CN105911259B - Judge the method for carbon dioxide injection sandstone deuterogene rock fluid Evolution process - Google Patents
Judge the method for carbon dioxide injection sandstone deuterogene rock fluid Evolution process Download PDFInfo
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Abstract
It is more particularly to a kind of to judge CO the present invention relates to sandstone fluid Evolution field2Inject the method for sandstone deuterogene rock fluid Evolution process.The present invention takes sandstones with dawsonite to be sampled as natural analog, and with reference to fossil fluid and characteristic of fluid and authigenic mineral combination now determines CO2The Diagenesis fluids evolutionary process injected before and after sandstone.Rational judgment CO2The method for the Diagenesis fluids evolutionary process injected after sandstone is CO2Geological storage research provides a kind of new thinking, with CO2Tracing mineral dawsonite is core, can be CO2Evolutionary process provides the understanding of more simple and clear after injection reservoir.
Description
Technical field
It is more particularly to a kind of to judge CO the present invention relates to sandstone fluid Evolution field2Diagenesis fluids after injection sandstone are drilled
The method of change process.
Background technology
CO2Trapping and geological storage (CCS) be reduce greenhouse gas emission, the main path that mitigation of global climate warms
(Holloway,2004；Enting et al.,2008,Benson and Cole,2008；Oelkers and Cole,
2008), i.e., by manual type by CO caused by industry2Inject in subsurface wastewater infiltration system reservoir, pass through construction and stratigraphic trap
The modes such as capture, hydrodynamic force capture, dissolving capture, mineral capture sealed up for safekeeping for a long time (Xu et al., 2006；Bachu et
al.,2007；Gaus,2010；Depaola and Cole, 2013), so as to reduce the carbon emission amount to air.By CO2Injection
In underground deep permeability reservoir, it is considered as long-term CO that " fixation ", which gets off, in the form of stable carbonate mineral2Seal up for safekeeping most
Stable approach (Bachu et al., 2004；IPCC,2005).Numerical simulation and water-rock experiment show：Dawsonite is CO2
It is injected into the trap CO formed after sandstone2One of essential mineral (Xu et al., 2004,2005；Zerai et al.,
2006).Field observation is shown：The appearance of dawsonite and Regional Magmatic activity and abstriction are closely connected (Golab et
al.,2006；Moore et al.,2009).Dawsonite is formed at high pCO with it2, alkaline fluids environment, and often and CO2Gas
The characteristics of hiding phase association, is considered as CO2Fluid migration, " tracing mineral " (the Gao et al., 2005) of aggregation, and stable
" carbon sequestration mineral " (Worden, 2006).Pass through the stable carbonate mineral sequestration CO such as dawsonite2It is considered as effective approach
(Klusman,2003；Kharaka et al.,2006).
In the CCS engineerings carried out now, CO2It is more difficult pre- to changing caused by reservoir Minerals and fluid state after sealing up for safekeeping
Material.For CO2It is all that can CCS technologies pacify to be influenceed in reservoir with the interaction of mineral and to caused by properties of fluid in bearing stratum
The key used entirely.For the system research of sandstones with dawsonite petrology and Diagenesis fluids feature, be advantageous to reasonably recognize
Know CO2After filling formation fluid property change, be also beneficial to deeper into ground research sandstones with dawsonite diagenesis information and
CO2The problems such as geological storage feasibility.But existing technology is for CO2With the interaction of mineral and to reservoir in reservoir
It is mainly qualitative understanding to be influenceed caused by fluid properties, lacks the means of quantification, it is difficult to rational judgment CO2After injecting sandstone
Diagenesis fluids evolutionary process.
The content of the invention
The present invention is directed to deficiency of the prior art, there is provided one kind judges CO2Inject sandstone deuterogene rock fluid Evolution process
New method, be CO2Geological storage research provides a kind of new thinking, with CO2Tracing mineral-dawsonite is core, can
For CO2Evolutionary process provides the understanding of more simple and clear after injection reservoir.
