CN108896462A - Conglomerate porosity determination method - Google Patents
Conglomerate porosity determination method Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention provides a conglomerate porosity measuring method, which comprises the following steps: determination of the initial volume V of a rock sampleSThe rock sample is a full-diameter core of conglomerate; installing gaskets on two end faces of the rock sample; embedding the rock sample; measuring the pore volume V of the rock sample under the condition of formation pressure by using a Boyle's law double-chamber methodP1(ii) a According to the pore volume V of the rock sampleP1And an initial volume VSAnd calculating to obtain the porosity POR of the rock sample1. According to the invention, the gaskets are arranged at the two ends of the rock sample, the rock sample is embedded, so that the processed rock sample is not easy to loosen and crack under the formation pressure, the porosity of the rock sample under the formation pressure condition can be accurately measured by utilizing the double-chamber method of Boyle's law, and a technical support is provided for research on conglomerate reservoirs and resource quantity evaluation.
Description
Technical field
The invention belongs to porosity determination field more particularly to a kind of conglomerate porosity determination methods.
Background technique
As the important kind of China's oil and gas reservoir, conglomerate is the object of geologist's research, especially in the recent period, along with
The discovery in the Junggar Basin ring Ma lake area area conglomerate great You and Bohai gulf basin Dongying Depression north slope conglomerate scale reserves area (is finished
Adopted spring, 2002；It is violent etc. to thank to wind, 2002；It rectifies the beginning of spring etc., 2014；Tang Yong etc., 2014；Randt's text etc., 2014；Pang Dexin, 2015；
Wang Yongshi etc., 2016), become important field of research by the coarse grain sedimentary system of core of conglomerate.Lacunarity analysis is reservoir
The basis of evaluation is not only the preferred important evidence of Favorable Reservoir, and is related to oil and gas resource evaluation, therefore generally closed
Note.Currently, lacunarity analysis requires rock sample to have well-regulated shape, according to oil and gas industry standard SY/T 5336-
2006, general is mostly the small column that diameter is 2.54cm or 3.8cm.Conglomerate Reservoir is different from conventional sandstone reservoir, due to
Conglomerate is big with granularity, the miscellaneous base content of shale is high, the problems such as causing Conglomerate Reservoir than more loose, easily fall grain, rupture, because
This diameter is the extremely difficult preparation of plunger rock sample of 2.54cm or 3.8cm, full-hole core also extremely difficult load confining pressure in continuous mode,
And it is difficult to eliminate the influence that grain causes surface crater, therefore porosity determination becomes the problem of puzzlement conglomerate evaluation.
Physical property is measured for Conglomerate Reservoir at present, needs to carry out protection processing to rock sample before test, avoids people to greatest extent
For the generation in crack, the unexpected damage of rock sample in experimentation is prevented, reduces influence of the crack to experimental result.A wherein conglomerate
Porosity test method process is as follows：
(1) 502 glue are smeared on rock sample surface, glue applying amount depends on the loosening degree of rock sample, as far as possible holding rock sample
Particle is not fallen on surface, after the completion of smearing, rock sample is placed in 60~80 DEG C of baking oven, and drying is stand-by；
(2) after rock sample drying, rock sample is placed in full diameter porosity measuring instrument, measures hole according to the process of setting
Degree, is allowed to meet the requirements.
There are following defects for above-mentioned conglomerate porosity measurement method：
(1) experiment success rate is low, since cementing power of 502 glue to unconsolidated rock itself is limited, conglomerate is caused to consolidate
Effect is bad, easily leads to falling grain, destroying for rock sample in experimentation, therefore measures and can not load during porosity and stratum
The identical confining pressure of pressure causes the reduction of result accuracy；
(2) since 502 glue have stronger permeability, cause to have 502 different degrees of immersions inside rock sample, influence
Physical property measurement result；Meanwhile 502 glue can not be fully populated with conglomerate surface and fall pit caused by grain, this partial volume is in hole
It can be included in pore volume range in porosity continuous mode, cause experimental result bigger than normal；
(3) 502 glue are limited to conglomerate consolidation effect, for guarantee rock sample integrality, test before not to rock sample into
Row washing oil is handled, and is still had the influence of residual organic matter in rock sample, is directly affected the accuracy of experimental result.
