CN102748016B - 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 elements of sandstone porosity in period evolution restoration methods.
Background technology
Along with the demand that improves constantly and oil and gas reserves is increased of middle-shallow layer Songliao basin, exploration target turns to deep layer gradually, and China's Deep Oil And Gas Exploration resource potential is huge, and oil-gas exploration has obtained gratifying achievement.But Deep Oil And Gas Exploration enrichment discipline is extremely complicated, reservoir shows the complicated feature such as " neglect oil and neglect water ", " neglecting storage neglects dry ", cause Deep Oil And Gas Exploration to prospect that difficulty is large, risk is high, success rate is low.Mid-deep strata sandstone reservoir has experienced complicated diagenesis transformation in the process of burying, earth history reservoir porosity in period has also experienced complicated evolutionary process, and the complexity of the matching relationship of reservoir porosity Evolutionary History and primary rock producing hydrocarbon row hydrocarbon history is to cause mid-deep strata Hydrocarbon Enrichment Regularity complexity, the low major reason of exploration success rate.Chinese scholars is mainly utilized " strip is returned in inverting " principle at present, taking Sequence of Diagenesis Evolution as constraint, according to the area percentage of various authigenic minerals and dissolution pore, the impact of the various diagenesis of quantitative calculation and analysis on elements of sandstone porosity, finally recovers earth history elements of sandstone porosity in period and develops.But prior art is only considered the contribution amount of various diagenesis to reservoir porosity, still has following problem: the ancient buried depth when absolute time that 1) definite each diagenesis occurs and generation; 2) most scholars are simply equal to degree of porosity by face rate in casting body flake, and there is no people and carry out human eye and can distinguish the research of functional relation between the aobvious degree of porosity of photopic vision and face rate; 3) restoration result does not carry out compaction correction, but all degree of porosity of compaction loss are all summed up in the point that to the early diagenesis phase.Along with improving constantly of Songliao basin, more and more higher to the requirement of porosity evolution precision of prediction, art methods can not meet the demands, and needs more accurate earth history elements of sandstone porosity in the period evolution restoration methods of development.
Summary of the invention
The object of the invention is to solve 3 problems that exist in existing earth history elements of sandstone porosity in period evolution restoration methods, set up more accurate earth history elements of sandstone porosity in period evolution restoration methods.The method is taking earth history elements of sandstone porosity in period evolution restoration methods as target, employing thin slice is observed, scanning electron microscope analysis, graphical analysis, Fluid-inclusion analysis, degree of porosity test multiple technologies method, at deposition characteristics, on the basis of Sequence of Diagenesis Evolution research, emphasis solves the time of each diagenesis generation in existing earth history elements of sandstone porosity in period evolution restoration methods and determining of ancient buried depth, the key issue such as relation and compaction correction between degree of porosity and face rate, taking casting body flake now hole looks as basis, taking Sequence of Diagenesis Evolution as constraint, the impact of the various diagenesis of quantitative analysis on elements of sandstone porosity, recovering earth history elements of sandstone porosity in period develops,
Technical scheme of the present invention is: a kind of earth history elements of sandstone porosity in period evolution restoration methods, and concrete steps are as follows:
The first step: the corresponding ancient buried depth of reservoir while setting up Diagenesis of Sandstone Reservoirs evolutionary series and diagenesis generation
To casting body flake now observe, scanning electron microscope analysis and Fluid-inclusion analysis, analyze in conjunction with diagenesis environmental evolution, set up Diagenesis of Sandstone Reservoirs evolutionary series, according to the Sequence of Diagenesis Evolution of setting up, determine the time that each diagenesis starts and finishes, projected in the individual well buried history that will recover sample spot to the corresponding ancient buried depth of reservoir while obtaining diagenesis generation these times;
Second step: set up normal compaction plate
