CN105974092A - Method for full-dimension representation and analysis of dense reservoir pore throats - Google Patents
Method for full-dimension representation and analysis of dense reservoir pore throats Download PDFInfo
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Abstract
The invention discloses a method for full-dimension representation and analysis of dense reservoir pore throats. The method comprises the following steps of 1, data optimization: (a) preparing a dense oil rock sample; (b) using a high-pressure mercury injection apparatus Pore Master to perform mercury injection experiment on a rock sample; (c) using an automatic isothermal adsorption instrument to perform low-temperature nitrogen experiment at the temperature of 77.35K and relative pressure of 0.01-1MPa; (d) according to adsorption type pore throat distribution frequency, accumulating a distribution frequency chart, and performing interpolating on the accumulated distribution frequency chart; (e) connecting the mercury injection type pore throat distribution frequency and the converted adsorption type pore throat distribution frequency at 25nm; 2, data check. The representation method has the advantages that the steps are simple; the pore throat distribution rules of different reservoirs can be analyzed, and the more accurate and deeper evaluation is performed on different dimensions of space microstructures by crossing multiple orders of magnitude.
Description
Technical field
The invention belongs to fine and close oil exploration field, be specifically related to a kind of compact reservoir pore throat full size and characterize and analysis method.
Background technology
Affected with exploitation by North America densification oil successful exploration, the whole world fine and close oil fast development, China, Russia, etc. more than 10 states actively launch correlational study.The fine and close oil of China is widely distributed, and technically recoverable resources reaches 20 × 108~25×108T, its effective exploitation is most important to Energy Development in China.Grand celebration, long celebrating, Sichuan and huge port are the big fine and close oil producing regions of China the most typical four.One of marked feature of fine and close oil is the finest and close for reservoir, extensive development micron-nanometer level pore throat, and based on nanoscale pore throat.Therefore, fine sign compact reservoir micro/nano-scale pore throat system is the primary premise of this petroleum industry of effective exploitation " dark fund ".Owing to compact reservoir pore throat crosses over multiple orders of magnitude, radius as little as about 1nm, current research, in addition to by tradition pore throat measuring technology, also introduces such as high-pressure mercury, gas absorption, FIB-SEM, nanometer CT equally accurate and the higher technology of resolution.
High-pressure mercury technology belongs to the popularization of conventional pressure hydrargyrum technology, will enter mercury pressure and rise to 60000psi(413.8MPa on the basis of routine pressure hydrargyrum technology), pore throat radius test range expansion is to 1.8nm-500 μm.Tian Hua etc. (2012) utilize high-pressure mercury technology bound gas adsorption technology to attempt obtaining the full size distribution of fine and close rock sample aperture, but its full size collection of illustrative plates belongs to the simple concatenation of different experiments method, and the jumping characteristic of curve is big, the effectiveness after data fusion is also without strict checking.High-pressure mercury is combined by Huang Zhenkai etc. (2013) with gas absorption, fine and close blue sheep interior microscopic hole has been carried out qualitative and quantitative study, but the relative amount of different size hole is had in his research, do not provide the concrete distribution characteristics of single voids content.Although high-pressure mercury method can obtain the substantially distribution situation of pore communication and different scale hole, but it is high to enter mercury pressure, reaching more than 400MPa, relevant scholar thinks that it easily causes artificial crack, and the test for micro-pore still exists bigger error.Therefore, this technology the most also needs to further investigate further.
Gas absorption, common technology is low temperature nitrogen absorption, and test pore radius is between 1nm-50nm.Hole is divided into 3 classes by pore radius size by IUPAC (IUPAC): micropore (<1nm), mesoporous (1 ~ 25nm), grand hole (>25nm).Under low-temp low-pressure, the isothermal adsorption of N2 is possible not only to effectively reflect rock sample micropore and mesoporous pore-size distribution, and can calculate specific surface area by BET equation, can be distributed with calculated pore by BJH equation, by isothermal adsorption and the measurable pore shape of desorption curve.Low temperature nitrogen absorption method is used for compact reservoir pore configuration research by the most numerous scholars, but the pore-size distribution jumping characteristic that nitrogen adsorption obtains is big, real effectively in the range of mesoporous interval, need to be combined this research method with additive method could embody reservoir micropore structure feature comprehensively.