In the prior art, another test method of conglomerate porosity is weight in wet base method, and weight in wet base method is to enter rock sample using fluid
Front and back quality and volume change calculate porosity.Water is met in order to avoid shale or the high rock sample of tufaceous content to expand, and is made
It is destroyed at rock sample, mostly uses kerosene as measuring medium, main operating process is as follows：
(1) appropriate kerosene is added in graduated measuring cup, records kerosene volume；
(2) rock sample quality being measured with balance and being recorded, be then integrally immersed into rock sample in kerosene, record at this time carve by measuring cup
Degree, two scales subtract each other to obtain rock sample volume；
(3) rock sample completes saturation in kerosene, then takes out, is cleaned out the kerosene on rock sample surface with filter paper, then benefit
Rock sample quality is measured with balance, two quality are subtracted each other, and obtain the kerosene quality immersed in hole, then divided by kerosene density, obtain
The kerosene volume in hole is immersed, is approximately pore volume；
(4) porosity is calculated divided by rock sample volume in pore volume.
There are following defects for the method for above-mentioned weight in wet base method measurement conglomerate porosity：
(1) degree of saturation of the fluids such as kerosene directly determines experimental result in rock sample.Since conglomerate easily falls grain, broken
It is bad, therefore can only be saturated using normal pressure in saturation process and either vacuumize saturation, pressurization saturation, therefore kerosene etc. can not be used
Saturated with fluid is ineffective, causes experimental result less than normal；
(2) it is the integrality for guaranteeing rock sample, washing oil processing is not carried out to rock sample before test, still have residual organic in rock sample
The influence of matter directly affects the accuracy of experimental result；
(3) experimental result only represents the porosity of rock sample under condition of normal pressure, can not measure rock sample under condition of formation pressure
Porosity.
Summary of the invention
The present invention is for during solving existing conglomerate porosity determination, existing because conglomerate falls grain, rupture and can not set
The problems such as strata pressure, so as to cause can not accurately measure conglomerate porosity.
In order to solve the above technical problem, the present invention provides a kind of conglomerate porosity determination methods, including：
Measure the initial volume V of rock sampleS, which is the full-hole core of conglomerate；
Gasket is installed on two end faces of rock sample；
Embedding treatment is carried out to rock sample；
Using Boyle's law dual chamber method, the pore volume V of rock sample under condition of formation pressure is measuredP1；
According to the pore volume V of rock sampleP1With initial volume VS, the porosity POR of rock sample is calculated1。
Further, to the quality W for after rock sample progress embedding treatment further including rock sample after measurement embedsBS, it is calculated
The porosity POR of rock sample1Further include later：
Using weight in wet base method, the pore volume V of rock sample under condition of formation pressure is measuredP2；
According to pore volume VP2With initial volume VS, the porosity POR of rock sample is calculated2；
Compare porosity POR1With porosity POR2If porosity POR1With porosity POR2Difference is no more than predetermined threshold,
Then by porosity POR1As conglomerate porosity, otherwise, redeterminate.
Further, using hygrometry, the pore volume V of rock sample under condition of formation pressure is measuredP2Process include：
Rock sample is placed in core holding unit；
Core holding unit confining pressure is set as strata pressure；
The injection test liquid into core holding unit, when liquid to be tested flows out core holding unit, takes out rock sample；
Gross mass W after measuring rock sample penetration test liquidSS；
According to the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBS, rock sample is calculated
Pore volume VP2。
Further, according to the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBS, calculate
To the pore volume V of rock sampleP2Process include：
By the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBSSubtract each other, obtains immersing rock sample
Test liquid quality WO；
According to the test liquid quality W for immersing rock sampleOTest liquid volume is calculated, by test liquid volume approximation etc.
In the pore volume V of rock sampleP2。
Further, it is provided with flow guiding connector on the gasket, when carrying out embedding treatment to rock sample, by rock sample and flow deflector
It is totally immersed into embedding medium, flow guiding connector does not immerse in embedding medium.
