to ideograph2Inject Diagenesis fluids evolutionary process before and after sandstone.
In one embodiment of this invention, above-mentioned four steps after dawsonite are taken, i.e. according to Arthroscopic characteristic, it is judged that CO2Inject the diagenesis paragenetic sequence after sandstone；Diagenetic stage is judged according to Clay Minerals In Sandstones composition, the highest pyrolysis temperature of organic matter, reflectance of vitrinite；According to formation water feature now, it is judged that sandstone characteristic of fluid now；Oxygen and carbon isotopes composition according to dawsonite calculates fossil fluid salinity, determines the fossil fluid feature forming dawsonite, all can adjust sequencing as required in normal ranges.
In one embodiment of this invention, Arthroscopic characteristic acquisition methods is to use Alizarin red staining leaf optical microscope lens-belowed identifying and the method for SEM scanning electron microscope metal spraying thin section identification, and it is accurate that both approaches enables to obtain feature.
In one embodiment of this invention, the determination method of diagenesis paragenetic sequence specifically includes that the mineral being initially formed are attached to the surface of detrital grain；The mineral-filled that evening is formed is in residual pore space；Explanation authigenic mineral person in early days, formation should be later than authigenic mineral in early days；Adhesion or embedding brilliant mineral formation are later；Late period, authigenic mineral growth was limited by authigenic mineral in early days.Above-mentioned determine method may determine that detection sample As time goes on diagenesis paragenetic sequence change.
In one embodiment of this invention, the method obtaining formation water feature now is: sampling obtains formation water sample now, laboratory measurement, measures pH and the ion composition of formation water now, by Su Lin formation water water type splitting scheme.
Concrete, Su Lin formation water water type splitting scheme is for passing through Na+/Cl-、(Na+-Cl-)/SO4 2-、(Cl--Na+)/Mg2+、SO4 2-/Cl-The method judging water type:
(Na+-Cl-)/SO4 2-> 1 it is sodium bicarbonate type (NaHCO3)；(Cl--Na+)/Mg2+> 1 it is calcium chloride (CaCl2)；(Na+-Cl-)/SO4 2-< 1 is sodium sulfate type (Na2SO4)；(Cl--Na+)/Mg2+< 1 is chloride-magnesium type (MgCl2)。
In one embodiment of this invention, according to the method for the oxygen and carbon isotopes composition calculating fossil fluid salinity of dawsonite it is:
Measure the oxygen and carbon isotopes composition of dawsonite in sandstone, determine the δ of dawsonite13CPDBThe distribution of value, δ18OPDBThe distribution of value, according to δ18OSMOWWith δ18OPDBReduction formula, is shown in formula: δ18OSMOW=1.03091 δ18OPDB+ 30.91, calculate δ18OSMOWThe distribution of value.
Use the empirical equation that Keith and Weber (1964) proposes, the paleosalinity Z value of the formation fluid of calculating formation dawsonite: Z=a (δ13CPDB+50)+b(δ18OPDB+ 50), a=2.048, b=0.498 in above formula；When Z value>120 time be sea water or Hunan, lake salt water medium, Z value<being fresh water medium when 120, if Z Distribution value scope is existing>120 also have<120, illustrate formed dawsonite formation fluid there is mixed sources.
In order to become apparent from introducing the judgement CO that the embodiment of the present invention is provided in detail2The method injecting sandstone deuterogene rock fluid Evolution process, illustrates below with reference to specific embodiment.
With Dongying hollowly district as example, it is judged that CO2The method injecting sandstone deuterogene rock fluid Evolution process comprises the concrete steps that:
A takes detection ground sandstones with dawsonite and studies as natural analog, sampling；
B is according to Arthroscopic characteristic, it is judged that CO2Inject the diagenesis paragenetic sequence after sandstone；See Fig. 1, Fig. 1 and indicate CO2After injecting sandstone, with the passage of Geologic Time, the formation order of sandstone, i.e. diagenesis paragenetic sequence collection of illustrative plates.
