CN107701180B - Original oil reservoir water saturation calculation method based on closed coring - Google Patents
Original oil reservoir water saturation calculation method based on closed coring Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000004364 calculation method Methods 0.000 title claims abstract description 30
- 230000035699 permeability Effects 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000004458 analytical method Methods 0.000 claims abstract description 22
- 238000002474 experimental method Methods 0.000 claims abstract description 20
- 239000011435 rock Substances 0.000 claims abstract description 6
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- 238000011160 research Methods 0.000 claims abstract description 5
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Abstract
The invention discloses a method for calculating the water saturation of an original oil reservoir based on closed coring, which comprises the following steps: obtaining parameters of porosity, permeability and saturation of the core through experimental analysis by utilizing the existing closed core-taking well of the block; combining block well logging and oil testing data to determine an original oil-water interface of an oil reservoir in a research area; constructing an original oil reservoir water saturation calculation model, and determining coefficients in the model by a least square method in combination with rock physical experiment analysis data; establishing a porosity and permeability calculation model by a least square method by using the porosity and permeability analyzed by a core experiment and combining a logging curve; the method is characterized in that the original water saturation of the oil reservoir is calculated through logging information by utilizing a porosity and permeability model, a determined original oil-water interface and an original water saturation calculation model in a new well.
Description
Technical Field
The invention belongs to the technical field of logging evaluation of fluid properties of reservoirs of complex oil and gas reservoirs in petroleum exploration, and relates to a calculation method of water saturation of an original oil reservoir based on closed coring.
Background
The capillary pressure curve is one of the main methods for evaluating the original oil saturation of a reservoir, a limited core is selected for a target interval to carry out a mercury injection experiment, capillary pressure data are classified by adopting a J function method or a flow unit analysis method to obtain average capillary pressure curves of the same type, and the original oil saturation of an oil reservoir is obtained by utilizing the average capillary pressure curves; or establishing a function model between the mercury inlet saturation and the sandstone permeability under different mercury inlet pressures, constructing and fitting the whole reservoir capillary pressure curve point by point, and evaluating the original oil saturation of the reservoir point by using the constructed capillary pressure curve. In addition, the original water saturation of the oil reservoir is calculated on the basis of an oil-water seepage theory by adopting a method of combining experimental data and production data through rock physics experiments to obtain the phase seepage data. Other methods for obtaining the original water saturation of the reservoir stratum are that the saturation of a single sample is obtained by well wall coring or closed coring and an experimental test process, and the original oil reservoir water saturation of the reservoir stratum cannot be continuously calculated. Meanwhile, the method for determining the original water saturation of the oil reservoir through the mercury intrusion experiment is an indirect method, and the calculation accuracy is relatively low.
According to the reservoir formation characteristics of the oil reservoir, the height of an oil column reflecting the displacement pressure of the oil reservoir in the reservoir formation process is introduced when an original water saturation calculation model is constructed; secondly, introducing pore structure characteristic parameters capable of reflecting the displacement pressure of the reservoir
And finally introducing porosity reflecting the size of a reservoir space of the reservoir. The original water saturation calculation model directly scales by using the water saturation measured by the closed coring experiment, so that the calculation accuracy of the model is higher.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for calculating the water saturation of the original oil reservoir based on closed coring.
The invention is realized by the following technical scheme.
A method for calculating the water saturation of an original oil reservoir based on closed coring comprises the following steps:
102, determining an original oil-water interface of an oil reservoir in a research area by combining the logging and oil testing data of the block;
103, constructing an original oil reservoir water saturation calculation model, and determining coefficients in the model by a least square method by combining rock physical experiment analysis data;
104, establishing a porosity and permeability calculation model by a least square method by using the porosity and permeability analyzed by the core experiment and combining a logging curve;
and 105, calculating the original water saturation of the oil reservoir through the logging data of the block by utilizing the porosity, the permeability model, the original water saturation calculation model and the determined original oil-water interface of the oil reservoir.
Further, in the step 101, the porosity, permeability and saturation parameters of the core are obtained through core experiment analysis by using the existing closed core-taking well of the block.
Furthermore, the core experiment analysis is carried out according to the flow specified in the standard of core analysis method SY/T5336-charge 2006.
Further, the step 103 constructs a reservoir original water saturation calculation model as follows:
in the formula: sWYThe reservoir original oil reservoir water saturation is obtained; DEP is the current logging depth of the reservoir; OWL is the original oil-water interface of the oil reservoir; k is reservoir permeability; POR is reservoir porosity; a. b, c and d are coefficients in the model formula.
Further, the coefficients a, b, c, d in the model formula (1) are obtained by least squares fitting using the porosity, permeability and saturation of closed core analysis.
