CN111505238A - Rock cloudization computing method and computing system - Google Patents
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Abstract
The invention discloses a rock clouding computing method and a computing system, comprising the following steps: obtaining the relative proportion of calcium and magnesium elements in the rock; obtaining the content of inorganic carbon in the rock; calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon; the degree of dolomisation of the rock was calculated based on the percentage contents of calcite and dolomite. According to the rock clouding calculation method and the rock clouding calculation system, the percentage content of calcite and the percentage content of dolomite in the rock are calculated according to the carbon material balance method, so that the rock clouding quantitative calculation is realized, and the rock clouding degree is calculated conveniently, quickly and accurately.
Description
Technical Field
The invention belongs to the field of oil-gas exploration and development, and particularly relates to a rock clouding calculation method and a rock clouding calculation system.
Background
Dolomites have received much attention as a very important hydrocarbon reservoir and have been a research hotspot for many years. In recent years, with the exploration and development of shale oil, research on the dolomization of rocks (content of dolomite and calcite) in shale has been receiving attention. Research shows that the dolomization process has direct influence on reservoir pores, the cross-substitution effect of the dolomization process plays an important construction role in the formation of the pores and the improvement of reservoir permeability, and on the other hand, the dolomitic rock formed after dolomization influences the evaluation of the compressibility of the shale oil and gas reservoir due to the increase of the brittleness of the dolomitic rock.
At present, the following three methods are mainly used for the quantitative calculation of the dolomization of the rock: (1) the dolomite is treated as ideal dolomite, the relative mass fraction of the calcite and the dolomite in the dolomite rock sample is calculated through the mass fraction of CaO and MgO, and then the degree of the dolomite of the rock is calculated, but because the X-ray diffraction analysis and the X-ray fluorescence spectroscopy analysis depend on the explanation processing of data results, a reasonable and appropriate calibration lithology card needs to be manually selected to obtain a correct test result (for example, the difference of the clay mineral content processing methods can cause other ore mineral content processing methods)The test result of the object has larger deviation), the test result is relatively dependent on the test level and experience of the tester, and the data result processed by different experimenters may have larger deviation. Thus the method is applied to Ca2+And Mg2+The reliability of the measured relative value is high, and the reliability of the absolute value of the dolomite content is not high. (2) The rock sample is decomposed by using a mixed flux of sodium hydroxide and potassium hydroxide, the content of calcium oxide is measured by using an acid-base titration method, the content of magnesium oxide is obtained by using a subtraction method, and then the relative content of calcite and dolomite in the rock sample is calculated to carry out dolomization quantitative calculation (Xiapenem 2013; patent CN103528912A and the like). (3) Patent CN107402411A discloses a method for calculating dolomite content by intersection fitting of identification parameters such as permeability and porosity in logging information (or logging data) and dolomite content and by identifying the parameters, in the method, the dolomite content is solved by a joint equation set, a large number of empirical parameters in the joint equation set need to be determined manually, and the quality of parameter selection can significantly affect the calculation result. Therefore, the solution results obtained by using the joint equation system are not accurate enough.
The accurate calculation of the dolomization degree of the rock is beneficial to evaluating the compressibility of the rock and supporting the development and evaluation of the current unconventional shale oil; meanwhile, the judgment of the dolomization degree of the rock is also helpful for distinguishing land source debris from chemical deposition and predicting the development scale of the hydrocarbon source rock. Therefore, a convenient and accurate rock clouding calculation method is particularly needed.
Disclosure of Invention
The invention aims to conveniently, quickly and accurately calculate the dolomization quantification of the rock.
In order to achieve the above object, the present invention provides a rock clouding calculation method, including: obtaining the relative proportion of calcium and magnesium elements in the rock; obtaining the content of inorganic carbon in the rock; calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon; calculating the degree of rock clouding based on the calcite and dolomite percentage contents.
Preferably, the carbon material balance formula is as follows:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaCO)3) Is CaCO3Mass fraction of (a), ωDolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock.
Preferably, the percent content of calcite and the percent content of dolomite are calculated by using the formula (3) and the formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element.
Preferably, the relative proportion of calcium and magnesium elements in the rock is determined by an X-ray fluorescence spectrometer.
Preferably, the inorganic carbon content of the rock is determined by a rock pyrolyser.
According to another aspect of the invention, there is provided a rock clouding computing system, the system comprising: a memory storing computer-executable instructions; a processor executing computer executable instructions in the memory to perform the steps of: obtaining the relative proportion of calcium and magnesium elements in the rock; obtaining the content of inorganic carbon in the rock; calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon; calculating the degree of rock clouding based on the calcite and dolomite percentage contents.
Preferably, the carbon material balance formula is as follows:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaCO)3) Is CaCO3Mass fraction of (a), ωDolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock.
Preferably, the percent content of calcite and the percent content of dolomite are calculated by using the formula (3) and the formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element.
Preferably, the rock clouding computing system further comprises an X-ray fluorescence spectrometer for measuring the relative proportion of calcium and magnesium elements in the rock.
