CN106443800B - A kind of nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks - Google Patents
A kind of nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks Download PDFInfo
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Abstract
The invention discloses a kind of nuclear-magnetism porosity correction methods of mafic-intermediate volcanic rocks, including：The volcanic rock rock core with different lithology and pore structure is chosen, its conventional porosity and nuclear-magnetism porosity are measured；It logs well in conjunction with ECS for statistical analysis to experimental data, mafic-intermediate volcanic rocks is determined to need the lowest limit to the corrected iron content of nuclear-magnetism porosity；It is preferred that influencing the susceptor minerals element of mafic-intermediate volcanic rocks nuclear-magnetism porosity, the calibration model of nuclear-magnetism porosity and ECS well logging Mineral Concentrations is established, the parameter in model is determined using fitting process is optimized；Finally calibration model is utilized to realize the correction to nuclear magnetic resonance log porosity, obtains the porosity curve of reflection stratum truth.The present invention establishes the calibration model of nuclear-magnetism porosity according to ECS well loggings, realizes the continuous correction to mafic-intermediate volcanic rocks nuclear magnetic resonance log porosity, improve the computational accuracy of nuclear magnetic resonance log porosity on the basis of volcanic rocks Physical Experiment.
Description
Technical field：
The invention belongs to the complex reservoir stratum logging evaluation technical fields in oil exploration, and in particular to a kind of middle base
Property volcanic rock nuclear-magnetism porosity correction method, this method is based on the middle base of petrophysics experiment and stratum element well logging (ECS)
Property volcanic rock nuclear magnetic resonance log porosity is corrected.
Background technology：
In oil-gas exploration, an important parameter of well log interpretation is exactly the quantitative calculating of porosity.Formation porosity
It calculates and mostly uses three porosity curve and porosity that nuclear magnetic resonance log is handled, it is continuous with nuclear magnetic resonance technique
It improves, nuclear magnetic resonance log is widely used, using quite ripe in conventional crumb rock stratum.
With deepening continuously for oil-gas exploration, the bad grounds such as volcanic rock are increasingly becoming exploration emphasis, and nuclear magnetic resonance log is in fire
Shan Yan is also used widely in stratum.For logging evaluation, volcanic rock mineralogical composition complicated and changeable leads to volcanic rock
Complex lithology is various, although each lithology can establish rock matrix model, the evaluation for transitional lithology porosity
There is also large errors.And nuclear magnetic resonance log handle to obtain porosity influenced by rock matrix in conventional crumb rock it is smaller, more
Intuitively；But in Stratum of Volcanic Rocks, nuclear-magnetism porosity in by rock paramagnet influenced, can cause in middle base volcano
Rock center bore porosity is obviously less than normal.
Domestic and foreign scholars have done a large amount of analysis, main needle to the influence factor of mafic-intermediate volcanic rocks nuclear-magnetism porosity at present
Influence of the paramagnetic ion content of material to nuclear-magnetism porosity in the gradient fields and saturated solutions that generated to paramagnet, it is real
Border is using relatively difficult.Also the nuclear-magnetism porosity correction model for having domestic scholars that single mineral element is utilized to establish, does not consider member
The start of calculation lower limit of cellulose content has certain limitation, directly affects the accurate evaluation of nuclear-magnetism porosity.
Invention content：
It is an object of the invention in view of problems of the prior art, provide a kind of nuclear-magnetism of mafic-intermediate volcanic rocks
Porosity correction method, this method utilize rock core rock Physical Experiment Data, nuclear magnetic resonance log data and stratum element well logging (ECS)
Data establishes mafic-intermediate volcanic rocks nuclear-magnetism porosity calculation model, relatively low to solve mafic-intermediate volcanic rocks stratum nuclear-magnetism porosity
Problem.
