深层煤层气地质‒工程一体化“六性”测井评价及应用
丁蓉 , 李忠百 , 陈彤 , 姜亚南 , 胡刚 , 杜欣 , 安晓康 , 李勇
地球科学 ›› 2026, Vol. 51 ›› Issue (7) : 2462 -2481.
深层煤层气地质‒工程一体化“六性”测井评价及应用
Integrated Geological⁃Engineering Logging Evaluation and Application of “Six Properties” for Deep Coalbed Methane Reservoirs
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针对深层煤层气储层高温高压、强非均质性、孔裂隙系统复杂及地应力约束显著等特点,构建了岩性、生烃性、物性、含气性、可压性和应力特性“六性”地质‒工程协同评价体系.岩性表现为低自然伽马、低密度、高中子、高声波时差和相对高电阻率;生烃性可由元素测井、密度、声波和电阻率联合表征;物性受孔裂隙结构控制,可通过密度、声波、核磁共振、电成像和电阻率识别;含气性表现为高电阻率、中子‒密度异常和核磁响应差异;可压性由阵列声波、密度和元素测井约束;应力特性通过阵列声波、电成像、密度测井评价.基于上述认识,构建了由有机显微组分、无机矿物和孔隙流体组成的煤岩测井评价体积模型,形成岩性识别、生烃性评价、孔渗参数计算、吸附气‒游离气含量预测、可压性表征及地应力评价方法.电性响应受岩性组成、生烃演化、孔裂隙结构、含气状态、可压性特征和应力作用共同控制,具有综合性和多解性;与密度、声波、核磁、元素和成像测井联合应用,可降低单一参数解释不确定性,提高“六性”关键参数解释精度.大吉区块应用结果表明,优质储层具有低灰分、高镜质组含量、煤体结构较完整、煤层厚度大、含气量高、孔裂隙系统有效、可压性较好及应力差适中等特征,测井上表现为高阻‒高时差型.该方法可为甜点预测、水平井部署和压裂层段优选提供支撑.
To address the high temperature and pressure, strong heterogeneity, complex pore-fracture system, and significant in-situ stress constraints of deep coalbed methane reservoirs, this study establishes a geological-engineering collaborative evaluation framework based on six properties: lithology, hydrocarbon generation potential, petrophysical properties, gas-bearing property, fracability, and stress characteristics. The results show that lithology is characterized by low natural gamma, low density, high neutron response, high acoustic slowness, and relatively high resistivity. Hydrocarbon generation potential can be jointly characterized by elemental logging, density, acoustic, and resistivity logs. Petrophysical properties are controlled by pore-fracture structure and can be identified using density, acoustic, nuclear magnetic resonance, electrical imaging, and resistivity logs. Gas-bearing property is indicated by high resistivity, neutron-density anomaly, and nuclear magnetic resonance response differences. Fracability is constrained by array acoustic, density, and elemental logs, while stress characteristics are evaluated using array acoustic, electrical imaging, and density logs.Based on these understandings, a logging evaluation volume model composed of organic macerals, inorganic minerals, and pore fluids is constructed. Methods are developed for lithology identification, hydrocarbon generation evaluation, porosity and permeability calculation, adsorbed gas and free gas prediction, fracability characterization, and in-situ stress evaluation. Electrical responses are jointly controlled by lithologic composition, hydrocarbon generation evolution, pore-fracture structure, gas-bearing state, fracability, and stress conditions, showing strong comprehensiveness and non-uniqueness. Integrated application of electrical, density, acoustic, nuclear magnetic resonance, elemental, and imaging logs can reduce single-parameter interpretation uncertainty and improve the accuracy of key “six-properties” parameters. Application in the Daji Block shows that high-quality reservoirs are characterized by low ash content, high vitrinite content, relatively intact coal structure, large coal thickness, high gas content, effective pore-fracture systems, favorable fracability, and moderate stress difference, with high-resistivity and high-slowness logging responses. This method provides support for sweet spot prediction, horizontal well deployment, and fracturing interval optimization.