Preferably, the rock clouding computing system further comprises a rock pyrolyser for determining the inorganic carbon content in the rock.
The invention has the beneficial effects that: according to the rock clouding calculation method and the rock clouding calculation system, the relative proportions of inorganic carbon content and calcium and magnesium in the rock are obtained, and according to the carbon material balance method, the percentage content of calcite and the percentage content of dolomite in the rock are calculated, so that the rock clouding quantitative calculation is realized, and the rock clouding degree is calculated conveniently, quickly and accurately.
The present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a flow diagram of a rock clouding calculation method according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The rock clouding computing method comprises the following steps: obtaining the relative proportion of calcium and magnesium elements in the rock; obtaining the content of inorganic carbon in the rock; calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon; the degree of dolomisation of the rock was calculated based on the percentage contents of calcite and dolomite.
Specifically, the relative proportion of calcium and magnesium elements and the content of inorganic carbon in the rock are obtained, based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon, according to a carbon material balance formula, the percentage content of calcite and the percentage content of dolomite are calculated, and then the dolomization degree of the rock is calculated, wherein the ratio of the percentage content of dolomite to the percentage content of calcite is the dolomization degree of the rock.
According to the rock clouding calculation method of the exemplary embodiment, according to the carbon material balance method, the percentage content of calcite and the percentage content of dolomite in the rock are calculated, so that quantitative calculation of the rock clouding is achieved, and the rock clouding degree is calculated conveniently, quickly and accurately.
Preferably, the carbon material balance formula is as follows:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaCO)3) Is CaCO3Mass fraction of (a), ωDolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock.
In particular, the sum of the C content in calcite and the C content in dolomite equals the total C content of the rock, where M (CaCO)3)＝100，M(MgCa(CO3)2)＝184，M(C)＝12，M(Mg)＝24。
Preferably, the percentage content of calcite and the percentage content of dolomite are calculated by adopting a formula (3) and a formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element.
Specifically, the relative proportion of calcium and magnesium elements in the rock is obtained, the formula (2) is adopted to calculate the relative proportion of calcium and magnesium elements in the rock,
magnesium in dolomite/calcium in calcite + calcium in dolomite ═ magnesium element/calcium element, where M (CaCO)3)＝100，M(MgCa(CO3)2)＝184，M(Ca)＝40，M(Mg)＝24。
Equations (3) and (4) are derived from equations (1) and (2), and the percentage contents of calcite and dolomite are calculated by equations (3) and (4).
Preferably, the relative proportion of calcium and magnesium elements in the rock is measured by an X-ray fluorescence spectrometer.
Preferably, the content of the inorganic carbon in the rock is measured by a rock pyrolysis instrument.
The rock clouding computing system according to the present invention comprises: a memory storing computer-executable instructions; a processor executing computer executable instructions in the memory to perform the steps of: obtaining the relative proportion of calcium and magnesium elements in the rock; obtaining the content of inorganic carbon in the rock; calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon; the degree of dolomisation of the rock was calculated based on the percentage contents of calcite and dolomite.
Specifically, the relative proportion of calcium and magnesium elements and the content of inorganic carbon in the rock are obtained, based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon, according to a carbon material balance formula, the percentage content of calcite and the percentage content of dolomite are calculated, and then the dolomization degree of the rock is calculated, wherein the ratio of the percentage content of dolomite to the percentage content of calcite is the dolomization degree of the rock.
According to the rock clouding system method of the exemplary embodiment, according to the carbon material balance method, the percentage content of calcite and the percentage content of dolomite in the rock are calculated, so that quantitative calculation of the rock clouding is achieved, and the rock clouding degree is calculated conveniently, quickly and accurately.
Preferably, the carbon material balance formula is as follows:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaCO)3) Is CaCO3Mass fraction of (a), ωDolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock.
In particular, the sum of the C content in calcite and the C content in dolomite equals the total C content of the rock, where M (CaCO)3)＝100，M(MgCa(CO3)2)＝184，M(C)＝12，M(Mg)＝24。
Preferably, the percentage content of calcite and the percentage content of dolomite are calculated by adopting a formula (3) and a formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element.
Specifically, the relative proportion of calcium and magnesium elements in the rock is obtained, the formula (2) is adopted to calculate the relative proportion of calcium and magnesium elements in the rock,
magnesium in dolomite/calcium in calcite + calcium in dolomite ═ magnesium element/calcium element, where M (CaCO)3)＝100，M(MgCa(CO3)2)＝184，M(Ca)＝40，M(Mg)＝24。
Equations (3) and (4) are derived from equations (1) and (2), and the percentage contents of calcite and dolomite are calculated by equations (3) and (4).
Preferably, the rock clouding computing system further comprises an X-ray fluorescence spectrometer for measuring the relative proportion of calcium and magnesium elements in the rock.
Preferably, the rock clouding computing system further comprises a rock pyrolysis instrument for determining the content of inorganic carbon in the rock.
Examples
Fig. 1 shows a flow diagram of a rock clouding calculation method according to an embodiment of the present invention.
