WO2022001259A1 - 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 - Google Patents
基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 Download PDFInfo
- Publication number
- WO2022001259A1 WO2022001259A1 PCT/CN2021/084376 CN2021084376W WO2022001259A1 WO 2022001259 A1 WO2022001259 A1 WO 2022001259A1 CN 2021084376 W CN2021084376 W CN 2021084376W WO 2022001259 A1 WO2022001259 A1 WO 2022001259A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- porosity
- pore
- shale
- phase
- afm
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q30/00—Auxiliary means serving to assist or improve the scanning probe techniques or apparatus, e.g. display or data processing devices
- G01Q30/04—Display or data processing devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
- G01Q60/24—AFM [Atomic Force Microscopy] or apparatus therefor, e.g. AFM probes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Definitions
- the invention relates to an AFM-based shale porosity calculation and component pore contribution evaluation method, which belongs to the field of shale gas geology.
- Shale gas plays an increasingly important role in the world energy sector. Shale gas reservoirs usually develop multi-scale micro-nanopores and fractures, with complex pore structure and significant microscopic heterogeneity, which restrict the success rate of exploration and development.
- the material composition of shale is the basis for the development of the pore system, however, the contribution of different components of the reservoir to the pore remains unclear. Understanding the pore structure of shale gas reservoirs, distinguishing the pore contributions of main material components, finely characterizing shale gas reservoirs, accurately evaluating shale gas resources, revealing the mechanism of shale gas accumulation, and guiding the division of favorable areas Significance.
- Atomic force microscopy can be used to qualitatively and quantitatively characterize shale pore structure, but AFM cannot directly measure shale porosity, which is an extremely important parameter for unconventional reservoir evaluation. This limits the wide application of AFM in the field of unconventional oil and gas. Previous studies have shown that the change of AFM phase is closely related to material composition, which provides a theoretical basis for using AFM to evaluate the pore contribution of the main material composition, but no relevant research has been attempted yet.
- the present invention provides an AFM-based shale porosity calculation and component pore contribution evaluation method, which makes up for the deficiency of AFM in measuring shale porosity and promotes the mineral analysis ability and porosity of AFM. Combination of structure determination capabilities.
- the AFM-based shale porosity calculation and component pore contribution evaluation method adopted in the present invention includes the following steps:
- phase pore function uses the double-threshold discrete integration method to obtain the phase pore function, use the phase pore function to calculate the porosity in different phase intervals, perform linear fitting on the porosity and shale material composition in different phase intervals, and calculate the difference between them.
- the correlation coefficient is used to evaluate the porosity contribution of different components.
- the specific steps for obtaining the pore volume are:
- g(x,y) is the pore function
- f(x,y) is the elevation function
- T is the height threshold, m
- V is the pore volume, m 3
- A is the projected area, m 2
- h is the elevation, m
- a and b are the projection width and length, respectively, m.
- the step of calculating the shale porosity in the step S2 is:
- the double-threshold discrete integration method in the step S3 is specifically:
- a threshold method is performed on the phase data again, and the phase threshold P is selected to segment the phase porosity function.
- the calculation formula is:
- ⁇ (x, y) is the phase pore function
- P is the phase threshold, °.
- the phase porosity function is used to calculate the porosity in different phase intervals, specifically:
- ⁇ is the phase porosity, %.
- the AFM-based shale porosity calculation and component pore contribution evaluation method provided by the present invention broadens the application scope of AFM in the field of unconventional oil and gas.
- the present invention provides an idea for studying the pore contribution of different material components in shale gas reservoirs, and lays a theoretical foundation for fine characterization of shale gas reservoirs.
- Fig. 1 is the implementation flow chart of the present invention
- Figure 2 is a schematic diagram of the virtual plane cutting the sample surface from the bottom to the top; the three figures from top to bottom are the relative positions of the cutting bottom surface, the middle position and the top surface in turn;
- Figure 3 is the correlation between the porosity and the main material components in different phase intervals in the present invention
- (a) in the figure is the correlation between the chlorite content and the porosity in the phase interval -20 ⁇ -5°
- (b) is the potassium The correlation between the feldspar content and the porosity in the phase range of -10 to 10°
- (c) is the correlation between the quartz content and the porosity in the phase range of -5 to 15°
- (d) is the content of brittle minerals and the phase range of 0 to 10°.
