CN102748016A - Geologic history period sandstone reservoir porosity evolution recovery method - Google Patents
Geologic history period sandstone reservoir porosity evolution recovery method Download PDFInfo
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Abstract
The invention relates to a geologic history period sandstone reservoir porosity evolution recovery method which comprises the following steps: (1) establishing a sandstone reservoir diagenesis evolution sequence and a corresponding paleoburial depth of the reservoir during diagenesis; (2) establishing a normal compaction layout; (3) establishing a functional relationship between porosity and surface porosity; (4) carrying out sandstone reservoir porosity backstripping inversion under the restriction of the diagenesis sequence; (5) correcting by mechanical compaction and hot compaction; and (6) on the basis of the steps above, determining the true porosities of the main diagenetic stages, and establishing the geologic history period sandstone reservoir porosity evolution curve. The invention intensively solves the key problems of the determination of diagenesis occurrence time and paleoburial depth, the relationship between porosity and surface porosity, compaction correction and the like in the existing geologic history period sandstone reservoir porosity evolution recovery method, can effectively predict the porosity of the sandstone reservoir in the oil gas forming period, and provides instructions for effective evaluation on the reservoir.
Description
Technical field
The present invention relates to oil and gas exploration and development field, particularly a kind of earth history sandstone reservoir in period degree of porosity evolution restoration methods.
Background technology
Along with the demand that improves constantly and oil and gas reserves is increased of middle-shallow layer oil-gas exploration degree, the oil-gas exploration target turns to deep layer gradually, and China's deep layer oil gas resource potential is huge, and oil-gas exploration has obtained gratifying achievement.But deep layer oil gas enrichment discipline is extremely complicated, reservoir shows complicated characteristics such as " neglect oil and neglect water ", " neglect storage neglect do ", causes deep layer oil gas to prospect that difficulty is big, risk is high, success rate is low.The mid-deep strata sandstone reservoir has experienced the complicated diagenesis transformation in the process of burying; Earth history reservoir porosity in period has also experienced the complex evolution process, and the complexity of the matching relationship of reservoir porosity evolution history and primary rock producing hydrocarbon row hydrocarbon history is to cause mid-deep strata rich accumulation of oil and gas rule complicacy, the low major reason of exploration success rate.Chinese scholars is mainly utilized " strip is returned in inverting " principle at present; With the diagenesis evolution sequence is constraint; Area percentage according to various authigenic minerals and dissolution pore; The various diagenesis of quantitative calculation and analysis are finally recovered earth history sandstone reservoir in period degree of porosity and are developed the influence of sandstone reservoir degree of porosity.But prior art is only considered the contribution amount of various diagenesis to reservoir porosity, still has following problem: 1) confirm the absolute time that each diagenesis takes place and the ancient buried depth when taking place; 2) most scholars simply are equal to degree of porosity with face rate in the casting body flake, and still nobody carries out the research that human eye can be distinguished functional relation between apparent degree of porosity and the face rate of photopic vision; 3) restoration result does not carry out the compaction correction, but all degree of porosity of compaction loss are all summed up in the point that the diagenesis phase early.Along with improving constantly of oil-gas exploration degree, increasingly high to the requirement of degree of porosity evolution precision of prediction, art methods can not meet the demands, and needs more accurate earth history sandstone reservoir in the period degree of porosity evolution restoration methods of development.