The judgement CO of the present invention2Inject comprising the concrete steps that for the method for sandstone deuterogene rock fluid Evolution process：
The sandstones with dawsonite on detection ground is taken as natural analog；
According to Arthroscopic characteristic, CO is judged2The diagenesis paragenetic sequence injected after sandstone；
Formed according to Clay Minerals In Sandstones, organic matter highest pyrolysis temperature, reflectance of vitrinite judge diagenetic stage；
According to stratum water feature now, sandstone characteristic of fluid now is judged；
Formed according to the oxygen and carbon isotopes of dawsonite and calculate fossil fluid salinity, it is determined that the fossil fluid for forming dawsonite is special
Sign；
According to CO2Sequential is filled, according to the different types of mineral formation time, diagenesis paragenetic sequence is determined, judges diagenesis
Stage, so as to divide authigenic mineral combination, summary sandstone characteristic of fluid and paleocurrent body characteristicses and authigenic mineral group now
CO is prepared in conjunction2The Diagenesis fluids evolutionary pattern figure injected after sandstone, the CO2 that the detection ground is derived according to ideograph inject sand
Rock deuterogene rock fluid Evolution process.
Further, the Arthroscopic characteristic acquisition methods be using Alizarin red staining leaf optical microscope lens-belowed identifying and
The method of SEM SEM metal spraying thin section identifications.
Further, the determination method of the diagenesis paragenetic sequence mainly includes：The mineral being initially formed are attached to chip
The surface of grain；The mineral-filled that evening is formed is in residual pore space；Early stage authigenic mineral person is handed over, it is spontaneous that formation should be later than early stage
Mineral；Adhesion or embedding brilliant mineral formation are later；The growth of late period authigenic mineral is limited by early stage authigenic mineral.
Further, the method for the acquisition stratum water feature now is：Sampling obtains stratum water sample now, laboratory
Measurement, the pH of stratum water and ion form measure now, pass through Su Lin stratum water water type splitting scheme.
Further, Su Lin stratum water water type splitting scheme is to pass through Na+/Cl-、(Na+-Cl-)/SO4 2-、(Cl--Na+)/
Mg2+、SO4 2-/Cl-To judge the method for water type：
(Na+-Cl-)/SO4 2->1 is sodium bicarbonate type (NaHCO3)；(Cl--Na+)/Mg2+>1 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 according to the oxygen and carbon isotopes of dawsonite composition calculating fossil fluid salinity is：
The oxygen and carbon isotopes composition of dawsonite in sandstone is determined, determines the δ of dawsonite13CPDBThe distribution of value,
δ18OPDBThe distribution of value, according to δ18OSMOWWith δ18OPDBReduction formula, see formula：δ18OSMOW=1.03091 δ18OPDB+ 30.91,
Calculate δ18OSMOWThe distribution of value.
The empirical equation proposed using Keith and Weber (1964), calculate the ancient salt for the formation fluid for forming dawsonite
Spend Z values：Z=a (δ13CPDB+50)+b(δ18OPDB+ 50), a=2.048 in above formula, b=0.498；When Z values>When 120 for seawater or
Lake Hunan salt water medium, Z values<It is fresh water medium when 120, if Z Distribution value scopes are existing>120 also have<120, illustrate to form piece sodium aluminium
The formation fluid of stone has mixed sources.
The beneficial effects of the invention are as follows：What it is the present invention be directed to sandstones with dawsonite petrology and Diagenesis fluids feature is
System research, the judgement CO that can be quantified2The Diagenesis fluids evolutionary process injected after sandstone, is CO2Geological storage research provides one
The new thinking of kind, with CO2Tracing mineral-dawsonite is core, is advantageous to reasonably recognize CO2Formation fluid property after filling
Change, method of the invention are also beneficial to diagenesis information and CO deeper into ground research sandstones with dawsonite2Geological storage
The problems such as feasibility.