As shown in fig. 1, the rock clouding computing method includes:
s102: obtaining the relative proportion of calcium and magnesium elements in the rock;
wherein, the relative proportion of calcium and magnesium elements in the rock is measured by an X-ray fluorescence spectrometer;
selecting 40 samples of a rock core with three sections of 9 meters, covering argillaceous dolomite, dolomite argillaceous shale and other lithology, of a cave depression A well in a basin in the Jianghan, utilizing a handheld X-ray fluorescence spectrometer, for example, a Bruker S1Titan handheld X-ray fluorescence spectrometer, wherein the acquisition mode is a two-section geochemical mode, the acquisition time is 60 seconds, performing element scanning on the rock core sample to obtain the element proportion of magnesium oxide and calcium oxide, and then performing result calculation on the calcium-magnesium element proportion, wherein the calculation result is shown in an attached table 1;
s104: obtaining the content of inorganic carbon in the rock;
wherein, the content of inorganic carbon in the rock is measured by a rock pyrolysis instrument;
measuring the content of carbonate carbon in the rock by using a rock pyrolysis instrument, for example, using an HAWK rock pyrolysis instrument with the instrument model, helium as carrier gas, an FID (flame ionization detector) and an infrared detector as detectors to measure the content of inorganic carbon in the rock, wherein the test results are shown in the attached table 1;
s106: calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon;
wherein, the carbon substance balance formula is as follows:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaCO)3) Is CaCO3The mass fraction of (a) to (b),ωdolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock, M (CaCO)3)＝100，M(MgCa(CO3)2)＝184，M(C)＝12，M(Mg)＝24；
Calculating the relative proportion of calcium and magnesium elements in the rock by adopting the formula (2),
M(CaCO3)＝100，M(MgCa(CO3)2)＝184，M(Ca)＝40，M(Mg)＝24；
calculating the percentage content of calcite and the percentage content of dolomite by adopting a formula (3) and a formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element;
the test results are calculated by using the formulas (3) and (4), the percentage content of calcite and the percentage content of dolomite are respectively calculated, the percentage ratio of calcite to dolomite is calculated, and the results are shown in the attached table 1;
s108: calculating the degree of dolomisation of the rock based on the percentage content of calcite and the percentage content of dolomite;
wherein, the ratio of the percent content of dolomite to the percent content of calcite is the degree of dolomization of the rock.
Attached Table 1 test results and calculation results
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A rock clouding computing method, comprising:
obtaining the relative proportion of calcium and magnesium elements in the rock;
obtaining the content of inorganic carbon in the rock;
calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon;
calculating the degree of rock clouding based on the calcite and dolomite percentage contents.
2. The method of claim 1, wherein the carbon material balance formula is:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaC)O3) Is CaCO3Mass fraction of (a), ωDolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock.
3. The method of claim 1, wherein the percent calcite content and the percent dolomite content are calculated using the formula (3) and the formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element.
4. The method for calculating the dolomite of the rock as claimed in claim 1, wherein the relative proportion of calcium and magnesium elements in the rock is determined by an X-ray fluorescence spectrometer.
5. The method according to claim 1, wherein the content of inorganic carbon in the rock is determined by a rock pyrolyser.
6. A rock clouding computing system, the system comprising:
a memory storing computer-executable instructions;
a processor executing computer executable instructions in the memory to perform the steps of:
obtaining the relative proportion of calcium and magnesium elements in the rock;
obtaining the content of inorganic carbon in the rock;
calculating the percentage content of calcite and the percentage content of dolomite according to a carbon material balance formula based on the relative proportion of calcium and magnesium elements and the content of inorganic carbon;
calculating the degree of rock clouding based on the calcite and dolomite percentage contents.
7. The petrodolomized computing system of claim 6, wherein the carbon mass balance formula is:
wherein, ω isCalciteIs the percentage content of calcite, M (C) is the mass fraction of C element, M (CaCO)3) Is CaCO3Mass fraction of (a), ωDolomiteIn terms of percent dolomite, M (MgCa (CO)3)2) Is MgCa (CO)3)2CC is the inorganic carbon content in the rock.
8. The petrodolomisation computing system according to claim 6, wherein the percentage contents of calcite and dolomite are calculated using formula (3) and formula (4),
wherein, ω isDolomiteIs the percentage content of dolomite, omegaCalciteIs the percentage content of calcite, M (Mg) is the mass fraction of Mg element, M (MgCa (CO)3)2) Is MgCa (CO)3)2The mass fraction of (a) to (b),
is the relative proportion of Ca and Mg elements in the rock, M (Ca) is the mass fraction of Ca element, CC is the content of inorganic carbon in the rock, M (CaCO)3) Is CaCO3M (C) is the mass fraction of the C element.
9. The rock clouding computing system of claim 6, further comprising an X-ray fluorescence spectrometer for measuring relative proportions of calcium and magnesium elements in the rock.
10. The rock clouding computing system of claim 6, further comprising a rock pyrolyser for determining inorganic carbon content in the rock.
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