Further, carrying out embedding treatment later to rock sample further includes：By the flow guiding connector and methylene chloride appearance on rock sample
Device is connected, and by the methylene chloride injection rock sample in methylene chloride container, to carry out washing oil processing to rock sample, dries after the completion of washing oil
Dry core sample.
Further, the initial volume V of rock sample is measuredSFurther include before：Discrete particles position in rock sample is consolidated
It is fixed, two end faces of rock sample are cut flat with.
Further, using Boyle's law dual chamber method, the pore volume V of rock sample under condition of formation pressure is measuredP1Mistake
Journey includes：
Rock sample is placed in the pore volume analyzer based on Boyle's law dual chamber method；
Hole volume determining instrument confining pressure is set as strata pressure；
Helium is injected into pore volume analyzer；
Balance pressure after recording helium initial pressure and stablizing, the balance pressure according to helium initial pressure and after stablizing
Measure the pore volume of rock sample；
Retest is multiple, using the average value of multiple pore volume as the pore volume V of rock sampleP1。
The present invention carries out embedding treatment to rock sample by installing gasket at rock sample both ends, such that treated rock sample
Be not easy under strata pressure loose and be not likely to produce crackle, using Boyle's law dual chamber method can Accurate Determining rock sample on stratum
Porosity under pressure condition provides technical support with RESERVE EVALUATION for Conglomerate Reservoir research.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the flow chart of the conglomerate porosity determination method of one embodiment of the invention；
Fig. 2 is the flow chart of the conglomerate porosity determination method of another embodiment of the present invention；
Fig. 3 is the flow chart of the conglomerate porosity determination method of further embodiment of this invention；
Fig. 4 is the structural schematic diagram of the reference chamber of the pore volume analyzer of one embodiment of the invention；
Fig. 5 is the structural schematic diagram of the pore volume analyzer of one embodiment of the invention.
Specific embodiment
In order to keep technical characterstic and effect of the invention more obvious, technical solution of the present invention is done with reference to the accompanying drawing
It further illustrates, the specific example that the present invention can also have other different is illustrated or implements, anyone skilled in the art
The equivalents done within the scope of the claims belong to protection category of the invention.
In the description of this specification, reference term " embodiment ", " specific embodiment ", " such as " etc. description meaning
Refer to that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or show
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples
It can be combined in any suitable manner.The step of involved in each embodiment, sequentially is used to schematically illustrate implementation of the invention, step therein
Suddenly it is sequentially not construed as limiting, can appropriately adjust as needed.
Need specification, rock sample described in the present embodiment is not if made specified otherwise, after referring both to previous step processing
Obtained rock sample.
As shown in FIG. 1, FIG. 1 is the flow charts of the conglomerate porosity determination method of one embodiment of the invention, specifically, conglomerate
Porosity determination method includes：
Step 01, the initial volume V of rock sample is measuredS, which is the full-hole core of conglomerate.
Specifically, the volume V of rock sample can be measured in such a way that rock sample is integrally immersed aviation kerosineS, the present invention couple
The specific mensuration mode of volume is without limitation.Full-hole core is the cylindrical body of diameter 10cm, can reflect conglomerate structure comprehensively,
Improve conglomerate porosity measurement precision.
In some embodiments, for the ease of subsequent step operation, the measurement accuracy of conglomerate porosity is improved, measures rock sample
Initial volume VSFurther include before：Discrete particles position in rock sample is fixed, two end faces of rock sample are cut flat with.Specifically
When implementation, it can use 502 glue and the discrete particles position of rock sample carried out tentatively fixed, when cutting uses aviation kerosine as cold
But medium.It completes after fixing and cutting flat with operation, by rock sample as in baking oven, drying and processing is carried out to it.
Step 02, gasket is installed on two end faces of rock sample.
