CN110162878A - The determination method of the crude oil filling pore throat lower limit of compact reservoir - Google Patents
The determination method of the crude oil filling pore throat lower limit of compact reservoir Download PDFInfo
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Abstract
The present invention relates to a kind of calculation methods of petroleum geology research field, in particular relate to a kind of determination method of the crude oil filling pore throat lower limit of compact reservoir, include the following steps: the relationship of (1) based on the power and resistance during filling, when residual compression P is equal with capillary force Pc, then reach filling lower limit；(2) it according to the balanced relationship of the power and resistance during filling, calculates and determines that crude oil fills pore throat lower limit.The present invention has deepened the understanding of fine and close oil filling mechanism, it is the supplement to fine and close oil at hiding geological theory, a kind of effective means are provided for the prediction of fine and close oil distribution range, thus have huge guiding value and wide application prospect in unconventional oil and gas Exploration Domain at present and in the future.
Description
Technical field
The present invention relates to a kind of calculation methods of petroleum geology research field, in particular relate to one kind by means of basin numerical value
The method that analogy method determines crude oil filling pore throat lower limit inside oil-gas bearing basin compact reservoir interface and reservoir.
Background technique
Fine and close oil is the important Exploration Domain of current and future petroleum resources, the reservoiring mechanism of fine and close oil, such as filling mechanism,
Specific understanding is not yet received in seepage flow mechanism, preservation and Accumulation Mechanism.The filling pore throat lower limit of fine and close oil and in Filling process
The variation for filling pore throat lower limit is the matter of utmost importance to be solved.Pore throat filling lower limit refers to that in Hydrocarbon accumulation process, oil gas exists
Overcome migration resistance to fill the minimum physical property boundary line of reservoir under specific geological conditions.Therefore, under different accumulating conditions
Lower limit is filled with different pore throats, even if at hiding evolutionary process, which is also variation under specific accumulating condition
's.
Constraint water film thickness is added by middle petroleum exploration and development research institute Zou ability etc. with maximum asphaltene molecule diameter (4nm)
Reckoning show that fine and close oily reservoir pore throat lower limit is 54nm, and computation model is shown in Fig. 1, and wherein Figure 1B is the partial cutaway view of Figure 1A,
(a) it is critical pore throat radius 54nm, be (b) pore throat diameter is 200nm, (c) fettering moisture film average thickness is 50nm.This use
The projectional technique of water film thickness and oil molecule diameter adduction is fettered, it is simple and efficient, rough pore throat lower limit can be obtained.But it is this
Method is confined to static description, to a certain extent departing from actual geological conditions and Oil & Gas Reservoir Formation Conditions, could not also illustrate
The variation of pore throat lower limit is filled during crude oil filling.Root is returned in filling pore throat lower limit and its variation during crude oil filling
Tie bottom be to be determined by the balance of power and resistance, it by reservoir internal characteristics, Characteristics of Hydrocarbon Source Rocks, oil property, bury
Hide the combined influence of the factors such as depth and burial history.
The big equal statistical relationship according to residual oil content and average pore size of middle petroleum exploration and development research institute Cui Jing, it is believed that Hubei Province
It is about 15nm that the basin Er Duosi, which extends seven sections of group leader fine and close oil filling lower limits,.The fine and close oil filling pore throat of the example statistical description
Lower limit can be smaller, the theoretical value obtained different from Zou Caineng etc..But this method is based entirely on the statistics in aperture and residual quantity
Relationship, one side statistical number strong point is very little, can not reflect practical geological condition, the boundary of another aspect oil-bearing layer and non-oil-bearing layer
Value is also based on the catastrophe point on statistical relationship and carrys out fixed, shortage geologic basis.
Wu Kang army, Chinese Petroleum Univ. etc. has obtained fine and close oil at hiding physical simulation experiment using fine and close oil and has wanted shape
It is 0.12 μm at the filling pore throat lower limit of extensive oil reservoir.The physical simulation experiment shows that filling pore throat lower limit is to store up pressure difference with source
It is related.But the experiment condition of physical simulation experiment differs greatly with practical geological conditions, and the sample of selection does not have company yet
Continuous property, it should based on data and understanding that physical simulation experiment obtains, establish the pass with dynamics intension in universal significance
It is formula, can just derives more accurate pore throat filling lower limit in this way.