FIB-SEM and nanometer CT, in current research, are mainly used in two dimension fine description and three-dimensionalreconstruction digital cores, are different from the quantitative assessment of high-pressure mercury and gas-adsorption technique.The regularity of distribution for overall evaluation micro throat, Philip H. Nelson(2009) use optical microscope, scanning electron microscope, pressure hydrargyrum, low-angle neutron scattering and calculate the methods such as chemistry, have studied oil, water, alkane and clay mineral molecular size, compact reservoir Pore throat size, institute's Research scale crosses over 7 orders of magnitude, obtains famous " Nelson plate ".Thereafter, Zou Caineng etc. (2012) obtain (2013) such as the whole world typical case " the Nelson plate " of unconventionaloil pool reservoir nanoscale throat distribution, Yang Hua and obtain " the Nelson plate " of Ordos Basin prolongation group densification oil reservoir throat distribution.But this achievement in research can only provide certain oil district reservoir rock sample pore throat substantially distribution, it is impossible to quantifies Pore throat size and the regularity of distribution of content thereof.
For quantitatively characterizing compact reservoir pore throat overall distribution rule, full size distribution in aperture is defined by the present invention, and deeply contrast high-pressure mercury and low temperature nitrogen adsorption experiment data, syncaryon magnetic resonance and centrefuge experiment, preferably valid data, set up compact reservoir pore throat full size distribution characterizing method.
Summary of the invention
The present invention proposes a kind of compact reservoir pore throat full size and characterizes and analysis method, and the method can analyze different reservoir throat distribution rule, preferably instructs fine and close oil effective exploitation, reduces development cost, improve development efficiency.
The technical scheme is that and be achieved in that: a kind of compact reservoir pore throat full size characterizes and the method for analysis, comprise the steps: one, data preferred:
A () prepares fine and close oil rock sample, test rock sample quality by balance, by slide gauge test rock sample length and diameter, and calculates rock sample volume, calculates rock sample density by quality and volume, oozes instrument test rock sample porosity by hole；
B () uses high-pressure mercury instrument Pore Master to carry out rock sample pressing hydrargyrum experiment, and by the percentage composition of total void volume shared by rock sample density, quality, porosity calculation difference pore throat interval volume, i.e. mercury injection method pore throat distribution frequency；
C () uses automatic isothermal adsorption instrument, it is 77.35K in temperature, low temperature nitrogen adsorption experiment is carried out, by the percentage composition of total pore size volume shared by rock sample density, quality, porosity calculation difference pore throat interval volume, i.e. absorption method throat distribution frequency between relative pressure 0.01-1MPa；
D () obtains absorption method pore throat cumulative distribution frequency diagram according to absorption method throat distribution frequency, and at the enterprising row interpolation of cumulative distribution frequency diagram, interpolation method selects point-to-point transmission linear interpolation or polynomial interopolation, interpolation point selects the point of mercury injection method pore throat cumulative distribution below frequency diagram 100nm, cumulative distribution frequency after interpolation is transformed into throat distribution frequency, and making absorption method throat distribution frequency translation after converting is revised throat distribution frequency；
The revised throat distribution frequency data of (e) mesoporous interval employing, and between grand porose area, use mercury injection method pore throat distribution frequency data, two kinds of data carry out interpolation at the separation 25nm in mesoporous and grand hole and are connected, and are converted into cumulative distribution frequency diagram, i.e. comprehensive throat distribution frequency；
Two, data detection:
F () makes parallel rock sample, and to rock sample saturation water, carry out 0.14MPa, 0.28MPa, 1.38MPa and 2.76MPa centrifugal force the most successively, and front and back carry out NMR test the most centrifugal, by asking for the ratio of the semaphore after being centrifuged and the semaphore of saturated-water phase, the voids content of below below below below 1 μm, 0.5 μm, 0.1 μm, 0.05 μm can be obtained, such that it is able to draw NMR-to be centrifuged voids content cumulative distribution table；
G the comprehensive throat distribution frequency translation preferably gone out is comprehensive pore throat cumulative distribution frequency by (), and be centrifuged data with parallel rock sample NMR-and be plotted in same cumulative distribution table, sees whether that surmounting NMR-is centrifuged the point of cumulative distribution；Such as, Fig. 5 is centrifuged data with NMR-at 100nm point first and overlaps, illustrate that the data preferably gone out are higher in the cumulative amount of below 100nm, the most total cumulative amount is 102%, more than 100%, illustrate that below 100nm hole cumulative amount is inevitable higher, need to be modified.