| [1] |
Chen, Y., Ma, D.M., Guo, C., et al., 2019.An Experimental Study on the Conductivity Changes in Coal during Methane Adsorption⁃Desorption and Their Influencing Factors. Acta Geologica Sinica (English Edition), 93(3):704-717. https://doi.org/10.1111/1755⁃6724.13873 |
| [2] |
Chen, Z. R., Liu, W., Shi, X., et al., 2026. Prediction of In⁃Situ Stress Field of Deep Coalbed Methane Considering Coalbed Structure Differences.Coal Science and Technology, 54(2): 360-369 (in Chinese with English abstract). |
| [3] |
Deng, Z., Zhao, Q., Fan, L. Y., et al., 2025.Key Controlling Factors of Coal⁃Rock Gas of Benxi Formation in Ordos Basin and Its Practical Significance.Coal Science and Technology, 53(S1): 233-251 (in Chinese with English abstract). |
| [4] |
Feng, Z.C., Wang, C., Dong, D., et al., 2018.Experimental Study of the Characteristic Changes of Coal Resistivity during the Gas Adsorption/Desorption Process. Advances in Materials Science and Engineering, 2018:1-7.https://doi.org/10.1155/2018/1450187 |
| [5] |
Gao, D. L., Yao, J., Wang, Z. M., et al., 2025. A Brief Discussion on Interdisciplinary Research of Mechanics and Oil & Gas Engineering.Chinese Journal of Theoretical and Applied Mechanics, 57(12): 2773-2788 (in Chinese with English abstract). |
| [6] |
Gong, F., Peng, S. P., Han, G., et al., 2025. Orthorhombic Rock Physics Modeling for Deep Coalbed Methane Reservoirs and Its Application: An Example of Benxi Formation Coal in Ordos Basin. Chinese Journal of Geophysics, 68(12): 4835-4850 (in Chinese with English abstract). |
| [7] |
Guo, G. S., Xing, L. R., Liao, X., et al., 2018. Analysis of Main Controlling Geological Factors of Production Based on “Three Qualities” of CBM Reservoir. Natural Gas Geoscience, 29(8): 1198-1204 (in Chinese with English abstract). |
| [8] |
Jiao, F. Z., Zhao, Q., Xiao, Y. H., et al., 2025.A Major Transformation from Coalbed Methane to Coal⁃Rock Gas Leading the “Coal⁃Rock Gas Revolution”.Acta Petrolei Sinica, 46(12): 2211-2225 (in Chinese with English abstract). |
| [9] |
Li, S., Tang, D. Z., Xu, H., et al., 2015.Evolution of Physical Differences in Various Buried Depth of Coal Reservoirs under Constraint of Stress.Acta Petrolei Sinica, 36(S1): 68-75 (in Chinese with English abstract). |
| [10] |
Li, X.C., An, Z.X., Zhang, Q., et al., 2020.Analysis of Resistivity Anisotropy of Loaded Coal Samples.Advances in Materials Science and Engineering, 2020:1-13.https://doi.org/10.1155/2020/9016583 |
| [11] |
Li, X. G., Tang, Z., Zhu, J. Y., et al., 2024.Research Progress and Prospect of Deep Coalrock Fracturing.Natural Gas Industry, 44(10): 126-139 (in Chinese with English abstract). |
| [12] |
Li, X. W., Liu, D. M., Cai, Y. D., et al., 2018. Moisture Content Characteristics of High Rank Coal Reservoir and Its Influence on Adsorption Capacity. Earth Science Frontiers, 25(4): 237-244 (in Chinese with English abstract). |
| [13] |
Li, Y., Gao, S., Wu, P., et al., 2023. Evaluation and Correction of Prediction Model for Free Gas Content in Deep Coalbed Methane:A Case Study of Deep Coal Seams in the Eastern Margin of Ordos Basin. Acta Petrolei Sinica, 44(11):1892-1902 (in Chinese with English abstract). |
| [14] |