China Petroleum Univ. (East-China) Wang Weiming etc. establishes the pass of water film thickness and throat radius under Different Strata pressure
System, plate are shown in Fig. 2, and wherein straight line C indicates that water film thickness is equal to pore throat diameter, and the region A on straight line C indicates that throat radius is small
In water film thickness, region B indicates that throat radius is greater than water film thickness.And it is filled according to the relationship of water film thickness and porosity
Porosity cutoff.According to the analysis, corresponding pore throat and its micro-pore controlled will be by beams when throat radius is less than water film thickness
It ties up water to be saturated, only when throat radius is greater than water film thickness, venturi could become the effective filling channel of fine and close oil.But this is recognized
Weight sensing point is whether the relationship of water film thickness and strata pressure and venturi are occupied by moisture film entirely, it is emphasised that " whether there is can
The remaining space filled by crude oil ".In fact, there are such remaining space, crude oil may not be able to be filled into.
Middle petroleum exploration and development research institute flood it is equal based on filling mechanical balance relationship obtain Ordos Basin extension group,
Filling pore throat lower limit point near Sichuan Basin low~middle Jurassic, U.S.'s Williston basin Bakken group fine and close oil sources storage interface
Not Wei 15.74nm, 29.06nm and 14.22nm, inside reservoir filling pore throat lower limit be respectively 39.45nm, 37.20nm and
52.32nm.The basic principle that this method is applied to is also filling kinetic balance relationship, it is understood that source storage interface and reservoir
Internal pore throat filling lower limit is different, and has refined the understanding of filling mechanism.But in the method, source caused by hydrocarbon pressurization
Residual compression inside storage pressure difference and reservoir is transformed into maximum buried depth too simpleization, especially there is (more phases) lift
In the case where liter-sedimentation, the variation that pressure difference and residual compression are stored up in source is not to be simply positively correlated with depth.Formation fracture simultaneously
In the case of using formation fracture pressure and do not have to fluid pressure value must discuss, the fluid pressure because even formation fracture, in stratum
Power or existing, not release completely.In addition, the selection of key parameter is so that cannot obtain in Filling process in this method
Pore throat fills the variation of lower limit, causes and not enough deepens to the understanding of filling process.
Summary of the invention
Existing insufficient for the above-mentioned prior art and research, the present invention provides one kind to be based on basin numerical simulation method
It is used to determine the calculating side of the crude oil filling pore throat lower limit inside reservoir interface and reservoir with hydrocarbon charge kinetic balance principle
Method.
The present invention provides a kind of determination method of the crude oil filling pore throat lower limit of compact reservoir, includes the following steps:
(1) relationship based on the power and resistance during filling, when residual compression P is equal with capillary force Pc, then
Reach filling lower limit；
(2) it according to the balanced relationship of the power and resistance during filling, calculates and determines that crude oil fills pore throat lower limit.
Wherein, the balanced relationship of the power and resistance during the filling in the step (2) are as follows:
Wherein, P is filling power, MPa；Pc is filling resistance, i.e. capillary force, MPa；σ is gas-water interface tension, N/m；
θ is angle of wetting, °；R is to fill critical pore throat radius, m.
Wherein, the residual compression in the step (1), when filling pore throat is located at reservoir interface, the residue at reservoir interface
Evolution of formation pressure is obtained by basin modelling method, and it is quantitatively turned to the function of time；When filling pore throat is located in reservoir
When portion, the residual compression inside reservoir obtains formation temperature Evolutionary History using basin modelling method by fluid state equation calculation,
And then residual compression evolution quantitative expression inside available reservoir.
Wherein, the relationship that the residual compression at the reservoir interface changes over time are as follows:
PS-R=f (t)
Wherein, PS-RFor the residual compression at reservoir interface, MPa；T is time, Ma.
Wherein, the crude oil at compact reservoir interface fills pore throat lower limit are as follows:
Wherein, dS-RPore throat lower limit is filled for the crude oil at reservoir interface, m is generally converted to nm；rS-RFor the original at reservoir interface
Oil filling pore throat radius, m are generally converted to nm.
Wherein, the residual compression inside the reservoir with stratum temperature change relational expression are as follows:
Wherein, PRFor the residual compression inside reservoir, MPa；PFFor the Fluid pressure inside reservoir, MPa；PwFor in reservoir
The hydrostatic pressure in portion, MPa；R=8.3145J/ (molK)；T is formation temperature, k；VmFor the molal volume of crude oil, ml/mol；
A=3.0346Vw-5.43；B=0.1975A2.0679；α=3.1725A3.0456；The ω+2.071 of β=1.539；VwFor rubbing for water flooding
That volume, Vw=150mL/mol；ω=0.68；ρ is stratum water density, kg/m3；G is acceleration of gravity, value 9.8N/kg；h
For buried depth of strata, m.