C judges diagenetic stage according to Clay Minerals In Sandstones composition, the highest pyrolysis temperature of organic matter, reflectance of vitrinite；
By judging, the diagenetic stage of the sandstones with dawsonite middle diagenesis A phase, part is up to the middle diagenesis B phase, its material evidence is as follows: 1. smectite mixes layer than average out to 20%, smectite (S) layer proportion feature in Iraq/Mongolia mixes layer (I/S) reflects that organic matter is in half ripe-maturation period, and therefore the diagenetic stage belongs to the middle diagenesis A-B phase；The reflectance of vitrinite (Ro) of middle diagenetic stage is 0.5-1.3%, and reflectance of vitrinite is 0.51-0.77%, and therefore the diagenetic stage belongs to the middle diagenesis A phase；The highest pyrolysis temperature is 430～450 DEG C, average out to 443 DEG C, and pyrolysis temperature peak temperature is mostly focused between 440-450 DEG C, and a small amount of pyrolysis temperature is less than 435 DEG C, for the middle diagenesis B phase.
D is according to formation water feature now, it is judged that sandstone characteristic of fluid now；
Determine that formation water feature is as shown in Figure 2 now, according to formation water water sample analysis data (Fig. 2) in Dongying Depression SHAHEJIE FORMATION sandstones with dawsonite (a in Fig. 2) and common sandstone and Song-liao basin Changling Sag (c in Fig. 2) and the Comparison of Geochemical Features of Wuerxun Sag in Hailaer Basin sandstones with dawsonite water sample analysis data (d in Fig. 2), compared with formation water in common sandstone, sandstones with dawsonite formation water has the HCO of obvious high-load3 -, it is mainly derived from CO2Fluid-filled.And Dongying Depression sandstones with dawsonite interval and square Wang Fu CO2Gas reservoir has preferable correspondence in spatial distribution, thus it is speculated that in the sandstone of study area, formation water character is controlled by CO2Distribution.The salinity of formation water can reflect the quality of stratum sealing condition simultaneously, the interval that sealing condition is good, and the salinity of formation water is of a relatively high.Formation water feature is closure alkalescence NaHCO the most now3Formation water.
E forms calculating fossil fluid salinity according to the oxygen and carbon isotopes of dawsonite, determines the fossil fluid feature forming dawsonite；
Determine formed dawsonite fossil fluid feature: the δ of study area dawsonite13CPDBThe distribution of value is-2.27～+3.50 ‰；δ18OPDBThe distribution of value is-13.34～-10.82 (tables 1).According to δ18OSMOWWith δ18OPDBReduction formula, is shown in formula: δ18OSMOW=1.03091 δ18OPDB+ 30.91, calculate δ18OSMOWThe distribution of value is+17.16～+19.76 ‰.
Table 1 dawsonite isotopics
*According to O ' Neil (1969) CaCO3-H2The δ of the formation fluid of the dawsonite balance that O HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN Equation for Calculating goes out18O value
Due to CaCO3-H2O Equilibrium fractionation factor and dawsonite-H2O Equilibrium fractionation factor approximately equal, therefore, according to CaCO3-H2O system Fractionation Equations, calculates and the formation fluid δ of dawsonite balance18OH2OValue is-2.07～+0.35 ‰ (table 1).
δ18OCaCO3-δ18OH2O=2.78 × 106/T2–2.89
In above formula: δ18OCaCO3δ for dawsonite18OSMOWValue；δ18OH2OThe oxygen isotope value of the formation fluid for balancing with dawsonite.According to CaCO3-H2The δ of the formation fluid with dawsonite balance that O Fractionation Equations calculates18OH2OValue is-2.07～+0.35 ‰ (table 1).Normally descend the δ of hydrothermal solution18OH2OValue scope is+6～+10 ‰, the δ of Atmospheric precipitation18OH2OValue is generally less than-2 ‰, seals the δ of type subsurface brine up for safekeeping18OH2OValue scope is-2～+6 ‰.δ with the formation fluid of dawsonite balance18OH2OValue is in the δ of subsurface brine18OH2OIn the range of value, research thinks that the fluid forming dawsonite predominantly seals type subsurface brine up for safekeeping.
