CN104564042A - Method for evaluating brittleness of shale reservoir - Google Patents
Method for evaluating brittleness of shale reservoir Download PDFInfo
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- CN104564042A CN104564042A CN201410790723.6A CN201410790723A CN104564042A CN 104564042 A CN104564042 A CN 104564042A CN 201410790723 A CN201410790723 A CN 201410790723A CN 104564042 A CN104564042 A CN 104564042A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention provides a method for evaluating brittleness of a shale reservoir and belongs to the technical field of nonconventional oil and gas reservoir evaluation. The method comprises the following steps: acquiring an elastic parameter and a brittleness mineral parameter of the shale reservoir to be evaluated, wherein the elastic parameter comprises Young modulus*density; carrying out cross analysis on the Young modulus*density and other elastic parameters and/or the brittleness mineral parameter and according to a cross analysis result, determining a value domain of the Young modulus*density; according to p-wave and s-wave impedances obtained by prestack inversion, establishing a Young modulus*density attribute volume; evaluating the brittleness of the shale reservoir to be evaluated by the Young modulus*density attribute volume in the value domain. According to the invention, accuracy of evaluating the brittleness of the shale reservoir is improved, prediction on planar distribution of the brittleness in the integral research region is implemented and the method has wide application prospect in the field of exploration and development of shale gas.
Description
Technical field
The present invention relates to a kind of evaluation method of shale reservoir fragility, belong to unconventionaloil pool reservoir assessment technology field.
Background technology
Shale gas is a kind of unconventional gas resource, because shale belongs to ultralow hole low permeability reservoir, cause its Reservoir model, gas accumulation mode and development scheme all to there is very big-difference with conventional gas and oil reservoir, therefore the exploitation of shale gas must implement reservoir fracturing improvement.Reservoir fracturing improvement is raising shale gas reservoir permeability, ensures the key measure that shale gas is exploited smoothly.There are some researches show, in the region that reservoir fragility is large, linked up, so increase reservoir reconstruction volume can improve shale gas recovery ratio because rock more easily presses off and more easily forms seam net.Therefore, finding shale height brittle zone is the key factor affecting shale gas output.
Existing shale reservoir brittleness evaluation method mainly wraps two kinds, the first is that the second is based on three dimensional seismic data and utilizes the result of prestack elastic parameter inversion to characterize shale reservoir fragility according to the quartz content instruction shale reservoir fragility in rock forming mineral component.First method to be logged well or core test is master, although precision is relatively high, can only reflect that single wellhole fragility changes, cannot meet and predict whole study area fragility planar distribution.Second method utilizes the inversion result of prestack elastic parameter to build brittleness index, and because the existing acquisition to elastic parameter is more difficult, therefore the precision of corresponding elastic parameter is also lower, is difficult to realize the flexible exact evaluation of shale reservoir.
Summary of the invention
The present invention is cannot meeting of solving that existing shale reservoir brittleness evaluation technology exists to the prediction of whole study area fragility planar distribution and the lower problem of evaluation precision, and then propose a kind of evaluation method of shale reservoir fragility, specifically comprise following technical scheme:
An evaluation method for shale reservoir fragility, comprising:
Obtain elastic parameter and the brittle mineral parameter of shale reservoir to be evaluated, described elastic parameter comprises young's modulus of elasticity * density;
Described young's modulus of elasticity * density and elastic parameter described in other and/or described brittle mineral parameter are carried out cross analysis, and determines the codomain of described young's modulus of elasticity * density according to the result of described cross analysis;
Young's modulus of elasticity * density attributes body is built according to the wave impedance in length and breadth obtained by prestack inversion;
Described young's modulus of elasticity * density attributes body is evaluated the fragility of described shale reservoir to be evaluated in described codomain.
In the evaluation method of shale reservoir fragility of the present invention, described young's modulus of elasticity * density and elastic parameter described in other and/or described brittle mineral parameter are carried out cross analysis and comprise:
Arbitrarily at least two the described elastic parameters comprising described young's modulus of elasticity * density are carried out cross analysis and maybe will comprise any two described elastic parameters of young's modulus of elasticity * density and brittle mineral parameter described in any one carries out cross analysis, and determine the codomain of described young's modulus of elasticity * density according to the result of described analysis.
