CN107560994A - Aperture location mode in one kind evaluation mud shale organic matter, clay and other mineral - Google Patents
Aperture location mode in one kind evaluation mud shale organic matter, clay and other mineral Download PDFInfo
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Abstract
Aperture location mode in one kind evaluation mud shale organic matter, clay and other mineral, belongs to natural gas exploration field.This method can evaluate the pore volume distribution feature of nanometer range in shale reservoir organic matter, clay mineral and other mineral.Steps of the method are：1. TOC, cheese root element composition, total rock analysis and low temperature nitrogen adsorption and desorption experiment are carried out to same set of more than 3 samples of shale reservoir；2. calculate each sample content of organic matter using each shale reservoir sample TOC and kerogen Elemental Composition analysis result；3. according to shale reservoir sample organic matter, clay mineral, other mineral contents and adsorption isotherm experiment result, the pore volume evaluation model of each pore diameter range in organic matter, clay mineral and other mineral is established；4. calculate the pore volume of each pore diameter range in shale reservoir organic matter, clay mineral, other mineral.
Description
Technical field
The present invention relates to aperture location mode in one kind evaluation mud shale organic matter, clay and other mineral, belong to natural
Gas exploration technical field.
Background technology
Shale gas is main body to adsorb with free state preservation in the stratum such as the mud stone with hydrocarbon generation capacity and shale
Gas accumulation, free gas and adsorbed gas are two kinds of main preservation modes of shale gas in shale reservoir.Free gas is mainly deposited
It is crack, macropore and the small hole center space of shale reservoir, adsorbed gas is primarily present in the pore wall week of nanoscale hole
Enclose.The hole contrast surface area contribution of Nano grade protrudes in shale reservoir, has weight to preservation ADSORPTION STATE shale Gas content
Want control action.Especially organic hole of Nano grade, clay mineral intercrystalline pore have weight to preservation ADSORPTION STATE shale gas
Contribute.At present, measuring the method for shale Nano grade hole has the experiment of low temperature nitrogen absorption-desorption, electron microscopic imaging, pressure
Mercury method and Three Dimensional Reconfiguration.But these methods can not evaluate organic matter in shale reservoir, clay mineral and other ore deposits respectively
The pore volume of different pore size in thing.Low temperature nitrogen absorption-desorption tests the hole that can obtain different pore size in mud shale sample
Gap volume, but it can not be evaluated the pore volume of different pore size in organic matter, clay mineral and other mineral respectively.Electricity
Sub- micro-imaging technique can effectively observe shale microstructure among pores, type, but only obtain the qualitative of two dimensional surface and retouch
State, lack 3-D quantitative evaluation.Mercury injection method measurement is the pore volume being connected with the throat of different pore size, and cannot be distinguished by
The pore volume of different pore size in machine matter, clay mineral and other mineral.Three Dimensional Reconfiguration is ground to shale microstructure
Study carefully, it may be determined that micron-sized shale cube mesoporous character and pore volume, but the sample diameter of the technical Analysis is got over
Small resolution ratio is higher.The shale granular size of its quantitative assessment is 1 ~ 5um, if can overcome the anisotropism of shale reservoir
And result is representative query be present.
Therefore, the present invention is made up of cheese root element, total rock is analyzed and low temperature nitrogen absorption-desorption experimental result, build
The pore volume evaluation model of each pore diameter range, quantitative assessment shale reservoir in vertical organic matter, clay mineral and other mineral
The pore volume of each pore diameter range in organic matter, clay mineral, other mineral.
The content of the invention
The purpose of the present invention is：Aperture location mode in a kind of evaluation mud shale organic matter of offer, clay and other mineral,
Realize the quantitative assessment to each pore diameter range pore volume in shale reservoir organic matter, clay mineral, other mineral.Overcome existing
There are technology, method not to open each pore diameter range pore volume in shale reservoir organic matter, clay mineral, other mineral effectively
The shortcomings that evaluating by exhibit valency.