Specifically, gasket is, for example, stainless steel diversion piece, and diameter can be identical as rock sample end face, also can be slightly less than rock
Sample end face, thickness are, for example, 1cm, the present invention to the material of gasket, size without limitation.When it is implemented, in order to guarantee gasket
It is bonded to each other with rock sample end face, gasket is fixed on rock sample end face by the mode that fastened by screw can be used.It, can by this step
It prevents embedding material from entering rock sample end face, influences test result, while can prevent from cracking in rock sample pressure process, influence
Test result.
Step 03, embedding treatment is carried out to rock sample.When implementation, rock sample can be placed into epoxy resin and be carried out at embedding
Reason.
Step 05, using Boyle's law dual chamber method, the pore volume V of rock sample under condition of formation pressure is measuredP1。
In some embodiments, in order to guarantee the accuracy of porosity measurement, above-mentioned steps 05 are double using Boyle's law
Room method measures the pore volume V of rock sample under condition of formation pressureP1Process include：
Rock sample is placed in (as shown in Figure 5) in the pore volume analyzer based on Boyle's law dual chamber method, sets confining pressure
For strata pressure, (helium is injected into pore volume analyzer, record helium is initial using the pore volume of helium measurement rock sample
Pressure and stablize after balance pressure, according to helium initial pressure and stablize after balance piezometry rock sample pore volume),
Retest repeatedly (such as three times), using the average value of multiple pore volume as the pore volume V of rock sampleP1。
Step 06, according to the pore volume V of rock sampleP1With initial volume VS, the hole of rock sample is calculated by following formula
Porosity POR1：POR1=VP1/VS。
This implementation utilizes embedding method, handles conglomerate rock sample that is easily loose, falling grain, such that treated rock sample
It is enough to be not easy under strata pressure loose and be not likely to produce crackle, using Boyle's law dual chamber method measurement rock sample in strata pressure item
Porosity under part provides technical support with RESERVE EVALUATION for Conglomerate Reservoir research so that porosity measurement is more accurate.
In order to further ensure the measurement accuracy of porosity, in one embodiment of the invention, as shown in Fig. 2, above-mentioned steps 03
The quality W that embedding treatment also measures rock sample after embedding later is carried out to rock sampleBS, the porosity of rock sample is calculated in above-mentioned steps 06
POR1Further include later：
Step 07, using weight in wet base method, the pore volume V of rock sample under condition of formation pressure is measuredP2。
Step 08, according to pore volume VP2With initial volume VS, the porosity of rock sample is calculated using following formula
POR2：POR2=VP2/VS。
Step 09, porosity POR is compared1With porosity POR2If porosity POR1With porosity POR2Difference is no more than pre-
Determine threshold value, then by porosity POR1As conglomerate porosity, otherwise, repeats step 01~step 07 and redeterminate.
Predetermined threshold described in the present embodiment can be determining according to the desired measurement accuracy of implementer, and for example 10%, the present invention
This is not especially limited.
The present embodiment utilizes wave using the porosity that weight in wet base method (utilizing the method that core holding unit measures) measures to verify
The porosity that adopted ear law dual chamber method measures, can be improved the accuracy of conglomerate porosity.
In one embodiment of the invention, above-mentioned steps 07 measure the pore volume V of rock sample under condition of formation pressureP2Process packet
It includes：
Step 071, rock sample is placed in core holding unit；
Step 072, core holding unit confining pressure is set to measure strata pressure；
Step 073, the injection test liquid into core holding unit when liquid to be tested flows out core holding unit, stops full
With taking-up rock sample；
Step 074, the gross mass W after rock sample penetration test liquid is measuredSS；
Step 075, according to the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBS, calculate
To the pore volume V of rock sampleP2。
Specifically, step 075 is according to the gross mass W after rock sample penetration test liquidSSWith the quality of rock sample after embedding
WBS, the pore volume V of rock sample is calculatedP2Process include：
By the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBSSubtract each other, obtains immersing rock sample
Test liquid quality WO；
According to the test liquid quality W for immersing rock sampleOTest liquid volume is calculated, by test liquid volume approximation etc.