Summary of the invention
The objective of the invention is to solve 3 problems that exist in existing earth history sandstone reservoir in the period degree of porosity evolution restoration methods, set up accurate more earth history sandstone reservoir in period degree of porosity evolution restoration methods.This method is a target with earth history sandstone reservoir in period degree of porosity evolution restoration methods; Adopt thin slice observation, scanning electron microscope analysis, graphical analysis, fluid inclusion analysis, degree of porosity test multiple technologies method; On the basis of deposition characteristics, the research of diagenesis evolution sequence; Emphasis solves and to concern between the confirming of each diagenesis takes place in existing earth history sandstone reservoir in the period degree of porosity evolution restoration methods time and ancient buried depth, degree of porosity and the face rate and key issue such as compaction correction; With casting body flake now the hole looks be the basis, be constraint with the diagenesis evolution sequence, the various diagenesis of quantitative analysis are to the influence of sandstone reservoir degree of porosity; Recovering earth history sandstone reservoir in period degree of porosity develops
Technical scheme of the present invention is: a kind of earth history sandstone reservoir in period degree of porosity evolution restoration methods, and concrete steps are following:
The first step: the corresponding ancient buried depth of reservoir when setting up the generation of sandstone reservoir diagenesis evolutionary series and diagenesis
To casting body flake now observe, scanning electron microscope analysis and fluid inclusion analysis; Analyze in conjunction with the diagenesis environmental evolution; Set up sandstone reservoir diagenesis evolutionary series,, confirm the time that each diagenesis begins and finishes according to the diagenesis evolution sequence of setting up; With these times project to recover on the individual well buried history of sample spot the corresponding ancient buried depth of reservoir when obtaining diagenesis and taking place;
Second step: set up normal compacting plate
The first, analyze deposit particle diameter, sorting and rigid particles content influence degree to compaction, confirm to influence the Dominated Factors of compaction; The second, from the sample of the existing actual measurement of study area rerum natura, select meet stratum normal pressure, cement content less than 5%, secondary pore content is less than 1% sample, as the sample under the normal compacting condition; The 3rd, with the sample under the selected normal compacting condition, divide different Dominated Factors to carry out the degree of depth and degree of porosity match, set up degree of porosity evolution curve, promptly can be used as the normal compacting plate of study area reservoir; The 4th, in conjunction with this area geothermal gradient evolution history, confirm the mean ground temperature gradient that target zone develops and experiences to now, the normal compacting plate of foundation can be thought the normal compacting plate under this mean ground temperature gradient control;
The 3rd step: set up the functional relation between degree of porosity and the face rate
Based on physics principle; The distinguishable photopic vision of human eye is about 0.1mm apart from the minimum air line distance of locating, and therefore, when the air line distance of microscopically 0.5 μ m is amplified 200 times, can be differentiated photopic vision by human eye; Promptly the pore radius that human eye can be differentiated photopic vision under 200 times of mirrors is 0.25 μ m; Based on above-mentioned situation, pore radius under 200 times of mirrors is considered as the micropore less than the hole of 0.25 μ m, when the concerning of statistics face rate and porosity, do not consider; Determine in the actual measurement porosity radius greater than the voids content of 0.25 μ m by means of pressing the mercury data; Just human eye can be asked under 200 times of mirrors and the photopic vision porosity can be differentiated; Be called apparent porosity, by casting body flake now, utilize its corresponding face rate of petrographic microscope and computer image analysis stroke analysis then; The face rate is carried out match with corresponding apparent porosity, just can set up the functional relation between face rate and the apparent porosity;
The 4th step: the sandstone reservoir porosity inversion under the constraint of diagenesis sequence is returned stripping
Being the basis with casting body flake pore character now, is constraint with the diagenesis evolution sequence, begins back stripping from the Final Issue diagenesis; Recover each phase diagenesis and begin preceding pore character, adopt the computer image analysis technology, each phase diagenesis of quantitative Analysis; Except the compaction; Reservoir face rate is influenced variable quantity, and based on the relation between face rate and the apparent porosity, the face rate in the casting body flake now is converted into corresponding apparent porosity; Recover that each diagenesis begins, the porosity when finishing, and then obtain the porosity under each ancient buried depth;
The 5th step: mechanical ramming effect and hot compaction effect are proofreaied and correct
Based on the diagenesis evolution sequence, before main cementation took place, sample was normal packing stage, and its compacting under each buried depth is decreased the hole amount and can be read based on the normal compacting plate with sample tool same characteristic features; And after beginning main glued period; Cementation has suppressed normally carrying out of compaction; The compacting in each period subtracts hole amount can be adopted compacting after main cementation begins always to subtract ratio that the hole amount subtracts the hole amount in each compacting in period on the normal compacting plate it is distributed and to confirm that the compacting in each diagenesis period subtracts the hole correcting value, the stripping porosity is returned in the inverting of step 4 gained carry out the mechanical ramming effect and proofread and correct; Then; Based on study area buried history and geothermal gradient evolution history; Confirm the mean ground temperature gradient and the ancient buried depth of each diagenesis experience in period, utilize ground temperature field and sandstone porosity graph of a relation, the stripping porosity is returned in the inverting of step 4 gained carry out hot compaction effect correction;
The 6th step: on the basis of above-mentioned steps, confirm each true degree of porosity of main diagenesis stage, set up earth history sandstone reservoir in period degree of porosity evolution curve.