- (e) is the correlation of organic matter content and total porosity;
- FIG 4 is a comparison of the present invention, low porosity and the experimentally measured N 2 adsorption.
- the AFM-based shale porosity calculation and component porosity contribution evaluation method includes the following steps:
- the pore function is determined by judging whether the surface elevation function meets the requirements of the elevation threshold, so as to select the pores in the AFM image.
- the threshold segmentation method can be expressed as the following formula:
- g(x,y) is the pore function
- f(x,y) is the elevation function
- T is the height threshold, m;
- V is the pore volume, m 3 ;
- A is the projected area, m 2 ;
- h is the elevation, m;
- a and b are the projected width and length, respectively, m;
- the porosity can be obtained by dividing the pore volume by the product of the projected area and the selected elevation.
- the porosity calculation formula is:
- ⁇ porosity, %
- the double-threshold discrete integration method that is, changing the phase threshold on the basis of the fixed elevation threshold, so as to obtain the phase pore function.
- the double-threshold discrete integration method can be expressed by the following formula:
- ⁇ (x, y) is the phase pore function
- P is the phase threshold, °
- ⁇ ⁇ is the phase porosity, %
- the flatten order in step 1) is generally 2 order for shale samples.
- the correction method in the step 3) is: taking all the elevation values minus the minimum value of the elevation values as the new elevation value.
- the porosity test and the pore contribution evaluation of main minerals are performed on the Longmaxi Formation shale in Well Wuxi 2 in northeastern Chongqing based on AFM.
- the steps are as follows:
- the threshold segmentation method can be expressed as the following formula:
- g(x,y) is the pore function
- f(x,y) is the elevation function
- T is the height threshold, m;
- V is the pore volume, m 3 ;
- A is the projected area, m 2 ;
- h is the elevation, m;
- a and b are the projected width and length, respectively, m;
- the porosity can be obtained by dividing the pore volume by the product of the projected area and the selected elevation.
- the porosity calculation formula can be expressed as:
- ⁇ porosity, %
- the double-threshold discrete integration method that is, change the phase threshold on the basis of the fixed elevation threshold, so as to obtain the phase pore function.
- the double-threshold discrete integration method can be expressed by the following formula:
- ⁇ (x, y) is the phase pore function
- P is the phase threshold, °
- ⁇ ⁇ is the phase porosity, %
- the potassium feldspar content has a significant positive correlation with the porosity provided by the phase range -10 ⁇ 10° (R 2 is 94.21%), indicating that the pores in this range are almost entirely composed of potassium Provided by feldspar; in the figure (c), the pores provided in the phase interval -5 to 15° have a good positive correlation with the quartz content, indicating that this interval is mainly quartz-derived pores; in the figure (d) the phase interval of 0 to 10°
- the provided pores are positively correlated with the brittle mineral content, indicating that there are many brittle mineral pores developed in this phase interval; in the figure (e) TOC content is positively correlated with the total porosity, and the correlation is good (R 2 is 81.02%) , indicating that the Longmaxi Formation shale mainly develops pores of organic origin, and the organic pores contribute to each phase interval.