In order to analyze fluid properties further, use Keith and Weber (1964) empirical equation that proposes, calculate the paleosalinity Z value of the formation fluid forming dawsonite, see formula: Z=a (δ13CPDB+50)+b(δ18OPDB+50)
A=2.048 in above formula, b=0.498；When Z value>120 time be sea water or Hunan, lake salt water medium, Z value<is fresh water medium when 120.Z Distribution value scope is 116.64～128.92, thus it is speculated that the formation fluid forming dawsonite is likely to be of mixed sources.
Calmodulin binding domain CaM geologic information, four sections of (ES of SHAHEJIE FORMATION4) deposition period weather is more arid, Bohai gulf basin is the salt lake-brackish water lake basin being bordering on closing, by strong evaporation, causes in formation fluid18O is enriched with, and deposition fossil fluid is seals type subsurface brine up for safekeeping.Result SHAHEJIE FORMATION lake water paleosalinity calculated according to Qian et al (1982), four sections of (ES of SHAHEJIE FORMATION4) ancient connate water is saline.Four sections of (ES of SHAHEJIE FORMATION4It is found to have euryhalinous organism Eucypris and Candona common in salt lake in), further demonstrate that this viewpoint.At CO2In the stage of filling, carry CO2Underground hydrothermal solution upwards migrate along fracture belt, mix with the type subsurface brine of sealing up for safekeeping, paleosalinity Z value > 120, show as high salinity fluid；And part paleosalinity Z value < 120, show system opposing open residing for formation fluid, it is possible to by permeability unit, link up with the surface fresh water with light isotope feature, isotopic Exchange occurs.Therefore, the formation fluid forming dawsonite predominantly seals type subsurface brine up for safekeeping, by magmatic activity and Atmospheric precipitation function influence, is mixed into underground hydrothermal solution and surface fresh water.
F is according to CO2Filling sequential, according to the different types of mineral formation time, determine diagenesis paragenetic sequence, it is judged that diagenetic stage, thus divide authigenic mineral combination, summary sandstone characteristic of fluid now and fossil fluid feature and authigenic mineral combination prepare CO2Inject the Diagenesis fluids evolutionary pattern figure before and after sandstone, the CO on this detection ground of deriving according to ideograph2Inject Diagenesis fluids evolutionary process before and after sandstone；
Precipitation and the dissolving of authigenic mineral are all the responses to formation fluid qualitative change, it is possible to reflection Diagenesis fluids environmental characteristic.According to CO2Fill sequential, segment out five set authigenic mineral combinations: micrite/sparry calcite (A) combines in early days, secondary enlargement is quartzy and kaolinite combines, calcite (B in late period1), ferrocalcite (A) and illite combination, dawsonite and calcite (B in late period2) combine and ferrocalcite (B), ankerite, siderite and Pyrite Assemblage, represent the formation fluid feature (Fig. 3) of different phase respectively.
First set combines: micrite/sparry calcite (A) combination in early days, indicates that formation fluid environment is for alkalescence.Diagenesis system is NaCl-KCl-CaCl2-H2O system.Study area sandstone is in the early diagenesis phase, and Compaction is to make the topmost factor of rock bonding diagenesis, causes the close-packed arrays of sandstone granule, displacement and reallocation, plastic rock debris generation plastic deformation, causes primary intergranular pore to be lost in a large number.In the diagenesis morning phase A phase, diagenesis alkaline environment in early days is inherited by sedimentary water body.Study area is positioned at the mechanical deposit district of lake basin gentle slope belt, and in sandstone, micrite calcite is grown, and its material source is more complicated, may directly separate out from supersaturation alkaline lake-water medium, it is also possible to the carbonatite chip from source of parents district dissolves and forms.In diagenesis B phase morning, being still in shallow embedding due to deposit and hide the stage, sand layers connectedness is relatively preferable, formation fluid system opposing open.Sand disaster treatment (ES3) bottom and four sections of (ES4) top grow have cream rock interlayer, affected by compaction, dehydration release rich in Ca2+Alkaline fluids, it is possible to for calcite formed provide material base.Four sections of (ES of SHAHEJIE FORMATION4) the biological shell of extensive development dissolves, ion can be with the form reprecipitation of calcite cement after redistribution., being affected by Atmospheric precipitation, surface fresh water can be exchanged in diagenesis system by permeability unit meanwhile.This kind of fluid has stronger oxidisability, and Fe and Mn content is relatively low.It is generally believed that sparry calcite is that air phreatic zone transforms diagenetic product in sandstone.