The technical solution adopted by the present invention is：Aperture location mode in evaluation mud shale organic matter, clay and other mineral,
It is characterized in that：
Step 1：More than 3 samples of same set of shale reservoir are carried out TOC contents, cheese root element composition, total rock analysis and
Low temperature nitrogen absorption-desorption is tested, and the mass percent for obtaining TOC in each shale reservoir sample is respectively wTOC1、wTOC2、…
And wTOCn, carbon mass percent is respectively w in kerogenC1、wC2... and wCn, protium mass percent point in kerogen
Wei not wH1、wH2... and wHn, oxygen element mass percent is respectively w in kerogenO1、wO2... and wOn, nitrogen in kerogen
Mass percent is respectively wN1、wN2... and wNn, element sulphur mass percent is respectively w in kerogenS1、wS2... and wSn, glue
The mass percent of native mineral is respectively wClay 1、wClay 2... and wClay n, the mass percent of other mineral is respectively wOther 1、
wOther 2... and wOther n, pore diameter range is respectively in each shale reservoir sample<2nm、2-5 nm、5-10nm、10-20nm、20-
50nm, 50-100nm and 100-200nm pore volume are Vij, wherein i=1,2 ..., n, be shale reservoir sample numbering,
J=1,2 ..., 7, be pore diameter range numbering, TOC, clay mineral and other mineral quality percentages in shale reservoir sample
Unit be %, carbon, hydrogen, oxygen, nitrogen and element sulphur mass percent unit are % in kerogen, each hole of shale reservoir sample
The pore volume unit of footpath scope is cm3/g;
Step 2：Utilize each shale reservoir sample TOC mass percents wTOC1、wTOC2... and wTOCn, carbon matter in kerogen
Measure percentage wC1、wC2... and wCn, quality of organic matter percentage in each shale reservoir sample is calculated according to the following formula
wOrganic matter 1、wOrganic matter 2... and wOrganic matter n
wOrganic matter i=wTOCi/ wCi×100%
In formula, i=1,2 ..., n, be shale reservoir sample numbering, shale reservoir sample TOC mass percents, kerogen
The unit of quality of organic matter percentage is % in middle carbon mass percent and shale reservoir sample；
Step 3：According to the mass percent w that each mud shale sample clay mineral is obtained in step 1Clay 1、wClay 2... and wClay n, its
The mass percent w of its mineralOther 1、wOther 2... and wOther n, and pore diameter range is respectively in each mud shale sample of unit mass<
2nm, 2-5 nm, 5-10nm, 10-20nm, 20-50nm, 50-100nm and 100-200nm pore volume Vij, and obtained in step 2
The mass percent w of each shale reservoir sample organic matter obtainedOrganic matter 1、wOrganic matter 2... and wOrganic matter n, establish equation below group and mesh
Scalar functions, as object function f (VOrganic matter-j, VClay-j, VOther-j) value minimum when, you can obtain unit mass organic matter, clay pit
The pore volume V for the pore diameter range that numbering is j in thing and other mineralOrganic matter j、VClay jAnd VOther j,
Wherein, VOrganic matter j、VClay jAnd VOther jIt is the unit mass organic matter, clay mineral and other ore deposits of the set shale reservoir respectively
In thing numbering be j pore diameter range pore volume, j=1,2 ..., 7, be pore diameter range numbering, i=1,2 ..., n, be mud page
The numbering of rock reservoir samples, the mass percent unit of organic matter, clay mineral and other mineral is equal in shale reservoir sample
For %, the pore volume unit of each pore diameter range is cm in unit mass mud shale sample3/ g, unit mass organic matter, clay
The pore volume unit of each pore diameter range is cm in mineral and other mineral3/g；
Step 4：According to the equation group and object function in step 3, shale reservoir unit mass organic matter, clay pit are calculated
Pore diameter range is respectively in thing, other mineral<2nm, 2-5nm, 5-10nm, 10-20nm, 20-50nm, 50-100nm and 100-
200nm pore volume Vij, wherein i=1,2 ..., n, be shale reservoir sample numbering, j=1,2 ..., 7, be aperture model
The numbering enclosed, the pore volume unit of each pore diameter range is cm3/g.Beneficial effects of the present invention：Present invention evaluation mud shale
Aperture location mode in organic matter, clay and other mineral, realize to shale reservoir organic matter, clay mineral and other ore deposits
The quantitative assessment of each pore diameter range pore volume in thing, and the evaluation method is easily operated, low-cost, the mud page evaluated
Each pore diameter range pore volume is necessary important in shale gas exploration in rock reservoir organic matter, clay mineral and other mineral
Parameter.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment：
Embodiment 1：As described in Figure 1, aperture location mode in a kind of evaluation mud shale organic matter, clay and other mineral, contains
Following steps；
Step 1：TOC contents, cheese root element composition, total rock analysis and low temperature are carried out to same set of 5 samples of shale reservoir
Nitrogen adsorption-desorption experiment, the mass percent for obtaining TOC in 5 shale reservoir samples is respectively 3.35%, 2.84%,
1.93%th, 1.43% and 0.97%, carbon mass percent is respectively 87.98%, 85.57%, 87.01%, 86.19% in kerogen
With 86.72%, protium mass percent is respectively 2.69%, 1.96%, 2.66%, 1.54% and 1.91% in kerogen, kerogen
Middle oxygen element mass percent is respectively 4.93%, 6.39%, 6.26%, 7.24% and 6.84%, nitrogen quality percentage in kerogen
Than being respectively 1.89%, 2.42%, 2.40%, 2.30% and 2.10%, in kerogen element sulphur mass percent be respectively 2.51%,
3.66%th, 1.67%, 2.73% and 2.43%, the mass percent of clay mineral is respectively 30.30%, 25.70%, 45.45% and
41.60%, the mass percent of other mineral is respectively 66.36%, 71.71%, 52.75% and 56.91%, low temperature nitrogen absorption-solution
Inhaling pore diameter range in experiment 5 samples of acquisition is respectively<2nm、2-5 nm、5-10nm、10-20nm、20-50nm、50-100nm
1 is shown in Table with the data of 100-200nm pore volume.