In the evaluation method of shale reservoir fragility of the present invention, described elastic parameter also comprise in length and breadth wave impedance, draw extra large constant * density and modulus of shearing * density, described brittle mineral parameter comprises quartz content, shale content and calcite content.
In the evaluation method of shale reservoir fragility of the present invention, described young's modulus of elasticity is obtained by following formulae discovery:
E＝3k(1-σ)
Wherein, E represents young's modulus of elasticity, and k represents bulk modulus; σ represents poisson's ratio.
In the evaluation method of shale reservoir fragility of the present invention, described poisson's ratio is obtained by following formulae discovery:
Wherein, V
prepresent velocity of longitudinal wave, V
srepresent shear wave velocity.
In the evaluation method of shale reservoir fragility of the present invention, described young's modulus of elasticity * density attributes body is obtained by following formulae discovery:
Wherein, ρ represents density, I
prepresent p-wave impedance, I
srepresent S-wave impedance.
In the evaluation method of shale reservoir fragility of the present invention, described brittle mineral parameter obtains according to the quantitative relationship between described quartz content, shale content and calcite content and described young's modulus of elasticity * density.
In the evaluation method of shale reservoir fragility of the present invention, the elastic parameter of described shale reservoir to be evaluated and brittle mineral parameter are obtained by the well-log information of described shale reservoir to be evaluated.
The invention has the beneficial effects as follows: evaluate shale reservoir fragility by the product of young's modulus of elasticity and density, because the product of young's modulus of elasticity and density can be characterized by the combined result of wave impedance in length and breadth, and wave impedance relative density in prestack inversion is more accurately in length and breadth, thereby eliminate the impact on shale reservoir brittleness evaluation precision caused because density item accuracy is poor, thus improve brittleness evaluation precision, and to the prediction of whole study area fragility planar distribution, have broad application prospects in shale gas exploration and development field.
Accompanying drawing explanation
Fig. 1 is the flow chart of the evaluation method showing shale reservoir fragility in a schematic manner.
The figure that crosses of the modulus of shearing * density that Fig. 2 provides for this detailed description of the invention and young's modulus of elasticity * density.
Fig. 3 characterizes the response diagram of shale reservoir fragility to be evaluated on shale reservoir section for the young's modulus of elasticity * density that this detailed description of the invention provides.
The fragility planar distribution figure of the shale reservoir to be measured that Fig. 4 provides for this detailed description of the invention.
Detailed description of the invention
In the state of the art, owing to needing wide-angle information (i.e. long geophone offset) to the extraction of density information in this inversion result, and the geophone offset arrangement of large length cannot be born in actual production, and wide-angle information seismic data quality is also difficult to ensure.Therefore, the key asking for the evaluation method being shale reservoir fragility of density is also this area technical barrier for a long time simultaneously.This detailed description of the invention propose technology dry for existing shale reservoir brittleness evaluation method because of the not high impact brought evaluation result of density item precision, a kind of evaluation method of shale reservoir fragility is proposed, fragility is evaluated by the product of young's modulus of elasticity and density, because the product of attribute young's modulus of elasticity and density can directly be characterized by the combined result of wave impedance in length and breadth, and wave impedance relative density in prestack inversion is more accurately in length and breadth, thus eliminating the need because density item is forbidden the impact that brings, thus improve brittleness evaluation precision.
Shown in the evaluation method composition graphs 1 of the shale reservoir fragility that this detailed description of the invention proposes, comprising:
Step 11, obtain elastic parameter and the brittle mineral parameter of shale reservoir to be evaluated, described elastic parameter comprises young's modulus of elasticity * density.
Described elastic parameter can according to well-log information, and as acquisitions such as sound wave, density, dipole loggings (if without actual measurement can rule of thumb formula fitting), corresponding elastic parameter can comprise: wave impedance (I in length and breadth
p, I
s), draw extra large constant * density (λ ρ), modulus of shearing * density (μ ρ) and young's modulus of elasticity * density (E ρ).