Second set combination: secondary enlargement quartz and kaolinite combine, indicates that formation fluid environment is for acidity.Diagenesis system is CO2-NaCl-KCl-AlCl3-H2O system.Study area sandstone is in the middle diagenesis A phase.Affected by magmatic activity and abstriction, formation fluid system opposing open, carried CO2Underground hydrothermal solution along fracture belt enter Diagenesis fluids system, pCO2Rise.Meanwhile, CO2Enter after sandstone formation and quickly form acidic fluid environment, see formula:
This process promotes corrosion dissolving and the growth of secondary pore of unstable mineral in sandstone, improves sandstone physical property.Meanwhile, carbonation can promote the aqueous solution dissociating power to mineral；The lysigenous aluminosilicate of feldspar corrosion can migrate with complicated organic complex form, thus improves the solvability of Anhydrite.Kaolinite is the feature product of aluminium silicate mineral corrosion in early days.The rich aluminium mineral such as Anhydrite is under the conditions of acid medium, with CO2Fluid interaction, Precipitation kaolinite, see formula: 4 (Na, K) AlSi3O8+2CO2+4H2O→Al4(Si4O10)(OH)8( Kaolinite )+8SiO2( Quartz cement )+2(Na,K)2CO3
Corrosion dissolution and pressolution can result in the SiO in formation fluid2Supersaturation, after transfer, reprecipitation separates out secondary siliceors cement, it is possible to occur with the form on quartz secondary limit.Kaolinite in sandstones with dawsonite, quartz overgrowth are the authigenic mineral formed under same acidic fluid environment, and its formation should be quasi-instantaneous.
3rd set combination: late period calcite (B1), ferrocalcite (A) and illite combination, indicate that formation fluid environment is alkalescence.Diagenesis system is CO2-NaCl-KCl-CaCl2-FeCl2-H2O system.Sandstones with dawsonite is in middle diagenesis B phase, R0For 1.3-2.0%.The H consumed in formation fluid is dissolved in the corrosion of unstable mineral (such as Anhydrite)+, formation fluid concentration has certain reinforcement, alkalescence effect to strengthen.Illite is formed at acidic fluid in the environment of meta-alkalescence transitional fluid, and this process is mainly K in formation fluid+/ potassium feldspar is lacking enough H with kaolinite+The condition generation illitization of concentration.Dynamics simulation confirms as K in pore-fluid+/H+K when ionic activity is in below potassium feldspar saturation point, needed for illite growth+Mainly dissolved by potassium feldspar and provide, see formula: Al2Si2O5(OH)4( Kaolinite )+KAlSi3O8( Potassium feldspar )→KAl3Si3O10(OH)2( Illite )+2SiO2+H2O
When reaching more than potassium feldspar saturation point, extra K+For the main source of potassium in illite, see formula:
3Al2Si2O5(OH)4( Kaolinite )+2K+→2KAl3Si3O10(OH)2( Illite )+2H++3H2O
CO2The feldspar corrosion course of dissolution participated in is the main resources that later-period carbonate cement is formed, geochemistry numerical simulations: anorthite-CO2-H2The end product of O system is aragonite；Under natural conditions, aragonite is due to its unstability, finally translates into calcite.The Ca of release during Clay Mineral Transformation2+、Fe3+Also it is important material source.The formation fluid system of relative closure has stronger reproducibility, it is possible to by Fe3+It is reduced to Fe2+, promote the formation of ferrocalcite.