In order to achieve the above objectives, the present invention takes following technical scheme to realize：
A kind of nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks, includes the following steps：
1) the volcanic rock core sample with different lithology and pore structure is chosen, selected volcanic rock core sample is measured
Conventional porosity φ and nuclear-magnetism porosity φt；
2) the conventional porosity φ and nuclear-magnetism porosity for the volcanic rock core sample that step 1) is obtained in conjunction with ECS well loggings
φtIt is for statistical analysis, establish mafic-intermediate volcanic rocks routine porosity φ and nuclear-magnetism porosity φtDifference and stratum in iron member
The correlativity of cellulose content determines in mafic-intermediate volcanic rocks to the minimum lower limit of the corrected iron content of nuclear-magnetism porosity
Value WFe0；
3) when iron content is more than WFe0When, choose the paramagnetism mineral member for influencing mafic-intermediate volcanic rocks nuclear-magnetism porosity
Element, establishes the calibration model of nuclear-magnetism porosity and ECS well logging Mineral Concentrations, and the parameter in calibration model is quasi- using optimizing
Legal determination；
4) calibration model is utilized to realize the correction to nuclear-magnetism porosity, the hole for obtaining reflection stratum truth is write music
Line.
The present invention further changes machine and is, in step 1), measures the conventional porosity of selected volcanic rock core sample
φ and nuclear-magnetism porosity φtBe according to《Core analysis method (SY/T5336-2006)》With《Rock sample nuclear magnetic resonance parameter laboratory
Specifications of surveys (SY/T6490-2014)》Normal process carries out.
The present invention further changes machine and is, in step 2), mafic-intermediate volcanic rocks routine porosity φ and nuclear-magnetism porosity
φtDifference and stratum in iron content correlativity it is as follows：
φ-φt=a × WFe+b (1)
In formula, a, b are coefficient, are obtained using least square fitting by experimental data and ECS log datas；WFeFor
The percentage composition of ferro element in the stratum that ECS logs well.
The present invention further changes machine and is, in step 3), consider influence of the mineral element to rock matrix and
Influence of the paramagnet magnetic susceptibility to nuclear magnetic resonance log, it is core to choose over paramagnetism substance Fe and the weak paramagnet in part
The paramagnetism mineral element of magnetic porosity correction, establishes the phase between nuclear-magnetism porosity correction amount and paramagnetism Mineral Concentrations
Pass relationship, wherein weak paramagnet includes aluminium Al, calcium Ca and titanium Ti.
The present invention further changes machine and is, the phase between the nuclear-magnetism porosity correction amount established and Mineral Concentrations
Pass relationship is as follows：
Δ φ=φ-φt=c*WFe+d*WAl+e*WCa+f*WTi+g (2)
In formula, c, d, e, f and g are coefficient, are obtained by experimental data and ECS log datas using fitting is optimized；
Δ φ is nuclear-magnetism porosity correction amount, unit %；
WFeThe percentage composition of ferro element in the stratum logged well for ECS；
WAlThe percentage composition of aluminium element in the stratum logged well for ECS；
WCaThe percentage composition of calcium constituent in the stratum logged well for ECS；
WTiThe percentage composition of titanium elements in the stratum logged well for ECS.
The present invention further changes machine and is, in step 4), utilizes the mafic-intermediate volcanic rocks nuclear-magnetism porosity correction of foundation
The nuclear-magnetism porosity after the correction of stratum is calculated in conjunction with nuclear magnetic resonance log and ECS well-log informations in model.
The present invention further changes machine and is, in step 4), with nuclear magnetic resonance log porosityBased on, work as WFe＜ WFe0
When, it does not correct, works as WFe＞ WFe0When, it is corrected using following formula：
In formula, φtcFor the nuclear-magnetism porosity after correction；For the nuclear-magnetism porosity before correction；Δ φ is what model calculated
Nuclear-magnetism porosity correction amount, unit are %.
Compared with prior art, the present invention has the advantage that：
The present invention chooses representative volcanic rock rock core first, carries out category filter to rock core, screening out lithology is
The rock core of mafic-intermediate volcanic rocks；Using ECS log datas, corresponding rock core depth mineral element influential on rock matrix is extracted
Content；Conventional porosity, nuclear-magnetism porosity, nuclear magnetic resonance log data and the ECS log datas for finally utilizing experimental determination, are established
Suitable for the calibration model of mafic-intermediate volcanic rocks nuclear-magnetism porosity, finally calibration model is utilized to realize to nuclear magnetic resonance log porosity
Correction obtains the porosity curve of reflection stratum truth.
The present invention solves the relatively low difficult point of existing mafic-intermediate volcanic rocks formation porosity, logs well to obtain by introducing ECS
The over paramagnetism mineral element (iron Fe) and weak paramagnetism mineral element (aluminium Al, calcium Ca, titanium Ti) work more sensitive to skeleton
To calculate the important parameter of nuclear-magnetism porosity so that determining nuclear-magnetism porosity more meets actual formation and petrophysics property,
With higher precision.