The first, analyze sediment grain size, sorting and the influence degree of rigid particles content to compaction, determine the Dominated Factors that affects compaction; The second, from the sample of the existing actual measurement physical property in study area, select and meet the sample that stratum normal pressure, cement content are less than 5%, secondary pore content is less than 1%, as the sample under normal compaction condition; The 3rd, by the sample under selected normal compaction condition, point different Dominated Factors are carried out the degree of depth and degree of porosity matching, set up porosity evolution curve, can be used as study area reservoir normal compaction plate; The 4th, in conjunction with this area geothermal gradient Evolutionary History, determine target zone develop to now experience Average geothermal gradient, the normal compaction plate of foundation can be thought the normal compaction plate under this Average geothermal gradient control;
The 3rd step: set up the functional relation between degree of porosity and face rate
According to physics principle, the distinguishable photopic vision of human eye is about 0.1mm apart from the minimum air line distance of locating, therefore, when the air line distance of 0.5 μ m is amplified 200 times under the microscope, can be differentiated photopic vision by human eye, the pore radius that under 200 times of mirrors, human eye can be differentiated photopic vision is 0.25 μ m, based on above-mentioned situation, the hole that pore radius under 200 times of mirrors is less than to 0.25 μ m is considered as micropore, in the time of being related to of statistics face rate and degree of porosity, does not consider; Determine by means of pressing mercury data the voids content that radius in actual measurement degree of porosity is greater than 0.25 μ m, just human eye under 200 times of mirrors can be asked for and photopic vision degree of porosity can be differentiated, be called aobvious degree of porosity, then by casting body flake now, utilize petrographic microscope and Computer imaging analysis system to add up its corresponding face rate, face rate is carried out to matching with corresponding aobvious degree of porosity, just can set up the functional relation between face rate and aobvious degree of porosity;
The 4th step: stripping is returned in the elements of sandstone porosity inverting under Diagenetic Sequence constraint
Taking casting body flake pore character now as basis, taking Sequence of Diagenesis Evolution as constraint, start back stripping from Final Issue diagenesis, recover each phase diagenesis and start front pore character, adopt Computer imaging analysis system, quantitatively calculate each phase diagenesis, except compaction, reservoir face rate is affected to variable quantity, and according to the relation between face rate and aobvious degree of porosity, face rate in casting body flake is now converted into corresponding aobvious degree of porosity, the degree of porosity when recovering each diagenesis and starting, finish, and then obtain the degree of porosity under each ancient buried depth;
The 5th step: Compaction and hot compaction effect are proofreaied and correct
According to Sequence of Diagenesis Evolution, before main cementation occurs, sample is the normal compaction stage, and hole amount is damaged in its compacting under each buried depth can be according to reading with the normal compaction plate of sample tool same characteristic features; And after starting main cementing period, cementation has suppressed normally carrying out of compaction, the compacting in each period subtracts hole amount and can adopt compacting after main cementation starts always to subtract ratio that hole amount subtracts hole amount in each compacting in period on normal compaction plate it to be distributed and determine that the compacting in each diagenesis period subtracts hole correcting value, and the inverting of step 4 gained is returned to stripping degree of porosity carries out Compaction correction; Then, according to study area buried history and geothermal gradient Evolutionary History, Average geothermal gradient and the ancient buried depth of determining each diagenesis experience in period, utilize Temperature Field and sandstone porosity graph of a relation, the inverting of step 4 gained returned to stripping degree of porosity and carry out hot compaction effect correction;
The 6th step: on the basis of above-mentioned steps, determine each true degree of porosity of main diagenesis stage, set up earth history elements of sandstone porosity in period evolution curve.
Beneficial effect of the present invention is: the present invention is on the basis of deposition characteristics, Sequence of Diagenesis Evolution research, taking casting body flake now hole looks as basis, taking Sequence of Diagenesis Evolution as constraint, quantitative analysis the impacts of various diagenesis on elements of sandstone porosity, recovered accurately earth history elements of sandstone porosity in period develop.Emphasis has solved that time and the ancient buried depth that in existing earth history elements of sandstone porosity in period evolution restoration methods, each diagenesis occurs determined, the key issue such as relation and compaction correction between degree of porosity and face rate, improve the precision of earth history sandstone reservoir in period hole evolution restoration methods, effectively predicting oil/gas becomes the degree of porosity of Tibetan sandstone reservoir in period, thereby provides guidance for effective reservoir evaluation.