H data are modified by (), correction step is: the following voids content of (1) pair radius 2nm retrains, owing to below 2nm hole great majority are invalid hole, the content of less hole can be arranged to 0 when retraining, cumulative distribution is controlled in the range of fair-sized；(2) if still deviation theory relation when following for radius 2nm content is tied to ultimate value 0, then check that abnormity point place is interval, row constraint of going forward side by side；As in Fig. 5,100nm point still surmounts NMR-centered plots, then need 50nm-100nm section is tested, find the abnormity point in this interval, suitably retrain；If deviation theory relation at 500nm, then check that 100nm-500nm is interval, by that analogy, checks one by one and revises.
(i) revised comprehensive pore throat cumulative distribution frequency is again converted to comprehensive throat distribution frequency and i.e. obtains pore throat full size distribution characteristics collection of illustrative plates；
(j) analysis to full size distribution characteristics collection of illustrative plates: the contribution plot of rock sample permeability is plotted in revised comprehensive throat distribution frequency, such as the increase with permeability, on the right side of different lithology densification rock sample pore-size distribution, crest is raised or is moved to right, illustrate that the contribution of permeability is affected substantially by macrovoid, as permeability contribution rate curve main peak is gradually deviated from throat distribution curve main peak, penetrating power is made to rely primarily on the contribution of a small amount of macrovoid, part is from nanoscale hole, this situation can make the reservoir exploitation difficulty will be very big, and substrate fluid is extremely difficult to be employed.
Beneficial effects of the present invention is as follows: this characterizing method step is simple, different reservoir throat distribution rule can be analyzed by the method, cross over multiple order of magnitude and the space microstructure of reservoir different scale is carried out the most deep evaluation, preferably instruct fine and close oil effective exploitation, reduce development cost, improve development efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 for being transformed into revised distribution frequency figure by absorption method cumulative frequency；
Fig. 2 is the coordinate diagram carrying out interpolation connection at 25nm；
Fig. 3 is centrifugal distribution and actual distribution theory relation schematic diagram；
Fig. 4 is the centrifugal accumulation of the NMR-before revising and comprehensive pore throat cumulative distribution frequency diagram；
Fig. 5 is the centrifugal accumulation of revised NMR-and comprehensive pore throat cumulative distribution frequency diagram；
Fig. 6 is the different permeability rank tight sand permeability contribution rate of long celebrating and pore throat full size distribution characteristics atlas analysis figure.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
The technical scheme is that and be achieved in that:
A kind of compact reservoir pore throat full size characterizes and the method for analysis, comprise the steps: one, data preferred:
A () prepares fine and close oil rock sample, test rock sample quality by balance, by slide gauge test rock sample length and diameter, and calculates rock sample volume, calculates rock sample density by quality and volume, oozes instrument test rock sample porosity by hole；
B () uses high-pressure mercury instrument Pore Master to carry out rock sample pressing hydrargyrum experiment, and by the percentage composition of total void volume shared by rock sample density, quality, porosity calculation difference pore throat interval volume, i.e. mercury injection method pore throat distribution frequency；
C () uses automatic isothermal adsorption instrument, it is 77.35K in temperature, low temperature nitrogen adsorption experiment is carried out, by the percentage composition of total pore size volume shared by rock sample density, quality, porosity calculation difference pore throat interval volume, i.e. absorption method throat distribution frequency between relative pressure 0.01-1MPa；
Mercury injection method and absorption method evaluation are the interval volume sizes of different pore throat, can calculate the percentage composition (distribution frequency, shown in Fig. 1 left side) of total pore size volume shared by the volume of different pore throat intervals by parameters such as rock sample density, quality, porositys.The reason that absorption method data jumping characteristic is big be exactly its test point very little, cause single pore throat interval to widen, volume content change is acutely.And the measuring point of mercury injection method is intensive, one group of data is more than 80 measuring points, the most single pore throat interval is the narrowest, interval two ends Pore throat size difference is the least, according to differential thought, interval pore volume content can be equivalent to the pore volume content of a certain size pore throat, the pressure hydrargyrum throat distribution relative smooth that therefore Fig. 1 obtains, meet conventional understanding.