Beneficial effect of the present invention is: the present invention is on the basis of deposition characteristics, the research of diagenesis evolution sequence; With casting body flake now the hole looks be the basis; With the diagenesis evolution sequence is constraint; Quantitative analysis the influences of various diagenesis to the sandstone reservoir degree of porosity, recovered earth history sandstone reservoir in period degree of porosity accurately and developed.Time and the ancient buried depth that each diagenesis that solved emphasis in existing earth history sandstone reservoir in the period degree of porosity evolution restoration methods takes place confirmed, concern between degree of porosity and the face rate and key issue such as compaction correction; Improved the precision of earth history sandstone reservoir in period hole evolution restoration methods; Effectively predicting oil becomes the degree of porosity of Tibetan sandstone reservoir in period, thereby guidance is provided for the reservoir efficiency evaluation.
Description of drawings
Fig. 1 is for recovering the individual well buried history of sample spot.
Fig. 2 is the normal compacting plate of reservoir under the different sortings of Shengli Oil Field somewhere Paleogene System sandstone.
Fig. 3 is the functional relation between Shengli Oil Field somewhere face rate and the apparent degree of porosity.
Fig. 4 is the rerum natura view in each diagenesis period of utilizing that inverting returns that strip recovers.
Fig. 5 is that Shengli Oil Field somewhere mechanical ramming is proofreaied and correct sketch map.
Fig. 6 is ground temperature field and Porosity of Sandstone graph of a relation.
Fig. 7 is certain well 3431.25m earth history reservoir porosity in period evolution curve.
The specific embodiment
The concrete technical scheme of this invention is described with Shengli Oil Field somewhere earth history sandstone reservoir in period degree of porosity evolution restoration methods:
The first step: the corresponding ancient buried depth of reservoir when setting up the generation of sandstone reservoir diagenesis evolutionary series and diagenesis
Utilize technology such as thin slice observation, scanning electron microscope analysis and fluid inclusion analysis, analyze in conjunction with the diagenesis environmental evolution, think that the husky four sections diagenesis evolution sequences in Shengli Oil Field somewhere are: apart from modern 42.5Ma, diagenesis is main with compaction apart from modern 44.5Ma-; Apart from modern 32Ma, compaction/feldspar dissolving/quartz strengthens apart from modern 42.5Ma-; Modern 32Ma-is apart from modern 24.6Ma for distance, compaction/quartz dissolution/carbonate cementation; Apart from modern 2Ma, compaction/carbonate cements is dissolved apart from modern 24.6Ma-; Apart from modern 2Ma-now, compaction/late period pyrite.
Based on the diagenesis evolution sequence of above-mentioned foundation, confirm the time that each diagenesis begins and finishes, with these times project to recover can obtain the ancient buried depth that each phase diagenesis begins and finishes on the individual well buried history (Fig. 1) of sample spot.With certain well 3431.25m is example, before modern about 45Ma, begins deposition, and ancient buried depth is 0m; Apart from modern 42.5Ma, the about 1350m of buried depth; Apart from modern 32Ma, the about 2520m of buried depth; Apart from modern 24.6Ma, the about 2800m of buried depth; Apart from modern 2Ma, the about 3360m of buried depth; Buried depth 3431.25m now.
Second step: set up normal compacting plate
The first, analyze the influence degree to compaction such as Shengli Oil Field somewhere deposit particle diameter, sorting and rigid particles content, think that influencing the Dominated Factors of compaction is the deposit sorting coefficient; The second, from the sample of the existing actual measurement of study area rerum natura, select meet stratum normal pressure, cement content less than 5%, the poor sample of secondary pore is less than 1%, as the sample under the normal compacting condition; The 3rd; With the sample under the selected normal compacting condition; Divide different Dominated Factors to carry out the degree of depth and degree of porosity match, set up sorting coefficient and be 1.5-1.75,1.75-2,2-2.5 and reached greater than the degree of porosity evolution curve under 2.5 the various sortings, as the normal compacting plate of study area reservoir (Fig. 2); The 4th, in conjunction with this area geothermal gradient evolution history, confirm that it is 3.87 ℃/100m that target zone develops to the mean ground temperature gradient that experiences now.The normal compacting plate of setting up can be thought the normal compacting plate under 3.87 ℃/100m of this mean ground temperature gradient control.