Described brittle mineral parameter comprises quartz content (V
quartz), shale content (V
clay) and calcite content (V
calcite), quartz content, shale content and calcite content is calculated by existing log, and according to by the quantitative relationship between described quartz content, shale content and calcite content and described young's modulus of elasticity * density is obtained described quartz content percentage, shale content percentage and calcite content percentage.
Step 12, carries out cross analysis by described young's modulus of elasticity * density and described elastic parameter and/or described brittle mineral parameter, and determines the codomain of described young's modulus of elasticity * density according to the result of described cross analysis.
The codomain of described young's modulus of elasticity * density can be determined by cross analysis, preferably two or three elastic parameters any comprising young's modulus of elasticity * density can be carried out cross analysis, or any two elastic parameters and any one brittle mineral parameter that comprise young's modulus of elasticity * density are carried out cross analysis, and according to the codomain at the described figure determination young's modulus of elasticity * density place that crosses obtained by cross analysis.
Step 13, builds young's modulus of elasticity * density attributes body according to the wave impedance in length and breadth obtained by prestack inversion.
Due to the acquisition that wave impedance can be more accurate in prestack inversion process in length and breadth, preferably can adopt following method: first based on sound wave, shear wave, density log curve, then concentrate from prestack road and extract different angular-trace gathers, generally at least want the angular-trace gather that three different, grow approximate equation (as Sheuy, 1985) according to Zuo Buni and can solve wave impedance, density item in length and breadth.So the data computational accuracy of the brittleness evaluation process of shale reservoir can be improved.Young's modulus of elasticity is wherein the physical quantity characterizing rock rigidity, can represent by bulk modulus and poisson's ratio:
E＝3k(1-σ) (1)
Wherein, E represents young's modulus of elasticity, and k represents bulk modulus; σ represents poisson's ratio.Described poisson's ratio can be expressed as:
Wherein, wherein, V
prepresent velocity of longitudinal wave, V
srepresent shear wave velocity.Formula (2) is substituted into formula (1), then obtains:
Wherein, ρ represents density.ρ is multiplied by formula (3) both sides simultaneously, and I
p=ρ V
p, I
s=ρ V
s, then formula (3) can be write as:
Wherein, I
prepresent p-wave impedance, I
srepresent S-wave impedance.
Formula (4) is then the young's modulus of elasticity * density attributes body built by wave impedance in length and breadth, owing to not comprising density item ρ in this attribute volume, and the wave impedance in length and breadth obtained in prestack inversion process has higher precision, therefore evaluated by the fragility of described young's modulus of elasticity * density attributes body to shale reservoir to be measured and also can obtain higher rating precision.
Step 14, evaluates described young's modulus of elasticity * density attributes body the fragility of described shale reservoir to be evaluated in described codomain.
According to the young's modulus of elasticity * density attributes body that formula (4) builds, and in convolution (2) and formula (3), utilize the codomain at cross analysis determined young's modulus of elasticity * density place, the fragility of shale reservoir to be measured is evaluated, thus obtains the planar distribution of shale fragility.
Carry out cross analysis using young's modulus of elasticity * density, poisson's ratio and quartz content to be below described in detail as the evaluation method of embodiment to described shale reservoir fragility.
Shown in Fig. 2 is the figure that crosses of young's modulus of elasticity * density and poisson's ratio, according to well logging information by young's modulus of elasticity * density attributes (E ρ), poisson's ratio (Poisson Ratio) and quartz content (V
quartz) three carries out cross analysis, can determine that quartz content is greater than 60% (V
quartz>60%) region is the boxed area in Fig. 2, and the codomain scope of the young's modulus of elasticity * density that this boxed area is corresponding is for being greater than 120GPa*g/cc.Value young's modulus of elasticity * density being greater than 120GPa*g/cc is projected on the young's modulus of elasticity * density attributes body that built by prestack inversion, is namely that young's modulus of elasticity * density characterizes the response of shale reservoir fragility to be evaluated on shale reservoir section.Known shown in composition graphs 3, the region that shale reservoir fragility to be evaluated is higher and log coincide better.Similarly, value young's modulus of elasticity * density being greater than 120GPa*g/cc projects on young's modulus of elasticity * density attributes body, can obtain the shale reservoir fragility planar distribution (quartz content >60%) to be evaluated shown in Fig. 4.In the diagram, colour code represents the property value of young's modulus of elasticity * density, and it is E* ρ >120GPa*g/cc that redness arrives white again to yellow, the region that corresponding fragility is greater than 60%, and redness arrives white brittle again to yellow and strengthens gradually, and white brittle is maximum.