In the pore volume V of rock sampleP2。
In one embodiment of the invention, flow guiding connector is provided on the gasket of rock sample, step 03 carries out embedding treatment to rock sample
When, rock sample and flow deflector are totally immersed into embedding medium, flow guiding connector does not immerse in embedding medium.As shown in figure 3, above-mentioned step
Rapid 03 pair of rock sample carries out：
Step 04, the flow guiding connector on rock sample is connected with methylene chloride container, by the dichloromethane in methylene chloride container
Alkane, which injects, carries out washing oil processing in rock sample, rock sample is dried after the completion of washing oil.
The present embodiment can guarantee by the flow guiding connector on gasket and gasket when carrying out washing oil processing to rock sample, so that
Methylene chloride on conglomerate rock sample, prevents destruction of the methylene chloride to conglomerate rock sample by gasket peptizaiton.The present embodiment energy
Enough cleanings that rock sample remained on surface organic matter is realized under the premise of guaranteeing that conglomerate rock sample is complete, prevent rock sample remained on surface organic
The influence of confrontation porosity measurement result.
Illustrate technical solution of the present invention to become apparent from, is described in detail below with a specific embodiment：
(1) it takes out and observes conglomerate full-hole core rock sample to be determined and utilized if there are discrete particles on rock sample surface
502 glue carry out discrete particles position tentatively fixed, are cut flat with two end faces of rock sample using mechanical cutter, and when cutting uses boat
Empty kerosene is as cooling medium, after cutting flat with, places it in baking oven and dries, such as setting drying box temperature 70 C, heating time 1
Hour.
(2) gross mass that rock sample is measured using the balance that precision is 0.001g, is recorded as WS；Selection suitably has scale amount
Appropriate aviation kerosine is added in cylinder, records kerosene volume V at this time1, then rock sample is integrally submerged into kerosene, record kerosene at this time
Volume V2, the two subtracts each other to obtain the volume V of rock sampleS.When implementation, Immersion time of the rock sample in kerosene is reduced to the greatest extent, such as do not surpass
1 minute is spent, to avoid kerosene from entering inside rock sample to the greatest extent.
It with filter paper by the aviation kerosine wiped clean on rock sample surface, then places it in baking oven, such as setting temperature 70
DEG C, heating time 15 minutes, to remove rock sample surface and the internal aviation kerosine that may be disseminated comprehensively.
(3) diameter is placed respectively on two end faces of rock sample for 6cm circle stainless steel gasket, outside stainless steel gasket
Flow guiding connector is connect, is fixed between stainless steel gasket and rock sample using screw, guarantees that guide face is fitted closely with rock sample end face,
Closure of the epoxy resin to guide face during subsequent embedding is reduced to greatest extent.
(4) rock sample is placed in epoxy resin embedding device and starts to embed, guarantee rock sample, stainless steel gasket and fixed screw
It is completely immersed in epoxy resin, but connector does not immerse epoxy resin；90 DEG C of epoxy resin melt temperature, 10 DEG C/minute of cooling velocity
Clock, it is whole to embed time control within 30 minutes.
(5) the rock sample quality after measurement embedding, and rock sample volume is measured using aviation kerosine, it is recorded as W respectivelyBSAnd VBS。
Using the specific implementation of aviation kerosine measurement rock sample volume referring to step (2), details are not described herein again.
(6) rock sample after embedding is placed in pressurization device for washing oil, washing oil is carried out to rock sample using methylene chloride, is removed residual
Hydrocarbon is stayed, when it is implemented, cleaning time is not less than 24 hours, entire rock sample is placed in baking oven after the completion of washing oil, weighs and surveys
Determine volume, is recorded as W respectivelyBSRAnd VBSR。
(7) the pore volume analyzer (as shown in Figure 4, Figure 5) based on Boyle's law dual chamber method is calibrated, is determined
Benchmark building volume VrWith system dead volume Vd, benchmark building volume refers to the corresponding volume of helium initial pressure, i.e. progress pore volume meter
Initial volume when calculation, system dead volume refer to the segment spaces such as connecting line, switch, valve, that is, connected system
The rock sample prepared (rock sample that step (6) obtains) is then placed in elastic rubber sleeve 410, and the two of rock sample by intrinsic volume
End is respectively put into the elastomeric pad 420 that a diameter is equal to rock sample diameter, thickness 1cm, and flow guiding connector is reserved in elastomeric pad centre
430 positions guarantee that elastomeric pad and epoxy resin end face are in close contact.Main purpose is prevented due to epoxy resin end face injustice
It is whole cause rock sample with instrument end face there are holes, influence test result.