Brief description of the drawings
Fig. 1 is the individual well buried history of recovering sample spot.
Fig. 2 is reservoir normal compaction plate under the different sortings of Shengli Oil Field somewhere Paleogene Sandstones.
Fig. 3 is the functional relation between Shengli Oil Field somewhere face rate and aobvious degree of porosity.
Fig. 4 is the physical property 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 schematic diagram.
Fig. 6 is the degree of porosity graph of a relation of Temperature Field and sandstone.
Fig. 7 is certain well 3431.25m earth history reservoir porosity in period evolution curve.
Detailed description of the invention
The concrete technical scheme of this invention is described with Shengli Oil Field somewhere earth history elements of sandstone porosity in period evolution restoration methods:
The first step: the corresponding ancient buried depth of reservoir while setting up Diagenesis of Sandstone Reservoirs evolutionary series and diagenesis generation
Utilize the technology such as thin slice observation, scanning electron microscope analysis and Fluid-inclusion analysis, analyze in conjunction with diagenesis environmental evolution, think that the husky four sections of Sequence of Diagenesis Evolutions in Shengli Oil Field somewhere are: apart from modern 44.5Ma-apart from modern 42.5Ma, diagenesis is taking compaction as main; Apart from modern 42.5Ma-apart from modern 32Ma, compaction/feldspar dissolving/quartz secondary; Apart from modern 32Ma-apart from modern 24.6Ma, compaction/quartz dissolution/carbonate cementation; Apart from modern 24.6Ma-apart from modern 2Ma, compaction/carbonate cements is dissolved; Apart from modern 2Ma-now, compaction/late period pyrite.
According to the Sequence of Diagenesis Evolution of above-mentioned foundation, determine the time that each diagenesis starts and finishes, these times are projected in the individual well buried history (Fig. 1) that will recover sample spot, can obtain the ancient buried depth that each phase diagenesis starts and finishes.Taking certain well 3431.25m as example, before modern about 45Ma, start deposition, 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 compaction plate
The first, analyze the influence degree to compaction such as Shengli Oil Field somewhere sediment grain size, sorting and rigid particles content, think that affecting the Dominated Factors of compaction is deposit sorting coefficient; The second, from the sample of the existing actual measurement physical property in study area, select and meet that stratum normal pressure, cement content are less than 5%, the poor sample of secondary pore is less than 1%, as the sample under normal compaction condition; The 3rd, by the sample under selected normal compaction condition, divide different Dominated Factors to carry out the degree of depth and degree of porosity matching, set up sorting coefficient and be 1.5-1.75,1.75-2,2-2.5 and be greater than the porosity evolution curve under 2.5 various sortings, as study area reservoir normal compaction plate (Fig. 2); The 4th, in conjunction with this area geothermal gradient Evolutionary History, determine that it is 3.87 DEG C/100m that target zone develops to the Average geothermal gradient experiencing now.The normal compaction plate of setting up can be thought the normal compaction plate under 3.87 DEG C/100m of this Average geothermal gradient control.
The 3rd step: set up the functional relation between degree of porosity and face rate
Utilize a large amount of sample actual measurement degree of porosity, can differentiate the aobvious degree of porosity content of photopic vision in conjunction with pressing human eye in mercury analysis actual measurement degree of porosity, ask for aobvious degree of porosity, then will show degree of porosity and carry out Function Fitting with corresponding casting body flake effective surface porosity, set up the functional relation (Fig. 3) between face rate and aobvious degree of porosity.
