Insights into the Tectonic Fractures in the Yanchang Formation Interbedded Sandstone-Mudstone of the Ordos Basin Based on Core Data and Geomechanical Models
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We would like to express our gratitude to Prof. Aydin, Prof. Zhou Xingui and the anonymous reviewers for offering constructive comments which greatly improved this manuscript. Many thanks are given to Prof. Hari of Pt. Ravishankar Shukla University for revising and polishing this manuscript. Thanks are also due to Zhao Wentao, Zhan Yan and Yu Xuan from Peking University for offering great help in field investigations and geomechanical modeling, and Feng Shengbin and Zhang Juzeng from Institute of Petroleum Exploration and Development, Changqing Oilfield Company for some useful geological data. This study is financially supported by the Fundamental Research Funds for the Central Universities (No. 2015QNA69), the State Key Laboratory of Continental Tectonics and Dynamics (No. K201406) and the PetroChina Major Science and Technology Project (No. 2011E-2602).


Insights into the Tectonic Fractures in the Yanchang Formation Interbedded Sandstone-Mudstone of the Ordos Basin Based on Core Data and Geomechanical Models
Author:
  • JU Wei

    JU Wei

    1 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education; School of Resources and Geoscience, China University of Mining and Technology, Xuzhou 221116,Jiangsu, China;2 School of Earth and Space Science, Peking University, Beijing 100871, China;3 The State Key Laboratory of Continental Tectonics and Dynamics; Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;
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  • SUN Weifeng

    SUN Weifeng

    1 Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education; School of Resources and Geoscience, China University of Mining and Technology, Xuzhou 221116,Jiangsu, China;4 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
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  • HOU Guiting

    HOU Guiting

    2 School of Earth and Space Science, Peking University, Beijing 100871, China
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Fund Project:

We would like to express our gratitude to Prof. Aydin, Prof. Zhou Xingui and the anonymous reviewers for offering constructive comments which greatly improved this manuscript. Many thanks are given to Prof. Hari of Pt. Ravishankar Shukla University for revising and polishing this manuscript. Thanks are also due to Zhao Wentao, Zhan Yan and Yu Xuan from Peking University for offering great help in field investigations and geomechanical modeling, and Feng Shengbin and Zhang Juzeng from Institute of Petroleum Exploration and Development, Changqing Oilfield Company for some useful geological data. This study is financially supported by the Fundamental Research Funds for the Central Universities (No. 2015QNA69), the State Key Laboratory of Continental Tectonics and Dynamics (No. K201406) and the PetroChina Major Science and Technology Project (No. 2011E-2602).

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    摘要:

    The distribution and intensity of tectonic fractures within geologic units are important to hydrocarbon exploration and development. Taken the Upper Triassic Yanchang Formation interbedded sandstone-mudstone in the Ordos Basin as an example, this study used the finite element method (FEM) based on geomechanical models to study the development of tectonic fractures. The results show that the sandstones tend to generate tectonic fractures more easily than mudstones with the same layer thickness, and the highest degree of tectonic fractures will be developed when the sandstone-mudstone thickness ratio is about 5.0. A possible explanation is proposed for the tectonic fracture development based on two important factors of rock brittleness and mechanical layer thickness. Generally, larger rock brittleness and thinner layer thickness will generate more tectonic fractures. In interbedded sandstone-mudstone formations, the rock brittleness increases with the increasing mechanical layer thickness, hence, these two factors will achieve a balance for the development of tectonic fractures when the sandstone-mudstone thickness ratio reaches a specific value, and the development degree of tectonic fractures is the highest at this value.

    Abstract:

    The distribution and intensity of tectonic fractures within geologic units are important to hydrocarbon exploration and development. Taken the Upper Triassic Yanchang Formation interbedded sandstone-mudstone in the Ordos Basin as an example, this study used the finite element method (FEM) based on geomechanical models to study the development of tectonic fractures. The results show that the sandstones tend to generate tectonic fractures more easily than mudstones with the same layer thickness, and the highest degree of tectonic fractures will be developed when the sandstone-mudstone thickness ratio is about 5.0. A possible explanation is proposed for the tectonic fracture development based on two important factors of rock brittleness and mechanical layer thickness. Generally, larger rock brittleness and thinner layer thickness will generate more tectonic fractures. In interbedded sandstone-mudstone formations, the rock brittleness increases with the increasing mechanical layer thickness, hence, these two factors will achieve a balance for the development of tectonic fractures when the sandstone-mudstone thickness ratio reaches a specific value, and the development degree of tectonic fractures is the highest at this value.

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JU Wei, SUN Weifeng, HOU Guiting.2015. Insights into the Tectonic Fractures in the Yanchang Formation Interbedded Sandstone-Mudstone of the Ordos Basin Based on Core Data and Geomechanical Models[J]. ACTA GEOLOGICA SINICA(English edition),89(6):1986~1997

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  • 收稿日期:2014-11-04
  • 最后修改日期:2015-05-11
  • 在线发布日期: 2015-12-16
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