4th set combination: dawsonite and calcite (B in late period2) combination, indicate that formation fluid environment is for alkalescence.Diagenesis system is CO2-NaCl-KCl-AlCl3-CaCl2-H2O system.Study area sandstone is in the middle diagenesis B phase.Late cementation thing is filled in residue intergranular pore and secondary dissolution pore, reduces sandstone physical property.Increasing with buried depth, Compaction further enhances, and is compacted further by the secondary pore produced in the middle diagenesis A phase simultaneously, and sandstone physical property is deteriorated.HCO in formation fluid3 -Reach saturated.Anhydrite and the corrosion dissolving of carbonate in early days and the conversion of clay mineral promote Ca in Diagenesis fluids2+、Na+、Al3+The rising of content, the formation for later-period carbonate mineral provides sufficient material source.Dawsonite is formed at has high pCO2, rich in Na+、Al3+Alkaline fluids in, and at high pCO2Under conditions of can keep stablizing of its macroscopic property.Therefore, high pCO in diagenesis system2Alkaline fluids environment promote the Precipitation of dawsonite, see formula:
HCO3 -+Na++Al3++2H2O→NaAlCO3(OH)2( Dawsonite )+3H+
Wawersik finds that anorthite is at rich CO2Instability under fluid condition.One of product that calcite can convert to dawsonite as anorthite, is shown in formula:
CaAl2Si2O8( Anorthite )+2Na++3CO2+3H2O→2NaAlCO3(OH)2( Dawsonite )+CaCO3+2SiO2+2H+
5th set combination: ferrocalcite (B), ankerite, siderite and Pyrite Assemblage, indicates that formation fluid environment is alkalescence.Diagenesis system is CO2-NaCl-KCl-CaCl2-MgCl2-FeCl2-H2O system.Study area sandstone is in the middle diagenesis B phase.Increasing with buried depth, this stage Diagenesis fluids environment is more closed, and organic cracking, the reproducibility hydro carbons of effusion cause fluid system reproducibility to strengthen；The release of organic acid will also result in formation fluid basicity and reduces.Due to the consumption of the carbonate mineral precipitations such as dawsonite, pCO in system can be caused2Reducing, dawsonite cannot continue precipitation, and part is to pCO2The relatively low later-period carbonate mineral of demand can precipitate, be filled in residue intergranular pore and secondary dissolution pore.Organic generally with form and the clay mineral composition organic clay complex of chemical bond or absorption, it is possible to absorption Ca2+、Fe3+、Mg2+Deng metal cation.During diagenesis evolution, organic matter can discharge above-mentioned metal cation in maturation process again.At low pCO2Reduction system in, Fe2+Easily enter carbonate mineral lattice, see formula:
HCO3 -+Fe2++OH-→FeCO3( Siderite )+H2O
nFe2++CaCO3→Ca1-nFenCO3( Ferrocalcite )+nCa2+
CaMg(CO3)2+nFe2+→CaMg1-nFen(CO3)2( Ankerite )+nMg2+
Meanwhile, Fe in authigenic mineral in this in period2+Content is higher, thus it is speculated that be probably the H receiving organic matter evolution release2The reduction impact of S；Pyrite cement during thin slice is observed further demonstrate that this supposition.
To sum up, the present invention is to sandstones with dawsonite petrology and the systematic study of Diagenesis fluids feature, it is possible to divide authigenic mineral combination, changing of fluid properties and the mineral formed is connected.In conjunction with fossil fluid and characteristic of fluid now, thus the evolutionary process of Diagenesis fluids of deriving.The method can be quantitative judgement CO2Inject the Diagenesis fluids evolutionary process after sandstone, for CO2Geological storage research provides a kind of new thinking, has reasonably recognized CO2Formation fluid property change after filling, is also beneficial to the diagenesis information deeper into ground research sandstones with dawsonite and CO2The problems such as geological storage feasibility.