The 4th step: stripping is returned in the elements of sandstone porosity inverting under Diagenetic Sequence constraint
As an example of certain well 3431.25m example, (sorting coefficient 1.59), chooses the typical ken, carry out 3 row × 3 row the photo of totally 9 kens splice that (a), survey now degree of porosity is 11.7% to Fig. 4; Carbonate cements is dissolved the face rate (being converted into degree of porosity is 3.06%) that produces 1.26%; 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%), quartz secondary loss face rate 0.06% (0.23%); Feldspar and landwaste dissolve the face rate (being converted into degree of porosity is 5.17%) that produces 2.34%, and each diagenesis face in period rate feature is shown in Fig. 4 b to 4-14g.
The 5th step: Compaction and hot compaction effect are proofreaied and correct
1. Compaction is proofreaied and correct
Describe as an example of Shengli Oil Field somewhere example, suppose that it is φ that (the modern 42.5Ma of distance) degree of porosity before stripping feldspar dissolving/quartz secondary is returned in inverting
11, now the degree of porosity in normal compaction situation is φ
1, now true degree of porosity is φ
a, this one-phase compaction loss degree of porosity is φ
1 crushing; When the first phase, acidic leach finished, to return stripping degree of porosity be φ in (apart from modern 32Ma) inverting
21, corresponding normal compaction degree of porosity is φ
2, this one-phase compaction loss degree of porosity is φ
2 crushings, now true degree of porosity is φ
b; The degree of porosity that after carbonate cementation and before second phase acidic leach, (apart from modern 24.6Ma) returns stripping recovery by inverting is φ
31, in corresponding same depth normal compaction situation, degree of porosity is φ
3, this one-phase compaction loss degree of porosity is φ
3 crushings, now true degree of porosity is φ
c, second phase acidic leach finishes (apart from modern 2Ma), and to return by inverting the degree of porosity that stripping recovers be φ
41, in corresponding same depth normal compaction situation, degree of porosity is φ
4, this one-phase compaction loss degree of porosity is φ
4 crushings, now true degree of porosity is φ
d, the modern 2Ma of distance so far compaction loss degree of porosity is φ
5 crushings, corresponding true degree of porosity φ
e, i.e. φ
e=φ
now(Fig. 5).
From the above, returning due to inverting degree of porosity that strip draws is not consider to draw in the situation of compaction loss, and now real degree of porosity is greater than this value, i.e. φ
1> φ
11, cementing owing to not experiencing this period, be the normal compaction stage substantially.Therefore, can think φ
a=φ
1, and experienced after first phase acidic leach the true degree of porosity φ of (feldspar dissolves, quartz secondary)
bshould be normal compaction degree of porosity φ in this period
2add feldspar solution porosity in this in period, deduct quartz secondary loss degree of porosity, this one-phase substantially also can be regarded as normal compaction.Experience after alkaline environment, the cementing of carbonate occurred, the dissolving of a small amount of quartz, because the general content of carbonate cements is higher, mostly can suppress the carrying out of normal compaction this period, can not utilize normal compaction curve to ask for the true degree of porosity in this period.Simultaneously this one-phase of later stage acidic leach can not be asked for normal compaction curve the true degree of porosity in this period, since first phase acidic leach finish, the total porosity (φ of alkaline environment compaction loss of (apart from modern 32Ma-now) to now
2-4 crushing) can calculate, that is:
φ
2-4 crushing=φ
b-φ
now-φ
carbonate cementation+ φ
quartz dissolution+ φ
carbonate cementation is dissolved
And finish-quartz dissolution/carbonate cementation of first phase acidic leach finishes the degree of porosity φ of (apart from modern 32Ma-apart from modern 24.6Ma) this one-phase compaction loss
2-3 crushingfinish to the degree of porosity φ apart from modern 2Ma (apart from modern 24.6Ma-2Ma) compaction loss with carbonate cementation