Further, in step 104, the porosity and permeability calculation model is established as follows:
POR＝a1×DEN+b1(2)
in the formula: k is reservoir permeability; POR is reservoir porosity; DEN is a density log value; Δ GR is the natural gamma relative value; GR is a natural gamma log value; GRminThe natural gamma logging value is pure sandstone; GRmaxThe natural gamma log value of the pure mudstone section is obtained; a is1、b1、a2、b2、c2The coefficient is obtained by performing least square fitting on the analysis data and the logging data of a closed coring core experiment, wherein the coefficient is a coefficient in a model formula.
The method has the advantages that the original oil reservoir water saturation calculation model is established on the basis of analyzing the saturation in the closed coring core experiment, the original reservoir water saturation is obtained through logging information, the method for determining the saturation without reservoir resistivity is provided, logging explanation can be guided, and reservoir fluid property identification can be carried out.
Drawings
FIG. 1 is a flow chart of a method for calculating water saturation of an original oil reservoir based on closed core extraction according to the present invention;
FIG. 2 is a diagram of the XX11 well reservoir original oil-water interface determination provided in the embodiment of the present invention;
FIG. 3 is a validation graph of the results of the original water saturation calculations provided in an embodiment of the present invention;
fig. 4 is a diagram of the calculation result of the original water saturation of the flooding layer provided in the embodiment of the present invention.
Detailed Description
The following detailed description is provided to support the technical problems to be solved by the present invention, but not to limit the invention.
As shown in fig. 1, a method for calculating water saturation of an original oil reservoir based on closure coring according to an embodiment of the present invention includes the following steps:
step 101: firstly, obtaining parameters of porosity, permeability and saturation of a rock core through experimental analysis by utilizing an existing closed core-taking well of a block;
step 102: combining the logging and oil testing data of the block to determine the original oil-water interface of the reservoir in the research area;
step 103: constructing an original oil reservoir water saturation calculation model, and determining coefficients in the model by a least square method in combination with rock physical experiment analysis data;
step 104: establishing a porosity and permeability calculation model by a least square method by using the porosity and permeability analyzed by a core experiment and combining a logging curve;
step 105: and calculating the original water saturation of the oil reservoir through the logging data of the block by utilizing the porosity, the permeability model, the original water saturation calculation model and the determined original oil-water interface of the oil reservoir.
In support of the technical problem to be solved by the present invention, the following steps are performed by further describing the specific implementation of the present embodiment:
firstly, selecting a well XX1-6-9 which is used for continuously and hermetically coring from top to bottom in a selected area, selecting cores with different coring depths and different particle sizes, carrying out measurement on the porosity, permeability and water saturation of the core according to standard regulation of a core analysis method SY/T5345-2007, and obtaining the porosity, permeability and water saturation of the core under different depth changes so as to prepare data for subsequent modeling.
And step two, comprehensively determining the original oil-water interface of the reservoir in the research area to be 5827m by combining XX11 well logging and oil testing data of the block, as shown in figure 2.
And step three, obtaining coefficients a, b, c and d in a model formula (1) by using the porosity, permeability and saturation of the closed coring core analysis in the step one through least square fitting, and determining an original water saturation calculation model of the oil reservoir as follows:
in the formula: sWYThe reservoir original oil reservoir water saturation is obtained; DEP is the current logging depth of the reservoir; OWL is the original oil-water interface of the oil reservoir; k is reservoir permeability; POR is reservoir porosity; a. and b, c and d are coefficients in a model formula, and the coefficients a, b, c and d are obtained by least square fitting by utilizing the porosity, permeability and saturation of closed coring core analysis.
And step four, determining a porosity and permeability calculation model by using the porosity and permeability analyzed by the core experiment in the step one and combining a logging curve through least square fitting as follows:
POR＝71.43×DEN+147.86 (2)
K＝10-2.42×POR2.34/ΔGR1.12(3)
in the formula: k is reservoir permeability; POR is reservoir porosity; DEN is a density log value; Δ GR is the natural gamma relative value; GR is a natural gamma log value; GRminThe natural gamma logging value is pure sandstone; GRmaxThe natural gamma log value of the pure mudstone section is obtained.
Calculating the porosity and the permeability of the reservoir by density logging and gamma logging and by using the porosity and permeability models determined by the formulas (2), (3) and (4) in the fourth step; on the basis of reservoir porosity and permeability calculation, an original oil-water interface is determined in the second step, and the original water saturation of the reservoir changing along with the depth is obtained point by point through an original water saturation calculation model determined in the third step (1), as shown in fig. 3 and 4.