Brief description of the drawings
Fig. 1 is CO2The diagenesis paragenetic sequence figure injected after sandstone；
Fig. 2 is stratum water characteristic pattern now；
Fig. 3 is Diagenesis fluids evolutionary process figure；
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example only section Example of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
On the one hand the embodiment of the present invention provides one kind and judges CO2Inject the tool of sandstone deuterogene rock fluid Evolution process approach
Body step is：
The sandstones with dawsonite on detection ground is taken as natural analog；
According to Arthroscopic characteristic, CO is judged2The diagenesis paragenetic sequence injected after sandstone；
Formed according to Clay Minerals In Sandstones, organic matter highest pyrolysis temperature, reflectance of vitrinite judge diagenetic stage；
According to stratum water feature now, sandstone characteristic of fluid now is judged；
Formed according to the oxygen and carbon isotopes of dawsonite and calculate fossil fluid salinity, it is determined that the fossil fluid for forming dawsonite is special
Sign；
According to CO2Sequential is filled, according to the different types of mineral formation time, diagenesis paragenetic sequence is determined, judges diagenesis
Stage, so as to divide authigenic mineral combination, summary sandstone characteristic of fluid and paleocurrent body characteristicses and authigenic mineral group now
CO is prepared in conjunction2The Diagenesis fluids evolutionary pattern figure injected before and after sandstone, the CO on the detection ground is derived according to ideograph2Injection
Diagenesis fluids evolutionary process before and after sandstone.
In one embodiment of this invention, above-mentioned four steps taken after dawsonite, i.e., according to Arthroscopic characteristic, judge
CO2The diagenesis paragenetic sequence injected after sandstone；Formed according to Clay Minerals In Sandstones, organic matter highest pyrolysis temperature, vitrinite
Reflectivity judges diagenetic stage；According to stratum water feature now, sandstone characteristic of fluid now is judged；According to the carbon oxygen of dawsonite
Isotopics calculate fossil fluid salinity, it is determined that the paleocurrent body characteristicses of dawsonite are formed, can be as needed in normal ranges
Interior adjustment sequencing.
In one embodiment of this invention, Arthroscopic characteristic acquisition methods are using Alizarin red staining leaf optical microscope mirror
Lower identification and the method for SEM SEM metal spraying thin section identifications, both approaches enable to acquisition feature accurate.
In one embodiment of this invention, the determination method of diagenesis paragenetic sequence mainly includes：The mineral attachment being initially formed
In the surface of detrital grain；The mineral-filled that evening is formed is in residual pore space；Early stage authigenic mineral person is handed over, formation should be later than
Early stage authigenic mineral；Adhesion or embedding brilliant mineral formation are later；The growth of late period authigenic mineral is limited by early stage authigenic mineral.It is above-mentioned
The method of determination can determine to detect the change of sample diagenesis paragenetic sequence over time.
In one embodiment of this invention, the method for obtaining stratum water feature now is：Sampling obtains stratum water sample now
Product, laboratory measurement, the pH of stratum water and ion form measure now, pass through Su Lin stratum water water type splitting scheme.
Specifically, Su Lin stratum water water type splitting scheme is to pass through Na+/Cl-、(Na+-Cl-)/SO4 2-、(Cl--Na+)/Mg2 +、SO4 2-/Cl-To judge the method for water type：
(Na+-Cl-)/SO4 2->1 is sodium bicarbonate type (NaHCO3)；(Cl--Na+)/Mg2+>1 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, the method for calculating fossil fluid salinity is formed according to the oxygen and carbon isotopes of dawsonite
For：
The oxygen and carbon isotopes composition of dawsonite in sandstone is determined, determines the δ of dawsonite13CPDBThe distribution of value,
δ18OPDBThe distribution of value, according to δ18OSMOWWith δ18OPDBReduction formula, see formula：δ18OSMOW=1.03091 δ18OPDB+ 30.91,
Calculate δ18OSMOWThe distribution of value.
The empirical equation proposed using Keith and Weber (1964), calculate the ancient salt for the formation fluid for forming dawsonite
Spend Z values：Z=a (δ13CPDB+50)+b(δ18OPDB+ 50), a=2.048 in above formula, b=0.498；When Z values>When 120 for seawater or
Lake Hunan salt water medium, Z values<It is fresh water medium when 120, if Z Distribution value scopes are existing>120 also have<120, illustrate to form piece sodium aluminium
The formation fluid of stone has mixed sources.
In order to become apparent from introducing the judgement CO that the embodiment of the present invention is provided in detail2Inject sandstone deuterogene rock fluid Evolution
The method of process, is illustrated below with reference to specific embodiment.