Description of the drawings：
Fig. 1 is a kind of flow chart of the nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks provided by the invention；
Fig. 2 is the conventional porosity and nuclear-magnetism porosity relational graph of the laboratory measurement of the embodiment of the present invention；
Fig. 3 is the mafic-intermediate volcanic rocks routine porosity φ and nuclear-magnetism porosity φ of the embodiment of the present inventiontDifference and Fe hundred
Divide content correlativity figure；
Fig. 4 is that mafic-intermediate volcanic rocks model of the present invention calculates nuclear-magnetism porosity and conventional porosity correlativity figure；
Fig. 5 is the application effect figure of the present invention.
Specific implementation mode：
Below in conjunction with the accompanying drawings, specific implementation mode provided by the invention is described in further detail.
Referring to Fig. 1, a kind of nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks provided in an embodiment of the present invention, including such as
Lower step：
Step 101：Measure the conventional porosity φ and nuclear-magnetism porosity φ of selected volcanic rock core samplet；
Step 102：Establish mafic-intermediate volcanic rocks routine porosity and nuclear-magnetism porosity difference and iron content in stratum
Correlativity, determine influence nuclear-magnetism porosity iron content lower limiting value WFe0；
Step 103：Determine paramagnetism mineral element influential on rock matrix (iron Fe, aluminium Al, calcium Ca, titanium Ti)；
Step 104：According to the sensitive parameter that experimental data, nuclear magnetic resonance log data and the ECS that is extracted log well, establish
Mafic-intermediate volcanic rocks nuclear-magnetism porosity correction model；
Step 105：Work as WFe＞ WFe0When, nuclear magnetic resonance log porosity is corrected by above-mentioned model, is not otherwise corrected,
Obtain continuous nuclear magnetic resonance log porosity curve.
In the following, being described in further details by the specific implementation situation to the present embodiment, to support that the present invention to be solved
Certainly the technical issues of.
1, according to the rock core of Stratum of Volcanic Rocks section, log data data, the representative core sample of volcanic rock is chosen,
Measure its routine porosity φ and nuclear-magnetism porosity φt；
It selects the Carboniferous System Stratum of Volcanic Rocks section of an oil field block as research purpose layer in the present embodiment, collects target zone
The rock core information and well-log information of section, and 38 pieces of representative volcanic rock core sample is had selected according to these data,
16 pieces of middle mafic-intermediate volcanic rocks rock core, in the present embodiment, so-called representative rock core refers to the Lithology Discrimination figure established in the area
On the basis of version, according to the volcanic rock sample of the determined lithology of data such as conventional logging, special well logging；According to《Core analysis
Method (SY/T5336-2006)》、《Rock sample nuclear magnetic resonance parameter laboratory measurement specification (SY/T6490-2014)》Normal process
It is tested, measurement obtains conventional porosity φ and nuclear-magnetism porosity φt。
2, contain a certain amount of paramagnet in different volcanic rock, wherein over paramagnetism object in mafic-intermediate volcanic rocks
Matter content wants high compared with other lithology, and the nuclear-magnetism porosity of other lithology is influenced smaller by over paramagnetism substance, illustrates strong paramagnetic
There are lower limiting values for influence of the property content of material to nuclear-magnetism porosity.The conventional porosity φ and nuclear-magnetism porosity obtained to measurement
φtIt is compared (referring to Fig. 2), mafic-intermediate volcanic rocks nuclear-magnetism porosity φtIt is integrally more relatively low than conventional porosity φ.Analysis shows
This is because containing caused by higher over paramagnetism substance ferro element in mafic-intermediate volcanic rocks；And acidic rock and pyroclastic rock
Nuclear-magnetism porosity φtIt is suitable with conventional porosity φ, illustrate that over paramagnetism substance ferro element is to its nuclear-magnetism porosity in sample
Influence it is smaller, while showing that over paramagnetism substance ferro element in sample has the lower limiting value being had an impact to nuclear-magnetism porosity；
Depth playback is carried out to the mafic-intermediate volcanic rocks core sample that laboratory measures, corresponding points ECS is read and logs well to obtain
Over paramagnetism mineral element Fe percentage composition, establish conventional porosityWith nuclear-magnetism porosity φtDifference and Fe members in stratum
Plain percentage composition WFeBetween correlativity (referring to Fig. 3), the result φ-φ that the present embodiment obtainst=402.44*WFe-
22.996, the two related coefficient square R2=0.7743.