Wherein, the residual compression inside the reservoir is mainly related with formation temperature, molal volume, buried depth of strata, mole
The variation of volume mainly due to caused by the variation of component during oil generation, utilizes formation temperature Temporal Evolution history and ground
Layer buried depth Temporal Evolution history then residual compression evolution quantitative expression inside available reservoir, the Fluid pressure inside reservoir
With the relational expression of stratum temperature change are as follows:
PF=f (T)=f'(t)
Wherein, T is formation temperature, k；T is time, Ma；
Buried depth of strata can be determined as the function of time, therefore the evolutionary process of hydrostatic pressure by basin modelling method are as follows:
PW=f " (t)；
The functional relation of residual compression and time inside reservoir are as follows:
PR=PF-PW=f'(t)-f " (t).
Wherein, the crude oil inside compact reservoir fills pore throat lower limit are as follows:
Wherein, dRPore throat lower limit is filled for the crude oil inside reservoir, m is generally converted to nm；rRFor the crude oil inside reservoir
Pore throat radius is filled, m is generally converted to nm.
The beneficial effects of the present invention are: the determination method of the crude oil filling pore throat lower limit of compact reservoir of the invention, 1. says
It is variation in Filling process that pore throat filling lower limit, which is illustrated, it is not a fixed value；2. illustrating crude oil filling process is
The process of residual compression decaying, corresponding pore throat filling lower limit become larger；3. explaining pore throat from kinetics mechanism
The variation characteristic for filling lower limit establishes the calculation formula of pore throat filling lower limit.The present invention has deepened fine and close oil filling mechanism
Understanding is the supplement to fine and close oil at hiding geological theory, and the prediction for fine and close oil distribution range provides a kind of effective means,
Thus there are huge guiding value and wide application prospect in unconventional oil and gas Exploration Domain at present and in the future.
Detailed description of the invention
Fig. 1 is the fine and close oilhole larynx filling lower limit derivation pattern (DM) figure based on adsorbed film of water thickness；
Fig. 2 is water film thickness and throat radius relationship plate under Different Strata pressure condition；
The functional relation diagram that the reservoir interface residual compression that Fig. 3 present invention is implemented changes over time；
Fig. 4 is the functional relation diagram that the formation temperature that the present invention is implemented changes over time；
Fig. 5 is the functional relation diagram that the buried depth of strata that the present invention is implemented changes over time, and wherein Fig. 5 A and Fig. 5 B is pair
The schematic diagram and curve graph answered；
Fig. 6 is the residual compression variation and corresponding pore throat filling lower limit during the filling that the present invention is implemented.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples.
Method for determining the crude oil filling pore throat lower limit inside compact reservoir interface and reservoir of the invention, including such as
Lower step:
(1) relationship based on the power and resistance during filling, when residual compression (P) is equal with capillary force (Pc)
When, then reach filling lower limit；
(2) the residual compression evolutionary process at the reservoir interface described in is obtained by basin modelling method, and it is quantitatively turned to
The function of time；
The functional relation that the residual compression at the reservoir interface obtained by basin modelling method developed with the time are as follows:
PS-R=f (t)；
Wherein, PS-RFor the residual compression at reservoir interface, MPa；T is time, Ma.
In the present invention, the residual compression evolutionary process inside the reservoir is obtained by fluid state equation；
Wherein, PRFor the residual compression inside reservoir, MPa；R=8.3145J/ (molK)；T is formation temperature, k；VmFor
The molal volume of crude oil, ml/mol；A=3.0346Vw-5.43；B=0.1975A2.0679；α=3.1725A3.0456；β=1.539
ω+2.071；VwFor the molal volume of water flooding, Vw=150mL/mol；ω=0.68；ρ is stratum water density, kg/m3；G attaches most importance to
Power acceleration, value 9.8N/kg；H is buried depth of strata, m.
Residual compression inside reservoir is mainly related with formation temperature, molal volume and buried depth of strata, the change of molal volume
Change is mainly to put aside that oil genetic component changes due to caused by the variation of component during oil generation.Therefore, stratum temperature is utilized
Spend Temporal Evolution history and buried depth of strata Temporal Evolution history then available reservoir inside residual compression evolution quantitative expression.
As shown in Figure 4, the formation temperature can be determined its evolutionary process by basin modelling method are as follows:
T=f'(t)；
Wherein, T is formation temperature, k；T is time, Ma.