The 3rd step: set up the functional relation between degree of porosity and the face rate
Utilize a large amount of sample actual measurement degree of porosity; Can differentiate the apparent degree of porosity content of photopic vision in conjunction with human eye in the pressure mercury analysis actual measurement degree of porosity; Ask for apparent degree of porosity; To show degree of porosity then and carry out the function match, set up the functional relation (Fig. 3) between face rate and the apparent degree of porosity with corresponding casting body flake effective surface porosity.
The 4th step: the sandstone reservoir porosity inversion under the constraint of diagenesis sequence is returned stripping
With certain well 3431.25m is example (sorting coefficient 1.59), chooses the typical ken, carry out 3 row * 3 row the photo of totally 9 kens splice that (Fig. 4 a), surveying degree of porosity now is 11.7%; The carbonate cements dissolving produces 1.26% face rate (being converted into degree of porosity is 3.06%); The face rate (being converted into degree of porosity is 12.27%) of carbonate cementation loss 6.5%, quartz dissolution produces 0.15% face rate (being converted into degree of porosity is 0.5%), the quartzy loss face rate 0.06% (0.23%) that strengthens; Feldspar and landwaste dissolving produce 2.34% face rate (being converted into degree of porosity is 5.17%), and each diagenesis face in period rate characteristic is seen Fig. 4 b to 4-14g.
The 5th step: mechanical ramming effect and hot compaction effect are proofreaied and correct
1. the mechanical ramming effect is proofreaied and correct
With the Shengli Oil Field somewhere is that example describes, and supposes that it is φ that stripping feldspar dissolving/quartz increasing preceding (apart from modern 42.5Ma) degree of porosity is returned in inverting
11, the degree of porosity under the at this moment normal compacting situation is φ
1, this moment, true degree of porosity was φ
a, this stage compaction loss degree of porosity is φ
1 crushingTo return the stripping degree of porosity be φ in (apart from modern 32Ma) inverting when first phase acidic leach finished
21, corresponding normal compacting degree of porosity is φ
2, this stage compaction loss degree of porosity is φ
2 crushings, this moment, true degree of porosity was φ
bThe degree of porosity that (apart from modern 24.6Ma) returns the stripping recovery through inverting after the carbonate cementation and before the second phase acidic leach is φ
31, degree of porosity is φ under the normal compacting situation of corresponding same depth
3, this stage compaction loss degree of porosity is φ
3 crushings, this moment, true degree of porosity was φ
c, the degree of porosity that second phase acidic leach end (apart from modern 2Ma) is returned the stripping recovery through inverting is φ
41, degree of porosity is φ under the normal compacting situation of corresponding same depth
4, this stage compaction loss degree of porosity is φ
4 crushings, this moment, true degree of porosity was φ
d, the modern 2Ma of distance compaction loss degree of porosity so far is φ
5 crushings, corresponding true degree of porosity φ
e, i.e. φ
e=φ
Now(Fig. 5).
From the above, be not consider to draw under the situation of compaction loss because degree of porosity that strip draws is returned in inverting, this moment, real degree of porosity was greater than this value, i.e. φ
1＞φ
11,, be normal packing stage basically owing to do not experience gluing this period.Therefore, can think φ
a=φ
1, and the true degree of porosity φ of (feldspar dissolving, the quartzy increasing) after having experienced first phase acidic leach
bShould be normal compacting degree of porosity φ in this period
2Add feldspar solution porosity in this in period, deduct the quartzy loss degree of porosity that strengthens, this stage basically also can be regarded as normal compacting.After having experienced alkaline environment, the gluing of carbonate has taken place, a small amount of quartzy dissolving, mostly can suppress carry out of normal compacting because the general content of carbonate cements is higher this period, can not utilize normal compaction curve to ask for the true degree of porosity in this period.This stage of later stage acidic leach can not be asked for the true degree of porosity in this period with normal compaction curve simultaneously, since the total porosity (φ of first phase acidic leach end, alkaline environment compaction loss of (apart from modern 32Ma-now) to now
The 2-4 crushing) can calculate, that is:
φ
The 2-4 crushing=φ
b-φ
Now-φ
Carbonate cementation+ φ
Quartz dissolution+ φ
The carbonate cementation dissolving