Table 1
Step 2：Using 5 shale reservoir sample TOC mass percents 3.35%, 2.84%, 1.93%, 1.43% and 0.97%, do
Carbon mass percent 87.98%, 85.57%, 87.01%, 86.19% and 86.72% in junket root, 5 are calculated according to the following formula
Shale reservoir sample quality of organic matter percentage is respectively 3.81%, 3.32%, 2.22%, 1.66% and 1.12%,
wOrganic matter i=wTOCi/ wCi×100%
In formula, i=1,2 ..., 5, be shale reservoir sample numbering.
Step 3：According in step 1 obtain 5 mud shale sample clay minerals mass percent 30.30%, 25.70%,
45.45% and 41.60%, the mass percent 66.36%, 71.71%, 52.75% and 56.91% of other mineral, 5 of unit mass
Pore diameter range is respectively in mud shale sample<2nm, 2-5 nm, 5-10nm, 10-20nm, 20-50nm, 50-100nm and 100-
200nm pore volume, and in step 2 obtain 5 shale reservoir sample quality of organic matter percentages 3.81%, 3.32%,
2.22%th, 1.66% and 1.12%, equation below group and object function are established, as object function f (VOrganic matter-j, VClay-j, VOther-j) value
When minimum, you can obtain the pore volume of the pore diameter range that numbering is j in unit mass organic matter, clay mineral and other mineral
VOrganic matter j、VClay jAnd VOther j,
Wherein, VOrganic matter j、VClay jAnd VOther jIt is the unit mass organic matter, clay mineral and other ore deposits of the set shale reservoir respectively
In thing numbering be j pore diameter range pore volume, j=1,2 ..., 7, be pore diameter range numbering, i=1,2,3,4,5 are mud pages
Rock sample number into spectrum, wOrganic matter 1、wOrganic matter 2、wOrganic matter 3、wOrganic matter 4And wOrganic matter 5It is the quality of organic matter percentage of 5 mud shale samples respectively,
wClay 1、wClay 2、wClay 3、wClay 4... and wClay 5It is the clay mineral quality percentage of 5 mud shale samples respectively, wOther 1、wOther 2、
wOther 3、wOther 4And wOther 5It is the mass percent of other mineral of 5 mud shale samples respectively, it is organic in shale reservoir sample
The mass percent unit of matter, clay mineral and other mineral is %, the hole of each pore diameter range in unit mass mud shale sample
Gap volume unit is cm3/ g, the pore volume list of each pore diameter range in unit mass organic matter, clay mineral and other mineral
Position is cm3/g。
Step 4：According to the equation group and object function in step 3, shale reservoir unit mass organic matter, clay are calculated
Pore diameter range is respectively in mineral, other mineral<2nm, 2-5nm, 5-10nm, 10-20nm, 20-50nm, 50-100nm and 100-
200nm pore volume, the results are shown in Table 2.