For the feature that low temperature nitrogen adsorpting data jumping characteristic is bigger, can be at its enterprising row interpolation of cumulative distribution frequency diagram, after the cumulative distribution frequency after interpolation is transformed into throat distribution frequency, jumping characteristic substantially weakens (as shown in Fig. 1 right side).Interpolation method is as shown in step d:
nullD () obtains absorption method pore throat cumulative distribution frequency diagram according to absorption method throat distribution frequency，And at the enterprising row interpolation of cumulative distribution frequency diagram，Interpolation method selects point-to-point transmission linear interpolation or polynomial interopolation，Because the 100nm data below point that absorption method selects，But the data point that absorption method obtains is fewer，Make data jumping characteristic big，To such an extent as to error is bigger，If error to be reduced，The data point that pressure hydrargyrum obtains can be inserted adsorption number strong point by interpolation algorithm，Absorption method data point is made to become close，Solve the error problem of absorption method，So interpolation point selects the pore throat point of mercury injection method pore throat cumulative distribution frequency diagram (being converted to by mercury injection method pore throat distribution frequency) below 100nm (because of the point contained in mercury injection method data，Illustrate to exist the pore throat of corresponding size inside actual rock sample，What simply its volume content and absorption test obtained has difference)，Cumulative distribution frequency after interpolation is transformed into throat distribution frequency，Making absorption method throat distribution frequency translation after converting is revised throat distribution frequency；
Obtain due to absorption method and mercury injection method is all pore throat volume content, it is assumed that in test process, pore throat is not destroyed, then same the slightly larger person of volume content, it is believed that measuring accuracy is higher.Because the volume content that test obtains is often slightly smaller than true volume content, only constantly close to actual value, precision just improves constantly.By by revised throat distribution frequency and mercury injection method pore throat distribution frequency Data Comparison, equally find, revised throat distribution frequency distribution is apparently higher than mercury injection method pore throat distribution frequency data, but close to (hole is divided into 3 classes by pore radius size by IUPAC (IUPAC): micropore (<1nm), mesoporous (1 ~ 25nm), grand hole (>25nm) when of 25nm), data trend changes, revised throat distribution frequency drops to below mercury injection method pore throat distribution frequency data, so needing to use e to walk:
E () is at the revised throat distribution frequency data of mesoporous interval employing, and between grand porose area, use mercury injection method pore throat distribution frequency data, two kinds of data carry out interpolation at the separation 25nm in mesoporous and grand hole and are connected that (Fig. 2 just can illustrate the interpolation method at 25nm, the data between two peak values before and after sample point selection closes on 25nm during interpolation, then 25nm size pore throat is carried out linear or polynomial interopolation, after interpolation obtains the content of 25nm size pore throat, it is attached mesoporous with grand hole), i.e. can get comprehensive throat distribution frequency, as shown in Figure 2；
The data reasonability preferably gone out need to be checked further, main reason is that two aspects: (1) high-pressure mercury ruptures micro-pore and causes large hole gap volume content higher, shows as cumulative distribution often beyond 100%；(2) low temperature nitrogen absorption test is mainly for the above hole of radius 1nm, the hole that the adsorbance of below 1nm can be attached between 1-2nm when processing by instrumentation program, showing as mesoporous distribution jumping characteristic big, after being combined with mercury pressuring data, cumulative distribution is likely to occur the situation more than 100%.
Whether the focusing on of inspection examines single voids content and cumulative distribution beyond normal value, and is modified.Check that whether single hole is beyond normal value, it is impossible to realize；Only check whether cumulative distribution exceedes normal value, it is easy to accomplish, but problematic data point cannot be found.Set forth herein that employing nuclear magnetic resonance, NMR combines centrifugal test (i.e. NMR test) and tests the data preferably gone out.