- clay minerals, organic matter and brittle minerals all provide certain pores, among which chlorite is dominant in
- the porosity is calculated, the porosity of the shale sample wells Wuxi 2 calculated by the method of the present invention obtained by the porosity and the low-temperature N 2 adsorption experiments was compared, the results shown in Figure 4, The analysis shows that the porosity calculated by AFM is basically consistent with the porosity converted from the low-temperature N 2 adsorption experiment, indicating that the porosity calculation method based on AFM proposed in the present invention is reliable.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Health & Medical Sciences (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
Claims (6)
- 基于AFM的页岩孔隙度计算及组分孔隙贡献评价方法,其特征在于,包括如下步骤:S1、通过处理后的AFM数据提取出页岩表面三维高程数据和相位数据,对页岩表面三维高程数据进行校正;S2、采用阈值法,选取高度阈值,分割出孔隙函数,求取孔体积,根据孔隙度定义,计算出页岩孔隙度;S3、采用双阈值离散积分法,得到相位孔隙函数,利用相位孔隙函数计算不同相位区间内的孔隙度,将不同相位区间内的孔隙度和页岩物质成分进行线性拟合并计算它们之间的相关系数,以此来评价不同组分的孔隙贡献。
- 根据权利要求1所述的基于AFM的页岩孔隙度计算及组分孔隙贡献评价方法,其特征在于,所述步骤S1中,将页岩表面形貌三维坐标数据以页岩表面最低点高程为零基准高程进行高程校正。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2115553.6A GB2601238B (en) | 2020-06-30 | 2021-03-31 | AFM-Based Shale Porosity Calculation And Component Pore Contribution Evaluation Method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010619791.1A CN111766407B (zh) | 2020-06-30 | 2020-06-30 | 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 |
CN202010619791.1 | 2020-06-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022001259A1 true WO2022001259A1 (zh) | 2022-01-06 |
Family
ID=72723064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2021/084376 WO2022001259A1 (zh) | 2020-06-30 | 2021-03-31 | 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN111766407B (zh) |
WO (1) | WO2022001259A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115201247A (zh) * | 2022-06-17 | 2022-10-18 | 中国地质大学(武汉) | 一种确定不同页岩油组分储集空间的方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111766407B (zh) * | 2020-06-30 | 2021-05-25 | 中国矿业大学 | 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6791081B1 (en) * | 2002-03-27 | 2004-09-14 | Advanced Micro Devices, Inc. | Method for determining pore characteristics in porous materials |
CN102183450A (zh) * | 2011-04-20 | 2011-09-14 | 东北石油大学 | 储层岩心微观孔隙结构原子力显微镜的表征方法 |
CN103033456A (zh) * | 2012-12-13 | 2013-04-10 | 北京农业信息技术研究中心 | 基于sfs算法的土壤孔隙度检测方法 |
CN105806765A (zh) * | 2016-04-13 | 2016-07-27 | 南京大学(苏州)高新技术研究院 | 一种显微ct扫描土体空间孔隙结构的精细化表征方法 |
CN111289778A (zh) * | 2020-03-12 | 2020-06-16 | 中国石油化工股份有限公司 | 一种页岩样品扫描电镜和原子力显微镜原位观察的方法 |
CN111766407A (zh) * | 2020-06-30 | 2020-10-13 | 中国矿业大学 | 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101639434A (zh) * | 2009-08-27 | 2010-02-03 | 太原理工大学 | 基于显微图像分析固体材料孔隙结构的方法 |
ES2655667T3 (es) * | 2011-10-14 | 2018-02-21 | Ingrain, Inc. | Método y sistema de imagen dual para la generación de una imagen multidimensional de una muestra |
US9128210B2 (en) * | 2012-08-17 | 2015-09-08 | Schlumberger Technology Corporation | Method to characterize shales at high spatial resolution |
CN105957118B (zh) * | 2016-04-27 | 2017-10-27 | 中国科学院地质与地球物理研究所 | 一种页岩孔隙成像方法和装置 |
CN108459034A (zh) * | 2016-11-18 | 2018-08-28 | 中国石油化工股份有限公司 | 一种砂岩酸岩反应效果可视化定量评价方法 |