And first phase acidic leach end-quartz dissolution/carbonate cementation finishes the degree of porosity φ of (the modern 32Ma-of distance is apart from modern 24.6Ma) this stage compaction loss
The 2-3 crushingFinish to degree of porosity φ with carbonate cementation apart from modern 2Ma (apart from modern 24.6Ma-2Ma) compaction loss
The 3-4 crushing, the modern 2Ma of distance is the degree of porosity φ of compaction loss extremely now
The 4-5 crushing, can't accurately obtain, according to the ratio of these two stage hole compaction loss on the normal compaction curve to φ
The 2-5 crushingDistribute the φ that asks
The 2-3 crushing, φ
The 3-4 crushingAnd φ
The 4-5 crushingAnd then ask for φ
c, φ
d, φ
e:
φ
c=φ
b-φ
Carbonate cementation+ φ
Quartz dissolution-φ
The 2-3 crushing
φ
d=φ
b-φ
Carbonate cementation+ φ
Quartz dissolution-φ
The 2-3 crushing-φ
The 3-4 crushing
φ
e=φ
b-φ
Carbonate cementation+ φ
Quartz dissolution-φ
The 2-3 crushing-φ
The 3-4 crushing-φ
The 4-5 crushing=φ
Now
Certain well 3431.25m deposition initial stage degree of porosity is 49.1%, before the quartzy increasing of feldspar dissolving, is mainly normal compacting, and this moment, degree of porosity was the degree of porosity 32.6% (buried depth 1350m) on the corresponding normal compaction curve; In carbonate cementation after feldspar dissolving/quartz strengthens/quartz strengthens on (buried depth is 2520m) corresponding normally compaction curve degree of porosity (19.3%)+feldspar solution porosity (5.17%)-quartz add macroporsity (0.23%), be 24.24%; After carbonate cementation/quartz dissolution finishes; Because carbonate cementation has suppressed the carrying out of compaction; Each diagenetic stage compacting subtracts the hole amount and in the ratio that each compacting in period on the normal compacting plate subtracts the hole amount it is distributed; And the compacting of confirming each diagenesis period subtracts the hole correcting value, and always to subtract the hole amount be 3.56% in each compacting in period after the carbonate cementation, distributes in 2.8: 5: 0.5 ratio; The degree of porosity of (buried depth 2800m) is that carbonate cementation/quartz strengthened corresponding before degree of porosity (24.24%)-carbonate cementation degree of porosity (12.27%)-compaction loss degree of porosity (1.2%) after feldspar dissolving/quartz strengthened before the carbonate cements dissolving, is 10.77%; The degree of porosity of (buried depth 3360m) is carbonate cements dissolving degree of porosity (10.77%)+carbonate cements solution porosity (3.06%)-compaction loss degree of porosity (2.14%) before after the carbonate cements dissolving, is 11.69%; The degree of porosity of (buried depth 3431.25m) is carbonate cements dissolving degree of porosity (11.69%)-compaction loss degree of porosity (0.22%) afterwards now, is 11.47%.Recover the degree of porosity of each diagenesis when beginning (end) thus.
2. the hot compaction effect is proofreaied and correct
Certain well 3431.25m is (the modern 42.5Ma of distance before arriving the increasing of feldspar dissolving/quartz after the deposition; Buried depth 1350m) experienced on husky four inferior section deposition of inferior section-Sha three times period, the mean ground temperature gradient of experience is 4.3 ℃/100m, when buried depth is 1350m; With geothermal gradient be under the situation of 3.87 ℃/100m; Degree of porosity is with real about 3.5% (Fig. 6) of multiple pressure, and promptly this moment, real degree of porosity did, geothermal gradient is the 32.6%-3.5%=29.1% under the situation of 3.87 ℃/100m; In like manner, to carbonate cementation/quartz dissolution (apart from modern 32Ma, about buried depth 2520m); The mean ground temperature gradient of experience is 4.18 ℃/100m (one section mean ground temperature gradient that deposits period of the last inferior section-Sha of Sha Si); With compare under the 3.87 ℃/100m, the porosity value that needs calibration under the 2520m buried depth is 3% (Fig. 6), promptly this moment, true degree of porosity should be 24.24%-3%=21.24%; All the other each section mean ground temperature gradients are more or less the same with the 3.87 ℃/100m of mean ground temperature gradient that sets up normal compacting plate; Therefore, can ignore the influence of hot compaction effect, not carry out the hot compaction effect and proofread and correct.
The 6th step: set up earth history sandstone reservoir in period degree of porosity evolution curve
To sum up, finally recover each main diagenesis effect true degree of porosity in period (table 1), and set up earth history sandstone reservoir in period degree of porosity evolution curve (Fig. 7).
