CN103900942A - Method for continuously characterizing microscopic pore throat parameters of reservoir based on high-pressure mercury injection analysis - Google Patents
Method for continuously characterizing microscopic pore throat parameters of reservoir based on high-pressure mercury injection analysis Download PDFInfo
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Abstract
The invention relates to the field of exploration and development of petroleum and natural gas and in particular relates to a method for continuously characterizing microscopic pore throat parameters of a reservoir based on high-pressure mercury injection analysis. On the basis of the high-pressure mercury injection, a method for quantitatively characterizing the microscopic pore throat structure parameters by using macroscopic physical parameters of the reservoir is established. The method has the advantage that as long as the macroscopic physical parameters and deposition micro phases of one reservoir are known, the method can be used for determining distribution characteristics of the microscopic pore throat structure parameters of the reservoir and continuously characterizing the distribution characteristics of the microscopic pore throat structure parameters of the reservoir.
Description
Technical field
The present invention relates to oil and gas exploration and development field, particularly a kind of continuous characterizing method of the reservoir micro throat parameter of analyzing based on high-pressure mercury.
Background technology
Reservoir micro throat structure refers to hole that rock has and geometric configuration, the size of venturi, the relation that distributes and be interconnected.Because oil, gas, water are to flow in the hole being communicated with at reservoir rock, therefore pore structure characteristic has important impact to fluid mobile in hole.Particularly for low permeability reservoir, its hole is tiny, pore constriction differs greatly, complex structure, distribution nonuniformity are stronger, cause that this type of reservoir water injection pressure is high, development effectiveness is poor, waterflood efficiency is low etc., in order better to develop this type of reservoir, just need to carry out more deep research to its micro throat structure.
High-pressure mercury (it is 116MPa that maximum is entered mercury pressure) is Study In Reservoir microcosmic technical method the most widely at present, by inject mercury obtains enter mercury capillary pressure curve and exit the mercury ejection curve that mercury process obtains in rock, can obtain the series of parameters that can reflect Pore throat size, pore throat sorting, pore throat connectedness and percolation ability.But because mercury in high-pressure mercury experiment has pollution to environment, and testing expenses are higher, and can only, for indivedual rock core experiment Analysis, can not realize the continuous sign of reservoir mesopore Adam's apple structure.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of characterizing method of the reservoir micro throat parameter of analyzing based on high-pressure mercury is provided.
Between pore throat structure on reservoir physical parameter and microcosmic in macroscopic view, exist contact essence, inevitable, in macroscopic view, the difference of physical parameter is exactly because the difference of pore throat structure on microcosmic is caused, so macroscopic properties parameter is easy to obtain and continuous distribution.
Technical scheme of the present invention is:
The present invention obtains on the basis of reservoir macroscopic properties parameter and micro throat structural parameters in high-pressure mercury technology, according to the correlation analysis of macroscopic properties parameter and micro throat structural parameters, utilize macroscopic properties parameter quantification to characterize micro throat structural parameters, concrete grammar is as follows:
The first, detect broad perspectives parameter by rock detector, press mercury experimental calculation pore throat structural parameters by rock core; Obtain rock porosity by rock porosity detector; Obtain rock permeability by rock permeability detector;
The second, press in study area actual high-voltage on the basis of mercury data, to macroscopic properties parameter, as factor of porosity Φ, permeability K, reservoir qualitative index R
qI(R
qI=(K/ Φ)
0.5) etc. with micro throat structural parameters, as largest connected pore throat radius R d, saturation degree median radius Rc50, average pore throat radius R m, mean square deviation S etc. carry out relevance function matching, choose the macroscopical value parameter of the best bulk parameter of both correlativitys as micro throat structure.
The 3rd, determine the invalid pore throat rank of low permeability reservoir.Press mercury data according to actual high-voltage, the contribution feature in conjunction with different stage pore throat to permeability, determines the pore throat rank to the essentially no contribution of permeability, and the hole that the venturi that is less than this pore throat rank is controlled and venturi volume are decided to be invalid pore throat.
The 4th, utilize macroscopic properties parameter to the basis of micro throat structural parameters classification on, in conjunction with the different sedimentary facies belts and the invalid pore throat application model of sedimentary micro that are based upon on statistical basis, determine the macro-level quantitative characterization model of reservoir micro throat structural parameters.