(8) apply confining pressure in the outer surface of elastic rubber sleeve 410, confining pressure is equal with strata pressure, it is desirable that pore volume measurement
Instrument pressure is uniformly distributed, and to guarantee that rock sample outer surface confining pressure data are identical, setting confining pressure main purpose is that press strip is covered in reduction underground
The compressibility of rock sample interstitial space under part, improves the accuracy of result.
(9) reference chamber initial absolute pressure P is measured1, helium row is entered into reference chamber, records pressure, then by reference chamber
Gas be discharged into the interstitial space of rock sample, absolute pressure (the balance pressure after stablizing) P after record expansion2.According to reference chamber
Interior gaseous mass balance, the dead volume of system and valve volume derives rock sample pore volume calculation formula, is specifically shown in formula
1, formula 2 and formula 3.
P1Vr/Z1T1r+Pa(Vp+Vd)/ZaT1=P2(Vr+Vp+Vd+Vv)/Z2T2(formula 1)
In formula：P1For benchmark room initial absolute pressure；P2For the absolute pressure after expansion；PaIt is initial absolute in rock sample
Atmospheric pressure；Z1For P1And T1When deviation factor for gas；Z2For P2And T2When deviation factor for gas；ZaFor PaAnd T1When gas
Body deviation factors；T1rFor P1When reference chamber absolute temperature；T1For PaWhen rock sample interstitial space absolute temperature；T1For P2Balance
The absolute temperature of rock sample and reference chamber afterwards；VrFor benchmark building volume；VpFor rock sample pore volume；VvIt is valve displacement volume (by closing
It closes to open position)；VdFor system dead volume.
It is assumed that isothermy (T1=T2=T1r) set up, then
P1Vr/Z1+Pa(Vp+Vd)/Za=P2(Vr+Vp+Vd+Vv)/Z2(formula 2)
Formula 1 merges with formula 2, obtains pore volume calculation formula
Vp=[Vr(P1Z2/P2Z1-1)-Vv]/(1-PaZ2/P2Za)-Vd(formula 3)
3 pore volumes of replication are averaged the pore volume V final as rock sampleP1。
(10) by pore volume VP1Divided by rock sample total volume VS, rock sample porosity POR is calculated1。
(11) embedding rock sample is taken out from pore volume analyzer, is placed in full-hole core clamper, confining pressure is set
It is similar to formation condition, after vacuumizing 24 hours, reasonable injection pressure is set, aviation kerosine is injected in rock sample, wait export
After aviation kerosine output is seen at end, stops injection aviation kerosine, take out rock sample, measure rock sample gross mass, be recorded as WSS。
(12) by WSSWith WBSSubtract each other, determine the aviation kerosine gross mass being saturated in rock sample, with gross mass divided by aviation coal
The density of oil, obtains the aviation kerosine volume being saturated in rock sample, it is assumed that rock sample is fully saturated, then the volume of aviation kerosine
Just pore volume in approximate equivalent rock sample, is recorded as VP2。
(13) pore volume V is utilizedP2Divided by rock sample total volume VS, rock sample porosity POR is calculated2。
(14) two kinds of porositys are compared as a result, if POR1With POR2Difference is no more than 10%, using POR1, otherwise need to be according to
Step 7 redeterminates rock sample to step 13.
The present embodiment carries out embedding treatment to rock sample by installing gasket on two end faces of rock sample, using epoxy resin,
It can guarantee that the rock sample obtained after processing will not be destroyed in pressure process；It can by the flow guiding connector on gasket and gasket
Prevent destruction of the methylene chloride of washing oil to conglomerate rock sample；During porosity measurement, confining pressure and strata pressure phase are set
Together, rock sample porosity under the conditions of true geology can be measured；Using helium actual measurement in such a way that weight in wet base method combines, it can integrate
It determines rock sample porosity, guarantees the measurement accuracy of porosity.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above is only used to illustrate the technical scheme of the present invention, any those of ordinary skill in the art can without prejudice to
Under spirit and scope of the invention, modifications and changes are made to the above embodiments.Therefore, the scope of the present invention should regard
Subject to scope of the claims.