Using Dongying, hollowly area as example, judges CO2Inject the method specific steps of sandstone deuterogene rock fluid Evolution process
It is：
A takes detection ground sandstones with dawsonite to be studied as natural analog, sampling；
B judges CO according to Arthroscopic characteristic2The diagenesis paragenetic sequence injected after sandstone；CO is indicated referring to Fig. 1, Fig. 12Injection
After sandstone, with the passage of Geologic Time, the formation order of sandstone, i.e. diagenesis paragenetic sequence collection of illustrative plates.
C forms according to Clay Minerals In Sandstones, organic matter highest pyrolysis temperature, reflectance of vitrinite judge diagenetic stage；
By judging, the diagenetic stage of sandstones with dawsonite predominantly in the diagenesis A phases, partly up to the middle diagenesis B phases, its
Material evidence is as follows：1. smectite mixes layer than average out to 20%, smectite (S) layer proportion in Iraq/Mongolia mixes layer (I/S) is special
Point reflects that organic matter is in half ripe-stage of ripeness, therefore the diagenetic stage belongs to the middle diagenesis A-B phases；2. middle diagenesis rank
The reflectance of vitrinite (Ro) of section be 0.5-1.3%, reflectance of vitrinite 0.51-0.77%, therefore diagenetic stage category
In the middle diagenesis A phases；3. highest pyrolysis temperature is 430~450 DEG C, 443 DEG C of average out to, pyrolysis temperature peak temperature is mostly focused on 440-
Between 450 DEG C, a small amount of pyrolysis temperature is less than 435 DEG C, is the middle diagenesis B phases.
D judges sandstone characteristic of fluid now according to stratum water feature now；
It is determined that water feature in stratum is as shown in Fig. 2 according to Dongying Depression SHAHEJIE FORMATION sandstones with dawsonite (Fig. 2 now
It is middle a) and common sandstone in stratum water water sample analysis data (Fig. 2) and Song-liao basin Changling Sag (c in Fig. 2) and Hailaer basin
The Comparison of Geochemical Features of ground Wuerxun-Beier Sag sandstones with dawsonite water sample analysis data (d in Fig. 2), and in common sandstone
Stratum water is compared, and sandstones with dawsonite stratum water has the HCO of obvious high content3 -, it is mainly derived from CO2It is fluid-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
Stratum aqueous nature is controlled by CO in research area's sandstone2Distribution.The salinity of stratum water can reflect stratum sealing strip simultaneously
The quality of part, the good interval of sealing condition, the salinity of stratum water are of a relatively high.Therefore stratum water is characterized in that closure is weak now
Alkaline NaHCO3Stratum water.
E is formed according to the oxygen and carbon isotopes of dawsonite and is calculated fossil fluid salinity, it is determined that forming the fossil fluid of dawsonite
Feature；
It is determined that form the paleocurrent body characteristicses of dawsonite：Study the δ of area's 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,
See formula：δ18OSMOW=1.03091 δ18OPDB+ 30.91, calculate δ18OSMOWThe distribution of value is+17.16~+19.76 ‰.
The dawsonite isotopics of table 1
*According to O ' Neil (1969) CaCO3-H2The formation fluid for the dawsonite balance that O HYDROGEN ISOTOPE EQUILIBRIUM FRACTIONATION BETWEEN equations calculate
δ18O values
Due to CaCO3-H2O Equilibrium fractionation factors and dawsonite-H2O Equilibrium fractionation factor approximately equals, therefore, according to
CaCO3-H2O system Fractionation Equations, calculate the formation fluid δ with dawsonite balance18OH2OIt is worth for -2.07~+0.35 ‰
(table 1).
δ18OCaCO3-δ18OH2O=2.78 × 106/T2–2.89
In above formula：δ18OCaCO3For the δ of dawsonite18OSMOWValue；δ18OH2OFor the formation fluid that is balanced with dawsonite
Oxygen isotope value.According to CaCO3-H2The δ with the formation fluid of dawsonite balance that O Fractionation Equations calculate18OH2OBe worth for-
2.07~+0.35 ‰ (table 1).Normally descend the δ of hydrothermal solution18OH2OIt is+6~+10 ‰ to be worth scope, the δ of Atmospheric precipitation18OH2OValue one
As be less than -2 ‰, seal the δ of type subsurface brine up for safekeeping18OH2OIt is -2~+6 ‰ to be worth scope.With the formation fluid of dawsonite balance
δ18OH2Oδ of the value in subsurface brine18OH2OIn the range of value, research is thought to form the fluid of dawsonite predominantly with sealing type up for safekeeping
Lower bittern.