The step of data detection is:
F () makes parallel rock sample, and rock sample saturation water (is made parallel rock sample and refers to that making crucial physical property (includes lithology, porosity, permeability, the degree of depth, oil district etc.) rock sample identical with step a), carry out 0.14MPa the most successively, 0.28MPa, 1.38MPa and 2.76MPa centrifugal force, and front and back carry out NMR test the most centrifugal, by asking for the ratio of the semaphore after being centrifuged and the semaphore of saturated-water phase, below 1 μm can be obtained, below 0.5 μm, below 0.1 μm, voids content below 0.05 μm, such that it is able to draw NMR-to be centrifuged voids content cumulative distribution table；Owing to the existence of irreducible water makes corresponding semaphore bigger than normal, cause the cumulative amount of same point than cumulative actual content higher (Fig. 3, cumulative actual content is theoretic content, it is an imaginary curve), but it is as the aperture big this difference of change to be gradually reduced, final two curves tend to overlapping at cumulative amount 100%, just because of NMR-is centrifuged hole content distribution and there is above-mentioned theory relation with actual distribution, just achieve and the data preferably gone out are carried out on cumulative distribution table segmentation inspection.
G the comprehensive throat distribution frequency translation preferably gone out is comprehensive pore throat cumulative distribution frequency by (), and be centrifuged data with parallel rock sample NMR-and be plotted in same cumulative distribution table, sees whether that surmounting NMR-is centrifuged the point of cumulative distribution；Such as, Fig. 4 is centrifuged data with NMR-at 100nm point first and overlaps, illustrate that the data preferably gone out are higher in the cumulative amount of below 100nm, the most total cumulative amount is 102%, more than 100%, illustrate that below 100nm hole cumulative amount is inevitable higher, need to be modified.
H data are modified by (), correction step is: the following voids content of (1) pair radius 2nm retrains, owing to below 2nm hole great majority are invalid hole, the content of less hole can be arranged to 0 when retraining, cumulative distribution is controlled in the range of fair-sized (i.e. the theoretical value 100% of cumulative distribution, if it exceeds partial invalidity data point will suitably be retrained by 100%)；(2) if when following for radius 2nm content is tied to ultimate value 0 still deviation theory relation (theory relation refers to that 1. cumulative distribution frequency should be 100%, or infinite approach 100%；2. comprehensive pore throat cumulative distribution frequency should be in below NMR-centered plots, it is impossible to has data point to cross NMR-centered plots), then check that abnormity point place is interval, row constraint of going forward side by side；As in Fig. 5,100nm point still surmounts NMR-centered plots, then need 50nm-100nm section is tested, find the abnormity point in this interval, suitably retrain；If deviation theory relation at 500nm, then checking that 100nm-500nm is interval, by that analogy, checks one by one and revises, revised structure is as shown in Figure 5.
(i) revised comprehensive pore throat cumulative distribution frequency is again converted to comprehensive throat distribution frequency and i.e. obtains pore throat full size distribution characteristics collection of illustrative plates；
(j) analysis to full size distribution characteristics collection of illustrative plates: the contribution plot of rock sample permeability is plotted in revised comprehensive throat distribution frequency, such as the increase with permeability, on the right side of different lithology densification rock sample pore-size distribution, crest is raised or is moved to right, illustrate that the contribution of permeability is affected substantially by macrovoid, as permeability contribution rate curve main peak is gradually deviated from throat distribution curve main peak, penetrating power is made to rely primarily on the contribution of a small amount of macrovoid, part is from nanoscale hole, this situation can make the reservoir exploitation difficulty will be very big, and substrate fluid is extremely difficult to be employed.
Application example:
The different permeability rank tight sand single pore throat permeability contribution rate Variations of long celebrating shows (shown in Fig. 6), and permeability is contributed essentially from submicron order hole, on a small quantity from nanoscale.When permeability reduction is to about 0.03mD, permeability contribution rate curve main peak is gradually deviated from throat distribution curve main peak so that penetrating power relies primarily on the contribution of a small amount of macrovoid, and part is from nanoscale hole.Therefore, long celebrating below 0.03mD reservoir exploitation difficulty will be very big, and substrate fluid is extremely difficult to be employed.