Li, Y., Xu, W. K., Gao, J. X., et al., 2021. Mechanism of Coal Measure Gas Accumulation under Integrated Control of“Source Reservoir⁃Transport System”: A Case Study from East Margin of Ordos Basin. Journal of China Coal Society, 46(8): 2440-2453 (in Chinese with English abstract). |
| [15] |
Li, Y., Zou, C. N., Wang, M. W., et al., 2026.Formation, Distribution, Enrichment Pattern and Development Prospect of Coal⁃Rock Gas Worldwide.Natural Gas Industry, 46(1): 24-40 (in Chinese with English abstract). |
| [16] |
Liang, M. X., Sun, W. J., 2013. Application of Geophysical Logging in Parameters' Integrated Interpretation of Coal Reservoir—Taking the Well⁃A in PS Mining Area as an Example. Science Technology and Engineering, 13(18): 5121-5126, 5140 (in Chinese with English abstract). |
| [17] |
Lin, B., Chen, S., Yan, X. Y., et al., 2025.Efficient and Variable Viscosity Fracturing Fluid of Deep Coal Rock Gas and Popularization in Ultimate Volume Fracture.Journal of China Coal Society, 50(2): 1162-1174 (in Chinese with English abstract). |
| [18] |
Liu, X. S., Huang, D. J., Hu, J. L., et al., 2024. Reservoir Characteristics of Carboniferous Benxi Formation Coal⁃Rock Gas in the Central and Eastern Ordos Basin. Natural Gas Industry, 44(10): 51-62 (in Chinese with English abstract). |
| [19] |
Liu, Z. D., Zhao, J. Z., Shi, B. H., et al., 2015. Study on the Method of Quantitative Evaluation for “Three Qualities” of CBM Reservoir Using Logging Data: A Case Study from the Hancheng Mine at the Eastern Edge of the Ordos Basin. Natural Gas Geoscience, 26(5): 966-978 (in Chinese with English abstract). |
| [20] |
Mi, H. G., Wu, J., Peng, W. C., et al., 2024. Mechanical Characteristics and Fracture Propagation Mechanism of Deep Coal Reservoirs in the Shenfu Block.Coal Geology & Exploration, 52(8): 32-43 (in Chinese with English abstract). |
| [21] |
Niu, X.B., Fan, L.Y., Yan, X.X., et al., 2024. Enrichment Conditions and Resource Potential of Coal⁃Rock Gas in Ordos Basin, NW China.Petroleum Exploration and Development, 51(5):972-985 (in Chinese with English abstract). |
| [22] |
Qiao, Y. P., Shao, X. J., Huo, M. Y., et al., 2016. Progress and Prospect of CBM Geophysical Logging.Fault⁃Block Oil and Gas Field, 23(2): 181-184 (in Chinese with English abstract). |
| [23] |
Qin, Y., Tang, D. Z., Liu, D. M., et al., 2014.Geological Evaluation Theory and Technology Progress of Coal Reservoir Dynamics during Coalbed Methane Drainage.Coal Science and Technology, 42(1): 80-88 (in Chinese with English abstract). |
| [24] |
Shi, Y. J., He, Y. F., Wan, J. B., et al., 2024. Research on Logging Evaluation Methods for Geological Quality and Gas Content of Deep Coal Measure Gas.China Petroleum Exploration, 29(4): 126-141 (in Chinese with English abstract). |
| [25] |
Tang, S. H., Xi, Z. D., Zhang, S. H., et al., 2025. Occurrence Phase and Gas⁃Bearing Evolution of Deep Coalbed Methane.Coal Science and Technology, 53(3): 91-100 (in Chinese with English abstract). |
| [26] |
Tang, S. L., Tang, D. Z., Yang, J. S., et al., 2023. Pore Structure Characteristics and Gas Storage Potential of Deep Coal Reservoirs in Daning⁃Jixian Block of Ordos Basin. Acta Petrolei Sinica, 44(11): 1854-1866, 1902 (in Chinese with English abstract). |
| [27] |