Table 2
Claims (1)
1. aperture location mode in one kind evaluation mud shale organic matter, clay and other mineral, it is characterised in that：
Step 1：More than 3 samples of same set of shale reservoir are carried out TOC contents, cheese root element composition, total rock analysis and
Low temperature nitrogen absorption-desorption is tested, and the mass percent for obtaining TOC in each shale reservoir sample is respectively wTOC1、wTOC2、…
And wTOCn, carbon mass percent is respectively w in kerogenC1、wC2... and wCn, protium mass percent point in kerogen
Wei not wH1、wH2... and wHn, oxygen element mass percent is respectively w in kerogenO1、wO2... and wOn, nitrogen in kerogen
Mass percent is respectively wN1、wN2... and wNn, element sulphur mass percent is respectively w in kerogenS1、wS2... and wSn, glue
The mass percent of native mineral is respectively wClay 1、wClay 2... and wClay n, the mass percent of other mineral is respectively wOther 1、
wOther 2... and wOther n, pore diameter range is respectively in each shale reservoir sample<2nm、2-5 nm、5-10nm、10-20nm、20-
50nm, 50-100nm and 100-200nm pore volume are Vij, wherein i=1,2 ..., n, be shale reservoir sample numbering,
J=1,2 ..., 7, be pore diameter range numbering, TOC, clay mineral and other mineral quality percentages in shale reservoir sample
Unit be %, carbon, hydrogen, oxygen, nitrogen and element sulphur mass percent unit are % in kerogen, each hole of shale reservoir sample
The pore volume unit of footpath scope is cm3/g;
Step 2：Utilize each shale reservoir sample TOC mass percents wTOC1、wTOC2... and wTOCn, carbon matter in kerogen
Measure percentage wC1、wC2... and wCn, quality of organic matter percentage in each shale reservoir sample is calculated according to the following formula
wOrganic matter 1、wOrganic matter 2... and wOrganic matter n
wOrganic matter i=wTOCi/ wCi×100%
In formula, i=1,2 ..., n, be shale reservoir sample numbering, shale reservoir sample TOC mass percents, kerogen
The unit of quality of organic matter percentage is % in middle carbon mass percent and shale reservoir sample；
Step 3：According to the mass percent w that each mud shale sample clay mineral is obtained in step 1Clay 1、wClay 2... and wClay n, its
The mass percent w of its mineralOther 1、wOther 2... and wOther n, and pore diameter range is respectively in each mud shale sample of unit mass<
2nm, 2-5 nm, 5-10nm, 10-20nm, 20-50nm, 50-100nm and 100-200nm pore volume Vij, and obtained in step 2
The mass percent w of each shale reservoir sample organic matter obtainedOrganic matter 1、wOrganic matter 2... and wOrganic matter n, establish equation below group and mesh
Scalar functions, as object function f (VOrganic matter-j, VClay-j, VOther-j) value minimum when, you can obtain unit mass organic matter, clay pit
The pore volume V for the pore diameter range that numbering is j in thing and other mineralOrganic matter j、VClay jAnd VOther j,
Wherein, VOrganic matter j、VClay jAnd VOther jIt is the unit mass organic matter, clay mineral and other ore deposits of the set shale reservoir respectively
In thing numbering be j pore diameter range pore volume, j=1,2 ..., 7, be pore diameter range numbering, i=1,2 ..., n, be mud page
The numbering of rock reservoir samples, the mass percent unit of organic matter, clay mineral and other mineral is equal in shale reservoir sample
For %, the pore volume unit of each pore diameter range is cm in unit mass mud shale sample3/ g, unit mass organic matter, clay
The pore volume unit of each pore diameter range is cm in mineral and other mineral3/g；
Step 4：According to the equation group and object function in step 3, shale reservoir unit mass organic matter, clay pit are calculated
Pore diameter range is respectively in thing, other mineral<2nm, 2-5nm, 5-10nm, 10-20nm, 20-50nm, 50-100nm and 100-
200nm pore volume Vij, wherein i=1,2 ..., n, be shale reservoir sample numbering, j=1,2 ..., 7, be aperture model
The numbering enclosed, the pore volume unit of each pore diameter range is cm3/g。
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| CN109540764A (en) * | 2018-12-13 | 2019-03-29 | 中国石油大学(华东) | A method of evaluation shale reservoir organic matter, clay and the contributed hole preservation ADSORPTION STATE methane thickness and density of other mineral |
| CN110018293A (en) * | 2019-05-05 | 2019-07-16 | 西安石油大学 | It is a kind of to consider the water-sensitive multiphase coupled methane air content calculation method of shale clay |
| CN110132816A (en) * | 2019-05-15 | 2019-08-16 | 重庆地质矿产研究院 | Method for analyzing pore structure of organic matter in shale of ancient world |
| CN111537390A (en) * | 2020-06-11 | 2020-08-14 | 中国石油大学(华东) | Method for evaluating increment of organic porosity of reservoir during shale oil thermal upgrading exploitation |
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| CN113049785A (en) * | 2021-04-08 | 2021-06-29 | 中国石油大学(华东) | Method for evaluating methane in various components of shale reservoir in adsorption state |
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