Enable φ-φt=0, then WFe=0.057, as the lower limiting value W of mineral element Fe contentsFe0=0.057, it obtains working as WFe
＞ WFe0When, it needs to carry out nuclear-magnetism porosity correction to mafic-intermediate volcanic rocks, otherwise does not correct；
3, over paramagnetism substance and paramagnet content are higher in mafic-intermediate volcanic rocks, therefore nuclear magnetic resonance log can be by
To seriously affecting for rock matrix；In view of rock forming mineral element (Si, Ca, Na, K, Fe, Al, the Ti to be logged well by ECS
Deng) it can determine the skeletal density value of rock, while Al, Ca, Ti are all paramagnet (magnetic susceptibility is positive value), although its
Magnetic susceptibility is much smaller than over paramagnetism substance Fe, but as long as there is the presence of paramagnet, more or less meeting influences nuclear magnetic resonance
Well logging；Therefore influence and paramagnet magnetic susceptibility of the mineral element to rock matrix are considered to nuclear magnetic resonance log
It influences；Finally other than choosing over paramagnetism substance Fe elements, it is nuclear-magnetism porosity also to choose weak paramagnet Al, Ca, Ti
The susceptor minerals element of correction.
4, extraction core sample corresponds to the percentage composition of paramagnet Al, Ca, Ti of depth point, in conjunction with rock physics reality
Test data, nuclear magnetic resonance log porosityWork as WFe＞ WFe0When, establish mafic-intermediate volcanic rocks routine porosity φ and nuclear-magnetism porosity
φtCorrelativity between difference and mineral element is obtained using fitting is optimized, mafic-intermediate volcanic rocks nuclear-magnetism hole can be obtained
The updating formula of degree：
In formula, φtcFor the nuclear magnetic resonance log porosity after correction；
For the nuclear magnetic resonance log porosity before correction；
WFeThe percentage composition of ferro element in the stratum logged well for ECS；
WAlThe percentage composition of aluminium element in the stratum logged well for ECS；
WCaThe percentage composition of calcium constituent in the stratum logged well for ECS；
WTiThe percentage composition of titanium elements in the stratum logged well for ECS.
5, for Stratum of Volcanic Rocks, on the basis of lithology accurately divides, by above-mentioned steps to mafic-intermediate volcanic rocks into
Row nuclear-magnetism porosity correction (referring to Fig. 4).
6, the nuclear-magnetism porosity design sketch calculated using nuclear magnetic resonance and ECS well-log informations shown in attached drawing 5, first in figure
For gamma ray curve, second is lithological profile, and third road is deep lateral resistivity curve, and the 4th is bent for three porosity
Line, the 5th is ferro element percentage composition curve in stratum (pack portion is more than ferro element lower limit value part), and the 6th is
Aluminium element percentage composition curve in stratum, the 7th is titanium elements percentage composition curve in stratum, and the 8th is calcium member in stratum
Plain percentage composition curve, the 9th is that (round shape point is analytic routines hole to nuclear magnetic resonance log process cores magnetic porosity curve
Degree), the tenth is nuclear-magnetism porosity curve after correction (round shape point is analytic routines porosity).In figure, the nuclear-magnetism before correction is surveyed
Wellhole porosity analyzes porosity significantly lower than petrophysics experiment, and the consistency for correcting latter two porosity is good, to demonstrate
The reliability of this method.
It should be noted last that the above specific implementation mode is merely illustrative of the technical solution of the present invention and unrestricted,
Although being described the invention in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit of the technical scheme of the invention and range, should all cover
In the scope of the claims of the present invention.