Tang, X. Y., Chen, X. Y., Zheng, L. Q., et al., 2023.Review of Conductive Characteristics of Gas⁃Bearing Coal.Science Technology and Engineering, 23(25): 10617-10624 (in Chinese with English abstract). |
| [28] |
Wang, D., Liu, Z. D., Wang, C. W., et al., 2024. Logging⁃Based Evaluation for Geological⁃Engineering Sweet Spots in Deep Coal Reservoirs of the DJ Block, Ordos Basin.Oil & Gas Geology, 45(6): 1772-1788 (in Chinese with English abstract). |
| [29] |
Wang, H. Y., Yang, S. G., Zhang, L. P., et al., 2024. Experimental Analysis of the Mechanical Properties and Failure Behavior of Deep Coalbed Methane Reservoir Rocks.Processes, 12(6): 1125. https://doi.org/10.3390/pr12061125 |
| [30] |
Xu, F. Y., Yan, X., Lin, Z. P., et al., 2022. Research Progress and Development Direction of Key Technologies for Efficient Coalbed Methane Development in China.Coal Geology & Exploration, 50(3): 1-14 (in Chinese with English abstract). |
| [31] |
Zhang, L., Bian, L.H., Hou, W., et al., 2023. Pore Structure Characteristics and Exploration Significance of Deep Coal Reservoirs: A Case Study of Daning⁃Jixian Block in the Eastern Margin of Ordos Basin. Acta Petrolei Sinica, 44(11):1867-1878 (in Chinese with English abstract). |
| [32] |
Zhang, L., Xia, Z. L., Wang, B., et al., 2025. Well Log Evaluation Methods of Deep Source Rocks: The Jurassic Yangxia Formation in Kuqa Depression. Progress in Geophysics, 40(4): 1563-1576 (in Chinese with English abstract). |
| [33] |
Zhao, H. F., Shi, H. W., Xie, F., et al., 2025.A Novel Model for Calculating In Situ Stress within Deep Coal Seams Considering Microstructural Characteristics and Its Application.Coal Geology & Exploration, 53(11): 120-129 (in Chinese with English abstract). |
| [34] |
Zhao, W. B., Liu, H. L., Wang, H. C., et al., 2024. Microscopic Pore Characteristics of Coal Seam and the Controlling Effect of Sedimentary Environment on Pore Structure in No. 8 Coal.Coal Science and Technology, 52(6): 142-154 (in Chinese with English abstract). |
| [35] |
Zhao, Z., Xu, W. L., Zhao, Z. Y., et al., 2024. Geological Characteristics and Exploration Breakthroughs of Coal Rock Gas in Carboniferous Benxi Formation, Ordos Basin, NW China.Petroleum Exploration and Development, 51(2): 234-247, 259 (in Chinese with English abstract). |
| [36] |
Zhou, L. H., Xiong, X. Y., Ding, R., et al., 2025a. Connotation, Enrichment Mechanism and Practical Significance of Coal⁃Rock Gas.Natural Gas Industry, 45(3): 1-15 (in Chinese with English abstract). |
| [37] |
Zhou, L. H., Li, Y., Ding, R., et al., 2025b. Differential Accumulation Characteristics and Production of Coalbed Methane/Coal⁃Rock Gas: A Case Study of the No. 8 Coal Seam of the Carboniferous Benxi Formation in the Daji Block, Ordos Basin, NW China. Petroleum Exploration and Development, 52(4): 772-781 (in Chinese with English abstract). |
| [38] |
Zhou, L. H., Li, S. G., Wang, Y., et al., 2025c. Key Technologies and Practices for Cost⁃Effective Development of Deep Coal⁃Rock Gas: A Case Study of the Daning⁃Jixian Block in Ordos Basin. Acta Petrolei Sinica, 46(8): 1536-1549 (in Chinese with English abstract). |
国家科技重大专项项目(2025ZD1405700)
中石油煤层气有限责任公司科技项目(2026⁃KJ⁃0101)
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