FIG. 3 is a calculation result of water saturation of an original oil reservoir of a well, which is obtained by the method, wherein the calculated water saturation of the original oil reservoir is basically consistent with the result of the closed coring analysis, and the reliability of the method is verified; FIG. 4 shows the application of the method in a new well, by comparing the original oil reservoir water saturation with the calculated water saturation at present, the water flooded layer can be effectively identified, and the interpretation and evaluation of logging information can be guided.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A method for calculating the water saturation of an original oil reservoir based on closed coring is characterized by comprising the following steps:
step 101, firstly, utilizing the existing closed core-taking well of a block to obtain the porosity, permeability and saturation parameters of a core through experimental analysis;
102, determining an original oil-water interface of an oil reservoir in a research area by combining the logging and oil testing data of the block;
103, constructing an original oil reservoir water saturation calculation model, and determining coefficients in the model by a least square method by combining rock physical experiment analysis data;
104, establishing a porosity and permeability calculation model by a least square method by using the porosity and permeability analyzed by the core experiment and combining a logging curve;
105, calculating the original water saturation of the oil reservoir through the logging data of the block by utilizing the porosity, the permeability model, the original water saturation calculation model and the determined original oil-water interface of the oil reservoir;
in step 103, a model for calculating the original water saturation of the oil reservoir is constructed as follows:
in the formula: sWYThe reservoir original oil reservoir water saturation is obtained; DEP is the current logging depth of the reservoir; OWL is the original oil-water interface of the oil reservoir; k is reservoir permeability; POR is reservoir porosity; a. b, c and d are coefficients in a model formula; coefficients a, b, c and d in the model formula are obtained by least square fitting according to the porosity, permeability and saturation of closed coring core analysis.
2. The method for calculating the original reservoir water saturation based on closed core extraction as claimed in claim 1, wherein in the step 101, the porosity, permeability and saturation parameters of the core are obtained through core experiment analysis by using the existing closed core extraction wells of the block.
3. The method for calculating the original reservoir water saturation based on closed coring as claimed in claim 2, wherein the core experiment is performed according to the standard flow of core analysis method SY/T5336-one 2006.
4. The method for calculating the water saturation of an original reservoir based on closed core as claimed in claim 1, wherein in the step 104, the porosity and permeability calculation model is established as follows:
POR＝a1×DEN+b1(2)
in the formula: k is reservoir permeability; POR is reservoir porosity; DEN is a density log value; Δ GR is the natural gamma relative value; GR is a natural gamma log value; GRminThe natural gamma logging value is pure sandstone; GRmaxThe natural gamma log value of the pure mudstone section is obtained; a is1、b1、a2、b2、c2The coefficient is obtained by performing least square fitting on the analysis data and the logging data of a closed coring core experiment, wherein the coefficient is a coefficient in a model formula.
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| CN109753755B (en) * | 2019-01-25 | 2023-12-01 | 中国石油天然气集团有限公司 | Method for determining water saturation of reservoir |
| CN110056346B (en) * | 2019-04-17 | 2022-05-17 | 中国石油天然气股份有限公司 | Oil reservoir three-dimensional original water saturation simulation method based on trend change function |
| CN112100788B (en) * | 2019-05-28 | 2023-06-27 | 中国石油大学(北京) | Dynamic analysis method and device for reservoir water flooding development and readable storage medium |
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| CN110414085B (en) * | 2019-07-09 | 2022-10-14 | 中国石油化工股份有限公司 | Method for determining original oil-water interface of developed fault block oil reservoir |
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| CN112392464A (en) * | 2020-12-11 | 2021-02-23 | 中国石油天然气集团有限公司 | Method for calculating reservoir water production rate based on conventional logging information |
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| CN101649738A (en) * | 2008-08-13 | 2010-02-17 | 中国石油天然气集团公司 | Method for determining stratum water saturation |
| CN103422853B (en) * | 2012-05-24 | 2016-10-26 | 中国石油天然气集团公司 | A kind of method and device determining stratum water saturation |
| CN104101562B (en) * | 2013-04-15 | 2017-02-08 | 中国石油天然气集团公司 | Method for determining reservoir permeability |
| CN105301220B (en) * | 2014-06-06 | 2017-07-07 | 中国石油化工股份有限公司 | Sealing core drilling analyzes the bearing calibration of saturation degree |
| CN104569350B (en) * | 2015-01-19 | 2016-03-23 | 西南石油大学 | The method of testing of the original water saturation of the irregular full diameter rock sample of sealed coring |
| CN106153854A (en) * | 2015-03-30 | 2016-11-23 | 中国石油化工股份有限公司 | sealed coring well saturation correction method |
| CN106204302B (en) * | 2016-07-05 | 2019-09-10 | 中国石油天然气股份有限公司 | Method for calculating original water saturation and application |
| CN106771071B (en) * | 2016-12-26 | 2019-07-05 | 中国石油天然气集团公司 | A kind of sealing core drilling saturation correction method mutually seeped based on grease |
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