Each diagenesis reservoir porosity in period value restoration result of certain Jing3431.25mChu of table 1
| Time (apart from modern Ma) | Ancient buried depth (m) | Degree of porosity (%) |
| 44.5 | 0 | 49.1 |
| 42.5 | 1350 | 29.1 |
| 32 | 2520 | 21.24 |
| 24.6 | 2800 | 10.77 |
| 2 | 3360 | 11.69 |
| 0 | 3431.25 | 11.47 |
Claims (2)
1. earth history sandstone reservoir in period degree of porosity evolution restoration methods, concrete steps are following:
The first step: the corresponding ancient buried depth of reservoir when setting up sandstone reservoir diagenesis evolutionary series and confirming the diagenesis generation
Second step: set up normal compacting plate
The first, analyze deposit particle diameter, sorting and rigid particles content influence degree to compaction, confirm to influence the Dominated Factors of compaction; The second, from the sample of the existing actual measurement of study area rerum natura, select that to meet strata pressure be normal pressure, cement content less than 5%, secondary pore content is less than 1% sample, as the sample under the normal compacting condition; The 3rd, with the sample under the selected normal compacting condition, divide different Dominated Factors to carry out the degree of depth and degree of porosity match, set up degree of porosity evolution curve, as the normal compacting plate of study area reservoir; The 4th, in conjunction with this area geothermal gradient evolution history, confirm the mean ground temperature gradient that target zone develops and experiences to now, the normal compacting plate of foundation can be thought the normal compacting plate under this mean ground temperature gradient control;
The 3rd step: set up the functional relation between degree of porosity and the face rate
Determine in the actual measurement degree of porosity radius greater than the voids content of 0.25 μ m by means of pressing the mercury data; Ask under 200 times of mirrors human eye and can differentiate the photopic vision degree of porosity; Be called apparent degree of porosity, by casting body flake now, utilize its corresponding face rate of petrographic microscope and computer image analysis stroke analysis then; The face rate is carried out match with corresponding apparent degree of porosity, just can set up the functional relation between face rate and the apparent degree of porosity;
The 4th step: the sandstone reservoir porosity inversion under the constraint of diagenesis sequence is returned stripping
Being the basis with casting body flake pore character now, is constraint with the diagenesis evolution sequence, begins back stripping from the Final Issue diagenesis; Recover each phase diagenesis and begin preceding pore character, adopt the computer image analysis technology, each phase diagenesis of quantitative Analysis; Except the compaction; Reservoir face rate is influenced variable quantity, and based on the relation between face rate and the apparent porosity, the face rate in the casting body flake now is converted into corresponding apparent porosity; Recover that each diagenesis begins, the porosity when finishing, and then obtain the porosity under each ancient buried depth;
The 5th step: mechanical ramming effect and hot compaction effect are proofreaied and correct
Based on the diagenesis evolution sequence, before main cementation took place, sample was normal packing stage, and its compacting under each buried depth is decreased the hole amount and can be read based on the normal compacting plate with sample tool same characteristic features; And after beginning main glued period; Cementation has suppressed normally carrying out of compaction; The compacting in each period subtracts hole amount can be adopted compacting after main cementation begins always to subtract ratio that the hole amount subtracts the hole amount in each compacting in period on the normal compacting plate it is distributed and to confirm that the compacting in each diagenesis period subtracts the hole correcting value, the stripping porosity is returned in the inverting of step 4 gained carry out the mechanical ramming effect and proofread and correct; Then; Based on study area buried history and geothermal gradient evolution history; Confirm the mean ground temperature gradient and the ancient buried depth of each diagenesis experience in period, utilize ground temperature field and sandstone porosity graph of a relation, the stripping porosity is returned in the inverting of step 4 gained carry out hot compaction effect correction;
The 6th step: on the basis of above-mentioned steps, confirm each true degree of porosity of main diagenesis stage, set up earth history sandstone reservoir in period degree of porosity evolution curve.
2. earth history sandstone reservoir in period degree of porosity evolution restoration methods as claimed in claim 1; It is characterized in that: in the first step to casting body flake now observe, scanning electron microscope analysis and fluid inclusion analysis; Analyze in conjunction with the diagenesis environmental evolution; Set up sandstone reservoir diagenesis evolutionary series,, confirm the time that each diagenesis begins and finishes according to the diagenesis evolution sequence of setting up; With these times project to recover on the individual well buried history of sample spot the corresponding ancient buried depth of reservoir when obtaining diagenesis and taking place.
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