Claims (10)
1. a kind of conglomerate porosity determination method, which is characterized in that including：
Measure the initial volume V of rock sampleS, which is the full-hole core of conglomerate；
Gasket is installed on two end faces of rock sample；
Embedding treatment is carried out to rock sample；
Using Boyle's law dual chamber method, the pore volume V of rock sample under condition of formation pressure is measuredP1；
According to the pore volume V of rock sampleP1With initial volume VS, the porosity POR of rock sample is calculated1。
2. the method as described in claim 1, which is characterized in that further include after measurement embeds after carrying out embedding treatment to rock sample
The quality W of rock sampleBS, the porosity POR of rock sample is calculated1Further include later：
Using weight in wet base method, the pore volume V of rock sample under condition of formation pressure is measuredP2；
According to pore volume VP2With initial volume VS, the porosity POR of rock sample is calculated2；
Compare porosity POR1With porosity POR2If porosity POR1With porosity POR2Difference is no more than predetermined threshold, then will
Porosity POR1As conglomerate porosity, otherwise, redeterminate.
3. method according to claim 2, which is characterized in that utilize hygrometry, measure the hole of rock sample under condition of formation pressure
Gap volume VP2Process include：
Rock sample is placed in core holding unit；
Core holding unit confining pressure is set as strata pressure；
The injection test liquid into core holding unit, when liquid to be tested flows out core holding unit, takes out rock sample；
Gross mass W after measuring rock sample penetration test liquidSS；
According to the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBS, the pore-body of rock sample is calculated
Product VP2。
4. method as claimed in claim 3, which is characterized in that according to the gross mass W after rock sample penetration test liquidSSAnd embedding
The quality W of rock sample afterwardsBS, the pore volume V of rock sample is calculatedP2Process include：
By the gross mass W after rock sample penetration test liquidSSWith the quality W of rock sample after embeddingBSSubtract each other, obtains the test for immersing rock sample
Liquid quality WO；
According to the test liquid quality W for immersing rock sampleOTest liquid volume is calculated, test liquid volume is approximately equal to rock
The pore volume V of sampleP2。
5. method as claimed in claim 3, which is characterized in that the test liquid is aviation kerosine.
6. such as method described in any one of claim 1 to 5, which is characterized in that flow guiding connector is provided on the gasket, to rock
When sample carries out embedding treatment, rock sample and flow deflector are totally immersed into embedding medium, flow guiding connector does not immerse in embedding medium.
7. method as claimed in claim 6, which is characterized in that carrying out embedding treatment later to rock sample further includes：It will be on rock sample
Flow guiding connector be connected with methylene chloride container, by methylene chloride container methylene chloride injection rock sample in, with to rock sample into
The processing of row washing oil, washing oil dry rock sample after the completion.
8. method as claimed in claim 6, which is characterized in that the embedding medium includes epoxy resin.
9. such as method described in any one of claim 1 to 5, which is characterized in that measure the initial volume V of rock sampleSIt also wraps before
It includes：Discrete particles position in rock sample is fixed, two end faces of rock sample are cut flat with.
10. such as method described in any one of claim 1 to 5, which is characterized in that utilize Boyle's law dual chamber method, measurement ground
The pore volume V of rock sample under the conditions of stressor layerP1Process include：
Rock sample is placed in the pore volume analyzer based on Boyle's law dual chamber method；
Hole volume determining instrument confining pressure is set as strata pressure；
Helium is injected into pore volume analyzer；
Balance pressure after recording helium initial pressure and stablizing, the balance piezometry according to helium initial pressure and after stablizing
The pore volume of rock sample；
Retest is multiple, using the average value of multiple pore volume as the pore volume V of rock sampleP1。
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