The invention has the beneficial effects as follows:
The present invention is on the basis of high-pressure mercury, set up the method for utilizing reservoir macroscopic properties parameter quantification to characterize micro throat structural parameters, as long as advantage is to know macroscopic properties parameter and the sedimentary micro thereof of a certain reservoir, just can utilize method of the present invention to determine the distribution characteristics of its micro throat structural parameters, and the distribution characteristics of the micro throat parameter of continuous characterize reservoir.
Brief description of the drawings
Fig. 1 is techniqueflow chart of the present invention;
Fig. 2 is that the somewhere of the embodiment of the present invention is removed hole before and after invalid pore throat and oozed and be related to comparison diagram;
Fig. 3 is the invalid pore throat content statistical analysis figure of the different sedimentary facies in the somewhere of the embodiment of the present invention and microfacies;
Fig. 4 is the R of the different invalid pore throat content in somewhere of the embodiment of the present invention
qI(R
qI<0.1) with micro throat parameter-relation chart;
Fig. 5 is the R of the different invalid pore throat content in somewhere
qI(0.1≤R
qI<0.3) with micro throat parameter-relation chart;
The R of the different invalid pore throat content in Fig. 6 somewhere
qI(0.3≤R
qI<2) with micro throat parameter-relation chart.
Embodiment
The specific embodiment of the present invention is as follows:
The concrete technical scheme of this invention is described as an example of the macro-level quantitative characterizing method of Shengli Oil Field somewhere micro throat structural parameters example:
The first, detect broad perspectives parameter by rock detector, press mercury experimental calculation pore throat structural parameters by rock core; Wherein conventional core analysis (rock porosity, permeability determination), detects foundation: " rock core conventional method of analysis " SY/T5336-2006.Test condition, temperature: normal temperature; Humidity: often wet factor of porosity detecting instrument: 3020-62 helium porosity measuring instrument; Permeability detecting instrument: GDS-9F gas permeability detector; Rock capillary pressure curve is measured (mercury intrusion method), detects foundation: rock capillary pressure curve is measured " SY/T5346-2005.Test condition, temperature: 22 DEG C; Humidity: 60%; Mercury intrusion method detecting instrument: 9505 type mercury injection apparatuses
The second, adopt function-fitting method, determine funtcional relationship and degree of fitting between each macroscopic properties parameter and micro throat structural parameters, and choose wherein best with micro throat structural parameters correlativity reservoir qualitative index R
qIas macroscopical value parameter of micro throat structure, reservoir qualitative index R
qIas shown in table 1 with the correlativity of each micro-parameter.
Table 1 somewhere reservoir qualitative index R
qIwith micro throat structural parameters funtcional relationship
The 3rd, utilize high-pressure mercury data, determine the contribution of different stage Pore throat size to permeability, by to the essentially no contribution of permeability≤hole and venturi volume that the venturi of 0.1 μ m is controlled be decided to be invalid pore throat, after the factor of porosity of controlling at the venturi of removing≤0.1 μ m, the reservoir hole relation of oozing obviously improves (Fig. 2), although illustrate in low permeability reservoir≤0.1 μ m pore throat radius is being controlled larger pore throat volume, this part pore throat to oil and gas flow substantially without contribution.
The 4th, draw reservoir qualitative index R
qIcumulative percentage content distribution figure, micro throat structure is divided three classes, I class reservoir qualitative index R
qI>=0.3, II class reservoir qualitative index 0.1≤R
qI<0.3, III class reservoir qualitative index R
qI<0.1.By invalid pore throat content W be divided into 4 ranks (W<25%, 25%≤W<50%, 50%≤W<75%,, W >=75%) and the invalid pore throat content of different sedimentary micro is carried out to statistical analysis, draw invalid pore throat content application model.
In conjunction with the macroscopic properties classification of micro throat structure and invalid pore throat content macroscopic view application model, realize the macro-level quantitative of micro throat structural parameters is characterized to (as shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6).
Fig. 3 illustrates that different sedimentary micro have certain control action for the content of invalid pore throat, different primary deposit conditional decisions in reservoir Pore throat size form in the evolution in earth history period.
Fig. 4, Fig. 5 and Fig. 6 refer to the content that considers invalid pore throat on pore throat structure rating basis, thereby to the quantitatively characterizing that in reservoir, pore throat parameter is carried out, instruction is in a certain study area, as long as determined its sedimentary micro, and utilizing on the basis of bulk parameter classification, can reach quantitatively characterizing and prediction to micro-parameter.