Claims (5)
1. a kind of nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks, which is characterized in that include the following steps：
1) the volcanic rock core sample with different lithology and pore structure is chosen, the normal of selected volcanic rock core sample is measured
Advise porosity φ and nuclear-magnetism porosity φt；
2) the conventional porosity φ and nuclear-magnetism porosity φ for the volcanic rock core sample that step 1) is obtained in conjunction with ECS well loggingstIt carries out
Mafic-intermediate volcanic rocks routine porosity φ and nuclear-magnetism porosity φ are established in statistical analysistDifference and stratum in iron content
Correlativity, determine in mafic-intermediate volcanic rocks to the lowest limit W of the corrected iron content of nuclear-magnetism porosityFe0；
3) when iron content is more than WFe0When, the paramagnetism mineral element for influencing mafic-intermediate volcanic rocks nuclear-magnetism porosity is chosen, is built
The calibration model of nuclear-magnetism porosity and ECS well logging Mineral Concentrations is found, the parameter in calibration model is using optimization fitting process
It determines；Specific method is：It is total to nuclear-magnetism to consider influence and paramagnet magnetic susceptibility of the mineral element to rock matrix
It shakes the influence of well logging, chooses over paramagnetism substance Fe and paramagnetism mineral that the weak paramagnet in part is nuclear-magnetism porosity correction
Element establishes the correlativity between nuclear-magnetism porosity correction amount and paramagnetism Mineral Concentrations, wherein weak paramagnet
Including aluminium Al, calcium Ca and titanium Ti；And the correlativity between the nuclear-magnetism porosity correction amount established and Mineral Concentrations is such as
Under：
Δ φ=φ-φt=c*WFe+d*WAl+e*WCa+f*WTi+g (2)
In formula, c, d, e, f and g are coefficient, are obtained by experimental data and ECS log datas using fitting is optimized；
Δ φ is nuclear-magnetism porosity correction amount, unit %；
WFeThe percentage composition of ferro element in the stratum logged well for ECS；
WAlThe percentage composition of aluminium element in the stratum logged well for ECS；
WCaThe percentage composition of calcium constituent in the stratum logged well for ECS；
WTiThe percentage composition of titanium elements in the stratum logged well for ECS；
4) it utilizes calibration model to realize the correction to nuclear-magnetism porosity, obtains the porosity curve of reflection stratum truth.
2. the nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks according to claim 1, which is characterized in that step 1)
In, measure the conventional porosity φ and nuclear-magnetism porosity φ of selected volcanic rock core sampletBe according to《Core analysis method
SY/T5336-2006》With《Rock sample nuclear magnetic resonance parameter laboratory measurement specification SY/T6490-2014》Normal process carries out.
3. the nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks according to claim 1, which is characterized in that step 2)
In, mafic-intermediate volcanic rocks routine porosity φ and nuclear-magnetism porosity φtDifference and stratum in iron content correlativity
It is as follows：
φ-φt=a × WFe+b (1)
In formula, a, b are coefficient, are obtained using least square fitting by experimental data and ECS log datas；WFeIt is surveyed for ECS
The percentage composition of ferro element in the stratum that well obtains.
4. the nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks according to claim 1, which is characterized in that step 4)
In, using the mafic-intermediate volcanic rocks nuclear-magnetism porosity correction model of foundation, in conjunction with nuclear magnetic resonance log and ECS well-log informations, meter
Calculate the nuclear-magnetism porosity after obtaining stratum correction.
5. the nuclear-magnetism porosity correction method of mafic-intermediate volcanic rocks according to claim 4, which is characterized in that step 4)
In, with nuclear magnetic resonance log porosityBased on, work as WFe＜ WFe0When, it does not correct, works as WFe＞ WFe0When, using following formula
It is corrected：
In formula, φtcFor the nuclear-magnetism porosity after correction；For the nuclear-magnetism porosity before correction；Δ φ is the nuclear-magnetism that model calculates
Porosity correction amount, unit are %.
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| CN107829731B (en) * | 2017-11-06 | 2020-10-09 | 陈国军 | Clay alteration volcanic porosity correction method |
| CN108507923A (en) * | 2018-03-29 | 2018-09-07 | 中国地质大学（北京） | Rock core magnetic nuclear resonance analyzer porosity measurement precision is examined and bearing calibration |
| CN109343133B (en) * | 2018-11-01 | 2020-04-24 | 中石化石油工程技术服务有限公司 | Hole enlargement section porosity correction method based on two-dimensional nuclear magnetic resonance logging technology |
| CN112049623B (en) * | 2019-06-05 | 2024-05-28 | 中国石油天然气股份有限公司 | Method and device for judging water outlet of medium-base volcanic bound water |
| CN111220522A (en) * | 2019-10-28 | 2020-06-02 | 中国石油大学(华东) | Core scale logging calculation method for hydrate saturation of high-argillaceous fine-grained sediment |
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