The evaluation method of the shale reservoir fragility adopting this detailed description of the invention to propose, shale reservoir fragility is evaluated by the product of young's modulus of elasticity and density, because the product of young's modulus of elasticity and density can be characterized by the combined result of wave impedance in length and breadth, and wave impedance relative density in prestack inversion is more accurately in length and breadth, thereby eliminate the impact on shale reservoir brittleness evaluation precision caused because density item accuracy is poor, thus improve brittleness evaluation precision, and whole study area fragility planar distribution is predicted, have broad application prospects in shale gas exploration and development field.
This detailed description of the invention is clearly and completely described technical scheme of the present invention, and embodiment is wherein only a part of embodiment of the present invention, and is not whole embodiments.Based on the embodiment in the present invention, other embodiments all that those skilled in the art are not obtaining under the prerequisite of creative work all belong to protection scope of the present invention.
Claims (8)
1. an evaluation method for shale reservoir fragility, is characterized in that, comprising:
Obtain elastic parameter and the brittle mineral parameter of shale reservoir to be evaluated, described elastic parameter comprises young's modulus of elasticity * density;
Described young's modulus of elasticity * density and elastic parameter described in other and/or described brittle mineral parameter are carried out cross analysis, and determines the codomain of described young's modulus of elasticity * density according to the result of described cross analysis;
Young's modulus of elasticity * density attributes body is built according to the wave impedance in length and breadth obtained by prestack inversion;
Described young's modulus of elasticity * density attributes body is evaluated the fragility of described shale reservoir to be evaluated in described codomain.
2. the method for claim 1, is characterized in that, described young's modulus of elasticity * density and elastic parameter described in other and/or described brittle mineral parameter is carried out cross analysis and comprises:
Arbitrarily at least two the described elastic parameters comprising described young's modulus of elasticity * density are carried out cross analysis and maybe will comprise any two described elastic parameters of young's modulus of elasticity * density and brittle mineral parameter described in any one carries out cross analysis, and determine the codomain of described young's modulus of elasticity * density according to the result of described analysis.
3. method as claimed in claim 2, is characterized in that, described elastic parameter also comprise in length and breadth wave impedance, draw extra large constant * density and modulus of shearing * density, described brittle mineral parameter comprises quartz content, shale content and calcite content.
4. the method for claim 1, is characterized in that, described young's modulus of elasticity is obtained by following formulae discovery:
E＝3k(1-σ)
Wherein, E represents young's modulus of elasticity, and k represents bulk modulus; σ represents poisson's ratio.
5. method as claimed in claim 4, it is characterized in that, described poisson's ratio is obtained by following formulae discovery:
Wherein, V
prepresent velocity of longitudinal wave, V
srepresent shear wave velocity.
6. method as claimed in claim 5, it is characterized in that, described young's modulus of elasticity * density attributes body is obtained by following formulae discovery:
Wherein, ρ represents density, I
prepresent p-wave impedance, I
srepresent S-wave impedance.
7. the method for claim 1, is characterized in that, described brittle mineral parameter obtains according to the quantitative relationship between described quartz content, shale content and calcite content and described young's modulus of elasticity * density.
8. the method for claim 1, is characterized in that, the elastic parameter of described shale reservoir to be evaluated and brittle mineral parameter are obtained by the well-log information of described shale reservoir to be evaluated.