In order to further analyze fluid properties, using the empirical equation of Keith and Weber (1964) propositions, calculate and formed
The paleosalinity Z values of the formation fluid of dawsonite, are shown in formula：Z=a (δ13CPDB+50)+b(δ18OPDB+50)
A=2.048 in above formula, b=0.498；When Z values>It is seawater or lake Hunan salt water medium when 120, Z values<To be light when 120
Aqueous medium.Z Distribution values scope is 116.64~128.92, thus it is speculated that forming the formation fluid of dawsonite may have mixed source special
Sign.
Calmodulin binding domain CaM geologic information, four sections of (ES of SHAHEJIE FORMATION4) deposition period weather is more arid, Bohai gulf basin is to be bordering on
The salt lake of closing-brackish water lake basin, by strong evaporation, causes in formation fluid18O is enriched with, and deposition fossil fluid is
Seal type subsurface brine up for safekeeping.The result calculated according to Qian et al (1982) to SHAHEJIE FORMATION lake water paleosalinity, SHAHEJIE FORMATION four
Section (ES4) ancient connate water is salt solution.Four sections of (ES of SHAHEJIE FORMATION4) in find have euryhalinous organism Eucypris common in salt lake
And Candona, it further demonstrate the viewpoint.In CO2In the filling stage, carry CO2Underground hydrothermal solution migrated upwards along fracture belt,
Mixed with sealing type subsurface brine up for safekeeping, paleosalinity Z values>120, show as high salinity fluid；And part paleosalinity Z values<120, show
System opposing open residing for formation fluid, it can be linked up by permeability unit with the surface fresh water with light isotope feature,
Generation isotope exchanges.Therefore, the formation fluid for forming dawsonite predominantly seals type subsurface brine up for safekeeping, by magmatic activity and
Atmospheric precipitation function influence, it is mixed into underground hydrothermal solution and surface fresh water.
F is according to CO2Sequential is filled, according to the different types of mineral formation time, diagenesis paragenetic sequence is determined, judges diagenesis
Stage, so as to divide authigenic mineral combination, summary sandstone characteristic of fluid and paleocurrent body characteristicses and authigenic mineral group now
CO is prepared in conjunction2The Diagenesis fluids evolutionary pattern figure injected before and after sandstone, the CO on the detection ground is derived according to ideograph2Injection
Diagenesis fluids evolutionary process before and after sandstone；
The precipitation of authigenic mineral and dissolving are the responses to formation fluid change of properties, can reflect Diagenesis fluids environment
Feature.According to CO2Sequential is filled, segments out five sets of authigenic mineral combinations：The combination of early stage micrite/sparry calcite (A), it is secondary plus
Big quartz and kaolinite combination, late period calcite (B1), ferrocalcite (A) and illite combination, dawsonite and late period side solution
Stone (B2) combination and ferrocalcite (B), ankerite, siderite and Pyrite Assemblage, the stratum of different phase is represented respectively
Characteristic of fluid (Fig. 3).