3-4 crushing, apart from the modern 2Ma degree of porosity φ of compaction loss extremely now
4-5 crushing, cannot accurately obtain, according to the ratio of these two stage hole compaction loss on normal compaction curve to φ
2-5 crushingdistribute the φ asking
2-3 crushing, φ
3-4 crushingand φ
4-5 crushingand then ask for φ
c, φ
d, φ
e:
φ
c=φ
b-φ
carbonate cementation+ φ
quartz dissolution-φ
2-3 crushing
φ
d=φ
b-φ
carbonate cementation+ φ
quartz dissolution-φ
2-3 crushing-φ
3-4 crushing
φ
e=φ
b-φ
carbonate cementation+ φ
quartz dissolution-φ
2-3 crushing-φ
3-4 crushing-φ
4-5 crushing=φ
now
Certain well 3431.25m deposition Initial Crack degree is 49.1%, and feldspar is mainly normal compaction before dissolving quartz secondary, and now degree of porosity is the degree of porosity 32.6% (buried depth 1350m) on corresponding normal compaction curve; Degree of porosity (19.3%)+feldspar solution porosity (5.17%)-quartz secondary degree of porosity (0.23%) on (buried depth is 2520m) corresponding normal compaction curve in carbonate cementation/quartz secondary, is 24.24% after feldspar dissolving/quartz secondary; After carbonate cementation/quartz dissolution finishes, because carbonate cementation has suppressed the carrying out of compaction, each diagenetic stage compacting subtracts the ratio that hole amount subtracts hole amount in each compacting in period on normal compaction plate it is distributed, and the compacting of determining each diagenesis period subtracts hole correcting value, it is 3.56% that carbonate cementation each compacting in period afterwards always subtracts hole amount, distributes in the ratio of 2.8: 5: 0.5; Before carbonate cements dissolving, the degree of porosity of (buried depth 2800m) is feldspar dissolving/quartz secondary carbonate cementation/quartz secondary degree of porosity (24.24%)-carbonate cementation degree of porosity (12.27%)-compaction loss degree of porosity (1.2%) of correspondence before afterwards, is 10.77%; After carbonate cements dissolving, the degree of porosity of (buried depth 3360m) is degree of porosity (10.77%)+carbonate cements solution porosity (3.06%)-compaction loss degree of porosity (2.14%) before carbonate cements is dissolved, and is 11.69%; The degree of porosity of (buried depth 3431.25m) is degree of porosity (11.69%)-compaction loss degree of porosity (0.22%) after carbonate cements is dissolved now, is 11.47%.Degree of porosity when recovering thus each diagenesis and starting (end).
2. hot compaction effect is proofreaied and correct
Certain well 3431.25m is (the modern 42.5Ma of distance before deposition arrives feldspar dissolving/quartz secondary afterwards, buried depth 1350m) experience on husky four sub-section of sub-section-Sha tri-times deposition period, the Average geothermal gradient of experience is 4.3 DEG C/100m, in the time that buried depth is 1350m, with geothermal gradient be in the situation of 3.87 DEG C/100m, degree of porosity is by real 3.5% left and right of multiple pressure (Fig. 6), now real degree of porosity is, geothermal gradient is the 32.6%-3.5%=29.1% in the situation of 3.87 DEG C/100m, in like manner, to before carbonate cementation/quartz dissolution (apart from modern 32Ma, buried depth 2520m left and right), the Average geothermal gradient of experience is 4.18 DEG C/100m (mono-section of the upper sub-section-Sha of Sha Si deposits the Average geothermal gradient in period), compared with under 3.87 DEG C/100m, the porosity value that needs calibration under 2520m buried depth is 3% (Fig. 6), now true degree of porosity should be 24.24%-3%=21.24%, all the other each section of Average geothermal gradients are more or less the same with the 3.87 DEG C/100m of Average geothermal gradient that sets up normal compaction plate, therefore, can ignore the impact of hot compaction effect, do not carry out hot compaction effect correction.
The 6th step: set up earth history elements of sandstone porosity in period evolution curve
To sum up, finally recover each authigenetic clay rim true degree of porosity in period (table 1), and set up earth history elements of sandstone porosity in period evolution curve (Fig. 7).