Claims (6)

1. the method judging carbon dioxide injection sandstone deuterogene rock fluid Evolution process, it is characterised in that comprising the concrete steps that of the method:
Take the sandstones with dawsonite on detection ground as natural analog；
According to Arthroscopic characteristic, it is judged that CO2Inject the diagenesis paragenetic sequence after sandstone；
Diagenetic stage is judged according to Clay Minerals In Sandstones composition, the highest pyrolysis temperature of organic matter, reflectance of vitrinite；
According to formation water feature now, it is judged that sandstone characteristic of fluid now；
Oxygen and carbon isotopes composition according to dawsonite calculates fossil fluid salinity, determines the fossil fluid feature forming dawsonite；
According to CO2Fill sequential, according to the different types of mineral formation time, determine diagenesis paragenetic sequence, it is judged that diagenetic stage, Thus dividing authigenic mineral combination, summary sandstone characteristic of fluid now and fossil fluid feature and authigenic mineral combination are prepared into To CO2Inject the Diagenesis fluids evolutionary pattern figure after sandstone, the CO on this detection ground of deriving according to ideograph2Inject sandstone deuterogene rock Fluid Evolution process.
The method of judgement carbon dioxide injection sandstone deuterogene rock fluid Evolution process the most according to claim 1, it is characterised in that The acquisition methods of described Arthroscopic characteristic is for using Alizarin red staining leaf optical microscope lens-belowed identifying and SEM scanning electron microscopy The method of mirror metal spraying thin section identification.
The method of judgement carbon dioxide injection sandstone deuterogene rock fluid Evolution process the most according to claim 1, it is characterised in that The determination method of described diagenesis paragenetic sequence specifically includes that the mineral being initially formed are attached to the surface of detrital grain；The ore deposit that evening is formed Thing is filled in residual pore space；Explanation authigenic mineral person in early days, formation should be later than authigenic mineral in early days；Adhesion or embedding brilliant mineral Formed later；Late period, authigenic mineral growth was limited by authigenic mineral in early days.
The method of judgement carbon dioxide injection sandstone deuterogene rock fluid Evolution process the most according to claim 1, it is characterised in that The method of described acquisition formation water feature now is: sampling obtains formation water sample now, laboratory measurement, measures stratum now The pH of water and ion composition, judge formation water feature now by Su Lin formation water water type splitting scheme.
The method of judgement carbon dioxide injection sandstone deuterogene rock fluid Evolution process the most according to claim 4, it is characterised in that Described Su Lin formation water water type splitting scheme is for passing through Na+/Cl-、(Na+-Cl-)/SO4 2-、(Cl--Na+)/Mg2+、SO4 2-/Cl- The method judging water type, (Na+-Cl-)/SO4 2-> 1 it is sodium bicarbonate type (NaHCO3)；(Cl--Na+)/Mg2+> 1 for chlorination Calcium (CaCl2)；(Na+-Cl-)/SO4 2-< 1 is sodium sulfate type (Na2SO4)；(Cl--Na+)/Mg2+< 1 is chloride-magnesium type (MgCl2)。
The method of judgement carbon dioxide injection sandstone deuterogene rock fluid Evolution process the most according to claim 1, it is characterised in that The described oxygen and carbon isotopes according to dawsonite forms the method for calculating fossil fluid salinity: determine the δ of dawsonite13CPDBValue Distribution, δ18OPDBThe distribution of value, according to δ18OSMOWWith δ18OPDBReduction formula, is shown in formula: δ18OSMOW =1.03091 δ18OPDB+ 30.91, calculate δ18OSMOWThe distribution of value；
Use the empirical equation that Keith and Weber (1964) proposes, calculate paleosalinity Z of the formation fluid forming dawsonite Value: Z=a (δ13CPDB+50)+b(δ18OPDB+ 50), a=2.048, b=0.498 in above formula；When Z value > 120 time be sea Water or Hunan, lake salt water medium, Z value<being fresh water medium when 120, if Z Distribution value scope is existing>120 also have<120, shape is described The formation fluid becoming dawsonite has mixed sources.
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