First set combines：Early stage micrite/sparry calcite (A) combination, indicates formation fluid environment for alkalescence.Into rock mass
It is for NaCl-KCl-CaCl2-H2O systems.Research area's sandstone is in the early diagenesis phase, and Compaction is to make rock bonding diagenesis
Most important factor, close-packed arrays, displacement and the reallocation of sandstone particle are caused, plastic rock debris is plastically deformed, and causes original
Raw intergranular pore is largely lost.In early phase diagenesis phase A, the alkaline environment of diagenesis early stage be by sedimentary water body succession Lai.Study area
In the mechanical deposit area of lake basin gentle slope belt, sandstone micrite calcite develop, its material source is more complicated, may directly from
Separated out in supersaturated alkaline lake-water medium, it is also possible to which the carbonatite chip dissolving from source of parents area forms.In the early diagenesis B phases, by
The stage still is hidden in shallow embedding in deposit, sandstone layer connectivity is relatively good, formation fluid system opposing open.SHAHEJIE FORMATION three
Section (ES3) bottom and four sections of (ES4) top development have cream rock interlayer, influenceed by compaction, dehydration release is rich in Ca2+Alkali
Property fluid, can for calcite formed material base be provided.Four sections of (ES of SHAHEJIE FORMATION4) extensive development biological shell occur
Dissolving, ion after redistribution can in the form of calcite cement reprecipitation.Meanwhile influenceed by Atmospheric precipitation, ground
Table fresh water can be by permeability unit with being exchanged in diagenesis system.This kind of fluid has stronger oxidisability, and iron, manganese
Ion concentration is relatively low.It is generally believed that sparry calcite is that air phreatic zone transforms diagenetic product in sandstone.
Second set of combination：Secondary enlargement quartz and kaolinite combination, indicate formation fluid environment for acidity.Diagenesis system
For CO2-NaCl-KCl-AlCl3-H2O systems.Research area's sandstone is in the middle diagenesis A phases.By magmatic activity and abstriction shadow
Ring, formation fluid system opposing open, carry CO2Underground hydrothermal solution enter Diagenesis fluids system, pCO along fracture belt2Rise.Together
When, CO2Acidic fluid environment is quickly formed after into sandstone formation, sees formula：
This process promotes the corrosion dissolving of unstable mineral in sandstone and the development of secondary pore, improves sandstone thing
Property.Meanwhile carbonation can promote dissociating power of the aqueous solution to mineral；The lysigenous aluminosilicate energy of feldspar corrosion
It is enough to be migrated in the form of the organic complex of complexity, so as to improve the solvability of feldspar.Kaolinite is early stage manosil AS
The feature product of salt mineral dissolution.The rich aluminium mineral such as feldspar is under the conditions of acid medium, with CO2Fluid interaction, precipitation analysis
Go out kaolinite, see formula：4(Na,K)AlSi3O8+2CO2+4H2O→Al4(Si4O10)(OH)8 (kaolinites)+8SiO2 (quartz cements)+2(Na,
K)2CO3
Corrosion dissolution and pressolution can result in the SiO in formation fluid2Supersaturation, reprecipitation is analysed after transfer
Go out secondary siliceors cement, can occur in the form of quartz secondary side.Kaolinite, quartz in sandstones with dawsonite is secondary
The authigenic mineral to be formed under same acidic fluid environment is increased, its formation should be quasi-instantaneous.
3rd set of combination：Late period calcite (B1), ferrocalcite (A) and illite combination, indicate formation fluid environment
For alkalescent.Diagenesis system is CO2-NaCl-KCl-CaCl2-FeCl2-H2O systems.Sandstones with dawsonite is in middle diagenesis B
Phase, R0For 1.3-2.0%.H in the corrosion dissolving consumption formation fluid of unstable mineral (such as feldspar)+, formation fluid concentration has
It is certain to strengthen, alkalescence effect enhancing.Illite is formed at acidic fluid into the environment of meta-alkalescence transitional fluid, this process master
If K in formation fluid+/ potassium feldspar is lacking enough H with kaolinite+Illitization occurs for the condition of concentration.Dynamics simulation is demonstrate,proved
It is real to work as K in pore-fluid+/H+When ionic activity is in below potassium feldspar saturation point, the K needed for illite growth+Mainly grown by potassium
Stone dissolving provides, and sees formula：Al2Si2O5(OH)4 (kaolinites)+KAlSi3O8 (potassium feldspars)→KAl3Si3O10(OH)2 (illites)+2SiO2+H2O
When reaching more than potassium feldspar saturation point, extra K+For the main source of potassium in illite, formula is seen：
3Al2Si2O5(OH)4 (kaolinites)+2K+→2KAl3Si3O10(OH)2 (illites)+2H++3H2O
CO2The feldspar corrosion course of dissolution of participation is the main resources that later-period carbonate cement is formed, geochemical
Learn numerical simulations：Anorthite-CO2-H2The final product of O systems is aragonite；Aragonite is because its is unstable under natural conditions
Property, finally translate into calcite.The Ca discharged during Clay Mineral Transformation2+、Fe3+And important material source.Relatively
The formation fluid system of closing has stronger reproducibility, can be by Fe3+It is reduced to Fe2+, promote the formation of ferrocalcite.