As shown in figure 5, the buried depth of strata can be determined its evolutionary process by basin modelling method are as follows:
H=f " (t)；
The functional relation of residual compression and time inside the reservoir are as follows:
PR=f (T)-ρ gh=f'(t)-f " (t)；
The capillary force is
Wherein, σ is gas-water interface tension, N/m；θ is angle of wetting, °；R is critical pore throat radius, m；
The pore throat at the reservoir interface of one of the present invention fills lower limit are as follows:
Wherein, dS-RPore throat lower limit is filled for the crude oil at reservoir interface, m is generally converted to nm；rS-RFor the original at reservoir interface
Oil filling pore throat radius, m are generally converted to nm.
Pore throat inside the reservoir of one of the present invention fills lower limit are as follows:
Wherein, wherein dRPore throat lower limit is filled for the crude oil inside reservoir, m is generally converted to nm；rS-RFor reservoir inside
Crude oil fill pore throat radius, m is generally converted to nm.
The beneficial effects of the present invention are: illustrating that pore throat filling lower limit is variation in Filling process, it is not one
Fixed value；Illustrate that crude oil filling process is the process of residual compression decaying, corresponding pore throat filling lower limit becomes larger；
The variation characteristic of pore throat filling lower limit is explained from kinetics mechanism, establishes the calculation formula of pore throat filling lower limit.This hair
The bright understanding for having deepened fine and close oil filling mechanism is the supplement to fine and close oil at hiding geological theory, for fine and close oil distribution range
Prediction provides a kind of effective means, thus has huge guiding price in unconventional oil and gas Exploration Domain at present and in the future
Value and wide application prospect.
If Fig. 3 is to obtain evolution of geopressure field process using basin numerical simulation method；As shown in figure 3, by reservoir interface
Residual compression evolutionary process be fitted to the functional relation of time:
PS-R=f (t)=- 0.00008t5+0.004t4-0.101t3+0.951t2-5.299t+32.11；
Wherein, PS-RFor the residual compression at reservoir interface, MPa；T is time, Ma.
The capillary force calculation formula are as follows:
Wherein, σ is gas-water interface tension, N/m；θ is angle of wetting, °；R is critical pore throat radius, m；
According to the kinetic balance relationship at the pore throat filling lower limit, the pore throat filling lower limit at reservoir interface can be obtained
Are as follows:
Wherein, σ=0.172* ρoil-113.55；ρoil=916kg/m3；θ=0 °；T value is between 20Ma~0Ma.
As shown in fig. 6, can be obtained reservoir interfaces between 20Ma~0Ma residual compression evolutionary process and corresponding hole
Larynx fills lower limit variation process.
The residual compression inside reservoir is obtained according to fluid state equation calculation are as follows:
PRFor the residual compression inside reservoir, MPa；PFFor the Fluid pressure inside reservoir, MPa；PwIt is quiet inside reservoir
Water pressure, MPa；R=8.3145J/ (molK)；T is formation temperature, k；VmFor the molal volume of crude oil, ml/mol；A=
3.0346Vw-5.43；B=0.1975A2.0679；α=3.1725A3.0456；The ω+2.071 of β=1.539；VwFor mole of water flooding
Volume, Vw=150mL/mol；ω=0.68；ρ is stratum water density, kg/m3；G is acceleration of gravity, value 9.8N/kg；H is
Buried depth of strata, m.
Fluid pressure inside the reservoir is represented by the functional relation of formation temperature:
PF=f (T)=f'(t)=- 0.009t2-0.086t+59.9
Wherein, T is formation temperature, k；T is time, Ma.
Buried depth of strata can be determined as the function of time, therefore the evolutionary process of hydrostatic pressure by basin modelling method are as follows:
PW=f " (t)=- 0.003t3+0.094t2-1.841t+38.63
The functional relation of residual compression and time inside reservoir are as follows:
PR=PF-PW=f'(t)-f " (t)=0.003t3-0.103t2+1.755t+21.27
According to the kinetic balance relationship at the pore throat filling lower limit, the pore throat filling lower limit inside reservoir can be obtained
Are as follows:
Wherein, σ=0.172* ρoil-113.55；ρoil=916kg/m3；θ=0 °；T value is between 20Ma~0Ma.
As shown in fig. 6, the residual compression evolutionary process between 20Ma~0Ma inside reservoir and corresponding pore throat can be obtained
Fill lower limit variation process.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (8)
1. a kind of determination method of the crude oil filling pore throat lower limit of compact reservoir, which comprises the steps of:
(1) relationship based on the power and resistance during filling then reaches when residual compression P is equal with capillary force Pc
Fill lower limit；
(2) it according to the balanced relationship of the power and resistance during filling, calculates and determines that crude oil fills pore throat lower limit.
2. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 1, which is characterized in that described
The balanced relationship of the power and resistance during filling in step (2) are as follows:
Wherein, P is filling power, MPa；Pc is filling resistance, i.e. capillary force, MPa；σ is gas-water interface tension, N/m；θ is
Angle of wetting, °；R is to fill critical pore throat radius, m.
3. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 2, which is characterized in that described
Residual compression in step (1), when filling pore throat is located at reservoir interface, the residual compression evolutionary process at reservoir interface is by basin
Analogy method obtains, and it is quantitatively turned to the function of time；Residue when filling pore throat is located inside reservoir, inside reservoir
Pressure obtains formation temperature Evolutionary History by fluid state equation calculation, using basin modelling method, and then obtains surplus inside reservoir
Remaining pressure evolution quantitative expression.
4. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 3, which is characterized in that described
The relationship that the residual compression at reservoir interface changes over time are as follows:
PS-R=f (t)
Wherein, PS-RFor the residual compression at reservoir interface, MPa；T is time, Ma.
5. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 4, which is characterized in that fine and close
The crude oil at reservoir interface fills pore throat lower limit are as follows:
Wherein, dS-RPore throat lower limit is filled for the crude oil at reservoir interface, m is generally converted to nm；rS-RCrude oil for reservoir interface fills
Pore throat radius is infused, m is generally converted to nm.
6. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 3, which is characterized in that described
Residual compression inside reservoir with stratum temperature change relational expression are as follows:
Wherein, PRFor the residual compression inside reservoir, MPa；PFFor the Fluid pressure inside reservoir, MPa；PwInside reservoir
Hydrostatic pressure, MPa；R=8.3145J/ (molK)；T is formation temperature, k；VmFor the molal volume of crude oil, ml/mol；A=
3.0346Vw-5.43；B=0.1975A2.0679；α=3.1725A3.0456；The ω+2.071 of β=1.539；VwFor mole of water flooding
Volume, Vw=150mL/mol；ω=0.68；ρ is stratum water density, kg/m3；G is acceleration of gravity, value 9.8N/kg；H is
Buried depth of strata, m.
7. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 6, which is characterized in that described
Residual compression inside reservoir is mainly related with formation temperature, molal volume, buried depth of strata, the variation of molal volume mainly by
During oil generation caused by the variation of component, formation temperature Temporal Evolution history and buried depth of strata Temporal Evolution history are utilized
Then residual compression evolution quantitative expression inside available reservoir, Fluid pressure inside reservoir with stratum temperature change pass
It is formula are as follows:
PF=f (T)=f'(t)
Wherein, T is formation temperature, k；T is time, Ma；
Buried depth of strata can be determined as the function of time, therefore the evolutionary process of hydrostatic pressure by basin modelling method are as follows:
PW=f " (t)；
The functional relation of residual compression and time inside reservoir are as follows:
PR=PF-PW=f'(t)-f " (t).
8. the determination method of the crude oil filling pore throat lower limit of compact reservoir according to claim 7, which is characterized in that fine and close
Crude oil inside reservoir fills pore throat lower limit are as follows:
Wherein, dRPore throat lower limit is filled for the crude oil inside reservoir, m is generally converted to nm；rRFor the crude oil filling inside reservoir
Pore throat radius, m are generally converted to nm.
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| CN111075443A (en) * | 2019-12-31 | 2020-04-28 | 成都理工大学 | Natural gas filling semi-quantitative measuring system and method suitable for low-abundance gas reservoir |
| CN113759099A (en) * | 2021-09-07 | 2021-12-07 | 重庆科技学院 | Quantitative evaluation method for oil-gas filling capacity of source-storage-side-connected oil-gas reservoir |
| CN117826247A (en) * | 2024-01-06 | 2024-04-05 | 中国地质科学院地质力学研究所 | Carbonate rock oil-gas reservoir geological process reconstruction method |
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| CN111075443A (en) * | 2019-12-31 | 2020-04-28 | 成都理工大学 | Natural gas filling semi-quantitative measuring system and method suitable for low-abundance gas reservoir |
| CN111075443B (en) * | 2019-12-31 | 2021-08-27 | 成都理工大学 | Natural gas filling semi-quantitative measuring system and method suitable for low-abundance gas reservoir |
| CN113759099A (en) * | 2021-09-07 | 2021-12-07 | 重庆科技学院 | Quantitative evaluation method for oil-gas filling capacity of source-storage-side-connected oil-gas reservoir |
| CN117826247A (en) * | 2024-01-06 | 2024-04-05 | 中国地质科学院地质力学研究所 | Carbonate rock oil-gas reservoir geological process reconstruction method |
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