By aperture full size scattergram modal data, can also be averaged the evaluation of the physical parameters such as radius, main flow venturi, sorting coefficient, affected owing to these parameters are existed by microcrack calculating when, low volume data statistical result often regularity is the strongest, jumping characteristic is big, but by the available regular understanding of the statistics of mass data, next step should further investigate the regularity of distribution of different oil districts this type of physical parameter of compact reservoir.Studied by this, can be that resource assessment preferably provides crucial physical parameter, lay the foundation for seepage flow mechanism research simultaneously.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (1)
1. compact reservoir pore throat full size characterizes and the method for analysis, comprise the steps: one, data preferred:
A () prepares fine and close oil rock sample, test rock sample quality by balance, by slide gauge test rock sample length and diameter, and calculates rock sample volume, calculates rock sample density by quality and volume, oozes instrument test rock sample porosity by hole；
B () uses high-pressure mercury instrument Pore Master to carry out rock sample pressing hydrargyrum experiment, and by the percentage composition of total pore size volume shared by rock sample density, quality, porosity calculation difference pore throat interval volume, i.e. mercury injection method pore throat distribution frequency；
C () uses automatic isothermal adsorption instrument, it is 77.35K in temperature, low temperature nitrogen adsorption experiment is carried out, by the percentage composition of total pore size volume shared by rock sample density, quality, porosity calculation difference pore throat interval volume, i.e. absorption method throat distribution frequency between relative pressure 0.01-1MPa；
D () obtains absorption method pore throat cumulative distribution frequency diagram according to absorption method throat distribution frequency, and at the enterprising row interpolation of cumulative distribution frequency diagram, interpolation method selects point-to-point transmission linear interpolation or polynomial interopolation, interpolation point selects the point of mercury injection method pore throat cumulative distribution below frequency diagram 100nm, cumulative distribution frequency after interpolation is transformed into throat distribution frequency, and making absorption method throat distribution frequency translation after converting is revised throat distribution frequency；
The revised throat distribution frequency data of (e) mesoporous interval employing, and between grand porose area, use mercury injection method pore throat distribution frequency data, two kinds of data carry out interpolation at the separation 25nm in mesoporous and grand hole and are connected, and i.e. obtain comprehensive throat distribution frequency；
Two, data detection:
F () makes parallel rock sample, and to rock sample saturation water, carry out 0.14MPa, 0.28MPa, 1.38MPa and 2.76MPa centrifugal force the most successively, and front and back carry out NMR test the most centrifugal, by asking for the ratio of the semaphore after being centrifuged and the semaphore of saturated-water phase, the voids content of below below below below 1 μm, 0.5 μm, 0.1 μm, 0.05 μm can be obtained, such that it is able to draw NMR-to be centrifuged voids content cumulative distribution table；
G the comprehensive throat distribution frequency translation preferably gone out is comprehensive pore throat cumulative distribution frequency by (), and be centrifuged data with parallel rock sample NMR-and be plotted in same cumulative distribution table, sees whether that surmounting NMR-is centrifuged the point of cumulative distribution；Such as, Fig. 5 is centrifuged data with NMR-at 100nm point first and overlaps, illustrate that the data preferably gone out are higher in the cumulative amount of below 100nm, the most total cumulative amount is 102%, more than 100%, illustrate that below 100nm hole cumulative amount is inevitable higher, need to be modified;
H data are modified by (), correction step is: the following voids content of (1) pair radius 2nm retrains, owing to below 2nm hole great majority are invalid hole, the content of less hole can be arranged to 0 when retraining, cumulative distribution is controlled in the range of fair-sized；(2) if still deviation theory relation when following for radius 2nm content is tied to ultimate value 0, then check that abnormity point place is interval, row constraint of going forward side by side；As in Fig. 5,100nm point still surmounts NMR-centered plots, then need 50nm-100nm section is tested, find the abnormity point in this interval, suitably retrain；If deviation theory relation at 500nm, then check that 100nm-500nm is interval, by that analogy, checks one by one and revises;
(i) revised comprehensive pore throat cumulative distribution frequency is again converted to comprehensive throat distribution frequency and i.e. obtains pore throat full size distribution characteristics collection of illustrative plates；
(j) analysis to full size distribution characteristics collection of illustrative plates: the contribution plot of rock sample permeability is plotted in revised comprehensive throat distribution frequency, such as the increase with permeability, on the right side of different lithology densification rock sample pore-size distribution, crest is raised or is moved to right, illustrate that the contribution of permeability is affected substantially by macrovoid, as permeability contribution rate curve main peak is gradually deviated from throat distribution curve main peak, penetrating power is made to rely primarily on the contribution of a small amount of macrovoid, part is from nanoscale hole, this situation can make the reservoir exploitation difficulty will be very big, and substrate fluid is extremely difficult to be employed.
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