Claims (3)
1. a continuous characterizing method for the reservoir micro throat parameter of analyzing based on high-pressure mercury, is characterized in that, comprising:
Step 1): detect broad perspectives parameter by rock detector, press mercury experimental calculation pore throat structural parameters by rock core;
Step 2): adopt function-fitting method, determine funtcional relationship and degree of fitting between each macroscopic properties parameter and micro throat structural parameters, choose the best bulk parameter of both correlativitys as micro throat structure macroscopic view value parameter;
Step 3): press mercury data according to actual high-voltage, the contribution feature in conjunction with different stage pore throat to permeability, determines the invalid pore throat rank of low permeability reservoir, hole and venturi volume that the venturi that is less than described pore throat rank is controlled are decided to be invalid pore throat;
Step 4): in step 1) and 2) basis on, determine the macro-level quantitative characterization model of reservoir micro throat structural parameters.
2. the continuous characterizing method of the reservoir micro throat parameter of analyzing based on high-pressure mercury according to claim 1, is characterized in that, described broad perspectives parameter comprises factor of porosity Φ, permeability K, reservoir qualitative index R
qI.
3. the continuous characterizing method of the reservoir micro throat parameter of analyzing based on high-pressure mercury according to claim 1, it is characterized in that, described micro throat structural parameters comprise largest connected pore throat radius R d, saturation degree median radius Rc50, average pore throat radius R m, mean square deviation S.
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| CN105136643A (en) * | 2015-08-25 | 2015-12-09 | 成都理工大学 | Uniflow Hg-injection system under effective overburden pressure and realization method thereof |
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| CN106198345A (en) * | 2016-07-05 | 2016-12-07 | 西北大学 | Reservoir evaluation method |
| CN106525684A (en) * | 2016-10-27 | 2017-03-22 | 中国石油大学(北京) | Method for correcting Klinkenberg permeability of tight sandstones based on pore-throat structures |
| CN106526079A (en) * | 2016-10-27 | 2017-03-22 | 中国石油大学(北京) | Method used for studying tight sandstone pore-throat structure dynamic change |
| CN107038461A (en) * | 2017-04-10 | 2017-08-11 | 中国石油天然气股份有限公司 | Method and device for judging high-pressure mercury injection loss |
| CN107228934A (en) * | 2017-06-27 | 2017-10-03 | 中国石油大学(华东) | The determination method of tight sand hydrocarbon charge pore throat radius lower limit |
| CN108088779A (en) * | 2017-12-27 | 2018-05-29 | 中国石油大学(华东) | A kind of compact reservoir and conventional reservoir reservoir space sorting technique |
| CN108204936A (en) * | 2016-12-16 | 2018-06-26 | 中国石油化工股份有限公司 | The characterizing method of compact reservoir micropore structure |
| CN109632594A (en) * | 2017-10-27 | 2019-04-16 | 东北石油大学 | A method of based on high-pressure mercury Multi-scale characterization compact reservoir pore throat characteristic |
| CN110222981A (en) * | 2019-06-05 | 2019-09-10 | 中国石油大港油田勘探开发研究院 | A kind of reservoir classification evaluation method based on the secondary selection of parameter |
| CN110826016A (en) * | 2019-11-04 | 2020-02-21 | 中国石油天然气股份有限公司 | Saturation and free water surface calculation and prediction method based on microscopic heterogeneity representation |
| CN111398116A (en) * | 2020-03-04 | 2020-07-10 | 中国地质大学（武汉） | Method for representing shale anisotropy by mercury porosimetry in specific direction |
| CN111693425A (en) * | 2019-03-14 | 2020-09-22 | 中国石油大学(北京) | Rock core film bound water saturation determination method based on mercury intrusion curve |
| CN112326523A (en) * | 2020-09-18 | 2021-02-05 | 中国石油天然气股份有限公司 | Method and device for acquiring pore throat characteristic parameters, computer equipment and storage medium |
| CN112966455A (en) * | 2021-05-18 | 2021-06-15 | 西南石油大学 | Method for establishing low-permeability sandstone pore network model based on conventional mercury intrusion data |
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| CN105628580A (en) * | 2015-12-21 | 2016-06-01 | 中国石油大学(华东) | Reservoir false crack identification and physical property correction method |
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