The each diagenesis of certain Jing3431.25mChu of table 1 reservoir porosity in period value restoration result
| 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 (1)
1. earth history elements of sandstone porosity in a period evolution restoration methods, concrete steps are as follows:
The first step: the corresponding ancient buried depth of reservoir when setting up Diagenesis of Sandstone Reservoirs evolutionary series and definite diagenesis and occurring: to casting body flake now observe, scanning electron microscope analysis and Fluid-inclusion analysis, analyze in conjunction with diagenesis environmental evolution, set up Diagenesis of Sandstone Reservoirs evolutionary series, according to the Sequence of Diagenesis Evolution of setting up, determine the time that each diagenesis starts and finishes, projected in the individual well buried history that will recover sample spot to the corresponding ancient buried depth of reservoir while obtaining diagenesis generation these times;
Second step: set up normal compaction plate
The first, analyze sediment grain size, sorting and the influence degree of rigid particles content to compaction, determine the Dominated Factors that affects compaction; The second, from the sample of the existing actual measurement physical property in study area, select that to meet strata pressure be the sample that normal pressure, cement content are less than 5%, secondary pore content is less than 1%, as the sample under normal compaction condition; The 3rd, by the sample under selected normal compaction condition, point different Dominated Factors are carried out the degree of depth and degree of porosity matching, set up porosity evolution curve, as study area reservoir normal compaction plate; The 4th, in conjunction with this area geothermal gradient Evolutionary History, determine target zone develop to now experience Average geothermal gradient, the normal compaction plate of foundation can be thought the normal compaction plate under this Average geothermal gradient control;
The 3rd step: set up the functional relation between degree of porosity and face rate
Determine by means of pressing mercury data the voids content that radius in actual measurement degree of porosity is greater than 0.25 μ m, ask for human eye under 200 times of mirrors and can differentiate photopic vision degree of porosity, be called aobvious degree of porosity, then by casting body flake now, utilize petrographic microscope and Computer imaging analysis system to add up its corresponding face rate, face rate is carried out to matching with corresponding aobvious degree of porosity, just can set up the functional relation between face rate and aobvious degree of porosity;
The 4th step: stripping is returned in the elements of sandstone porosity inverting under Diagenetic Sequence constraint
Taking casting body flake pore character now as basis, taking Sequence of Diagenesis Evolution as constraint, start back stripping from Final Issue diagenesis, recover each phase diagenesis and start front pore character, adopt Computer imaging analysis system, quantitatively calculate each phase diagenesis, except compaction, reservoir face rate is affected to variable quantity, and according to the relation between face rate and aobvious degree of porosity, face rate in casting body flake is now converted into corresponding aobvious degree of porosity, the degree of porosity when recovering each diagenesis and starting, finish, and then obtain the degree of porosity under each ancient buried depth;
The 5th step: Compaction and hot compaction effect are proofreaied and correct
According to Sequence of Diagenesis Evolution, before main cementation occurs, sample is the normal compaction stage, and hole amount is damaged in its compacting under each buried depth can be according to reading with the normal compaction plate of sample tool same characteristic features; And after starting main cementing period, cementation has suppressed normally carrying out of compaction, the compacting in each period subtracts hole amount and can adopt compacting after main cementation starts always to subtract ratio that hole amount subtracts hole amount in each compacting in period on normal compaction plate it to be distributed and determine that the compacting in each diagenesis period subtracts hole correcting value, and the inverting of step 4 gained is returned to stripping degree of porosity carries out Compaction correction; Then, according to study area buried history and geothermal gradient Evolutionary History, Average geothermal gradient and the ancient buried depth of determining each diagenesis experience in period, utilize Temperature Field and sandstone porosity graph of a relation, the inverting of step 4 gained returned to stripping degree of porosity and carry out hot compaction effect correction;
The 6th step: on the basis of above-mentioned steps, determine each true degree of porosity of main diagenesis stage, set up earth history elements of sandstone porosity in period evolution curve.
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