CN110910444B (zh) * | 2019-11-14 | 2022-12-09 | 中国科学院力学研究所 | 一种res尺度页岩等效三维孔隙参数快速提取方法 |
-
2020
- 2020-06-30 CN CN202010619791.1A patent/CN111766407B/zh active Active
-
2021
- 2021-03-31 WO PCT/CN2021/084376 patent/WO2022001259A1/zh active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6791081B1 (en) * | 2002-03-27 | 2004-09-14 | Advanced Micro Devices, Inc. | Method for determining pore characteristics in porous materials |
CN102183450A (zh) * | 2011-04-20 | 2011-09-14 | 东北石油大学 | 储层岩心微观孔隙结构原子力显微镜的表征方法 |
CN103033456A (zh) * | 2012-12-13 | 2013-04-10 | 北京农业信息技术研究中心 | 基于sfs算法的土壤孔隙度检测方法 |
CN105806765A (zh) * | 2016-04-13 | 2016-07-27 | 南京大学(苏州)高新技术研究院 | 一种显微ct扫描土体空间孔隙结构的精细化表征方法 |
CN111289778A (zh) * | 2020-03-12 | 2020-06-16 | 中国石油化工股份有限公司 | 一种页岩样品扫描电镜和原子力显微镜原位观察的方法 |
CN111766407A (zh) * | 2020-06-30 | 2020-10-13 | 中国矿业大学 | 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 |
Non-Patent Citations (1)
Title |
---|
BAI, YONGQUANG ET AL.: "AFM (AFM Based Pore Characterization of Shales and Its Relation to the Analytical Gas", JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION, vol. 46, no. 5, 30 September 2016 (2016-09-30), pages 1332 - 1341, XP055883872, ISSN: 1671-5888 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115201247A (zh) * | 2022-06-17 | 2022-10-18 | 中国地质大学(武汉) | 一种确定不同页岩油组分储集空间的方法 |
CN115201247B (zh) * | 2022-06-17 | 2024-06-04 | 中国地质大学(武汉) | 一种确定不同页岩油组分储集空间的方法 |
Also Published As
Publication number | Publication date |
---|---|
CN111766407B (zh) | 2021-05-25 |
CN111766407A (zh) | 2020-10-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2022001259A1 (zh) | 基于afm的页岩孔隙度计算及组分孔隙贡献评价方法 | |
CN110700820A (zh) | 松辽盆地北部致密油储层甜点分类方法 | |
CN109856688B (zh) | 基于核磁测井双tw极化增强法的流体性质识别方法 | |
CN116027453A (zh) | 一种水合物混合层饱和度定量评价方法及装置 | |
CN110208874B (zh) | 一种致密砂岩油藏有效储层识别方法 | |
Zhu et al. | Multi-scale characterization of organic matter pore space in deep marine shale combined with mathematical morphology | |
CN112145165A (zh) | 一种微裂缝-孔隙型储层动静态渗透率转换方法 | |
CN116104467A (zh) | 一种根据气测录井判断油气层流体性质的方法 | |
CN112185469B (zh) | 一种预测海域天然气水合物有利聚集区的方法 | |
CN111221038B (zh) | 薄储层厚度定量预测的方法和装置 | |
CN110895704B (zh) | 微生物丘滩复合体储集层类型识别方法、装置及存储介质 | |
CN109099880B (zh) | 岩体结构面粗糙度系数全域搜索测量方法 | |
CN112505154B (zh) | 泥页岩储层矿物成分含量解析与岩相识别表征方法 | |
CN115718056A (zh) | 一种测定花斑状碳酸盐岩中储层孔隙度的方法 | |
CN112346147A (zh) | 一种基于中子密度孔隙度差的储层评价方法 | |
CN112304843A (zh) | 一种泥页岩中页岩气吸附量定量表征方法 | |
CN111487393A (zh) | 一种古盐度值的测定方法、单井和多井古盐度平面图以及沉积相展布图的绘制方法 | |
Amanipoor | Providing a subsurface reservoir quality maps in oil fields by geostatistical methods | |
CN111693427A (zh) | 油气藏流体可动性的分析方法 | |
CN113805246B (zh) | 一种碳酸盐岩储层连通性评价图版及其生成方法和应用 | |
CN116291415B (zh) | 一种计算含气地层孔隙度的方法及系统 | |
CN115078599B (zh) | 基于原油全组分浓度的储层连通性评价方法 | |
CN115506786A (zh) | 一种非均质碳酸盐岩储层孔隙结构特征的判定方法 | |
CN114428049B (zh) | 一种计算古老碳酸盐岩储层沥青含量的方法 | |
CN117372737A (zh) | 一种基于电成像资料的砂砾岩储层基质产能分类方法、系统、设备及存储介质 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 202115553 Country of ref document: GB Kind code of ref document: A Free format text: PCT FILING DATE = 20210313 |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21832696 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21832696 Country of ref document: EP Kind code of ref document: A1 |