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| CN104865124A (en) * | 2015-05-30 | 2015-08-26 | 重庆地质矿产研究院 | Shale brittleness index determination method based on rock stress-strain curve and ultrasonic longitudinal wave velocity |
| CN105089661A (en) * | 2015-07-16 | 2015-11-25 | 中国石油天然气股份有限公司 | Method for continuously judging fast and slow stratums |
| CN105257287A (en) * | 2015-11-05 | 2016-01-20 | 成都理工大学 | Method for evaluating parameters of oil reservoir of oil shale |
| CN105370268A (en) * | 2015-10-23 | 2016-03-02 | 中国石油天然气集团公司 | Method and device of optimizing staged fracturing parameters of horizontal well |
| CN105426650A (en) * | 2015-06-08 | 2016-03-23 | 中国石油集团川庆钻探工程有限公司 | Method for selecting out shale gas fracturing modification well section by using logging data |
| CN105865955A (en) * | 2016-03-23 | 2016-08-17 | 成都创源油气技术开发有限公司 | Logging evaluation method for brittleness of shale |
| CN106568919A (en) * | 2015-10-13 | 2017-04-19 | 中国石油化工股份有限公司 | Shale brittleness prediction method based on rock physical analysis |
| CN106569266A (en) * | 2015-10-12 | 2017-04-19 | 中国石油化工股份有限公司 | Method for predicting brittle mineral content in gas reservoir layer of shale |
| CN110186755A (en) * | 2019-04-23 | 2019-08-30 | 陕西国防工业职业技术学院 | One kind is with brill shale brittleness evaluation method |
| CN110552690A (en) * | 2018-05-30 | 2019-12-10 | 中国石油化工股份有限公司 | Shale reservoir brittleness evaluation method |
| CN110568150A (en) * | 2019-04-28 | 2019-12-13 | 中国石油天然气股份有限公司 | Oil shale identification method and device |
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| CN104865124A (en) * | 2015-05-30 | 2015-08-26 | 重庆地质矿产研究院 | Shale brittleness index determination method based on rock stress-strain curve and ultrasonic longitudinal wave velocity |
| CN104865124B (en) * | 2015-05-30 | 2017-10-27 | 重庆地质矿产研究院 | Shale brittleness index determination method based on rock stress-strain curve and ultrasonic longitudinal wave velocity |
| CN105426650A (en) * | 2015-06-08 | 2016-03-23 | 中国石油集团川庆钻探工程有限公司 | Method for selecting out shale gas fracturing modification well section by using logging data |
| CN105089661A (en) * | 2015-07-16 | 2015-11-25 | 中国石油天然气股份有限公司 | Method for continuously judging fast and slow stratums |
| CN105089661B (en) * | 2015-07-16 | 2017-12-05 | 中国石油天然气股份有限公司 | A kind of continuous method for judging speed stratum |
| CN106569266A (en) * | 2015-10-12 | 2017-04-19 | 中国石油化工股份有限公司 | Method for predicting brittle mineral content in gas reservoir layer of shale |
| CN106568919A (en) * | 2015-10-13 | 2017-04-19 | 中国石油化工股份有限公司 | Shale brittleness prediction method based on rock physical analysis |
| CN105370268A (en) * | 2015-10-23 | 2016-03-02 | 中国石油天然气集团公司 | Method and device of optimizing staged fracturing parameters of horizontal well |
| CN105257287A (en) * | 2015-11-05 | 2016-01-20 | 成都理工大学 | Method for evaluating parameters of oil reservoir of oil shale |
| CN105865955A (en) * | 2016-03-23 | 2016-08-17 | 成都创源油气技术开发有限公司 | Logging evaluation method for brittleness of shale |
| CN110552690A (en) * | 2018-05-30 | 2019-12-10 | 中国石油化工股份有限公司 | Shale reservoir brittleness evaluation method |
| CN110186755A (en) * | 2019-04-23 | 2019-08-30 | 陕西国防工业职业技术学院 | One kind is with brill shale brittleness evaluation method |
| CN110568150A (en) * | 2019-04-28 | 2019-12-13 | 中国石油天然气股份有限公司 | Oil shale identification method and device |
| CN110568150B (en) * | 2019-04-28 | 2022-03-01 | 中国石油天然气股份有限公司 | Oil shale identification method and device |
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