4th set of combination：Dawsonite and late period calcite (B2) combination, indicate formation fluid environment for alkalescence.Diagenesis
System is CO2-NaCl-KCl-AlCl3-CaCl2-H2O systems.Research area's sandstone is in the middle diagenesis B phases.Late cementation thing fills
In remaining intergranular pore and secondary dissolution pore, sandstone physical property is reduced.Increase simultaneously with buried depth, Compaction further enhances, will
Further it is compacted in secondary pore caused by the middle diagenesis A phases, sandstone physical property is deteriorated.HCO in formation fluid3 -Reach saturation.Feldspar
The conversion of corrosion dissolving and clay mineral with early stage carbonate promotes Ca in Diagenesis fluids2+、Na+、Al3+The rise of content,
Sufficient material source is provided for the formation of later-period carbonate mineral.Dawsonite is formed at high pCO2, rich in Na+、Al3+'s
In alkaline fluids, and in high pCO2Under conditions of can keep the stabilization of its macroscopic property.Therefore, high pCO in diagenesis system2
Alkaline fluids environment promote the Precipitation of dawsonite, see formula：
HCO3 -+Na++Al3++2H2O→NaAlCO3(OH)2 (dawsonites)+3H+
Wawersik has found anorthite in rich CO2It is unstable under fluid condition.Calcite can be used as anorthite to piece sodium aluminium
One of product of stone conversion, is shown in formula：
CaAl2Si2O8 (anorthites)+2Na++3CO2+3H2O→2NaAlCO3(OH)2 (dawsonites)+CaCO3+2SiO2+2H+
5th set of combination：Ferrocalcite (B), ankerite, siderite and Pyrite Assemblage, indicate formation fluid environment
For alkalescent.Diagenesis system is CO2-NaCl-KCl-CaCl2-MgCl2-FeCl2-H2O systems.Research area's sandstone is in middle diagenesis B
Phase.Increase with buried depth, this stage Diagenesis fluids environment is more closed, and organic matter cracking, the reproducibility hydro carbons of effusion cause to flow
Body reduction system strengthens；The release of organic acid will also result in the reduction of formation fluid basicity.Due to carbonate mines such as dawsonites
The consumption of thing precipitation, can cause pCO in system2Reduce, dawsonite can not continue to precipitate, and part is to pCO2Demand is relatively low
Later-period carbonate mineral can precipitate, be filled in remaining intergranular pore and secondary dissolution pore.Organic matter is generally with chemical bond or absorption
Form and clay mineral composition organic clay complex, can adsorb Ca2+、Fe3+、Mg2+Deng metal cation.Diagenesis evolution mistake
Cheng Zhong, organic matter can discharge above-mentioned metal cation again in maturation.In low pCO2Reduction system in, Fe2+Very
Carbonate mineral lattice is easily accessible, sees formula：
HCO3 -+Fe2++OH-→FeCO3 (siderites)+H2O
nFe2++CaCO3→Ca1-nFenCO3 (ferrocalcites)+nCa2+
CaMg(CO3)2+nFe2+→CaMg1-nFen(CO3)2 (ankerites)+nMg2+
Meanwhile Fe in this period authigenic mineral2+Content is higher, thus it is speculated that is probably to receive what organic matter evolution discharged
H2S reduction influences；Pyrite cement in thin slice observation further demonstrate this supposition.
To sum up, system research of the present invention to sandstones with dawsonite petrology and Diagenesis fluids feature, can be partitioned from
Raw mineral assemblage, the change of fluid properties is connected with the mineral formed.With reference to fossil fluid and now characteristic of fluid, so as to
Derive the evolutionary process of Diagenesis fluids.The judgement CO that this method can quantify2The Diagenesis fluids evolutionary process injected after sandstone, it is
CO2Geological storage research provides a kind of new thinking, has reasonably recognized CO2Formation fluid property changes after filling, also favorably
In diagenesis information and CO that sandstones with dawsonite is studied deeper into ground2The problems such as geological storage feasibility.
Claims (5)
1. judge the method for carbon dioxide injection sandstone deuterogene rock fluid Evolution process, it is characterised in that the specific step of this method
Suddenly it is：
The sandstones with dawsonite on detection ground is taken as natural analog；
According to Arthroscopic characteristic, CO is judged2The diagenesis paragenetic sequence injected after sandstone；
Formed according to Clay Minerals In Sandstones, organic matter highest pyrolysis temperature, reflectance of vitrinite judge diagenetic stage；
According to stratum water feature now, sandstone characteristic of fluid now is judged；
Formed according to the oxygen and carbon isotopes of dawsonite and calculate fossil fluid salinity, it is determined that forming the paleocurrent body characteristicses of dawsonite；
According to CO2Sequential is filled, according to the different types of mineral formation time, diagenesis paragenetic sequence is determined, judges diagenetic stage,
So as to divide authigenic mineral combination, now prepared by characteristic of fluid and the combination of paleocurrent body characteristicses and authigenic mineral for summary sandstone
Obtain CO2The Diagenesis fluids evolutionary pattern figure injected after sandstone, the CO on the detection ground is derived according to ideograph2Inject sandstone after into
Rock flow body evolutionary process；
It is described according to the oxygen and carbon isotopes of dawsonite form calculate fossil fluid salinity method be：Determine the δ of dawsonite13CPDBThe distribution of value, δ18OPDBThe distribution of value, according to δ18OSMOWWith δ18OPDBReduction formula, see formula：δ18OSMOW=
1.03091δ18OPDB+ 30.91, calculate δ18OSMOWThe distribution of value；
The empirical equation proposed using Keith and Weber (1964), calculate the paleosalinity Z for the formation fluid for forming dawsonite
Value：Z=a (δ13CPDB+50)+b(δ18OPDB+ 50), a=2.048 in above formula, b=0.498；When Z values>It is seawater or lake when 120
Hunan salt water medium, Z values<It is fresh water medium when 120, if Z Distribution value scopes are existing>120 also have<120, illustrate to form dawsonite
Formation fluid there are mixed sources.
2. the method according to claim 1 for judging carbon dioxide injection sandstone deuterogene rock fluid Evolution process, its feature
It is, the acquisition methods of the Arthroscopic characteristic are to scan electricity using Alizarin red staining leaf optical microscope lens-belowed identifying and SEM
The method of sub- microscope metal spraying thin section identification.
3. the method according to claim 1 for judging carbon dioxide injection sandstone deuterogene rock fluid Evolution process, its feature
It is, the determination method of the diagenesis paragenetic sequence mainly includes：The mineral being initially formed are attached to the surface of detrital grain；Late shape
Into mineral-filled in residual pore space；Early stage authigenic mineral person is handed over, formation should be later than early stage authigenic mineral；Adhesion is embedding
Brilliant mineral formation is later；The growth of late period authigenic mineral is limited by early stage authigenic mineral.
4. the method according to claim 1 for judging carbon dioxide injection sandstone deuterogene rock fluid Evolution process, its feature
It is, the method for the acquisition stratum water feature now is：Sampling obtains stratum water sample now, and laboratory measurement, measure is now
PH and the ion composition of modern stratum water, judge stratum water feature now by Su Lin stratum water water type splitting scheme.
5. the method according to claim 4 for judging carbon dioxide injection sandstone deuterogene rock fluid Evolution process, its feature
It is, the Su Lin stratum water water type splitting scheme is to pass through Na+/Cl-、(Na+-Cl-)/SO4 2-、(Cl--Na+)/Mg2+、SO4 2-/
Cl-To judge the method for water type, (Na+-Cl-)/SO4 2->1 is sodium bicarbonate type (NaHCO3)；(Cl--Na+)/Mg2+>1 is chlorination
Calcium (CaCl2)；(Na+-Cl-)/SO4 2-<1 is sodium sulfate type (Na2SO4)；(Cl--Na+)/Mg2+<1 is chloride-magnesium type (MgCl2)。
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